December weather forecastKeanakolu, HI
December
Weather in December
The first month of the winter, December, is still a comfortable month in Keanakolu, Hawaii, with an average temperature fluctuating between 54.3°F (12.4°C) and 63°F (17.2°C).Temperature
December brings an average high-temperature of a still comfortable 63°F (17.2°C), nearly identical to the preceding month. December registers an average low temperature of 54.3°F (12.4°C), subtly lower than the daytime maximum.Humidity
The average relative humidity in December in Keanakolu is 81%.Rainfall
In December, in Keanakolu, the rain falls for 20.7 days. Throughout December, 3.27" (83mm) of precipitation is accumulated. Throughout the year, there are 280.8 rainfall days, and 33.9" (861mm) of precipitation is accumulated.Daylight
With an average of 11h and 0min of daylight, December has the shortest days of the year in Keanakolu.On the first day of the month, sunrise is at 6:40 am and sunset at 5:41 pm. On the last day of December, sunrise is at 6:56 am and sunset at 5:53 pm HST.
Sunshine
December has the least sunshine of the year, with an average of 6.5h of sunshine.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 of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum UV index of 4 during December translates into these guidelines:
Exercise care. People with light skin might get burns in fewer than 30 minutes. The intensity of the Sun's UV radiation during midday suggests reducing time spent outdoors. Tightly woven clothing, when worn loosely, shields effectively against the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Keanakolu, 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
Keanakolu, 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
Keanakolu, 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
Keanakolu, 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
Keanakolu, 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
Keanakolu, 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
Keanakolu, HI
- Average daylight in December: 11h and 0min
The month with the longest days is June (Average daylight: 13h and 18min).
The month with the shortest days is December (Average daylight: 11h and 0min).
- 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
Keanakolu, 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
Keanakolu, 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
Keanakolu, 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
Keanakolu, 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).
