Westby, MT
Climate overview — based on NOAA 1991-2020 normals from WESTBY, MT US.
Year-round temperatures (°F)
Climate summary
Westby has an annual average temperature of 39.1°F with about 14.9 inches of precipitation per year. The warmest month is August (average high 80.0°F), and the coldest is January (average low -2.2°F). June is typically the wettest month (3.14 in) and February the driest (0.34 in).
Best time to visit Westby
Full guide →Climate change signal
All-time records →39 of 366 (10.7%) of Westby'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.
| 1930s | 31 | |
| 1940s | 47 | |
| 1950s | 28 | |
| 1960s | 37 | |
| 1970s | 34 | |
| 1980s | 62 | |
| 1990s | 37 | |
| 2000s | 38 | |
| 2010s | 29 | |
| 2020s | 23 |
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 | 19.5°F | -2.2°F | 8.7°F | 0.37 in | — | — |
| February | 23.5°F | 2.1°F | 12.8°F | 0.34 in | — | — |
| March | 35.7°F | 14.2°F | 25.0°F | 0.55 in | — | — |
| April | 52.6°F | 27.3°F | 39.9°F | 0.98 in | — | — |
| May | 65.3°F | 39.5°F | 52.4°F | 2.17 in | — | — |
| June | 73.1°F | 49.9°F | 61.5°F | 3.14 in | — | — |
| July | 79.9°F | 54.6°F | 67.3°F | 2.49 in | — | — |
| August | 80.0°F | 51.8°F | 65.9°F | 1.64 in | — | — |
| September | 69.6°F | 41.1°F | 55.4°F | 1.26 in | — | — |
| October | 53.5°F | 28.6°F | 41.0°F | 0.97 in | — | — |
| November | 36.1°F | 14.6°F | 25.4°F | 0.52 in | — | — |
| December | 23.7°F | 3.8°F | 13.7°F | 0.48 in | — | — |
Climate twins of Westby
Why these? →The most climatically similar US cities at least 140 miles away (by monthly temperature + precipitation pattern).