December weather forecastKapaau, HI
December
Weather in December
December, the first month of the winter in Kapaau, is still a refreshing month, with an average temperature fluctuating between 63°F (17.2°C) and 54.3°F (12.4°C).Temperature
The commencement of December records an average high-temperature of a still comfortable 63°F (17.2°C), barely varying from November's 63.5°F (17.5°C). In Kapaau, the nocturnal temperatures throughout December show a marginal dip from the daytime averages, settling at a fresh 54.3°F (12.4°C).Humidity
In December, the average relative humidity is 81%.Rainfall
In December, the rain falls for 20.7 days. Throughout December, 3.27" (83mm) of precipitation is accumulated. In Kapaau, during the entire year, the rain falls for 280.8 days and collects up to 33.9" (861mm) of precipitation.Daylight
December has the shortest days of the year, with an average of 10h and 54min of daylight.On the first day of the month, sunrise is at 6:42 am and sunset at 5:42 pm. On the last day of December, sunrise is at 6:58 am and sunset at 5:54 pm HST.
Sunshine
With an average of 6.5h of sunshine, December has the least sunshine of the year.UV index
January through April, November and December, with an average maximum UV index of 4, are months with the lowest UV index. A UV Index estimate of 3 to 5 represents a moderate health risk from unprotected exposure to Sun's UV rays for average individuals.Note: A daily maximum UV index of 4 in December translates into the following instructions:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. The Sun's harshest UV rays are around midday; it's wise to seek shade and limit time outdoors. By wearing a generously brimmed hat, you can cut UV radiation exposure significantly.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Kapaau, HI
- Average high temperature in December: 63°F
The warmest month (with the highest average high temperature) is August (67.5°F).
The month with the lowest average high temperature is March (61.9°F).
- Average low temperature in December: 54.3°F
The month with the highest average low temperature is September (59°F).
The coldest month (with the lowest average low temperature) is February (52°F).
Average pressure in December
Kapaau, HI
- Average pressure in December: 29.99"Hg
The month with the highest atmospheric pressure is April (30.05"Hg).
The months with the lowest atmospheric pressure are September and October (29.97"Hg).
Average wind speed in December
Kapaau, HI
- Average wind speed in December: 5mph
The windiest months (with the highest average wind speed) are July and August (5.5mph).
The calmest months (with the lowest average wind speed) are January, May and October (4.5mph).
Average humidity in December
Kapaau, HI
- Average humidity in December: 81%
The months with the highest relative humidity are September and October (84%).
The month with the lowest relative humidity is February (78%).
Average rainfall in December
Kapaau, HI
- Average rainfall in December: 3.27"
The wettest month (with the highest rainfall) is August (4.13").
The driest month (with the least rainfall) is June (1.57").
Average rainfall days in December
Kapaau, HI
- Average rainfall days in December: 20.7 days
The month with the highest number of rainy days is September (27.3 days).
The month with the least rainy days is January (17.1 days).
Average daylight in December /
Average sunshine in December
Kapaau, HI
- Average daylight in December: 10h and 54min
The month with the longest days is June (Average daylight: 13h and 18min).
The month with the shortest days is December (Average daylight: 10h and 54min).
- Average sunshine in December: 6h and 30min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is December (Average sunshine: 6h and 30min).
Average sunshine days in December
Kapaau, HI
- Average sunshine days in December: 7.4 days
The month with the most sunshine days is January (9.7 days).
The month with the least sunshine days is September (0.8 days).
Average UV index in December
Kapaau, HI
- Average UV index in December: 4
The months with the highest UV index are May, June, July, August, September and October (UV index 5).
The months with the lowest UV index are January, February, March, April, November and December (UV index 4).
Average cloud cover in December
Kapaau, HI
- Average cloud cover in December: 36
The months with the most cloud cover are April and September (Cloud cover 43).
The month with the least cloud cover is January (Cloud cover 29).
Average visibility in December
Kapaau, 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).
