December weather forecastMissoula, MT
December
Weather in December
December welcomes the full effect of winter in Missoula, with temperatures venturing into the cold range. This month is starkly different from the slightly milder January, specifically in terms of lower daylight hours, less sunshine, and lower visibility. The substantial increase in relative humidity and cloud cover sets the backdrop for the holiday season's characteristic snowy landscape. December is characterized by shorter days, longer nights, and a significant upsurge in snowfall. Despite the colder weather, the spirit of winter is embodied in the month's lower temperatures ranging from 15.4°F (-9.2°C) to 28°F (-2.2°C).Temperature
The lowest temperatures in Missoula are recorded in December, with averages reaching a high of 28°F (-2.2°C) and a low of 15.4°F (-9.2°C).Humidity
In Missoula, the average relative humidity in December is 88%.Rainfall
The months with the least rainfall are July and December Rain falls for 6.9 days and accumulates 0.16" (4mm) of rain.Snowfall
Months with snowfall in Missoula are January through May, September through December. In December, it is snowing for 9 days. Throughout December, 1.02" (26mm) of snow is accumulated. Throughout the year, there are 44 snowfall days, and 8.07" (205mm) of snow is accumulated.Daylight
The month with the shortest days in Missoula is December, with an average of 8h and 36min of daylight.On the first day of December, sunrise is at 8:01 am and sunset at 4:49 pm. On the last day of the month, sunrise is at 8:21 am and sunset at 4:57 pm MST.
Sunshine
In Missoula, the average sunshine in December is 5h.UV index
February and December, with an average maximum UV index of 1, are months with the lowest UV index in Missoula. A UV Index of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for the average person.Note: A typical high UV index of 1 in December suggests the following recommendations:
Protection from prolonged sun exposure is necessary for babies, children, and individuals with sensitive skin. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Take heed! Reflection from the snow can almost amplify the Sun's UV radiation by double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Missoula, MT
- Average high temperature in December: 28°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is December (28°F).
- Average low temperature in December: 15.4°F
The month with the highest average low temperature is August (46.9°F).
The coldest month (with the lowest average low temperature) is December (15.4°F).
Average pressure in December
Missoula, MT
- Average pressure in December: 30.18"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in December
Missoula, MT
- Average wind speed in December: 4.3mph
The windiest month (with the highest average wind speed) is April (5mph).
The calmest month (with the lowest average wind speed) is August (4mph).
Average humidity in December
Missoula, MT
- Average humidity in December: 88%
The month with the highest relative humidity is January (90%).
The month with the lowest relative humidity is July (50%).
Average rainfall in December
Missoula, MT
- Average rainfall in December: 0.16"
The wettest month (with the highest rainfall) is April (0.47").
The driest months (with the least rainfall) are July and December (0.16").
Average rainfall days in December
Missoula, MT
- Average rainfall days in December: 6.9 days
The month with the highest number of rainy days is April (8.8 days).
The month with the least rainy days is August (3.3 days).
Average snowfall in December
Missoula, MT
- Average snowfall in December: 1.02"
The month with the highest snowfall is February (2.36").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Missoula, MT
- Average snowfall days in December: 9 days
The month with the highest number of snowfall days is December (9 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Missoula, MT
- Average daylight in December: 8h and 36min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in December: 5h and 0min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 4h and 54min).
Average sunshine days in December
Missoula, MT
- Average sunshine days in December: 22.1 days
The month with the most sunshine days is July (27 days).
The month with the least sunshine days is April (17.8 days).
Average UV index in December
Missoula, MT
- Average UV index in December: 1
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are February and December (UV index 1).
Average cloud cover in December
Missoula, MT
- Average cloud cover in December: 51
The month with the most cloud cover is February (Cloud cover 54).
The month with the least cloud cover is July (Cloud cover 14).
Average visibility in December
Missoula, MT
- Average visibility in December: 4mi
The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).
