December weather forecastJefferson City, MT
December
Weather in December
December, the first month of the winter in Jefferson City, is still a freezing cold month, with an average temperature fluctuating between 27°F (-2.8°C) and 12.6°F (-10.8°C).Temperature
December, recording an average high temperature of 27°F (-2.8°C) and a low temperature of 12.6°F (-10.8°C), is Jefferson City's coldest month.Humidity
In Jefferson City, the average relative humidity in December is 84%.Rainfall
December is the month with the least rainfall. Rain falls for 8.2 days and accumulates 0.79" (20mm) of precipitation.Snowfall
Months with snowfall are January through June, September through December. In Jefferson City, Montana, in December, during 16.8 snowfall days, 6.22" (158mm) of snow is typically accumulated. Throughout the year, there are 105.8 snowfall days, and 55.12" (1400mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 8h and 42min of daylight.On the first day of December, sunrise is at 7:51 am and sunset at 4:43 pm. On the last day of the month, sunrise is at 8:11 am and sunset at 4:51 pm MST.
Sunshine
January and December, with an average of 5.6h of sunshine, are months with the least sunshine in Jefferson City.UV index
In December, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In December, an average UV index of 2 transforms into the following instructions:
Extended exposure to the sun should always be avoided by children, infants, and those with sensitive skin. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Watch out! The Sun's UV radiation can be nearly magnified twofold due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Jefferson City, MT
- Average high temperature in December: 27°F
The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is December (27°F).
- Average low temperature in December: 12.6°F
The month with the highest average low temperature is August (48.6°F).
The coldest month (with the lowest average low temperature) is December (12.6°F).
Average pressure in December
Jefferson City, 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 (29.91"Hg).
Average wind speed in December
Jefferson City, MT
- Average wind speed in December: 6.4mph
The windiest months (with the highest average wind speed) are January and November (6.5mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in December
Jefferson City, MT
- Average humidity in December: 84%
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is August (46%).
Average rainfall in December
Jefferson City, MT
- Average rainfall in December: 0.79"
The wettest month (with the highest rainfall) is June (2.68").
The driest month (with the least rainfall) is December (0.79").
Average rainfall days in December
Jefferson City, MT
- Average rainfall days in December: 8.2 days
The month with the highest number of rainy days is May (18.2 days).
The month with the least rainy days is November (7.5 days).
Average snowfall in December
Jefferson City, MT
- Average snowfall in December: 6.22"
The month with the highest snowfall is February (9.72").
The months with the least snowfall are July and August (0").
Average snowfall days in December
Jefferson City, MT
- Average snowfall days in December: 16.8 days
The month with the highest number of snowfall days is February (18 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
Jefferson City, MT
- Average daylight in December: 8h and 42min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in December: 5h and 36min
The month with the most sunshine is July (Average sunshine: 11h and 42min).
The months with the least sunshine are January and December (Average sunshine: 5h and 36min).
Average sunshine days in December
Jefferson City, MT
- Average sunshine days in December: 13.7 days
The month with the most sunshine days is September (17.9 days).
The month with the least sunshine days is February (8.5 days).
Average UV index in December
Jefferson City, MT
- Average UV index in December: 2
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in December
Jefferson City, MT
- Average cloud cover in December: 44
The month with the most cloud cover is February (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 15).
Average visibility in December
Jefferson City, MT
- Average visibility in December: 5mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March and December (5mi).
