December weather forecastRiverton, WY
December
Weather in December
December brings the full force of winter to Riverton with temperatures plunging to as low as 14.7°F (-9.6°C). The snow-covered landscapes characterized by this month are postcard-worthy, creating an awe-inspiring winter wonderland. As the winds whistle their winter tune, they carry occasional snowfall that blankets the cityscape. The considerably shorter daylight hours and reduced sunlight further add to the stark winter ambiance in December. It may be severe and crippling at times, but December carries the unique charm of holiday spirit and wintry enchantment.Temperature
December, characterized by an average high temperature of 30.9°F (-0.6°C) and a low temperature of 14.7°F (-9.6°C), is generally the coldest month.Humidity
In Riverton, the average relative humidity in December is 72%.Rainfall
In December, the rain falls for 3.1 days. Throughout December, 0.31" (8mm) of precipitation is accumulated. Throughout the year, there are 67.3 rainfall days, and 6.93" (176mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, September through December. In Riverton, during December, snow falls for 6.7 days and regularly aggregates up to 2.24" (57mm) of snow. In Riverton, during the entire year, snow falls for 42.8 days and aggregates up to 25.47" (647mm) of snow.Daylight
With an average of 9h and 6min of daylight, December has the shortest days of the year in Riverton.On the first day of December, sunrise is at 7:25 am and sunset at 4:39 pm. On the last day of the month, sunrise is at 7:44 am and sunset at 4:48 pm MST.
Sunshine
In December, the average sunshine is 6.7h.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 estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: The maximum UV index, 2 during December, leads to the following recommendations:
While sun exposure does not greatly affect most, individuals with fair skin, babies, and children always need vigilant safeguarding. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. Tightly woven clothing, when worn loosely, shields effectively against the Sun. Note well! The intensity of the Sun's UV rays can be nearly doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Riverton, WY
- Average high temperature in December: 30.9°F
The warmest month (with the highest average high temperature) is July (87.1°F).
The month with the lowest average high temperature is December (30.9°F).
- Average low temperature in December: 14.7°F
The month with the highest average low temperature is July (61.5°F).
The coldest month (with the lowest average low temperature) is January (14.5°F).
Average pressure in December
Riverton, WY
- Average pressure in December: 30.2"Hg
The month with the highest atmospheric pressure is January (30.22"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in December
Riverton, WY
- Average wind speed in December: 5.7mph
The windiest month (with the highest average wind speed) is June (7.5mph).
The calmest month (with the lowest average wind speed) is January (5.5mph).
Average humidity in December
Riverton, WY
- Average humidity in December: 72%
The month with the highest relative humidity is January (77%).
The months with the lowest relative humidity are July and August (31%).
Average rainfall in December
Riverton, WY
- Average rainfall in December: 0.31"
The wettest month (with the highest rainfall) is May (1.42").
The driest month (with the least rainfall) is January (0.24").
Average rainfall days in December
Riverton, WY
- Average rainfall days in December: 3.1 days
The month with the highest number of rainy days is May (9.9 days).
The month with the least rainy days is January (2.5 days).
Average snowfall in December
Riverton, WY
- Average snowfall in December: 2.24"
The month with the highest snowfall is April (5.39").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Riverton, WY
- Average snowfall days in December: 6.7 days
The month with the highest number of snowfall days is February (7.8 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
Riverton, WY
- Average daylight in December: 9h and 6min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in December: 6h and 42min
The month with the most sunshine is July (Average sunshine: 12h and 0min).
The month with the least sunshine is January (Average sunshine: 6h and 36min).
Average sunshine days in December
Riverton, WY
- Average sunshine days in December: 23.5 days
The month with the most sunshine days is January (24.5 days).
The month with the least sunshine days is April (15.5 days).
Average UV index in December
Riverton, WY
- Average UV index in December: 2
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in December
Riverton, WY
- Average cloud cover in December: 26
The months with the most cloud cover are February and April (Cloud cover 28).
The months with the least cloud cover are July and August (Cloud cover 12).
Average visibility in December
Riverton, WY
- 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).
