Great Falls
Montana, USA
Long-term weather forecast
Long-term weather forecast
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December weather forecast and Climate
Great Falls, MT

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  • The average high temperature in December: 1.4°C

The warmest month (with the highest average high temperature) is July (28.6°C).
The month with the lowest average high temperature is December (1.4°C).

  • The average low temperature in December: -9.5°C

The month with the highest average low temperature is July (10.8°C).
Coldest months (with the lowest average low temperature) are January and December (-9.5°C).

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  • The average rainfall in December: 14mm

The wettest month (with the highest rainfall) is June (64.3mm).
The driest month (with the lowest rainfall) is February (11.9mm).

  • The average rainfall days in December: 7.5 days

Months with the highest number of rainy days are May and June (11.7 days).
The month with the lowest number of rainy days is October (6.6 days).

  • The average snowfall in December: 241.3mm

The month with the highest snowfall is March (302.3mm).
The month with the lowest snowfall is July (0mm).

  • The average snowfall days in December: 7.5 days

The month with the highest number of snowfall days is March (7.8 days).
The month with the lowest number of snowfall days is July (0 days).

  • The average daylight in December: 9h

The month with the longest days is June (Average daylight: 16h).
Months with shortest days are January, November and December (Average daylight: 9h).

  • The average sunshine in December: 3.4h

The month with most sunshine is July (Average sunshine: 12.2h).
The month with least sunshine is December (Average sunshine: 3.4h).

  • The average UV index in December: 1

Months with the highest UV index are June and July (UV index 8).
Months with the lowest UV index are January, November and December (UV index 1).

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