Great Falls, MT
Climate overview — based on NOAA 1991-2020 normals from GREAT FALLS 16ST, MT US.
Year-round temperatures (°F)
Climate summary
Great Falls has an annual average temperature of 47°F with about 15.4 inches of precipitation per year. The warmest month is July (average high 85.8°F), and the coldest is January (average low 17.5°F). June is typically the wettest month (2.74 in) and December the driest (0.56 in).
Best time to visit Great Falls
Full guide →Climate change signal
All-time records →48 of 366 (13.1%) of Great Falls's all-time daily heat records have been set since 2015. If records were spread evenly across the station's history, only about 5% would fall in any given decade.
| 1890s | 53 | |
| 1900s | 17 | |
| 1910s | 66 | |
| 1920s | 34 | |
| 1930s | 71 | |
| 1950s | 36 | |
| 2000s | 22 | |
| 2010s | 53 | |
| 2020s | 14 |
Bars: number of all-time daily heat records still standing that were set in each decade.
Monthly averages
| Month | Avg High | Avg Low | Avg Temp | Precipitation | Snow | Rainy days |
|---|---|---|---|---|---|---|
| January | 36.8°F | 17.5°F | 27.2°F | 0.61 in | — | 6 |
| February | 38.6°F | 18.7°F | 28.7°F | 0.58 in | — | 9 |
| March | 48.2°F | 25.2°F | 36.7°F | 0.63 in | — | 6 |
| April | 58.3°F | 33.2°F | 45.7°F | 1.79 in | — | 9 |
| May | 67.0°F | 41.9°F | 54.4°F | 2.66 in | — | 11 |
| June | 75.4°F | 49.6°F | 62.5°F | 2.74 in | — | 9 |
| July | 85.8°F | 55.0°F | 70.4°F | 1.34 in | — | 6 |
| August | 83.9°F | 53.4°F | 68.7°F | 1.30 in | — | 6 |
| September | 72.6°F | 44.7°F | 58.6°F | 1.39 in | — | 7 |
| October | 59.1°F | 35.9°F | 47.5°F | 1.13 in | — | 7 |
| November | 45.3°F | 26.0°F | 35.7°F | 0.70 in | — | 6 |
| December | 36.7°F | 19.8°F | 28.3°F | 0.56 in | — | 7 |
Climate twins of Great Falls
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).