December weather forecastHakalau, HI
December
Weather in December
December, the first month of the winter in Hakalau, is also an agreeable month, with an average temperature varying between 66.4°F (19.1°C) and 71.6°F (22°C).Temperature
As Hakalau transitions into December, the average high-temperature stands at a still agreeable 71.6°F (22°C), offering little variation from the preceding month. During the nights of December, the average low-temperature holds at a comfortable 66.4°F (19.1°C).Humidity
In Hakalau, the average relative humidity in December is 79%.Rainfall
In December, the rain falls for 18.4 days. Throughout December, 2.64" (67mm) of precipitation is accumulated. Throughout the year, there are 227.7 rainfall days, and 27.83" (707mm) of precipitation is accumulated.Daylight
December has the shortest days of the year, with an average of 11h and 0min of daylight.On the first day of the month, sunrise is at 6:39 am and sunset at 5:40 pm. On the last day of December, sunrise is at 6:55 am and sunset at 5:52 pm HST.
Sunshine
With an average of 6.5h of sunshine, December has the least sunshine of the year.UV index
The months with the highest UV index are May through December, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: During December, 6 as the daily maximum UV index converts into the following advice:
Persist with precautions and heed sun safety advice. Prevention of sunburn is compulsory. Between 10 a.m. and 4 p.m., the Sun emits the most powerful UV radiation. Limit direct exposure to the Sun during these hours. To cut down UV radiation exposure by about half, sport a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Hakalau, HI
- Average high temperature in December: 71.6°F
The warmest month (with the highest average high temperature) is August (75.4°F).
The month with the lowest average high temperature is March (69.6°F).
- Average low temperature in December: 66.4°F
The month with the highest average low temperature is September (70°F).
The coldest month (with the lowest average low temperature) is March (64°F).
Average pressure in December
Hakalau, 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
Hakalau, HI
- Average wind speed in December: 6.9mph
The windiest month (with the highest average wind speed) is August (7.6mph).
The calmest month (with the lowest average wind speed) is October (6.7mph).
Average humidity in December
Hakalau, HI
- Average humidity in December: 79%
The month with the highest relative humidity is March (80%).
The months with the lowest relative humidity are January, May, June and July (78%).
Average rainfall in December
Hakalau, HI
- Average rainfall in December: 2.64"
The wettest month (with the highest rainfall) is February (3.78").
The driest month (with the least rainfall) is June (1.1").
Average rainfall days in December
Hakalau, HI
- Average rainfall days in December: 18.4 days
The month with the highest number of rainy days is March (22.9 days).
The month with the least rainy days is January (13.3 days).
Average daylight in December /
Average sunshine in December
Hakalau, 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 June (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 6h and 30min).
Average sunshine days in December
Hakalau, HI
- Average sunshine days in December: 6.2 days
The month with the most sunshine days is January (12.1 days).
The month with the least sunshine days is August (1.8 days).
Average UV index in December
Hakalau, HI
- Average UV index in December: 6
The months with the highest UV index are May, June, July, August, September, October, November and December (UV index 6).
The months with the lowest UV index are January, February, March and April (UV index 5).
Average cloud cover in December
Hakalau, HI
- Average cloud cover in December: 33
The month with the most cloud cover is March (Cloud cover 42).
The month with the least cloud cover is January (Cloud cover 26).
Average visibility in December
Hakalau, 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).
