December weather forecastNānākuli, HI
December
Weather in December
The weather in December in Nānākuli witnesses the staggering transformation from warm to colder months. The transition is gradual yet significant enough to be noticed by every resident. Rolling in with a drop in temperature, the lowest for the year at 71.8°F (22.1°C), December marks the beginning of the decline in temperature. Heading towards the new year, the temperature continues to stay low, providing a fresh and cool backdrop for the year-ending celebrations.Temperature
The beginning of December records an average high-temperature of a still moderately hot 76.6°F (24.8°C), marking a negligible difference from November's 79°F (26.1°C). Throughout December in Nānākuli, a minimal difference from peak daytime temperatures is noted, marking a steady low-temperature average of 71.8°F (22.1°C).Humidity
The most humid month is December, with an average relative humidity of 76%.Rainfall
In Nānākuli, during December, the rain falls for 15.5 days and regularly aggregates up to 1.46" (37mm) of precipitation. In Nānākuli, Hawaii, during the entire year, the rain falls for 196.3 days and collects up to 14.72" (374mm) of precipitation.Ocean temperature
In December, the average ocean temperature is 77.4°F (25.2°C).Note: For activities such as swimming and diving, temperatures between 77°F (25°C) and 84.2°F (29°C) are perceived as particularly pleasant and satisfying for prolonged periods without feeling uneasy.
Daylight
December has the shortest days of the year in Nānākuli, with an average of 10h and 54min of daylight.On the first day of December, sunrise is at 6:54 am and sunset at 5:49 pm. On the last day of the month, sunrise is at 7:10 am and sunset at 6:01 pm HST.
Sunshine
In December, the average sunshine is 6.7h.UV index
January through May, October through December, with an average maximum UV index of 6, are months with the lowest UV index in Nānākuli. A UV Index value of 6 to 7 symbolizes a high threat to health from exposure to the Sun's UV rays for the average person.Note: In December, the maximum UV index of 6 transforms into these recommendations:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. Seek shade and limit direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation. Keep in mind that shade structures like parasols or canopies do not offer complete sun protection. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Be cautious! Sand and water surfaces make the Sun's UV rays more potent.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Nānākuli, HI
- Average high temperature in December: 76.6°F
The warmest months (with the highest average high temperature) are August and September (81.7°F).
The month with the lowest average high temperature is February (75°F).
- Average low temperature in December: 71.8°F
The months with the highest average low temperature are August and September (75.9°F).
The coldest month (with the lowest average low temperature) is February (69.1°F).
Average pressure in December
Nānākuli, 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
Nānākuli, HI
- Average wind speed in December: 9.7mph
The windiest month (with the highest average wind speed) is July (11.6mph).
The calmest month (with the lowest average wind speed) is October (8.8mph).
Average humidity in December
Nānākuli, HI
- Average humidity in December: 76%
The month with the highest relative humidity is December (76%).
The months with the lowest relative humidity are January, April, May, June, August, September, October and November (74%).
Average rainfall in December
Nānākuli, HI
- Average rainfall in December: 1.46"
The wettest month (with the highest rainfall) is March (1.81").
The driest month (with the least rainfall) is July (0.67").
Average rainfall days in December
Nānākuli, HI
- Average rainfall days in December: 15.5 days
The month with the highest number of rainy days is September (18.9 days).
The month with the least rainy days is January (13.8 days).
Average sea temperature in December
Nānākuli, HI
- Average sea temperature in December: 77.3°F
The best month for swimming (with the highest average sea temperature) is September (80.6°F).
The coldest month (with the lowest average sea temperature) is March (75.7°F).
Average daylight in December /
Average sunshine in December
Nānākuli, 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 month with the most sunshine is June (Average sunshine: 10h and 48min).
The month with the least sunshine is November (Average sunshine: 6h and 36min).
Average sunshine days in December
Nānākuli, HI
- Average sunshine days in December: 8.8 days
The month with the most sunshine days is January (11.8 days).
The month with the least sunshine days is November (6.4 days).
Average UV index in December
Nānākuli, HI
- Average UV index in December: 6
The months with the highest UV index are June, July, August and September (UV index 7).
The months with the lowest UV index are January, February, March, April, May, October, November and December (UV index 6).
Average cloud cover in December
Nānākuli, HI
- Average cloud cover in December: 34
The month with the most cloud cover is March (Cloud cover 38).
The months with the least cloud cover are January and September (Cloud cover 32).
Average visibility in December
Nānākuli, 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).
