December weather forecastMills, WY
December
Weather in December
In December, Mills is in the throes of winter, the landscape often covered by an average snowfall amount of 3.7" (94mm). The temperatures hardly rise above the freezing mark, rendering the city a frosty wonderland. The cold, crisp air coupled with the stark canvas of white evokes an undeniable allure. Short days and long nights dominate this month, creating idyllic settings for warm indoor activities. As the year comes to an end, December wraps Mills in a tranquil winter blanket, marking the cyclical completion of weather patterns.Temperature
With average temperatures fluctuating between a high of 28.4°F (-2°C) and a low of 15.1°F (-9.4°C), December stands out as the coldest month.Humidity
In Mills, the average relative humidity in December is 77%.Rainfall
In Mills, Wyoming, during December, the rain falls for 4.1 days and regularly aggregates up to 0.51" (13mm) of precipitation. In Mills, during the entire year, the rain falls for 91.6 days and collects up to 9.69" (246mm) of precipitation.Snowfall
January through May, September through December are months with snowfall. In December, it is snowing for 9.9 days. Throughout December, 3.7" (94mm) of snow is accumulated. In Mills, Wyoming, during the entire year, snow falls for 61.5 days and aggregates up to 32.13" (816mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 6min of daylight.On the first day of December, sunrise is at 7:17 am and sunset at 4:32 pm. On the last day of the month, sunrise is at 7:36 am and sunset at 4:41 pm MST.
Sunshine
In December, the average sunshine is 6.4h.UV index
January through April, October through 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 minimal health vulnerability from exposure to the Sun's UV radiation for average individuals.Note: The UV index of 2 in December translates into these instructions:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Mills, WY
- Average high temperature in December: 28.4°F
The warmest month (with the highest average high temperature) is July (83.5°F).
The month with the lowest average high temperature is December (28.4°F).
- Average low temperature in December: 15.1°F
The month with the highest average low temperature is July (59.5°F).
The coldest month (with the lowest average low temperature) is December (15.1°F).
Average pressure in December
Mills, WY
- Average pressure in December: 30.15"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in December
Mills, WY
- Average wind speed in December: 11.7mph
The windiest month (with the highest average wind speed) is January (12.1mph).
The calmest months (with the lowest average wind speed) are July and August (8.5mph).
Average humidity in December
Mills, WY
- Average humidity in December: 77%
The month with the highest relative humidity is January (79%).
The month with the lowest relative humidity is August (37%).
Average rainfall in December
Mills, WY
- Average rainfall in December: 0.51"
The wettest month (with the highest rainfall) is May (1.77").
The driest months (with the least rainfall) are January, August and September (0.43").
Average rainfall days in December
Mills, WY
- Average rainfall days in December: 4.1 days
The month with the highest number of rainy days is May (14.1 days).
The month with the least rainy days is January (3.6 days).
Average snowfall in December
Mills, WY
- Average snowfall in December: 3.7"
The month with the highest snowfall is November (5.47").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Mills, WY
- Average snowfall days in December: 9.9 days
The month with the highest number of snowfall days is February (11.2 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Mills, 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 24min
The months with the most sunshine are July and August (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 6h and 6min).
Average sunshine days in December
Mills, WY
- Average sunshine days in December: 20.5 days
The month with the most sunshine days is December (20.5 days).
The month with the least sunshine days is May (11.9 days).
Average UV index in December
Mills, WY
- Average UV index in December: 2
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).
Average cloud cover in December
Mills, WY
- Average cloud cover in December: 32
The month with the most cloud cover is February (Cloud cover 36).
The month with the least cloud cover is August (Cloud cover 13).
Average visibility in December
Mills, 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).
