Boulder, MT
Climate overview — based on NOAA 1991-2020 normals from BOULDER, MT US.
Year-round temperatures (°F)
Climate summary
Boulder has an annual average temperature of 42.6°F with about 10.8 inches of precipitation per year. The warmest month is July (average high 82.5°F), and the coldest is December (average low 11.5°F). June is typically the wettest month (2.30 in) and February the driest (0.19 in).
Best time to visit Boulder
Full guide →Climate change signal
All-time records →51 of 366 (13.9%) of Boulder'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.
| 1940s | 8 | |
| 1950s | 48 | |
| 1960s | 52 | |
| 1970s | 33 | |
| 1980s | 66 | |
| 1990s | 47 | |
| 2000s | 45 | |
| 2010s | 32 | |
| 2020s | 35 |
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 | 35.0°F | 11.9°F | 23.5°F | 0.28 in | — | 5 |
| February | 37.8°F | 14.0°F | 25.9°F | 0.19 in | — | 5 |
| March | 46.8°F | 20.8°F | 33.8°F | 0.40 in | — | 6 |
| April | 54.5°F | 27.0°F | 40.7°F | 0.78 in | — | 7 |
| May | 63.6°F | 35.3°F | 49.4°F | 1.86 in | — | 12 |
| June | 72.0°F | 42.5°F | 57.2°F | 2.30 in | — | 12 |
| July | 82.5°F | 48.3°F | 65.4°F | 1.38 in | — | 8 |
| August | 82.0°F | 46.2°F | 64.1°F | 1.12 in | — | 7 |
| September | 71.9°F | 38.1°F | 55.0°F | 1.10 in | — | 7 |
| October | 57.4°F | 27.7°F | 42.6°F | 0.64 in | — | 7 |
| November | 42.4°F | 18.6°F | 30.5°F | 0.48 in | — | 6 |
| December | 33.6°F | 11.5°F | 22.5°F | 0.27 in | — | 6 |
Climate twins of Boulder
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).