December weather forecastWahiawa, HI
December
Weather in December
December wraps up the year in Wahiawa with a charming mix of warmth and showers. The Hawaiian winter emerges, though the degree of cold is merely moderate when compared to mainland U.S.A., resulting in an ideal climate for year-end celebrations and festivities. Outdoor activities continue to flourish, with the weather catering to all visitors' comfort. Talking about extremes this month, wind gusts reach 11.3mph (18.2km/h), making December the month with the highest wind gusts.Temperature
The onset of December brings an average high-temperature of a still moderately hot 76.5°F (24.7°C), nearly matching the November temperature. In Wahiawa, the month of December brings a consistent average low-temperature of 69.4°F (20.8°C), slightly cooler than its daytime highs.Humidity
February and December, with an average relative humidity of 77%, are the most humid months.Rainfall
In Wahiawa, in December, it is raining for 18.8 days, with typically 1.97" (50mm) of accumulated precipitation. Throughout the year, there are 252.2 rainfall days, and 22.09" (561mm) of precipitation is accumulated.Daylight
The month with the shortest days is December, with an average of 10h and 48min of daylight.On the first day of December, sunrise is at 6:54 am and sunset at 5:48 pm. On the last day of the month, sunrise is at 7:09 am and sunset at 6:01 pm HST.
Sunshine
In December, the average sunshine is 5.7h.UV index
The months with the lowest UV index are January, February and December, with an average maximum UV index of 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for average individuals.Note: In December, the maximum UV index of 5 suggests these recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Wahiawa, HI
- Average high temperature in December: 76.5°F
The warmest month (with the highest average high temperature) is August (82.6°F).
The month with the lowest average high temperature is February (75.6°F).
- Average low temperature in December: 69.4°F
The month with the highest average low temperature is September (74.3°F).
The coldest month (with the lowest average low temperature) is February (66.7°F).
Average pressure in December
Wahiawa, 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
Wahiawa, HI
- Average wind speed in December: 8.1mph
The windiest months (with the highest average wind speed) are June and July (10.2mph).
The calmest month (with the lowest average wind speed) is October (7.6mph).
Average humidity in December
Wahiawa, HI
- Average humidity in December: 77%
The months with the highest relative humidity are February and December (77%).
The month with the lowest relative humidity is September (73%).
Average rainfall in December
Wahiawa, HI
- Average rainfall in December: 1.97"
The wettest month (with the highest rainfall) is October (2.6").
The driest month (with the least rainfall) is July (1.26").
Average rainfall days in December
Wahiawa, HI
- Average rainfall days in December: 18.8 days
The month with the highest number of rainy days is August (23.8 days).
The month with the least rainy days is January (16 days).
Average daylight in December /
Average sunshine in December
Wahiawa, HI
- Average daylight in December: 10h and 48min
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 48min).
- Average sunshine in December: 5h and 42min
The month with the most sunshine is June (Average sunshine: 8h and 24min).
The month with the least sunshine is November (Average sunshine: 5h and 36min).
Average sunshine days in December
Wahiawa, HI
- Average sunshine days in December: 7.4 days
The month with the most sunshine days is January (10.8 days).
The month with the least sunshine days is August (3.3 days).
Average UV index in December
Wahiawa, HI
- Average UV index in December: 5
The months with the highest UV index are March, April, May, June, July, August, September, October and November (UV index 6).
The months with the lowest UV index are January, February and December (UV index 5).
Average cloud cover in December
Wahiawa, HI
- Average cloud cover in December: 47
The month with the most cloud cover is June (Cloud cover 52).
The month with the least cloud cover is January (Cloud cover 43).
Average visibility in December
Wahiawa, 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).
