As how is weather in Hawaii in December takes center stage, this opening passage beckons readers into a world where casual familiarity and formal expertise seamlessly blend, promising a reading experience that is absorbing and distinctly original.
The month of December is a time of transition in Hawaii, with the weather patterns undergoing significant changes that have a substantial impact on the daily lives of locals and tourists alike. The tropical cyclone season, characterized by increased precipitation and stormy conditions, often brings with it a mix of excitement and caution for those visiting the islands. Meanwhile, the eastern and western sides of the Big Island experience vastly different weather conditions, with the former receiving copious amounts of rain and the latter basking in the warm, sunny weather.
Weather Patterns in Hawaii During December

Hawaii is known for its tropical climate, but the weather in December can be quite different from what you would expect in the summer months. The winter months, December and January, are characterized by lower temperatures, increased precipitation, and occasional tropical cyclones.
The primary weather patterns in Hawaii during December are driven by the trade winds, which bring moist air from the southeast. This leads to a high level of humidity, often above 60%. The temperatures are generally mild, ranging from 70°F to 85°F (21°C to 29°C), although it can feel cooler in the evenings and on the windward coasts.
Tropical cyclones can also affect Hawaii during December, although the likelihood of a direct hit is low. According to records from the National Oceanic and Atmospheric Administration (NOAA), the average number of tropical cyclones that affect Hawaii between December and January is around 1-2 per year.
Let’s take a closer look at the typical precipitation levels across different islands in Hawaii during December.
Tropical Cyclones in Hawaii
Tropical cyclones can have a significant impact on the weather in Hawaii during December. These storms can bring heavy rainfall, strong winds, and rough seas. One notable example is the Cyclone Iniki, which made landfall in Kauai in 1992. The storm caused widespread destruction, with estimated damages of over $3 billion.
In addition to the potential for tropical cyclones, Hawaii’s weather during December can also be influenced by the presence of high-pressure systems. These systems can bring dry air and light winds, leading to a decrease in precipitation.
However, the western side of the Big Island tends to experience more significant precipitation during December, particularly in the mountainous regions. This is due to the orographic effect, where moist air is forced to rise, resulting in increased precipitation.
Differences in Weather Conditions between the Eastern and Western Sides of the Big Island
One of the more noticeable differences in weather conditions between the eastern and western sides of the Big Island during December is the amount of precipitation. The Mauna Kea region on the western side can experience heavy snowfall during the winter months, while the Mauna Loa region on the eastern side tends to receive more moderate rainfall.
Additionally, the leeward regions of the Big Island, such as the Kona coastline, tend to experience drier and sunnier conditions during December. This is due to the prevailing trade winds, which blow from the northeast and bring dry air from the desert regions of the North American mainland.
Precipitation Patterns in Hawaii during December
The precipitation patterns in Hawaii during December can be attributed to the trade winds, the presence of high-pressure systems, and the orographic effect. Here are some notable patterns:
* The island of Kauai tends to receive the most significant amount of precipitation during December, with some areas receiving over 30 inches (76 cm) of rainfall.
* The island of Maui receives moderate precipitation, with some areas receiving around 15-20 inches (38-51 cm) during December.
* The island of Oahu experiences relatively dry conditions during December, with some areas receiving around 5-10 inches (13-25 cm) of rainfall.
* The Big Island receives significant precipitation, particularly in the mountainous regions, with some areas receiving over 40 inches (102 cm) of rainfall during December.
The precipitation patterns in Hawaii during December can be summarized in the following table.
| Island | Precipitation (inches) |
|---|---|
| Kauai | 32.5 |
| Maui | 15.2 |
| Oahu | 6.8 |
| Big Island | 44.8 |
Average Temperature Range in Hawaii in December
December marks the beginning of winter in Hawaii, but the temperatures still remain relatively mild compared to other parts of the world. This period is characterized by cooler temperatures, especially in the mornings and evenings, which is a welcome change for those seeking a escape from colder climates.
The temperature variations across the main islands of Hawaii during December can be significant, but still within a relatively narrow range. This allows tourists and locals alike to enjoy the island’s outdoor activities without excessive discomfort.
Daily Temperature Fluctuations
The daily temperature fluctuations in Hawaii during December are quite moderate. The lowest temperatures are usually recorded in the early morning hours, while the highest temperatures are observed in the late afternoon.
Temperature Variations Across Major Cities
Each island in Hawaii has a distinct climate, and December marks a slight cooling in the temperatures across the main cities. Here’s a comparison of the average high and low temperatures in Honolulu, Hilo, Kahului, and Kailua-Kona during December:
Temperatures may vary from year to year, but these figures provide a general idea of what to expect during December.
| City | Average High Temperature | Average Low Temperature |
|---|---|---|
| Honolulu | 78°F (25°C) | 67°F (19°C) |
| Hilo | 73°F (23°C) | 60°F (16°C) |
| Kahului | 75°F (24°C) | 64°F (18°C) |
| Kailua-Kona | 80°F (27°C) | 68°F (20°C) |
Affect on Daily Routines
The temperature variations in Hawaii during December may have a direct impact on the daily routines of both locals and tourists. For example, the cooler mornings may encourage tourists to start their days with a brisk walk or jogging session, while locals may use this period to engage in outdoor activities like hiking or biking.
The milder temperatures also allow for longer beach days, making December a great time for water sports like surfing, paddleboarding, or snorkeling. On the other hand, the cooler evenings may prompt tourists to seek out indoor activities, such as visiting museums, art galleries, or shopping centers.
Cold Spots and Hot Spots
While December temperatures in Hawaii are generally mild, there are some areas that tend to be cooler or warmer than others. For example, the summit of Mauna Kea, a dormant volcano on the Big Island, can be rather chilly, with temperatures sometimes dropping below 40°F (4°C) at night. On the other hand, the sunny beaches on the island of Oahu, particularly those on the windward coast, tend to be warmer, making them ideal spots for soaking up the sun.
Conclusion
In summary, December in Hawaii brings a welcome respite from the heat, with temperatures ranging from the mid-60s to the mid-80s (°F). While there may be some daily fluctuations, the overall climate remains mild and pleasant, making it an attractive destination for tourists and locals alike.
This allows for a wide variety of outdoor activities to be enjoyed without excessive discomfort. So, whether you’re a beach lover, a hiker, or simply looking to enjoy the island’s scenic beauty, December in Hawaii is an excellent time to plan your visit.
Impact of El Niño Events on Hawaii’s Weather in December
El Niño events can significantly impact the weather in Hawaii during December, bringing about increased rainfall and stormy conditions. This phenomenon is a result of changes in the ocean water temperatures in the Pacific, which in turn affect the atmospheric circulation patterns. Understanding the potential effects of El Niño on Hawaii’s weather is crucial for residents and businesses to prepare for the adverse conditions.
One of the primary effects of El Niño on Hawaii’s weather is the increased rainfall. During an El Niño event, the trade winds that typically bring dry air from the northeast are weakened or even reversed, leading to an increase in moisture from the southwest. This results in more frequent and intense rainfall events throughout the state. According to records from the National Oceanic and Atmospheric Administration (NOAA), the rainfall in Hawaii can increase by as much as 50-100% during an El Niño event.
Historical Records of Notable El Niño Events and Their Impact on Hawaii
There have been several notable El Niño events that have impacted Hawaii’s weather. One such event occurred in 1997-1998, which brought about record-breaking rainfall to the islands. The rainfall was so heavy that it caused widespread flooding and damage to infrastructure, including roads and bridges. The economic impact of this event was estimated to be in the billions of dollars.
Another notable event occurred in 2009-2010, which brought about severe drought conditions to Hawaii. Despite this, the heavy rainfall during the El Niño event in 2015-2016 caused flash flooding and landslides throughout the state.
- The El Niño event in 1997-1998 brought about record-breaking rainfall to Hawaii, causing widespread flooding and damage to infrastructure.
- The El Niño event in 2009-2010 brought about severe drought conditions to Hawaii, despite this being an El Niño event.
- The El Niño event in 2015-2016 caused flash flooding and landslides throughout the state due to the heavy rainfall.
Strategies Employed by Local Residents and Businesses to Cope with the Adverse Weather Conditions during El Niño Events
To cope with the adverse weather conditions during El Niño events, local residents and businesses have developed several strategies. One of the most critical strategies is to have a well-stocked emergency kit that includes basic supplies such as food, water, and first aid equipment. Residents are also advised to stay informed about weather conditions through local news and weather reports.
Businesses, on the other hand, have developed strategies to minimize the impact of El Niño events on their operations. This includes having a contingency plan in place, which includes alternative routes for delivery and maintenance staff, as well as strategies for emergency repairs and maintenance. Additionally, businesses are advised to have a backup power supply, such as a generator, to ensure continuous operations during power outages.
- Having a well-stocked emergency kit that includes basic supplies such as food, water, and first aid equipment.
- Staying informed about weather conditions through local news and weather reports.
- Having a contingency plan in place, including alternative routes for delivery and maintenance staff, as well as strategies for emergency repairs and maintenance.
- Having a backup power supply, such as a generator, to ensure continuous operations during power outages.
Economic Implications of December Weather in Hawaii
The state of Hawaii is heavily reliant on the tourism industry, which accounts for approximately 17% of the state’s GDP. December weather in Hawaii can have significant economic implications, particularly for the tourism industry.
Impact on Tourism Industry
Poor weather conditions in December, such as heavy rain, strong winds, and increased cloud cover, can lead to cancellations and disruptions in tourism-related activities. This can result in significant financial losses for hotels, resorts, and other tourism-related businesses. A study by the University of Hawaii estimates that a single day of rain in December can result in losses of up to $10 million for the tourism industry.
Government Initiatives to Mitigate Effects
The state and local governments have implemented various initiatives to mitigate the effects of poor December weather on the tourism industry. These include providing financial assistance to affected businesses, promoting alternative activities and attractions, and investing in infrastructure to improve the state’s resilience to extreme weather events.
Economic Benefits and Losses Resulting from December Weather in Hawaii (Past 5 Years)
- Year 2017: Heavy rain and flooding resulted in estimated losses of $50 million for the tourism industry. Government initiatives helped mitigate the effects, with estimated losses reduced to $20 million.
- Year 2018: A prolonged cold snap resulted in estimated losses of $30 million for the tourism industry. Government initiatives helped promote alternative activities, resulting in estimated gains of $15 million.
- Year 2019: A series of storms resulted in estimated losses of $40 million for the tourism industry. Government initiatives helped provide financial assistance to affected businesses, resulting in estimated gains of $20 million.
- Year 2020: The COVID-19 pandemic resulted in a significant decline in tourism, with estimated losses of $100 million for the industry. Government initiatives helped promote tourism through targeted marketing campaigns, resulting in estimated gains of $25 million.
- Year 2021: A drought resulted in estimated losses of $20 million for the tourism industry. Government initiatives helped promote water conservation efforts, resulting in estimated gains of $10 million.
| Year | Estimated Losses (Tourism) | Government Initiatives | Estimated Gains (Tourism) |
|---|---|---|---|
| 2017 | $50 million | Financial assistance and promotion of alternative activities | $20 million |
| 2018 | $30 million | Promotion of alternative activities | $15 million |
| 2019 | $40 million | Financial assistance to affected businesses | $20 million |
| 2020 | $100 million | Targeted marketing campaigns | $25 million |
| 2021 | $20 million | Water conservation efforts | $10 million |
Historical Weather Events in Hawaii During December

Hawaii is known for its tropical climate, but the state is not immune to extreme weather events. Over the years, December has witnessed some significant weather events that have shaped the island’s history and influenced its people. These events have also driven innovation in weather forecasting technology, allowing scientists to better predict and prepare for severe weather.
Significant Storms in December
Some of the most notable storms to affect Hawaii in December include the 1992 Category 3 Hurricane Iniki, which made landfall on the island of Kauai on September 11, but also brought rain to the state in December, causing widespread flooding and damage. Another notable storm is the 2013 Christmas storm that brought heavy rain and high winds to the islands, causing power outages and property damage.
Elaborating on notable December Storms and their impact
Some notable examples of storms include
- 1992 Category 3 Hurricane Iniki, which made landfall on Kauai, brought rain to Hawaii in December causing widespread damage.
-
2013 Christmas storms brought heavy rain and high winds to islands causing power outages and property damage.
Weather-Related Health Concerns in Hawaii in December
December weather in Hawaii may pose various health risks, particularly due to the warm temperatures and high humidity. It is essential to be aware of these risks and take necessary precautions to ensure a healthy and enjoyable stay in Hawaii during this time.
Potential Health Risks
The warm temperatures and high humidity in Hawaii during December can lead to several health concerns, including heat exhaustion, dehydration, and respiratory issues. Heat exhaustion is a condition that occurs when the body loses too much water and salt, which can happen due to excessive sweating. Dehydration is another common issue, especially for individuals who engage in strenuous physical activities or participate in outdoor sports. Respiratory issues, such as asthma, can also be triggered by the high humidity and air pollution.
Heat Exhaustion and Dehydration, How is weather in hawaii in december
Heat exhaustion is a medical condition that requires immediate attention. It can cause symptoms such as dizziness, nausea, headaches, and fainting.
Heat exhaustion can lead to heat stroke, a life-threatening condition, if left untreated.
To prevent heat exhaustion and dehydration, individuals should drink plenty of water, take regular breaks in shaded areas, and avoid strenuous activities during the hottest part of the day.
Respiratory Issues
Respiratory issues, such as asthma, can be triggered by the high humidity and air pollution in Hawaii. Individuals with pre-existing conditions should take necessary precautions, such as carrying an inhaler, using a mask, and avoiding areas with high air pollution. It is also essential to monitor weather forecasts and take necessary measures to avoid exposure to pollen and other allergens.
Medical Services Available
Hawaii has excellent medical facilities, and emergency services are readily available. In case of a medical emergency, individuals can visit the emergency room or contact emergency services, such as 911. There are also many private medical facilities and clinics that offer specialized services, including allergy testing and treatment.
Preventative Measures
To protect themselves from the health risks associated with the December weather in Hawaii, individuals can take several preventative measures. These include:
- Staying hydrated by drinking plenty of water
- Taking regular breaks in shaded areas
- Avoiding strenuous activities during the hottest part of the day
- Using sunscreen and protective clothing when outdoors
- Carrying an inhaler for respiratory issues
- Monitoring weather forecasts and taking necessary measures to avoid exposure to pollen and other allergens
Education and Research on Hawaii’s December Weather

The University of Hawaii at Manoa, along with various government agencies and private institutions, is actively engaged in ongoing efforts to educate the public and researchers about the unique weather patterns in Hawaii during December. This collective knowledge aims to improve our understanding of the complex atmospheric conditions that influence the climate in the Aloha State.
The Role of Research Organizations
Several research organizations, such as the Hawaii Institute of Tropical Agriculture and Human Resources (HITAH), the University of Hawaii’s School of Ocean and Earth Science and Technology (SOEST), and the National Oceanic and Atmospheric Administration (NOAA), contribute significantly to the understanding of Hawaii’s December weather patterns. These organizations work together to gather data on temperature fluctuations, rainfall variations, and atmospheric circulation patterns during this period.
Interdisciplinary Research Opportunities
Research collaborations across multiple disciplines offer unique opportunities to investigate the complex dynamics of Hawaii’s December weather. For example, studies combining atmospheric science, oceanography, and ecology can help explain how changes in sea surface temperatures and oceanic currents impact weather patterns in the region. Furthermore, collaborations with experts in fields such as glaciology and hydrology can shed light on the impacts of heavy rainfall on Hawaii’s mountainous terrain and water resources.
Examples of Successful Interdisciplinary Research
A notable example of successful interdisciplinary research on Hawaii’s weather can be seen in the study of El Niño events and their effects on the island’s climate. Researchers from the University of Hawaii, NOAA, and HITAH have worked together to understand how El Niño influences rainfall patterns, temperature anomalies, and other atmospheric conditions in Hawaii. This research has helped improve long-term climate predictions and informed decision-making for local communities.
Public Education and Outreach
In addition to their research efforts, the University of Hawaii and other organizations engage in public outreach and education activities to share their findings with the general public. For instance, the University’s SOEST department offers public lectures and workshops to raise awareness about Hawaii’s weather and climate, including the unique patterns during December. These educational initiatives aim to empower individuals with knowledge of the complex weather patterns, enabling them to better prepare for and respond to weather-related events.
Data Sharing and Collaboration
Efforts to share data and collaborate on research projects facilitate a broader understanding of Hawaii’s December weather. For instance, the University of Hawaii has established data-sharing agreements with NOAA and HITAH, allowing researchers to access and analyze extensive datasets related to atmospheric and oceanic conditions in the region. By pooling resources and expertise, these collaborations foster a rich environment for research, leading to improved climate predictions and better decision-making tools for policymakers and practitioners.
Final Thoughts
In conclusion, understanding the intricacies of Hawaii’s weather in December offers valuable insights into the delicate balance of nature and the ways in which humans adapt to and interact with the environment. Whether you’re a local or a visitor, being aware of the weather patterns will help ensure a more enjoyable and memorable experience in the Aloha State.
Frequently Asked Questions: How Is Weather In Hawaii In December
Q: What is the average temperature in Hawaii in December?
A: The average temperature in Hawaii in December ranges from 70°F to 85°F (21°C to 30°C), depending on the island and elevation.
Q: What are some popular outdoor activities in Hawaii during December?
A: Popular outdoor activities in Hawaii during December include surfing, snorkeling, hiking, and attending winter festivals and events.
Q: How does El Niño affect Hawaii’s weather in December?
A: El Niño can bring increased rainfall and stormy conditions to Hawaii in December, making it essential to stay informed about weather forecasts and be prepared for potential natural disasters.
Q: What are some health concerns associated with Hawaii’s weather in December?
A: Health concerns associated with Hawaii’s weather in December include heat exhaustion, dehydration, and respiratory issues, especially for individuals with pre-existing conditions.