December weather forecastPoipu, HI
December
Weather in December
The end of the year witnesses another surge in rainfall to 2.2" (56mm), the highest monthly average for the whole year. As December approaches, declines are observable in temperature, daylight, and sunshine hours, marking the onset of winter. Gusts of wind and reductions in visibility give the month a thematic touch of winter. Maintaining a consistent UV index justifies the use of sunblock during the day. Remarkably, the pressure holds steady at 30.01" (762mm), closing the weather on a high note.Temperature
The transition from November to December sees an average high-temperature of a still warm 75.4°F (24.1°C), indicating a minor variance from the prior month. December's average low-temperature is a pleasant 71.8°F (22.1°C), reflecting a minor difference from the day's peak temperatures.Humidity
June through August, October and December, with an average relative humidity of 77%, are the most humid months.Rainfall
In December, in Poipu, the rain falls for 18.1 days. Throughout December, 2.2" (56mm) of precipitation is accumulated. In Poipu, during the entire year, the rain falls for 218.4 days and collects up to 22.13" (562mm) of precipitation.Daylight
The month with the shortest days is December, with an average of 10h and 48min of daylight.On the first day of December, sunrise is at 7:00 am and sunset at 5:53 pm. On the last day of the month, sunrise is at 7:16 am and sunset at 6:06 pm HST.
Sunshine
In December, the average sunshine is 6.4h.UV index
January through August, October through December, with an average maximum UV index of 6, are months with the lowest UV index in Poipu. A UV Index estimate of 6 to 7 represents a high threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The daily high UV index of 6 in December translates into this advice:
Guard oneself from overexposure. Defence against sun injury is vital. Make an effort to avoid direct sun exposure between 10 a.m. and 4 p.m., the peak period for UV radiation, and note that objects like parasols or canopies might not offer full sun protection. Consider a wide-brim hat essential for effective sun defense covering your face, neck, and eyes.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Poipu, HI
- Average high temperature in December: 75.4°F
The warmest month (with the highest average high temperature) is September (79.7°F).
The months with the lowest average high temperature are February and March (73.2°F).
- Average low temperature in December: 71.8°F
The month with the highest average low temperature is September (75.9°F).
The coldest month (with the lowest average low temperature) is February (68.5°F).
Average pressure in December
Poipu, HI
- Average pressure in December: 30.01"Hg
The month with the highest atmospheric pressure is April (30.07"Hg).
The months with the lowest atmospheric pressure are September and October (29.98"Hg).
Average wind speed in December
Poipu, HI
- Average wind speed in December: 11.2mph
The windiest month (with the highest average wind speed) is July (12.3mph).
The calmest month (with the lowest average wind speed) is January (10mph).
Average humidity in December
Poipu, HI
- Average humidity in December: 77%
The months with the highest relative humidity are June, July, August, October and December (77%).
The month with the lowest relative humidity is January (75%).
Average rainfall in December
Poipu, HI
- Average rainfall in December: 2.2"
The wettest month (with the highest rainfall) is March (2.52").
The driest month (with the least rainfall) is April (1.3").
Average rainfall days in December
Poipu, HI
- Average rainfall days in December: 18.1 days
The month with the highest number of rainy days is August (21.1 days).
The month with the least rainy days is January (12.5 days).
Average daylight in December /
Average sunshine in December
Poipu, HI
- Average daylight in December: 10h and 48min
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 48min).
- Average sunshine in December: 6h and 24min
The month with the most sunshine is June (Average sunshine: 9h and 42min).
The month with the least sunshine is November (Average sunshine: 6h and 12min).
Average sunshine days in December
Poipu, HI
- Average sunshine days in December: 6.7 days
The month with the most sunshine days is January (12.8 days).
The month with the least sunshine days is August (2.9 days).
Average UV index in December
Poipu, 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
Poipu, HI
- Average cloud cover in December: 42
The month with the most cloud cover is March (Cloud cover 47).
The months with the least cloud cover are January and September (Cloud cover 38).
Average visibility in December
Poipu, 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).
