December weather forecastKailua, HI
December
Weather in December
December wraps up the year in Kailua with classic winter weather changes. Temperatures drop again to a lower limit of 73.2°F (22.9°C), enveloping the city with a pleasant chill. The rainfall amplifies to 1.57" (40mm), making it the wettest month of the year with 14.9 rainfall days. However, the high wind gusts of 16.5mph (26.6km/h) provide a fresh break from the year-long stable climate. The sunlit hours reduce further, signaling the end of another cycle around the sun in Kailua, Hawaii.Temperature
Transitioning into December, Kailua experiences an average high-temperature of a still moderately hot 75.9°F (24.4°C), marking a minor shift from the preceding month. During December, Kailua's temperature shows a minor deviation from daytime highs, falling to a steady low-temperature average of 73.2°F (22.9°C).Humidity
April, June through August and December, with an average relative humidity of 76%, are the most humid months in Kailua, Hawaii.Rainfall
In Kailua, Hawaii, in December, it is raining for 14.9 days, with typically 1.57" (40mm) of accumulated precipitation. Throughout the year, there are 169.9 rainfall days, and 13.15" (334mm) of precipitation is accumulated.Ocean temperature
In December, the average ocean temperature in Kailua is 77°F (25°C).Note: Water temperature between 77°F (25°C) and 84.2°F (29°C) provides warmth and pleasure, making water activities enjoyable for lengthened periods without feeling uncomfortable.
Daylight
December has the shortest days of the year in Kailua, with an average of 10h and 54min of daylight.On the first day of December in Kailua, sunrise is at 6:52 am and sunset at 5:47 pm. On the last day of the month, sunrise is at 7:08 am and sunset at 6:00 pm HST.
Sunshine
The month with the least sunshine in Kailua is December, with an average of 6.6h of sunshine.UV index
The months with the lowest UV index are January through June, November and December, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum daily UV index of 6 in December interprets into the following recommendations:
Take precautions and adopt sun safety practices. Protection against sunburn is obliged. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. A wide-brimmed hat provides unparalleled sun protection for sensitive areas like the eyes, ears, and neck. Caution! Sand and water reflections can notably increase the UV radiation intensity.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Kailua, HI
- Average high temperature in December: 75.9°F
The warmest month (with the highest average high temperature) is September (80.6°F).
The month with the lowest average high temperature is February (74.5°F).
- Average low temperature in December: 73.2°F
The months with the highest average low temperature are September and October (77°F).
The coldest month (with the lowest average low temperature) is February (70.5°F).
Average pressure in December
Kailua, HI
- Average pressure in December: 30"Hg
The month with the highest atmospheric pressure is April (30.06"Hg).
The months with the lowest atmospheric pressure are September and October (29.97"Hg).
Average wind speed in December
Kailua, HI
- Average wind speed in December: 12mph
The windiest month (with the highest average wind speed) is July (14.1mph).
The calmest month (with the lowest average wind speed) is January (10.7mph).
Average humidity in December
Kailua, HI
- Average humidity in December: 76%
The months with the highest relative humidity are April, June, July, August and December (76%).
The months with the lowest relative humidity are January and November (74%).
Average rainfall in December
Kailua, HI
- Average rainfall in December: 1.57"
The wettest month (with the highest rainfall) is March (1.69").
The driest month (with the least rainfall) is July (0.55").
Average rainfall days in December
Kailua, HI
- Average rainfall days in December: 14.9 days
The month with the highest number of rainy days is March (16.9 days).
The month with the least rainy days is June (11.3 days).
Average sea temperature in December
Kailua, HI
- Average sea temperature in December: 77°F
The best month for swimming (with the highest average sea temperature) is September (80.4°F).
The coldest month (with the lowest average sea temperature) is March (75.7°F).
Average daylight in December /
Average sunshine in December
Kailua, HI
- Average daylight in December: 10h and 54min
The month with the longest days is June (Average daylight: 13h and 24min).
The month with the shortest days is December (Average daylight: 10h and 54min).
- Average sunshine in December: 6h and 36min
The month with the most sunshine is June (Average sunshine: 11h and 12min).
The month with the least sunshine is December (Average sunshine: 6h and 36min).
Average sunshine days in December
Kailua, HI
- Average sunshine days in December: 8.1 days
The month with the most sunshine days is June (13.6 days).
The months with the least sunshine days are March and November (6.6 days).
Average UV index in December
Kailua, HI
- Average UV index in December: 6
The months with the highest UV index are July, August, September and October (UV index 7).
The months with the lowest UV index are January, February, March, April, May, June, November and December (UV index 6).
Average cloud cover in December
Kailua, HI
- Average cloud cover in December: 32
The month with the most cloud cover is March (Cloud cover 36).
The month with the least cloud cover is September (Cloud cover 27).
Average visibility in December
Kailua, HI
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
