December weather forecastAlder, MT
December
Weather in December
The first month of the winter, December, is also a subzero cold month in Alder, Montana, with an average temperature varying between 26.4°F (-3.1°C) and 11.3°F (-11.5°C).Temperature
Temperature readings reach their annual highs in December, averaging 26.4°F (-3.1°C) and a minimum average of 11.3°F (-11.5°C).Humidity
The average relative humidity in December in Alder, Montana, is 84%.Rainfall
In Alder, in December, during 11.9 rainfall days, 0.71" (18mm) of precipitation is typically accumulated. In Alder, during the entire year, the rain falls for 158 days and collects up to 12.2" (310mm) of precipitation.Snowfall
January through April, October through December are months with snowfall in Alder. In December, it is snowing for 4.5 days. Throughout December, 0.87" (22mm) of snow is accumulated. In Alder, during the entire year, snow falls for 20.8 days and aggregates up to 5.12" (130mm) of snow.Daylight
With an average of 8h and 48min of daylight, December has the shortest days of the year in Alder, Montana.On the first day of December, sunrise is at 7:48 am and sunset at 4:47 pm. On the last day of the month, sunrise is at 8:07 am and sunset at 4:55 pm MST.
Sunshine
The month with the least sunshine is December, with an average of 6h of sunshine.UV index
The months with the lowest UV index are January through April, October through December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: The UV index of 2 in December translates into these instructions:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. 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
Alder, MT
- Average high temperature in December: 26.4°F
The warmest month (with the highest average high temperature) is July (79.5°F).
The month with the lowest average high temperature is December (26.4°F).
- Average low temperature in December: 11.3°F
The month with the highest average low temperature is July (47.7°F).
The coldest month (with the lowest average low temperature) is December (11.3°F).
Average pressure in December
Alder, MT
- Average pressure in December: 30.22"Hg
The month with the highest atmospheric pressure is January (30.23"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in December
Alder, MT
- Average wind speed in December: 6.1mph
The windiest month (with the highest average wind speed) is November (6.3mph).
The calmest month (with the lowest average wind speed) is August (4.6mph).
Average humidity in December
Alder, MT
- Average humidity in December: 84%
The month with the highest relative humidity is January (85%).
The months with the lowest relative humidity are July and August (46%).
Average rainfall in December
Alder, MT
- Average rainfall in December: 0.71"
The wettest month (with the highest rainfall) is May (1.85").
The driest month (with the least rainfall) is January (0.59").
Average rainfall days in December
Alder, MT
- Average rainfall days in December: 11.9 days
The month with the highest number of rainy days is April (18.6 days).
The month with the least rainy days is August (8.6 days).
Average snowfall in December
Alder, MT
- Average snowfall in December: 0.87"
The month with the highest snowfall is February (1.81").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in December
Alder, MT
- Average snowfall days in December: 4.5 days
The month with the highest number of snowfall days is February (6.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Alder, MT
- Average daylight in December: 8h and 48min
The month with the longest days is June (Average daylight: 15h and 36min).
The month with the shortest days is December (Average daylight: 8h and 48min).
- Average sunshine in December: 6h and 0min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is December (Average sunshine: 6h and 0min).
Average sunshine days in December
Alder, MT
- Average sunshine days in December: 14.8 days
The month with the most sunshine days is July (17.8 days).
The month with the least sunshine days is April (7.8 days).
Average UV index in December
Alder, MT
- Average UV index in December: 2
The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 2).
Average cloud cover in December
Alder, MT
- Average cloud cover in December: 40
The month with the most cloud cover is February (Cloud cover 42).
The months with the least cloud cover are July and August (Cloud cover 14).
Average visibility in December
Alder, MT
- Average visibility in December: 5mi
The months with the highest visibility are March, April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February and December (5mi).
