December weather forecastSuperior, MT
December
Weather in December
The first month of the winter, December, is still a freezing cold month in Superior, Montana, with an average temperature fluctuating between 16.2°F (-8.8°C) and 28.9°F (-1.7°C).Temperature
With average temperatures fluctuating between a high of 28.9°F (-1.7°C) and a low of 16.2°F (-8.8°C), December stands out as the coldest month.Humidity
In Superior, the average relative humidity in December is 91%.Rainfall
In Superior, during December, the rain falls for 12.2 days and regularly aggregates up to 2.99" (76mm) of precipitation. Throughout the year, in Superior, there are 152.1 rainfall days, and 22.09" (561mm) of precipitation is accumulated.Snowfall
January through May, September through December are months with snowfall. In Superior, during December, snow falls for 20.4 days and regularly aggregates up to 13.35" (339mm) of snow. Throughout the year, there are 90.2 snowfall days, and 58.15" (1477mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 8h and 36min of daylight.On the first day of the month, sunrise is at 8:06 am and sunset at 4:51 pm. On the last day of December, sunrise is at 8:25 am and sunset at 4:59 pm MST.
Sunshine
The average sunshine in December is 3.8h.UV index
January, February, November and December, with an average maximum UV index of 1, are months with the lowest UV index. A UV Index reading of 2, and below, represents a low threat to health from unprotected exposure to Sun's UV rays for the average person.Note: In December, a daily UV index of 1 turns into the following recommendations:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. Avoiding the Sun during its peak radiation time around midday is a healthy practice. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Superior, MT
- Average high temperature in December: 28.9°F
The warmest months (with the highest average high temperature) are July and August (78.8°F).
The month with the lowest average high temperature is December (28.9°F).
- Average low temperature in December: 16.2°F
The month with the highest average low temperature is August (45.7°F).
The coldest month (with the lowest average low temperature) is December (16.2°F).
Average pressure in December
Superior, MT
- Average pressure in December: 30.17"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
Superior, MT
- Average wind speed in December: 4mph
The windiest month (with the highest average wind speed) is April (4.9mph).
The calmest month (with the lowest average wind speed) is December (4mph).
Average humidity in December
Superior, MT
- Average humidity in December: 91%
The month with the highest relative humidity is January (93%).
The months with the lowest relative humidity are July and August (53%).
Average rainfall in December
Superior, MT
- Average rainfall in December: 2.99"
The wettest month (with the highest rainfall) is January (3.11").
The driest month (with the least rainfall) is August (0.39").
Average rainfall days in December
Superior, MT
- Average rainfall days in December: 12.2 days
The month with the highest number of rainy days is March (19.9 days).
The month with the least rainy days is August (5.9 days).
Average snowfall in December
Superior, MT
- Average snowfall in December: 13.35"
The month with the highest snowfall is February (15.12").
The months with the least snowfall are June, July and August (0").
Average snowfall days in December
Superior, MT
- Average snowfall days in December: 20.4 days
The month with the highest number of snowfall days is December (20.4 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in December /
Average sunshine in December
Superior, MT
- Average daylight in December: 8h and 36min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in December: 3h and 48min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in December
Superior, MT
- Average sunshine days in December: 8.1 days
The months with the most sunshine days are July and August (23.3 days).
The month with the least sunshine days is March (5.8 days).
Average UV index in December
Superior, 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 January, February, November and December (UV index 1).
Average cloud cover in December
Superior, MT
- Average cloud cover in December: 63
The month with the most cloud cover is February (Cloud cover 66).
The months with the least cloud cover are July and August (Cloud cover 15).
Average visibility in December
Superior, MT
- Average visibility in December: 3mi
The months with the highest visibility are June, July, August and September (6mi).
The months with the lowest visibility are January, February and December (3mi).
