December weather forecastGreen River, UT
December
Weather in December
December, the first month of the winter in Green River, is still a cold month, with an average temperature varying between 37.9°F (3.3°C) and 23.4°F (-4.8°C).Temperature
With December's arrival, Green River's weather changes as the average high-temperature falls from a fresh 50.7°F (10.4°C) in November to an icy 37.9°F (3.3°C). In December, Green River reports a consistent average low-temperature of 23.4°F (-4.8°C) during the nights.Humidity
In Green River, the average relative humidity in December is 65%.Rainfall
In Green River, in December, it is raining for 4.7 days, with typically 0.47" (12mm) of accumulated precipitation. In Green River, during the entire year, the rain falls for 72.7 days and collects up to 5.28" (134mm) of precipitation.Snowfall
Months with snowfall are January through March, October through December. December is the month with the most snowfall. Snow falls for 4.5 days and accumulates 1.93" (49mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 30min of daylight.On the first day of the month, sunrise is at 7:21 am and sunset at 4:58 pm. On the last day of December, sunrise is at 7:39 am and sunset at 5:08 pm MST.
Sunshine
The average sunshine in December is 6.8h.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for ordinary individuals.Note: In December, the average maximum UV index of 2 translates into the following recommendations:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Prioritize a wide-brim hat for comprehensive sun defense for your face, neck, eyes, and ears. Mark this! Snow reflection can nearly double the UV radiation intensity from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Green River, UT
- Average high temperature in December: 37.9°F
The warmest month (with the highest average high temperature) is July (91°F).
The month with the lowest average high temperature is January (36.1°F).
- Average low temperature in December: 23.4°F
The month with the highest average low temperature is July (71.4°F).
The coldest month (with the lowest average low temperature) is January (21.2°F).
Average pressure in December
Green River, UT
- Average pressure in December: 30.19"Hg
The month with the highest atmospheric pressure is January (30.25"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in December
Green River, UT
- Average wind speed in December: 4mph
The windiest month (with the highest average wind speed) is April (7.8mph).
The calmest month (with the lowest average wind speed) is January (3.5mph).
Average humidity in December
Green River, UT
- Average humidity in December: 65%
The month with the highest relative humidity is January (74%).
The month with the lowest relative humidity is June (21%).
Average rainfall in December
Green River, UT
- Average rainfall in December: 0.47"
The wettest month (with the highest rainfall) is July (0.75").
The driest month (with the least rainfall) is April (0.24").
Average rainfall days in December
Green River, UT
- Average rainfall days in December: 4.7 days
The month with the highest number of rainy days is July (9.1 days).
The month with the least rainy days is November (3.8 days).
Average snowfall in December
Green River, UT
- Average snowfall in December: 1.93"
The month with the highest snowfall is December (1.93").
The months with the least snowfall are April, May, June, July, August and September (0").
Average snowfall days in December
Green River, UT
- Average snowfall days in December: 4.5 days
The month with the highest number of snowfall days is January (4.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Green River, UT
- Average daylight in December: 9h and 30min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in December: 6h and 48min
The month with the most sunshine is June (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 6h and 24min).
Average sunshine days in December
Green River, UT
- Average sunshine days in December: 23.3 days
The month with the most sunshine days is November (24.5 days).
The month with the least sunshine days is July (14.8 days).
Average UV index in December
Green River, UT
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Green River, UT
- Average cloud cover in December: 25
The month with the most cloud cover is January (Cloud cover 27).
The months with the least cloud cover are June and September (Cloud cover 10).
Average visibility in December
Green River, UT
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, May, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is January (5mi).
