December Weather in Hilo, United States

Last updated: February 24, 2025

December in Hilo, United States is characterized by mild temperatures and a substantial amount of rainfall. The maximum temperature reaches a comfortable 26°C (78°F), while the average settles at 22°C (71°F), with minimums around 18°C (65°F). This month sees about 228 mm (9.0 in) of precipitation over approximately 24 days, contributing to a high humidity level of 81%. Visitors can expect a lush, tropical atmosphere, with occasional showers enhancing Hilo's captivating natural beauty.

December Temperature in Hilo

In Hilo, United States, December brings a delightful mix of warmth and mildness as temperatures transition towards the end of the year. With minimums around 18°C (65°F) and maximums peaking at 26°C (78°F), the weather is generally pleasant, perfect for outdoor activities. The average temperature hovers around 22°C (71°F), a slight dip from the warmer months of summer, yet still inviting. As the year rounds off, Hilo maintains its tropical charm, mirroring the consistent warmth seen from January through November, making it an ideal escape from the harsh winter weather experienced elsewhere.

December Weather in Hilo: Daily Temperature Highs, Lows, and Averages

The chart illustrates December temperature patterns in Hilo, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends.
JanFebMarAprMayJunJulAugSepOctNovDec707070717273747575757371
Data source: Temperature data for Hilo generated using information from the Copernicus Climate Change Service.
Choose your preferred temperature unit
The average of daily temperatures (24 hours) calculated across all days in the month.

December Precipitation in Hilo

In Hilo, United States, December brings a significant surge in precipitation, with 228 mm (9.0 in) accumulating over 24 days of rain. This month stands out as one of the wetter periods of the year, following closely behind February, which records the highest average. The trend of increasing rainfall from the drier summer months reflects a transition into the wet season, accentuating Hilo’s reputation as one of the rainiest cities in the U.S. Thus, while December may seem daunting with its frequent downpours, it is a quintessential part of the region's lush and vibrant ecosystem, setting the stage for the blooming flora that the area is celebrated for.

December Precipitation Trends in Hilo

The chart displays monthly precipitation patterns in Hilo, with values for each month alongside December's data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how December's conditions compare to those of other months.
JanFebMarAprMayJunJulAugSepOctNovDec158262225195166107131197109189153228
Data source: Precipitation data for December generated using information from the Copernicus Climate Change Service.
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December Humidity in Hilo

In Hilo, United States, the humidity levels in December average a moderate 81%, reflecting a trend of consistent moisture throughout the year. Starting the year with a steady 79% in January and February, the humidity gradually rises, peaking at 84% in August. Interestingly, the latter part of the year, from October through December, maintains humidity around 83%, indicating a slight dip by winter's arrival. This pattern showcases Hilo's tropical climate, where humidity remains relatively high, enhancing the lush greenery that the region is famous for. December, while slightly less humid than the summer months, still embodies the persistent, rich moisture that characterizes this beautiful locale.

December Average Humidity in Hilo

This chart illustrates the average monthly humidity levels in Hilo, with December's data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, allowing you to see how December's humidity levels compare to other months.
JanFebMarAprMayJunJulAugSepOctNovDec79%79%77%80%80%82%83%84%82%83%83%81%
Data source: Humidity data for December generated using information from the Copernicus Climate Change Service.

December UV Index in Hilo

December in Hilo, United States, marks a transition as the UV Index drops to 8, indicating a very high level of sun exposure, with a burn time of about 15 minutes. This trend reflects a slight decrease from the previous months, where the indexes peaked at 14 during the summer, aligning with the extreme exposure category. As the year concludes, December reminds us of the ongoing need for sun protection even as temperatures cool. Whether you're soaking up the tropical sun or enjoying outdoor activities, it's essential to stay vigilant about UV exposure. For more information on daily updates, check out Hilo UV Index.

Maximum UV Index Levels in Hilo for December

The chart shows the monthly maximum UV Index (UVI) for Hilo in December, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues.
JanFebMarAprMayJunJulAugSepOctNovDec811121313131414131298
Data source: Hilo December UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

December Sunshine in Hilo

December in Hilo, United States, experiences a delightful 252 hours of sunshine, adding a vibrant touch to the festive season. Unlike the sun-soaked months of summer, which peak in July with 339 hours, December signals a gentle tapering off of daylight. Despite this decrease, Hilo still basks in abundant sunlight compared to the winter months that many other locations endure. With a commendable total that exceeds the lower totals of the early year, December serves as a reminder of Hawaii’s unique tropical charm, inviting both locals and visitors to enjoy the beauty of the island in its holiday glow. As the year closes, the sunshine continues to play a vital role in Hilo’s warm, inviting atmosphere.

Monthly Sunshine Duration in Hilo: December Highlighted

The December sunshine duration represents the total number of hours Hilo experiences direct sunlight during the month of December, excluding cloudy or obstructed periods. This chart compares the sunshine duration of December with the other months of the year.
JanFebMarAprMayJunJulAugSepOctNovDec212h244h249h284h318h331h339h323h305h283h260h252h
Data source: Hilo December Sunshine duration data generated using information from the Copernicus Climate Change Service.

Chance of Sun in Hilo During December

In Hilo, December sees a notable dip in the likelihood of sunny weather, with only a 27% chance of sunshine. This marks a significant decline compared to the preceding months, where sunshine probabilities hovered between 31% and 47% from January through November. As the year draws to a close, residents and visitors alike may experience an increasing propensity for cloudier skies and precipitation, signaling the onset of winter weather. Notably, December stands out as the month with the least sunshine, suggesting that those planning outdoor activities should brace for the possibility of more overcast days during this festive time of year.

Percentage of Sunny Days in December in Hilo

The chart illustrates the percentage of sunny days in Hilo throughout the year, with December highlighted. It highlights the variation in sunshine across each month and provides an overview of the typical frequency of sunny days, offering insights into how often Hilo experiences clear skies throughout the year.
JanFebMarAprMayJunJulAugSepOctNovDec41%47%36%42%42%43%31%45%43%43%43%27%
Data source: Hilo December chance of sun data, generated using information from the Copernicus Climate Change Service.

Daylight Hours in Hilo in December

As December arrives in Hilo, United States, daylight hours begin to taper off, with the city experiencing just 10 hours of sunlight. This downward trend starts in October when daylight shrinks to 11 hours and continues through the end of the year. Leading up to December, the longest daylight stretches are seen in May through July, with a peak of 13 hours, providing a bright contrast to the winter months. As the calendar flips through the year, Hilo showcases a distinct rhythm, from the longer, sun-drenched days of spring and summer to the shorter, cozy afternoons of winter, highlighting the natural ebb and flow of sunlight that characterizes this tropical locale.

Average Daylight Hours in Hilo for December

The chart illustrates the variation in daylight duration in Hilo throughout the year, with December highlighted. It shows the monthly changes in daylight hours, calculated by summing the hours between sunrise and sunset.
JanFebMarAprMayJunJulAugSepOctNovDec11h 4m11h 29m12h 2m12h 36m13h 4m13h 17m13h 10m12h 45m12h 12m11h 39m11h 10m10h 56m
Data source: Hilo daylight hours, calculated by summing the hours between sunrise and sunset for each day.

December Winds in Hilo

As December arrives in Hilo, the wind begins to pick up slightly, averaging 3.4 m/s (8 mph), which is notably stronger than the preceding months. This shift suggests a trend towards more invigorating breezes as the year draws to a close, particularly when compared to the gentler winds of summer and early fall. After an average of 2.6 m/s (6 mph) in September, wind speeds gradually increase through the autumn months, culminating in a refreshing December that heralds the advent of winter. The increased wind speed, surpassing the January figure of 2.9 m/s (6 mph), may entice locals and visitors alike to enjoy outdoor activities as they embrace Hilo's dynamic climate.

Average December Wind Speed in Hilo

The chart displays monthly wind speed patterns in Hilo, with values for each month shown alongside December's data, which is highlighted for easy comparison. It illustrates the average wind speed, offering insights into how December's wind conditions compare to the rest of the year.
JanFebMarAprMayJunJulAugSepOctNovDec2.93.33.53.13.32.93.02.92.62.73.13.4 m/s
Data source: Hilo December wind data, generated using information from the Copernicus Climate Change Service.

How December Weather in Hilo Compares to Other Months

The weather in Hilo changes throughout the year, offering a unique experience in each season. Below is a month-by-month comparison of December's weather with other months, highlighting differences in temperature, precipitation, and other key factors. Click on each section to discover seasonal trends in Hilo and find detailed weather information for every month.

In December, the weather tends to be slightly warmer with temperatures ranging from a minimum of 18°C (65°F) to a maximum of 26°C (78°F), while January experiences similar minimum temperatures but slightly cooler maximums, peaking at 25°C (77°F). December is marked by higher precipitation, totaling 228 mm (9.0 in) over 24 days, compared to January's 158 mm (6.2 in) over 20 days. Additionally, humidity levels are a bit higher in December at 81% versus 79% in January, making the latter month feel a touch drier overall. For more specific details, check out Hilo weather in January.

December and February in Hilo exhibit similar temperature ranges, with both months showcasing mild conditions. December typically sees a slight increase in average temperature, ranging from a minimum of 18°C (65°F) to a maximum of 26°C (78°F), contrasted with February’s slightly lower minimum of 17°C (62°F) and the same maximum. However, February experiences more precipitation, with 262 mm (10.3 in) falling over 23 days, compared to December's 228 mm (9.0 in) over 24 days. Humidity levels are also relatively close, sitting at 81% in December and a bit lower at 79% in February. For more detailed insights, you can check out Hilo weather in February.

In December, the weather in Hilo is characterized by mild temperatures, ranging from a minimum of 18°C (65°F) to a maximum of 26°C (78°F), with an average temperature of 22°C (71°F). However, it tends to be quite rainy, with precipitation reaching 228 mm (9.0 in) over 24 days and humidity levels at 81%. In contrast, March sees slightly cooler temperatures, with a minimum of 17°C (64°F) and the same maximum of 26°C (78°F), while the average drops slightly to 21°C (70°F). Precipitation is also a touch lower at 225 mm (8.8 in), but occurs over 26 days, and humidity is slightly reduced at 77%. For a more detailed look at the weather in March, you can visit Hilo weather in March.

In December, Hilo experiences a warm climate with temperatures ranging from a minimum of 18°C (65°F) to a maximum of 26°C (78°F), averaging around 22°C (71°F). The month is quite wet, with an average precipitation of 228 mm (9.0 in) occurring over 24 days, resulting in high humidity levels at 81%. In contrast, April shares similar temperature ranges, maintaining a minimum of 18°C (65°F) and a maximum of 26°C (80°F), with an average of 22°C (71°F). However, rainfall is slightly less in April, totaling 195 mm (7.7 in) over 25 days, and humidity remains just a touch lower at 80%. For more information on Hilo's April weather, you can visit Hilo weather in April.

In December, the weather features a comfortable average temperature of 22°C (71°F) with daily highs reaching up to 26°C (78°F). However, it also sees a significant amount of rainfall, totaling 228 mm (9.0 in) across 24 days, paired with a high humidity level of 81%. In comparison, May maintains a similar average temperature of 22°C (73°F) and a maximum temperature that is only slightly higher at 26°C (79°F). The precipitation in May is lower at 166 mm (6.5 in), albeit spread over 27 days, and the humidity remains nearly equivalent at 80%. For more detailed insights, you can check Hilo weather in May.

When comparing the weather in December and June, both months exhibit warm temperatures, but December tends to be slightly cooler overall, with average daily highs reaching 26°C (78°F) compared to June's 27°C (80°F). December has a higher minimum temperature at 18°C (65°F) than June's 20°C (69°F), but the overall humidity remains quite similar, with December at 81% and June at 82%. Precipitation is notably higher in December, totaling 228 mm (9.0 in) over 24 days, compared to June's 106 mm (4.2 in) across 25 days. This means that while both months experience considerable rainfall, December's wetness is more pronounced. For more specific insights on Hilo's weather during June, you can check Hilo weather in June.

December and July in Hilo present contrasting yet similarly humid weather patterns. In December, temperatures range from a minimum of 18°C (65°F) to a maximum of 26°C (78°F), with an average of 22°C (71°F). The month is notably wetter, receiving 228 mm (9.0 in) of precipitation over 24 days, resulting in a humidity level of 81%. In contrast, July sees slightly warmer temperatures, with a minimum of 21°C (70°F) and a maximum of 29°C (85°F), averaging 24°C (75°F). This month has less rainfall, totaling 131 mm (5.1 in) over 28 days, while humidity remains high at 83%. For more details, check out Hilo weather in July.

When comparing the weather in December and August, it’s clear that both months offer warm temperatures with December being slightly cooler overall. In December, the temperature ranges from a minimum of 18°C (65°F) to a maximum of 26°C (78°F), averaging around 22°C (71°F). In contrast, August features higher temperatures, with a minimum of 21°C (70°F) and a maximum of 27°C (82°F), averaging 24°C (75°F).

Precipitation levels are relatively high in both months, but December experiences more rainfall with 228 mm (9.0 in) over 24 days compared to August's 197 mm (7.8 in) spread across 27 days. Humidity also remains high, with December at 81% and August slightly higher at 84%. For more details on Hilo's weather during August, check out Hilo weather in August.

In December, the weather in Hilo is characterized by slightly cooler temperatures, with a minimum of 18°C (65°F) and a maximum of 26°C (78°F), averaging around 22°C (71°F). In contrast, September experiences a warmer temperature range, with a minimum of 21°C (71°F) and a maximum of 28°C (82°F), averaging 24°C (76°F). Additionally, December sees significantly more precipitation at 228 mm (9.0 in) over 24 days, compared to September's 108 mm (4.3 in) across the same number of days. Both months maintain similar humidity levels, with December at 81% and September slightly higher at 82%. For a more detailed look, you can check the Hilo weather in September.

In comparing the weather of December and October, December tends to be slightly cooler with average temperatures ranging from a minimum of 18°C (65°F) to a maximum of 26°C (78°F), while October experiences slightly warmer averages with temperatures from a minimum of 20°C (69°F) to a maximum of 28°C (82°F). Additionally, December sees more rainfall, with 228 mm (9.0 in) of precipitation over 24 days, compared to October's 189 mm (7.4 in) over 23 days. Humidity levels are fairly similar, with December at 81% and October slightly higher at 83%. For more detailed information, you can visit Hilo weather in October.

In comparing the weather between November and December, December tends to be slightly cooler, with average temperatures decreasing from a minimum of 20°C (68°F) in November to a minimum of 18°C (65°F) in December. However, December sees a slight increase in precipitation, totaling 228 mm (9.0 in) over 24 days, compared to November's 153 mm (6.0 in) over the same number of days. Despite this increase in rain, humidity levels are slightly lower in December at 81%, compared to November's 83%. Overall, while both months experience wet conditions, December is characterized by cooler temperatures and more significant rainfall. For more details, visit Hilo weather in November.

Compare Hilo's Climate with Cities Worldwide

Conclusion: What to Expect From December Weather in Hilo

As December sets in, Hilo experiences a notable shift in weather, characterized by its mild temperatures and a significant increase in rainfall compared to other months. With the average temperature hovering around a comfortable 22°C, the island remains inviting, albeit with a higher likelihood of precipitation on 24 days during the month. This aligns with Hilo's tropical climate, where humidity levels soar to about 81%, often making it feel warmer than it is. The 228 mm of rain during this time contributes to the lush landscapes that Hawaii is famous for, but it's essential for visitors to pack accordingly. For a deeper dive into Hilo’s weather patterns throughout the year, check out Hilo Climate.