Chinook, MT
Climate overview — based on NOAA 1991-2020 normals from CHINOOK, MT US.
Year-round temperatures (°F)
Climate summary
Chinook has an annual average temperature of 42.4°F with about 13.4 inches of precipitation per year. The warmest month is July (average high 84.3°F), and the coldest is January (average low 4.2°F). June is typically the wettest month (2.86 in) and February the driest (0.37 in).
Best time to visit Chinook
Full guide →Climate change signal
All-time records →30 of 366 (8.2%) of Chinook'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 | 12 | |
| 1900s | 26 | |
| 1910s | 39 | |
| 1920s | 27 | |
| 1930s | 60 | |
| 1940s | 20 | |
| 1950s | 19 | |
| 1960s | 29 | |
| 1970s | 5 | |
| 1980s | 32 | |
| 1990s | 40 | |
| 2000s | 24 | |
| 2010s | 18 | |
| 2020s | 15 |
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 | 27.1°F | 4.2°F | 15.7°F | 0.45 in | — | 5 |
| February | 31.4°F | 6.9°F | 19.2°F | 0.37 in | — | 5 |
| March | 43.0°F | 17.7°F | 30.4°F | 0.59 in | — | 5 |
| April | 56.9°F | 29.4°F | 43.1°F | 1.04 in | — | 6 |
| May | 67.0°F | 40.0°F | 53.5°F | 2.42 in | — | 10 |
| June | 75.4°F | 49.3°F | 62.4°F | 2.86 in | — | 11 |
| July | 84.3°F | 53.6°F | 69.0°F | 1.62 in | — | 7 |
| August | 83.3°F | 51.7°F | 67.5°F | 1.14 in | — | 5 |
| September | 72.3°F | 41.2°F | 56.8°F | 0.99 in | — | 7 |
| October | 56.9°F | 28.5°F | 42.7°F | 0.88 in | — | 6 |
| November | 41.3°F | 17.0°F | 29.2°F | 0.69 in | — | 6 |
| December | 30.5°F | 7.5°F | 19.0°F | 0.39 in | — | 5 |
Climate twins of Chinook
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).