What is Hawaii Weather in December offers a glimpse into the tropical paradise’s climate during the month of December. With high-pressure systems dominating the weather patterns, Hawaii’s temperature, humidity, and precipitation levels are influenced in unique ways. From rain showers to beautiful sunshine, this topic delves into the specifics of Hawaii’s weather in December.
The Hawaiian Islands experience a mild climate in December, with temperatures ranging from the mid-70s to low 80s Fahrenheit. The humidity levels are relatively high, especially during the early morning hours. The lush vegetation and tropical flowers thrive in this climate, adding to the islands’ natural beauty.
General Weather Patterns in December for the Hawaiian Islands
Throughout December, the Hawaiian Islands experience a distinct dry season, characterized by relatively stable atmospheric conditions. This period is significantly influenced by high-pressure systems that dominate the region, leading to a decrease in precipitation and an increase in temperatures.
Prevailing High-Pressure Systems
The Hawaiian Islands are primarily affected by the subtropical high-pressure belt, situated to the north and east of the islands, and the trade wind inversion layer, which forms an anticyclonic circulation that reinforces the high pressure. These systems have a profound impact on the temperature, humidity, and precipitation patterns in the region.
- The subtropical high-pressure belt, which encompasses the Hawaiian Islands during December, brings about a temperature increase due to the compression and warming of air as it sinks. This results in highs ranging between 77°F and 85°F (25°C and 29°C), while lows range between 68°F and 78°F (20°C and 25°C).
- The trade wind inversion layer, a phenomenon created by the temperature and humidity differences between the dry air aloft and cooler moist air at the surface, plays a significant role in shaping the regional climate. It produces a stable atmospheric condition, characterized by minimal cloud cover and precipitation, allowing for clear skies and warm temperatures.
- These high-pressure systems also have a profound effect on humidity levels, causing a decrease in relative humidity during the day as the air is compressed and warmed by the sinking motion. At night, however, relative humidity increases due to the cooling of the air, leading to occasional mist or fog formation.
Types of Weather Events
The combination of high-pressure systems and trade winds during December gives rise to various weather events that are characteristic of this period. Some of these events include:
- Clear Spells and Warm Temperatures: The stable atmospheric conditions prevailing in December lead to prolonged clear spells, allowing temperatures to rise significantly. This creates an ideal climate for outdoor activities like hiking, surfing, and beach visits.
- Fog and Mist: As mentioned earlier, the cooling of the air at night leads to the formation of mist or fog, particularly in the valleys and mountainous regions. This can affect local visibility, impacting air and sea travel.
- Short-Lived Storms: Although the high-pressure systems dominate the region, short-lived and weak storms may still occur due to the interaction with low-pressure systems or disturbances from the tropics. These storms are often characterized by heavy precipitation and strong winds, but they are relatively rare during December.
According to the National Weather Service (NWS), the statewide average temperature for December is around 70°F (21°C), with a minimum of 18 inches (457 mm) of rainfall along the windward slopes.
The combination of high-pressure systems and trade winds in December creates a unique set of weather patterns that shape the climate of the Hawaiian Islands. These patterns have a significant impact on the temperature, humidity, and precipitation levels, making December an ideal time for outdoor activities and enjoying the tropical climate of the islands.
Temperature and Humidity in December
Temperature and humidity levels in Hawaii in December are characterized by mild temperatures and relatively high humidity, especially in the mornings and evenings. The tropical climate of the islands allows for a wide range of vegetation to thrive, from tropical flowers to lush rainforests, and the diverse temperature and humidity conditions support various types of plant growth throughout the year.
Variation in Temperature Across Islands
The temperature in December ranges across the different islands, with some experiencing warmer temperatures than others. The warmest temperatures are found on the island of Oahu, with average highs of around 78°F (25°C) and lows of 63°F (17°C). Maui and Kauai also experience relatively warm temperatures, with average highs of around 75°F (24°C) and lows of 63°F (17°C). In contrast, the Big Island and Molokai tend to be cooler, with average highs of around 70°F (21°C) and lows of 58°F (14°C). Hilo, a coastal town on the Big Island, experiences a subtropical climate, with temperatures ranging from around 65°F (18°C) to 80°F (27°C) throughout the year.
Humidity Levels During Different Times of the Day
The humidity levels in Hawaii in December are relatively high, ranging from around 60% to 90% throughout the day. The highest humidity levels are typically found in the mornings and evenings, while the lowest levels are found during the late afternoon and early evening hours. For instance, in Honolulu, the humidity levels range from around 70% in the morning to 40% in the late afternoon. In contrast, the rainforests of Kauai experience almost constant high humidity levels throughout the day, often above 90%.
Tropical Vegetation
The diverse temperature and humidity conditions in Hawaii support the growth of various types of tropical vegetation. The islands are home to a wide range of plant species, including tropical flowers, palm trees, and ferns. Hala trees (Pandanus spp.) are commonly found along coastlines and in coastal wetlands, while ma’o hau hele (Yellow Hibiscus, Hibiscus brackenridgei) and koa trees (Acacia koa) are found in various parts of the islands. The rainforests of Kauai and the Big Island are home to a variety of plant species, including the famous Kukui tree (Aleurites moluccana), an evergreen tree that is native to Hawaii. The tropical vegetation in Hawaii is often characterized by its bright colors, vibrant flowers, and lush foliage, creating a unique and beautiful landscape throughout the year.
Precipitation and Storm Systems
In December, the Hawaiian Islands experience a significant increase in precipitation due to the holiday season storm systems. These systems bring heavy rain showers, strong winds, and rough surf, impacting the islands’ weather patterns.
During the month of December, the trade winds and high-pressure systems play a crucial role in shaping the precipitation events in the Hawaiian Islands. The trade winds, blowing from the northeast, bring moisture from the tropics, which leads to an increase in rainfall. On the other hand, high-pressure systems near the islands suppress the development of low-pressure systems, allowing for a prolonged period of heavy rainfall.
Average Rainfall and Notable Storms
The average rainfall in December varies across the Hawaiian Islands, with the Koolau mountain range on the island of Oahu receiving the most rain, while the island of Lanai receives the least. Here’s a breakdown of the average rainfall and notable storms for each island in December.
| Island Name | Average Rainfall in December (inches) | Notable Storms |
| — | — | — |
| Oahu | 8.23 | December 1st-3rd: Heavy rain showers and strong winds affected the island, causing flash flooding and power outages. |
| Maui | 5.51 | December 10th-12th: A strong low-pressure system brought heavy rain, strong winds, and rough surf, impacting the island’s coastal areas. |
| Kauai | 7.14 | December 20th-22nd: Moisture from a low-pressure system led to heavy rain and flooding in the island’s northern region. |
| Hawaii Island | 6.22 | December 15th-17th: A strong trade wind event brought heavy rain and gusty winds, causing power outages and flash flooding in the island’s southern region. |
| Lanai | 4.12 | December 25th-27th: A weak low-pressure system brought light rain showers and gentle winds, impacting the island’s coastal areas. |
The Impact of Precipitation Events
The precipitation events in December have a significant impact on the Hawaiian Islands, particularly on the agriculture, tourism, and infrastructure sectors. Heavy rainfall can lead to flash flooding, landslides, and soil erosion, impacting the island’s economy and residents. Strong winds can also cause power outages, damage buildings, and disrupt communication services.
Wind and Wave Patterns
The prevailing wind direction and speed play a significant role in shaping the ocean waves and surf conditions in the Hawaiian Islands during December. The wind patterns influence the wave heights, wave periods, and the overall surf climate, making it essential to understand these dynamics for planning and participating in water activities.
Prevailing Wind Direction and Speed
During December, the prevailing wind direction in the Hawaiian Islands is from the north to northeast, bringing warm, moist air from the subtropics. This wind direction is influenced by the trade winds, which prevail over the Pacific Ocean during the winter months. The average wind speed during this period ranges from 10 to 20 mph (16 to 32 km/h), with occasional gusts reaching up to 30 mph (48 km/h).
Ocean Waves and Surf Conditions
The wind-driven waves and swells in the Hawaiian Islands during December create a unique surf climate. The north to northeast winds generate waves that are typically medium to high in height, with wave periods ranging from 8 to 12 seconds. This creates a dynamic surf environment, with various surf spots presenting opportunities for different skill levels and preferences.
| Island Name | Average Wind Speed (mph) | Surf Conditions |
|---|---|---|
| Oahu | 12-18 | Medium to high waves, suitable for intermediate to advanced surfers |
| Maui | 10-15 | Medium waves, ideal for beginners and intermediate surfers |
| Kauai | 15-20 | High waves, challenging for experienced surfers |
| Hawai’i Island | 12-18 | Medium to high waves, suitable for intermediate to advanced surfers |
| Big Island (East Coast) | 10-15 | Medium waves, ideal for beginners and intermediate surfers |
Impact of December Weather on Island Activities
December marks the start of the wet season in Hawaii, but that doesn’t mean you can’t enjoy the beautiful islands. The weather may be a bit unpredictable, but locals and tourists alike adapt to the changing conditions. This article will explore the impact of December weather on popular island activities like surfing, hiking, and tourism.
Surfing in Hawaii, What is hawaii weather in december
December is a great time for surfers to hit the beaches in Hawaii. The winter months bring larger swells, making for better surfing conditions. However, the rain and higher winds can make it challenging to hit the beach. Locals have adapted to this by using reef breaks, which are less affected by the rain and wind. These breaks offer consistent and fun waves, making December a great time for surfers to visit the islands.
Hiking and Outdoor Activities
Hiking in Hawaii can be a bit more challenging in December due to the rain and muddy trails. However, the lush green scenery and blooming flowers make it a unique and rewarding experience. Locals and tourists alike use rain gear and sturdy footwear to tackle the trails. Many parks and hiking areas have designated routes to avoid flooded areas, making it possible to enjoy the beautiful scenery while staying safe.
Tourism and Events
Tourism in Hawaii is not affected by the December weather. Many events and festivals take place during this time, such as the Honolulu City Lights festival, which features decorated shops, restaurants, and homes. The weather may be a bit unpredictable, but the festive atmosphere and warm Hawaiian hospitality make it a great time to visit the islands.
Recommended Island Activities for December
If you’re planning to visit Hawaii in December, here are some recommended island activities to enjoy:
- Surfing: Take advantage of the larger swells and hit the reef breaks on the North Shore.
- Hiking: Explore the lush green scenery and blooming flowers in areas like Manoa Falls or Nuuanu Pali.
- Tourism: Visit the Waikiki Beach for the festive atmosphere and try some delicious local cuisine.
- Volcano Adventures: Take a guided tour to explore the active volcano Kilauea and its surroundings.
- Festivals and Events: Attend the Honolulu City Lights festival or try some local cuisine at the Kona Coffee Festival.
Safety Tips
When visiting Hawaii in December, be sure to check the weather forecast before heading out and plan accordingly. Bring rain gear and sturdy footwear to ensure a safe and enjoyable experience. Additionally, check with local authorities for any trail closures or advisories before heading out to hike.
Carefully plan your activities and accommodations to ensure a smooth and enjoyable trip to Hawaii.
Image Description
Imagine a picturesque beach on the North Shore, with palm trees swaying in the wind and the sound of crashing waves in the background. The sun is setting over the horizon, casting a warm golden light over the scene. Locals and tourists alike are surfing and soaking up the atmosphere, enjoying the festive feeling that comes with the holiday season.
Additional Tips
Be sure to check the weather forecast and plan your activities accordingly. Bring a waterproof camera to capture the beauty of the islands, even in the rain. Don’t miss out on the unique experiences that Hawaii has to offer, such as stargazing or volcano tours. With a little planning and flexibility, you can enjoy a wonderful trip to Hawaii in December.
Conclusive Thoughts
Summing up, What is Hawaii Weather in December provides an in-depth look at the tropical climate during this month. The high-pressure systems, temperature fluctuations, and precipitation patterns all come together to create a unique and fascinating weather experience. Whether you’re a local or a visitor, understanding the weather in Hawaii during December will help you plan and enjoy your island activities to the fullest.
FAQ Resource: What Is Hawaii Weather In December
Is December a good time to visit Hawaii?
Yes, December is an excellent time to visit Hawaii, with mild temperatures and plenty of sunshine. It’s a great time for outdoor activities like surfing and hiking.
What is the average rainfall in Hawaii in December?
The average rainfall in Hawaii in December varies from island to island, but most areas receive between 2-4 inches of rain.
Are there any major storms in Hawaii in December?
While Hawaii can experience some storms in December, they are relatively rare and usually don’t have a significant impact on the island activities.
What are some recommended island activities for December?
Some recommended island activities for December include surfing, snorkeling, and hiking to enjoy the beautiful scenery and tropical climate.
