Great Falls (MT) Weather and Climate: A Comprehensive Guide
The temperature in Great Falls can vary quite a bit throughout the year.
Temperatures can be warm during the warmest months,
and very cold during the cooler months.
It maintains fairly dry conditions year-round.
Let’s explore the climate details in depth to provide you with a complete overview.
Average maximum day and minimum night temperature
Visitors to Great Falls can expect significant temperature changes throughout the year. On average, daytime temperatures range from a comfortable 30°C in July to a very cold 2°C in December.
Nighttime temperatures can drop, with average lows reaching -9°C in December. Check out our detailed temperature page for more information.Temperature ranges by month
Precipitation and rainy days
Great Falls's climate is marked by below-average rain/snowfall, accumulating 387 mm of precipitation yearly. The seasons in Great Falls, bring significant changes in precipitation. The wettest month, May, receives moderate rainfall, with an average of 67 mm of precipitation. This rainfall is distributed across 12 rainy days. In contrast, the driest month, March, experiences much less snow/rainfall, totaling 15 mm over 7 snowy/rainy days. These distinct seasonal differences provide diverse experiences throughout the year. For more details, please visit our Great Falls Precipitation page.The mean monthly precipitation over the year, including rain, hail and snow
The average number of days each month with precipitation
Sunshine over the year
In Great Falls, summer days are longer and more sunny, with daily sunshine hours peaking at 12.5 hours in July. As the darker season arrives, the brightness of the sun becomes less. December sees a soft sun for only 3.6 hours per average day. Visit our detailed sunshine hours page for more information.Monthly hours of sunshine
Daily hours of sunshine
Average humidity
The relative humidity is moderate throughout the year in Great Falls.
The city experiences its highest humidity in January, reaching 63%. In July, the humidity drops to its lowest level at 37%. Explore our detailed page on humidity levels for further details.
Relative humidity over the year
Average wind speed
The mean wind speed varies between 3 m/s and 5 m/s throughout the year. It is lowest in July and highest during January, February, March, April, October, November and December.
The mean monthly wind speed over the year (meters per second)
partly cloudy and no rain partly cloudy and no rain clear and no rainForecast for Great Falls (MT)
12 m/s
5 m/s
6 m/s
The best time of year to visit Great Falls in the United States of America
During the months of June and September you are most likely to experience good weather with pleasant average temperatures that fall between 20°C and 26°C.Other facts from our historical weather data:
Yes, the months of January, February, March, November and December are very dry.
July has an average maximum temperature of 30°C and is the warmest month of the year.
The coldest month is December with an average maximum temperature of 2°C.
May tops the wettest month list with 67 mm of rainfall.
March is the driest month with 15 mm of precipitation.
July is the sunniest month with an average of 376 hours of sunshine.
No idea where to travel to this year? We have a tool that recommends destinations based on your ideal conditions. Find out where to go with our weather planner.
