Great Falls, MT Weather & Climate Normals
What a normal year in Great Falls actually looks like
On the 30-year record NOAA keeps for Great Falls, MT, the comfort score comes out to 45/100, strongly seasonal: Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. Only 4 months a year land in the 55–75°F range this site treats as mild.
How much Great Falls's weather actually swings
Average temperatures in Great Falls run from 27°F in Jan up to 70°F in Jul, a 43.2°F seasonal swing, a middling gap by national standards.
Great Falls, month by month
| Month | Avg high | Avg low | Precip |
|---|---|---|---|
| Jan | 37°F | 18°F | 0.61in |
| Feb | 39°F | 19°F | 0.58in |
| Mar | 48°F | 25°F | 0.63in |
| Apr | 58°F | 33°F | 1.79in |
| May | 67°F | 42°F | 2.66in |
| Jun | 75°F | 50°F | 2.74in |
| Jul | 86°F | 55°F | 1.34in |
| Aug | 84°F | 53°F | 1.3in |
| Sep | 73°F | 45°F | 1.39in |
| Oct | 59°F | 36°F | 1.13in |
| Nov | 45°F | 26°F | 0.7in |
| Dec | 37°F | 20°F | 0.56in |
If you're timing a visit, Jun, Jul, Aug, and Sep are Great Falls's mildest stretch; if you're moving there, you should plan around Jan's cold instead.
How wet Great Falls actually gets
Great Falls averages 15.43in of precipitation a year across roughly 89 days with measurable rain or snow; the nearest NOAA station does not record snowfall, so no snow figure is shown rather than guessed.
Great Falls against the rest of the country
Out of 4876 cities scored here, Great Falls comes in at 3236; within MT alone it ranks 2 of 19. Population is about 60,013.
Checking the actual forecast
These figures come from Great Falls 16st, MT US, the NOAA station 1.4 miles from Great Falls, averaged over 30 years, not tomorrow's forecast.
More on how this is worked out
Why some cities show no snow or rain figure · What a 30-year climate normal actually is