December weather forecastRoberts, MT
December
Weather in December
The first month of the winter, December, is still a freezing cold month in Roberts, Montana, with an average temperature varying between 30.7°F (-0.7°C) and 17.4°F (-8.1°C).Temperature
December, characterized by an average high temperature of 30.7°F (-0.7°C) and a low temperature of 17.4°F (-8.1°C), is generally the coldest month.Humidity
The average relative humidity in December is 74%.Rainfall
In Roberts, in December, it is raining for 6.2 days, with typically 0.63" (16mm) of accumulated precipitation. In Roberts, during the entire year, the rain falls for 108.1 days and collects up to 12.83" (326mm) of precipitation.Snowfall
Months with snowfall in Roberts are January through June, September through December. In Roberts, Montana, in December, snow falls for 9.6 days, with typically accumulated 4.72" (120mm) of snow. In Roberts, during the entire year, snow falls for 61.5 days and aggregates up to 41.77" (1061mm) of snow.Daylight
The month with the shortest days in Roberts, Montana, is December, with an average of 8h and 48min of daylight.On the first day of the month, sunrise is at 7:36 am and sunset at 4:35 pm. On the last day of December, in Roberts, sunrise is at 7:56 am and sunset at 4:43 pm MST.
Sunshine
In Roberts, Montana, the average sunshine in December is 6.4h.UV index
January through March, November and 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 hazard from unprotected exposure to Sun's UV rays for average individuals.Note: The UV index of 2 during December leads to these advisories:
Children, babies, and those with sensitive skin should always be shielded from long periods of sun exposure. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Roberts, MT
- Average high temperature in December: 30.7°F
The warmest month (with the highest average high temperature) is July (82.9°F).
The month with the lowest average high temperature is December (30.7°F).
- Average low temperature in December: 17.4°F
The months with the highest average low temperature are July and August (57.2°F).
The coldest month (with the lowest average low temperature) is February (16.7°F).
Average pressure in December
Roberts, MT
- Average pressure in December: 30.15"Hg
The months with the highest atmospheric pressure are January and December (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.88"Hg).
Average wind speed in December
Roberts, MT
- Average wind speed in December: 8.5mph
The windiest month (with the highest average wind speed) is January (8.7mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in December
Roberts, MT
- Average humidity in December: 74%
The month with the highest relative humidity is January (76%).
The month with the lowest relative humidity is August (41%).
Average rainfall in December
Roberts, MT
- Average rainfall in December: 0.63"
The wettest month (with the highest rainfall) is May (2.09").
The driest month (with the least rainfall) is January (0.51").
Average rainfall days in December
Roberts, MT
- Average rainfall days in December: 6.2 days
The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is February (4 days).
Average snowfall in December
Roberts, MT
- Average snowfall in December: 4.72"
The month with the highest snowfall is February (6.81").
The months with the least snowfall are July and August (0").
Average snowfall days in December
Roberts, MT
- Average snowfall days in December: 9.6 days
The month with the highest number of snowfall days is February (10.8 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in December /
Average sunshine in December
Roberts, 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 24min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The month with the least sunshine is February (Average sunshine: 6h and 12min).
Average sunshine days in December
Roberts, MT
- Average sunshine days in December: 19.7 days
The month with the most sunshine days is December (19.7 days).
The month with the least sunshine days is May (10.5 days).
Average UV index in December
Roberts, MT
- Average UV index in December: 2
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in December
Roberts, MT
- Average cloud cover in December: 33
The month with the most cloud cover is February (Cloud cover 38).
The months with the least cloud cover are July and August (Cloud cover 15).
Average visibility in December
Roberts, 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).
