December weather forecastWaimalu, HI
December
Weather in December
December, the final month of the year, bestows Waimalu with a cool and temperate climate. As the temperature lowers around the holiday season, this Hawaiian city becomes a soothing retreat from the freezing temperatures of mainland America. Here, the sea temperature also drops slightly, opening opportunities for various water sports activities. The wind speed in December works its way down to 9.7mph (15.6km/h), affirming a calm atmosphere across the city. As Waimalu welcomes December, it embraces the serenity of coolness and the comfort of reduced daylight, marking an end to the year on a tranquil note.Temperature
The advent of December signifies a minor shift to an average high-temperature of a still moderately hot 76.5°F (24.7°C), aligning closely with November. The month of December is marked by an average minimum temperature of 70.5°F (21.4°C), slightly cooler than its daytime counterpart.Humidity
The months with the highest humidity are February and December, with an average relative humidity of 76%.Rainfall
In Waimalu, during December, the rain falls for 17 days and regularly aggregates up to 1.65" (42mm) of precipitation. Throughout the year, there are 208.4 rainfall days, and 16.5" (419mm) of precipitation is accumulated.Ocean temperature
In Waimalu, in December, the average water temperature is 77°F (25°C).Note: For any water activity, surface water temperatures between 77°F (25°C) and 84.2°F (29°C) are considered as excellent and extremely pleasant for lengthened periods.
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 6:53 am and sunset at 5:48 pm. On the last day of December, sunrise is at 7:09 am and sunset at 6:00 pm HST.
Sunshine
November and December, with an average of 6.3h of sunshine, are months with the least sunshine.UV index
The months with the lowest UV index are January through August, October through December, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for average individuals.Note: The average daily UV index of 6 in December transforms into the following instructions:
Sustain precautions and conform to sun safety norms. Preventing sunburn is necessary. The hours from 10 a.m. to 4 p.m. have the most intense UV radiation. As much as possible, limit direct sun exposure during this period. A hat with a generous brim can prevent nearly 50% of UV rays from reaching your eyes. Warning! The reflection of sand and water increases the UV dose.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Waimalu, HI
- Average high temperature in December: 76.5°F
The warmest months (with the highest average high temperature) are August and September (82°F).
The months with the lowest average high temperature are February and March (75.4°F).
- Average low temperature in December: 70.5°F
The month with the highest average low temperature is September (75°F).
The coldest month (with the lowest average low temperature) is February (68°F).
Average pressure in December
Waimalu, 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
Waimalu, HI
- Average wind speed in December: 9.1mph
The windiest month (with the highest average wind speed) is July (11.3mph).
The calmest month (with the lowest average wind speed) is January (8.4mph).
Average humidity in December
Waimalu, HI
- Average humidity in December: 76%
The months with the highest relative humidity are February and December (76%).
The months with the lowest relative humidity are April, May, June and September (74%).
Average rainfall in December
Waimalu, HI
- Average rainfall in December: 1.65"
The wettest month (with the highest rainfall) is October (2.09").
The driest month (with the least rainfall) is July (0.71").
Average rainfall days in December
Waimalu, HI
- Average rainfall days in December: 17 days
The month with the highest number of rainy days is March (20 days).
The month with the least rainy days is January (13.5 days).
Average sea temperature in December
Waimalu, HI
- Average sea temperature in December: 77°F
The best months for swimming (with the highest average sea temperature) are August, September and October (81°F).
The coldest months (with the lowest average sea temperature) are January, February, March and April (75°F).
Average daylight in December /
Average sunshine in December
Waimalu, 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 18min
The month with the most sunshine is June (Average sunshine: 9h and 54min).
The months with the least sunshine are November and December (Average sunshine: 6h and 18min).
Average sunshine days in December
Waimalu, HI
- Average sunshine days in December: 9.2 days
The month with the most sunshine days is January (12.3 days).
The month with the least sunshine days is November (6.2 days).
Average UV index in December
Waimalu, HI
- Average UV index in December: 6
The month with the highest UV index is September (UV index 7).
The months with the lowest UV index are January, February, March, April, May, June, July, August, October, November and December (UV index 6).
Average cloud cover in December
Waimalu, HI
- Average cloud cover in December: 40
The month with the most cloud cover is March (Cloud cover 44).
The month with the least cloud cover is January (Cloud cover 36).
Average visibility in December
Waimalu, 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).
