December weather forecastForsyth, MT
December
Weather in December
December, the first month of the winter in Forsyth, is also a subzero cold month, with an average temperature fluctuating between 30.2°F (-1°C) and 17.6°F (-8°C).Temperature
Forsyth's December weather shows a moderate shift in high-temperatures, falling from November's frosty 43°F (6.1°C) to a subzero cold 30.2°F (-1°C). In Forsyth, December nights cool down to an average of 17.6°F (-8°C).Humidity
In December, the average relative humidity is 76%.Rainfall
In Forsyth, in December, during 6.5 rainfall days, 0.67" (17mm) of precipitation is typically accumulated. Throughout the year, there are 121.7 rainfall days, and 13.23" (336mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In December, it is snowing for 11.6 days. Throughout December, 3.94" (100mm) of snow is accumulated. Throughout the year, there are 56.6 snowfall days, and 21.06" (535mm) of snow is accumulated.Daylight
The month with the shortest days is December, with an average of 8h and 42min of daylight.On the first day of December, sunrise is at 7:29 am and sunset at 4:22 pm. On the last day of the month, sunrise is at 7:49 am and sunset at 4:30 pm MST.
Sunshine
In Forsyth, the average sunshine in December is 5.4h.UV index
The month with the lowest UV index is December, with an average maximum UV index of 1. A UV Index of 2, and less, symbolizes a minimal health hazard from unsafe exposure to UV radiation for the ordinary person.Note: The maximum daily UV index of 1 in December converts into the following recommendations:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. Minimize direct exposure to the Sun during midday when its radiation is at its peak. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays. Observe! Snow reflection can nearly intensify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Forsyth, MT
- Average high temperature in December: 30.2°F
The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is January (29.7°F).
- Average low temperature in December: 17.6°F
The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (16.3°F).
Average pressure in December
Forsyth, MT
- Average pressure in December: 30.12"Hg
The months with the highest atmospheric pressure are January and February (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in December
Forsyth, MT
- Average wind speed in December: 9.8mph
The windiest month (with the highest average wind speed) is April (10.9mph).
The calmest month (with the lowest average wind speed) is August (8.9mph).
Average humidity in December
Forsyth, MT
- Average humidity in December: 76%
The month with the highest relative humidity is January (81%).
The month with the lowest relative humidity is August (38%).
Average rainfall in December
Forsyth, MT
- Average rainfall in December: 0.67"
The wettest month (with the highest rainfall) is May (2.05").
The driest month (with the least rainfall) is November (0.63").
Average rainfall days in December
Forsyth, MT
- Average rainfall days in December: 6.5 days
The month with the highest number of rainy days is May (15.1 days).
The months with the least rainy days are January, February and December (6.5 days).
Average snowfall in December
Forsyth, MT
- Average snowfall in December: 3.94"
The month with the highest snowfall is February (4.53").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Forsyth, MT
- Average snowfall days in December: 11.6 days
The month with the highest number of snowfall days is January (12.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Forsyth, 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 24min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 12min).
Average sunshine days in December
Forsyth, MT
- Average sunshine days in December: 15.7 days
The month with the most sunshine days is September (17.9 days).
The month with the least sunshine days is April (11.9 days).
Average UV index in December
Forsyth, MT
- Average UV index in December: 1
The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in December
Forsyth, MT
- Average cloud cover in December: 44
The month with the most cloud cover is February (Cloud cover 46).
The months with the least cloud cover are July and August (Cloud cover 15).
Average visibility in December
Forsyth, MT
- 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).
