December in Hawaii typically marks the beginning of the wetter season and the arrival of winter swells. Temperatures are generally mild, ranging from the mid-70s to low 80s Fahrenheit (low- to mid-20s Celsius) during the day and dipping into the 60s Fahrenheit (mid-teens Celsius) at night. Rainfall varies considerably across the islands, with some areas experiencing significantly more precipitation than others. Ocean conditions can become rougher, particularly on north-facing shores, due to the large waves generated by winter storms in the North Pacific.
Understanding typical Hawaiian weather patterns during this month allows travelers to prepare appropriately for their trip. This knowledge facilitates informed decisions about packing, activity planning, and island selection. Historically, December has been a popular time to visit Hawaii for surfing enthusiasts seeking larger waves. Awareness of the prevailing conditions also allows visitors to maximize their enjoyment of outdoor activities and minimize potential disruptions caused by inclement weather.
The following sections will explore the specific weather patterns experienced across each of the main Hawaiian Islands during December, offering a detailed look at average temperatures, rainfall, and ocean conditions. Additional information will be provided regarding the impact of these conditions on popular tourist activities and recommendations for appropriate attire and gear.
1. Mild Temperatures
Mild temperatures characterize December weather in Hawaii, distinguishing it from colder continental climates. While mainland locations might experience freezing temperatures and snowfall, Hawaii maintains average daytime highs in the 70s and low 80s Fahrenheit (low to mid-20s Celsius). This relative warmth stems from Hawaii’s tropical location and the moderating influence of the Pacific Ocean. The ocean’s thermal inertia prevents extreme temperature fluctuations, resulting in comfortable conditions throughout the month. For instance, while a location like Chicago might experience daytime highs in the 30s Fahrenheit (around freezing) in December, Honolulu typically enjoys highs in the upper 70s Fahrenheit (mid-20s Celsius). This difference highlights the significance of mild temperatures in shaping the overall December weather experience in Hawaii.
This mild weather allows for a range of outdoor activities throughout December. Swimming, snorkeling, hiking, and other pursuits remain comfortable options, unlike colder climates where such activities are often restricted during winter months. Furthermore, the moderate temperatures contribute to a pleasant atmosphere for evening activities, allowing visitors to enjoy outdoor dining or stargazing without needing heavy winter clothing. The absence of extreme cold also reduces energy consumption for heating, offering both economic and environmental benefits.
The consistently mild temperatures in Hawaii during December play a crucial role in defining the islands’ appeal as a winter destination. This characteristic, combined with other factors like varied landscapes and unique cultural experiences, contributes significantly to Hawaii’s tourism industry during this period. Understanding the role of mild temperatures allows travelers to appreciate the distinct advantages of visiting Hawaii in December and to plan accordingly for a comfortable and enjoyable experience. However, it is important to acknowledge the microclimates within the islands; higher elevations can experience cooler temperatures, requiring visitors to pack layers for varying conditions.
2. Increased Rainfall
Increased rainfall significantly influences Hawaiian weather in December. This rise in precipitation marks the transition from the drier summer months to the wetter winter season. The shift results from changing atmospheric circulation patterns, including the southward migration of the jet stream and the increased frequency of Kona storms. These storms, characterized by southerly winds, bring moisture-laden air from the equatorial Pacific, resulting in periods of prolonged and often heavy rainfall. The effect is particularly pronounced on windward slopes, exposed to the prevailing trade winds, which force moisture-rich air upwards, leading to condensation and precipitation. For example, the Klauea Ranger Station in Hawaii Volcanoes National Park, located on the windward side of the Big Island, averages over 10 inches of rain in December, significantly higher than summer months.
Understanding the likelihood of increased rainfall is crucial for planning December trips to Hawaii. This awareness enables travelers to pack appropriately, considering rain gear like waterproof jackets and umbrellas. Furthermore, recognizing the regional variation in rainfall allows for informed island selection. Kauai, known for its lush rainforests, experiences considerably higher rainfall than leeward areas of other islands. Consequently, visitors seeking drier conditions might opt for locations like the Kohala Coast on the Big Island. Moreover, increased rainfall can impact outdoor activities. Hiking trails may become muddy and slippery, and ocean conditions can be affected by runoff, potentially impacting visibility for snorkeling and diving. Being prepared for such eventualities allows visitors to adapt itineraries and still enjoy their trip despite potential rain showers.
In summary, increased rainfall is a defining characteristic of Hawaiian weather in December. Recognizing its influence, understanding the underlying meteorological causes, and considering the practical implications are essential for anyone planning a trip to the islands during this time. While rain can occasionally disrupt planned activities, it also contributes to the islands’ lush vegetation and replenishes freshwater resources. Ultimately, awareness of increased rainfall empowers travelers to make informed decisions, enhancing their ability to enjoy the unique beauty and diverse experiences Hawaii offers, even during the wetter winter months.
3. Higher Humidity
Higher humidity is a hallmark of December weather in Hawaii, directly linked to the increased rainfall characteristic of the season. The abundance of moisture in the atmosphere, driven by the prevailing trade winds and the occasional Kona storm, contributes to a perceptible rise in humidity levels. This elevated humidity distinguishes December from the drier summer months, creating a unique atmospheric condition that visitors should be prepared for. The increased moisture content in the air can lead to a feeling of stickiness and can make physical exertion feel more strenuous. For example, a leisurely hike during December might feel more demanding due to the higher humidity compared to the same hike undertaken during a drier month. Understanding this distinction allows for realistic expectations regarding physical activity and the need for increased hydration.
The practical implications of higher humidity extend beyond perceived exertion levels. It influences clothing choices, encouraging breathable fabrics like linen and cotton over synthetic materials that can trap moisture and increase discomfort. Higher humidity also necessitates greater attention to hydration. Perspiration evaporates less readily in humid conditions, potentially leading to dehydration more quickly than in drier climates. Carrying water and replenishing fluids regularly becomes paramount, especially during outdoor activities. Furthermore, higher humidity can affect individuals with respiratory conditions, potentially exacerbating symptoms. Awareness of this factor allows travelers to take necessary precautions and consult with healthcare professionals before traveling if needed.
In summary, higher humidity constitutes an integral component of December weather in Hawaii. Its connection to increased rainfall and its practical implications for comfort, activity levels, and health considerations are crucial aspects for travelers to understand. Acknowledging this characteristic allows for informed preparation, including appropriate clothing choices, hydration strategies, and health management. While higher humidity might present some challenges, it contributes to the lush landscapes that define Hawaii’s beauty. By understanding its influence, visitors can better appreciate the nuances of Hawaiian weather in December and enjoy a fulfilling experience despite the potential challenges of increased moisture in the air.
4. Stronger Trade Winds
Stronger trade winds are a defining characteristic of Hawaiian weather in December, influencing various aspects of the islands’ climate during this period. These winds, originating from the northeast, typically intensify during the winter months, shaping precipitation patterns, ocean conditions, and overall atmospheric dynamics. Understanding their influence is essential for comprehending December’s weather patterns and preparing for a visit to Hawaii.
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Enhanced Rainfall on Windward Slopes
Stronger trade winds force moisture-laden air upwards against the volcanic slopes of the islands, particularly on windward (northeastern) sides. This orographic lift causes the air to cool and condense, resulting in increased rainfall. Locations like the windward sides of Kauai and Maui experience significantly higher precipitation levels in December due to this phenomenon. This localized rainfall contributes to the lush vegetation and dramatic waterfalls that characterize these areas, but can also impact outdoor activities.
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Choppy Seas and Larger Waves on North Shores
The intensified trade winds generate larger waves and choppier seas, especially on the north-facing shores exposed to their full force. This makes December a popular time for experienced surfers seeking challenging conditions. However, these rougher waters can also pose hazards for swimming and other water activities, necessitating caution and awareness of local advisories. The impact on marine life can also be significant, affecting the distribution and behavior of certain species.
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Wind-Sheltered Conditions on Leeward Sides
While windward sides experience increased rainfall and rougher seas, the leeward (southwestern) sides of the islands are often sheltered from the direct impact of the trade winds. This creates calmer ocean conditions and drier weather, offering more favorable environments for swimming, snorkeling, and other water-based activities. The contrast between windward and leeward conditions underscores the importance of understanding trade wind influences when choosing a location within the Hawaiian Islands during December.
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Influence on Temperature and Humidity
While not the primary determinant of temperature, stronger trade winds contribute to a moderating effect, preventing excessive heat buildup. They also influence humidity levels, depending on the origin and trajectory of the air mass. Drier trade winds can lower humidity, while those carrying moisture from the ocean can contribute to higher humidity levels. This complex interplay highlights the dynamic nature of trade wind influences on the overall weather experience.
In conclusion, stronger trade winds play a pivotal role in shaping Hawaiian weather in December. Their influence on rainfall distribution, ocean conditions, and temperature and humidity levels contributes significantly to the diverse microclimates across the islands. Understanding these influences enables visitors to make informed decisions regarding location selection, activity planning, and necessary preparations for a safe and enjoyable experience during their December trip to Hawaii.
5. Larger swells (north shores)
Larger swells characterize North Shore weather in Hawaii during December, directly linked to the prevailing winter weather patterns in the North Pacific. These swells originate from powerful extratropical cyclones, often thousands of miles away, generating waves that propagate southward towards the Hawaiian Islands. The North Shore’s unique bathymetry, featuring shallow reefs and underwater canyons, amplifies these swells, resulting in the dramatic, towering waves renowned in the surfing world. This phenomenon distinguishes December from other months, transforming the North Shore into a global surfing mecca. For instance, the legendary surf breaks of Waimea Bay and Pipeline come alive during this period, attracting professional surfers and spectators alike for iconic competitions like The Eddie Aikau Big Wave Invitational, held only when waves consistently reach heights of 20 feet or more. This spectacle underscores the direct connection between December’s weather patterns and the North Shore’s unique surf conditions.
The influx of large swells significantly impacts maritime activities and coastal safety. Swimming and other water activities become hazardous along the North Shore during December, restricted to experienced surfers and watercraft operators. Coastal erosion also intensifies due to the powerful wave action, reshaping beaches and potentially impacting coastal infrastructure. Understanding the dynamics of these swells allows for informed decision-making regarding coastal activities and safety precautions. Lifeguard warnings become crucial, and respecting ocean conditions is paramount. Furthermore, the large swells impact marine ecosystems, influencing the distribution of marine life and creating dynamic nearshore environments. Recognizing these broader ecological effects contributes to a comprehensive understanding of the role of large swells in shaping the North Shore’s December environment.
In summary, larger swells are an integral component of North Shore weather in Hawaii during December. Driven by distant North Pacific storms and amplified by local bathymetry, these swells create both spectacular surfing opportunities and significant coastal hazards. Understanding their origin, their influence on coastal dynamics, and the practical implications for safety and marine ecosystems provides valuable insights into the unique characteristics of North Shore weather in December. This knowledge empowers both residents and visitors to appreciate the power of the ocean and to engage responsibly with the dynamic environment that defines this special region during the winter months.
6. Whale Watching Season
Whale watching season in Hawaii coincides with the December weather patterns, creating a significant intersection between the islands’ meteorological conditions and a remarkable biological phenomenon. Humpback whales migrate from their Alaskan feeding grounds to the warmer Hawaiian waters for breeding and calving during the winter months, with peak season typically occurring from December to May. The relatively calm and warm waters surrounding the islands in December, particularly in the sheltered channels between islands, provide ideal conditions for these whales to mate, give birth, and nurse their young. This period of milder seas, influenced by the subsiding trade winds in certain areas, creates a favorable environment for whale activity, enhancing the opportunities for observation and study. For example, the Auau Channel between Maui, Lanai, and Molokai becomes a prime location for whale watching tours during December due to the calmer waters and high concentration of whales.
The connection between whale watching season and December weather extends beyond simply providing favorable conditions. The predictable nature of Hawaiian weather during this time allows for the reliable operation of whale watching tours. The generally clear skies and moderate seas increase the likelihood of successful sightings. Furthermore, the accessibility of warmer waters close to shore, influenced by Decembers ocean currents, brings the whales within closer proximity to viewing points, enhancing the overall experience. This accessibility contributes significantly to the economic importance of whale watching tourism in Hawaii, supporting local businesses and promoting conservation efforts. The increased awareness of whale behavior and their reliance on specific environmental conditions generated by this tourism fosters a deeper understanding of the interconnectedness between weather patterns and marine ecosystems.
In summary, the concurrence of whale watching season with December’s weather patterns in Hawaii represents a significant ecological and economic convergence. The mild seas, calmer channels, and relatively predictable weather create optimal conditions for whale activity and observation. This interplay underscores the importance of understanding weather patterns not only for planning human activities but also for appreciating their influence on crucial biological cycles within the marine environment. Recognizing this connection fosters a deeper appreciation for the delicate balance within Hawaiian ecosystems and highlights the importance of responsible tourism and conservation efforts to protect these magnificent creatures and their habitat.
7. Variable Sunshine
Variable sunshine is a key characteristic of Hawaiian weather in December, adding complexity to the overall climatic picture. While the islands are generally associated with abundant sunshine, December’s weather patterns introduce a degree of unpredictability. The increased presence of clouds and rainfall associated with the wetter season contributes to fluctuating periods of sunshine and overcast conditions. This variability stems from the interplay of several meteorological factors, including the shifting position of the Intertropical Convergence Zone (ITCZ), the strength and direction of trade winds, and the occasional passage of Kona storms. These systems influence cloud formation and movement, resulting in a dynamic pattern of sunshine distribution across the islands. For instance, while one side of an island might experience bright sunshine, another side could be shrouded in cloud cover and receiving rainfall simultaneously. This localized variability underscores the importance of understanding the dynamic nature of December’s weather patterns.
The practical implications of variable sunshine are significant for travelers planning December trips to Hawaii. Packing for a range of conditions, including both sunny and cloudy weather, becomes essential. Light clothing suitable for warm, sunny periods should be complemented by layers for cooler, overcast days. Furthermore, recognizing the potential for sudden rain showers necessitates the inclusion of rain gear. Flexibility in itinerary planning also becomes crucial. Outdoor activities dependent on sunshine, such as sunbathing or certain water sports, might need to be adjusted based on prevailing conditions. Utilizing weather forecasts and local observations becomes valuable for making informed decisions about daily activities. Awareness of microclimates within the islands also becomes important. Leeward sides generally experience more sunshine than windward areas, offering an alternative for those seeking sunnier conditions. For example, the Kohala Coast of the Big Island tends to be drier and sunnier than Hilo on the windward side, providing options for travelers seeking specific weather conditions.
In summary, variable sunshine adds a layer of complexity to understanding Hawaiian weather in December. The interplay of various atmospheric systems generates a dynamic pattern of sunshine distribution across the islands, requiring travelers to be prepared for fluctuating conditions. Packing appropriately, incorporating flexibility into itineraries, and utilizing weather information become crucial strategies for navigating this variability and maximizing enjoyment of a December trip to Hawaii. Recognizing the interplay between sunshine, cloud cover, and rainfall contributes to a more nuanced understanding of Hawaiian weather during this period and empowers travelers to make informed decisions for a fulfilling experience.
8. Cooler Evenings
Cooler evenings are a notable feature of Hawaiian weather in December, distinguishing this period from the warmer nights of summer months. This shift results from decreased solar radiation during shorter winter days and the influence of cooler air masses arriving from higher latitudes. While daytime temperatures remain relatively mild, the reduced solar heating allows for more significant radiative cooling overnight, leading to lower evening temperatures. This change is particularly noticeable in higher elevation areas, where temperatures can drop significantly after sunset. For instance, while coastal areas might experience evening lows in the mid-60s Fahrenheit (high teens Celsius), locations like Volcano Village on the Big Island could see temperatures dip into the 50s Fahrenheit (low teens Celsius). This contrast highlights the influence of elevation on the degree of evening cooling.
The practical significance of cooler evenings in December influences clothing choices and activity planning. Packing layers becomes essential, allowing for adjustments to fluctuating temperatures between day and night. Light jackets, sweaters, or long-sleeved shirts provide comfort during cooler evenings, especially when engaging in outdoor activities. Stargazing, evening hikes, or outdoor dining become more enjoyable with appropriate attire. Furthermore, understanding the potential for cooler temperatures allows for informed accommodation choices. Visitors sensitive to cooler temperatures might opt for lodgings with heating options or consider lower elevation accommodations for milder evening conditions. The awareness of cooler evenings contributes to a more comfortable and enjoyable experience, enabling visitors to adapt to the specific weather conditions characteristic of December in Hawaii.
In summary, cooler evenings represent a distinct aspect of Hawaiian weather in December. The reduced solar radiation and influence of cooler air masses contribute to lower temperatures after sunset, particularly in higher elevation areas. This shift necessitates practical adjustments in clothing choices and activity planning. Packing layers, considering accommodation options, and anticipating the need for warmer attire during evening hours contribute to a more comfortable and informed travel experience during December in Hawaii. Recognizing the distinction between daytime and evening temperatures allows visitors to fully appreciate the nuances of Hawaiian weather during this period and to prepare accordingly for a more enjoyable and fulfilling visit.
Frequently Asked Questions about Hawaiian Weather in December
This section addresses common inquiries regarding Hawaiian weather in December, providing concise and informative responses to facilitate informed travel planning.
Question 1: How much does it rain in Hawaii during December?
Rainfall varies significantly across the islands and even within different regions of the same island. Windward areas generally experience higher rainfall than leeward sides. Average December rainfall can range from a few inches in leeward coastal regions to over 10 inches in mountainous windward areas.
Question 2: Is December a good time to visit Hawaii?
December offers a unique experience with mild temperatures, whale watching opportunities, and vibrant holiday festivities. However, the increased likelihood of rain and rougher seas on north-facing shores requires careful consideration of individual preferences and planned activities.
Question 3: What should I pack for a trip to Hawaii in December?
Packing layers is essential, including light clothing for warm days, sweaters or light jackets for cooler evenings, and rain gear for potential showers. Swimwear, comfortable walking shoes, and sunscreen are also recommended.
Question 4: Are the beaches in Hawaii swimmable in December?
Most beaches remain swimmable in December, particularly those on leeward, south-facing shores. However, north-facing shores experience larger waves and stronger currents during this time, posing hazards for inexperienced swimmers.
Question 5: What are typical December temperatures in Hawaii?
Daytime temperatures typically range from the mid-70s to low 80s Fahrenheit (low to mid-20s Celsius), while evenings are cooler, often dipping into the 60s Fahrenheit (mid-teens Celsius), especially at higher elevations.
Question 6: How does December weather impact outdoor activities in Hawaii?
While most outdoor activities remain feasible, rain can occasionally disrupt plans. Hikers should be prepared for muddy trails, and water activities might be impacted by reduced visibility or rougher seas. Flexibility and alternative plans are recommended.
Careful consideration of these factors allows for realistic expectations and informed decision-making for a December trip to Hawaii. Understanding the nuances of Hawaiian weather during this period empowers travelers to prepare adequately and maximize their enjoyment of the islands.
The following section will offer specific recommendations for activities and destinations within each Hawaiian Island, tailored to the typical December weather conditions.
Tips for Navigating Hawaiian Weather in December
These tips offer practical guidance for travelers preparing for December conditions in Hawaii, enabling informed decisions and enhancing the overall travel experience.
Tip 1: Pack for Varied Conditions: Luggage should accommodate both warm, sunny days and cooler evenings, including light clothing, layers for warmth, and rain gear. A versatile wardrobe maximizes comfort and preparedness for fluctuating conditions.
Tip 2: Monitor Weather Forecasts: Regularly checking weather forecasts before and during travel allows for adjustments to itineraries based on prevailing conditions. Awareness of potential rain showers or changing surf conditions enhances safety and enjoyment.
Tip 3: Embrace Flexibility: Maintaining flexible travel plans allows for adaptation to unpredictable weather patterns. Alternative activities or destinations can be explored if initial plans are disrupted by rain or other weather events.
Tip 4: Choose Accommodation Wisely: Considering the potential for cooler evenings and increased rainfall influences accommodation choices. Higher elevation locations might necessitate accommodations with heating, while proximity to sheltered beaches enhances options for water activities.
Tip 5: Research Island-Specific Microclimates: Understanding the varying microclimates across the Hawaiian Islands facilitates informed destination selection. Leeward sides generally offer drier and sunnier conditions compared to windward areas, catering to diverse weather preferences.
Tip 6: Prioritize Hydration: Higher humidity levels in December increase the risk of dehydration. Carrying water and replenishing fluids regularly, especially during outdoor activities, is crucial for maintaining well-being.
Tip 7: Respect Ocean Conditions: Heeding lifeguard warnings and exercising caution near the ocean is paramount, especially on north-facing shores exposed to larger swells during December. Understanding ocean safety guidelines ensures a safe and enjoyable coastal experience.
Tip 8: Pack Reef-Safe Sunscreen: Protecting skin from the sun while minimizing environmental impact is essential. Utilizing reef-safe sunscreen safeguards both personal health and the delicate coral reef ecosystems.
Adherence to these guidelines promotes informed decision-making, mitigates potential weather-related disruptions, and enhances the overall travel experience in Hawaii during December.
The following conclusion synthesizes key insights into Hawaiian weather in December and offers final recommendations for a fulfilling trip.
Understanding Hawaii’s December Weather
December in Hawaii presents a unique blend of meteorological conditions. Mild temperatures prevail, yet increased rainfall, higher humidity, and stronger trade winds mark the transition to the wetter season. North-facing shores experience larger swells, attracting surfers, while calmer waters persist on leeward sides. This period coincides with the arrival of humpback whales, offering remarkable whale watching opportunities. Variable sunshine necessitates preparedness for both sunny and cloudy conditions, and cooler evenings require appropriate attire. Comprehending these diverse elements provides a comprehensive understanding of December’s weather profile in Hawaii.
Planning a December trip to Hawaii requires careful consideration of these multifaceted weather dynamics. Informed preparation, including appropriate attire, flexible itineraries, and awareness of island-specific microclimates, allows travelers to navigate the variable conditions and maximize enjoyment. Recognizing the interplay of these factors enhances appreciation for the dynamic forces shaping Hawaii’s unique December environment and contributes to a more fulfilling travel experience.
