December weather forecastHana, HI
December
Weather in December
Rounding off the year, December in Hana, Hawaii, is a symphony of cool tones. The dramatic decrease in sunshine hours and an increase in rainfall signify the winter's arrival. The sea temperature starts a gradual decline, yet remains invitingly warm for water enthusiasts. However, despite the weather change, wind gusts settle at a comfortable 17.1mph (27.5km/h), closing the year with a gentle breeze. Though relatively chillier, December's mild transition into winter maintains the tropical charm, ensuring a beautiful year-end.Temperature
With the onset of December, Hana's average high-temperature clocks in at a still warm 74.5°F (23.6°C), showing a minor fluctuation from the previous month. Hana reports an average low temperature of 72°F (22.2°C) in December, a minor decrease from the day's highs.Humidity
The average relative humidity in December is 77%.Rainfall
In Hana, in December, during 13.8 rainfall days, 1.5" (38mm) of precipitation is typically accumulated. Throughout the year, there are 136.7 rainfall days, and 13.94" (354mm) of precipitation is accumulated.Snowfall
In Hana, snow does not fall in January through August, October through December.Ocean temperature
In Hana, the average seawater temperature in December is 76.6°F (24.8°C).Note: Individual cold sensitivities, influenced by sunshine, wind, and the ambient temperature, play a role in finding a swim in 76.6°F (24.8°C) water pleasant. (Olympic swimming events mandate water temperatures from 77°F (25°C) to 82.4°F (28°C).)
Daylight
With an average of 10h and 54min of daylight, December has the shortest days of the year.On the first day of December in Hana, Hawaii, sunrise is at 6:44 am and sunset at 5:42 pm. On the last day of the month, sunrise is at 7:00 am and sunset at 5:54 pm HST.
Sunshine
The month with the least sunshine is December, with an average of 6.7h of sunshine.UV index
January through August, October through December, with an average maximum UV index of 6, are months with the lowest UV index in Hana, Hawaii. A UV Index value of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for the ordinary person.Note: An average maximum UV index of 6 in December leads to these recommendations:
Steer clear of overexposure. Fair-skinned individuals can be scorched in less than 20 minutes. Avoid direct Sun exposure and stay in the shade between 10 a.m. and 4 p.m., a time when UV radiation is most intense, noting that not all shade structures offer full protection. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Heads up! UV intensity is amplified by reflections from water and sand.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Hana, HI
- Average high temperature in December: 74.5°F
The warmest month (with the highest average high temperature) is September (79°F).
The month with the lowest average high temperature is March (72.9°F).
- Average low temperature in December: 72°F
The month with the highest average low temperature is September (76.1°F).
The coldest month (with the lowest average low temperature) is March (69.8°F).
Average pressure in December
Hana, 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
Hana, HI
- Average wind speed in December: 12.4mph
The windiest month (with the highest average wind speed) is June (14.4mph).
The calmest month (with the lowest average wind speed) is January (10.9mph).
Average humidity in December
Hana, HI
- Average humidity in December: 77%
The months with the highest relative humidity are July and August (78%).
The months with the lowest relative humidity are January and February (76%).
Average rainfall in December
Hana, HI
- Average rainfall in December: 1.5"
The wettest month (with the highest rainfall) is October (2.17").
The driest month (with the least rainfall) is September (0.43").
Average rainfall days in December
Hana, HI
- Average rainfall days in December: 13.8 days
The month with the highest number of rainy days is March (14.1 days).
The month with the least rainy days is September (8.1 days).
Average snowfall days in December
Hana, HI
- Average snowfall days in December: 0 days
The month with the highest number of snowfall days is September (0.1 days).
The months with the least snowfall days are January, February, March, April, May, June, July, August, October, November and December (0 days).
Average sea temperature in December
Hana, HI
- Average sea temperature in December: 76.7°F
The best month for swimming (with the highest average sea temperature) is September (79.3°F).
The coldest month (with the lowest average sea temperature) is March (75.5°F).
Average daylight in December /
Average sunshine in December
Hana, 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 42min
The months with the most sunshine are June and July (Average sunshine: 11h and 18min).
The month with the least sunshine is December (Average sunshine: 6h and 42min).
Average sunshine days in December
Hana, HI
- Average sunshine days in December: 13.3 days
The month with the most sunshine days is January (16.8 days).
The month with the least sunshine days is November (11.2 days).
Average UV index in December
Hana, 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
Hana, HI
- Average cloud cover in December: 29
The month with the most cloud cover is March (Cloud cover 33).
The month with the least cloud cover is September (Cloud cover 23).
Average visibility in December
Hana, 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).
