December weather forecastVolcano, HI
December
Weather in December
Wrapping up the year, December brings with it a tropical twist. A slight increase in rainfall to 2.64" (67mm) sets the tone for a green winter in Volcano, Hawaii. Consequently, the temperature highs decrease, heralding the arrival of the tropical winter phase. Wind speeds round off at the lower end of the year's spectrum offering calm, pleasant evenings. The pressure remains consistent with the preceding months, the cloud cover increases slightly, and daylight hours reduce further, attesting to the close of fall and the onset of winter.Temperature
Volcano indicates an average high-temperature of a still pleasant 71.6°F (22°C) in December, showing minor variation from November's 72.9°F (22.7°C). An average low-temperature of 66.4°F (19.1°C) is witnessed throughout the month of December in Volcano, a mere drop from the daytime peak.Humidity
In Volcano, the average relative humidity in December is 79%.Rainfall
In Volcano, during December, the rain falls for 18.4 days and regularly aggregates up to 2.64" (67mm) of precipitation. 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 in Volcano, Hawaii, with an average of 11h and 0min of daylight.On the first day of December in Volcano, sunrise is at 6:39 am and sunset at 5:41 pm. On the last day of the month, sunrise is at 6:54 am and sunset at 5:53 pm HST.
Sunshine
December has the least sunshine of the year in Volcano, with an average of 6.5h of sunshine.UV index
May through December, with an average maximum UV index of 6, are months with the highest UV index. A UV Index estimate of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: The average daily UV index of 6 in December transforms into the following instructions:
Fend off overexposure. Sun protection is vital. Avoid direct sunlight between the hours of 10 a.m. and 4 p.m., when UV radiation is at its peak. Keep in mind that shade structures may not provide complete protection. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Volcano, 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
Volcano, 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
Volcano, 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
Volcano, 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
Volcano, 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
Volcano, 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
Volcano, 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
Volcano, 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
Volcano, 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
Volcano, 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
Volcano, 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).
