Montana climate by month
January highs across Montana range from 23°F in West Yellowstone to 37°F in Billings; July highs from 78°F in Big Sky to 86°F in Billings. The most common best months across these cities are May, June, July.
Montana weather month by month
Average of the 6 Montana cities on this site, computed from NOAA's unrounded values (so it can differ by a degree from averaging the rounded city figures); individual cities differ, sometimes a lot.
| Month | High | Low | Wet days | Snow |
|---|---|---|---|---|
| January | 31°F | 13°F | 11 | 18.0 in |
| February | 35°F | 14°F | 10 | 13.7 in |
| March | 45°F | 21°F | 11 | 10.4 in |
| April | 53°F | 29°F | 11 | 5.5 in |
| May | 63°F | 37°F | 12 | 0.9 in |
| June | 72°F | 44°F | 12 | 0.06 in |
| July | 82°F | 49°F | 7 | 0.0 in |
| August | 82°F | 47°F | 7 | 0.06 in |
| September | 71°F | 40°F | 8 | 0.2 in |
| October | 55°F | 30°F | 9 | 3.0 in |
| November | 40°F | 21°F | 10 | 10.1 in |
| December | 31°F | 14°F | 11 | 19.5 in |
Regional differences
- Warmest winterBillings: January high 37°F
- Coolest summerBig Sky: July high 78°F
- Most wet daysBig Sky: 141 a year
- Fewest wet daysBillings: 97 a year
- Most snowWest Yellowstone: 177.2 in a year
Warmest and coolest Montana city each month
| Month | Warmest | Coolest | Best month for |
|---|---|---|---|
| January | Billings 37°F | West Yellowstone 23°F | – |
| February | Billings 41°F | West Yellowstone 28°F | – |
| March | Billings 51°F | West Yellowstone 38°F | – |
| April | Billings 59°F | West Yellowstone 47°F | – |
| May | Billings 68°F | Big Sky 58°F | 3 cities |
| June | Billings 77°F | Big Sky 67°F | 5 cities |
| July | Billings 86°F | Big Sky 78°F | 2 cities |
| August | Billings 85°F | Big Sky 77°F | 1 city |
| September | Billings 75°F | West Yellowstone 68°F | 1 city |
| October | Billings 60°F | West Yellowstone 51°F | – |
| November | Billings 47°F | West Yellowstone 34°F | – |
| December | Billings 37°F | West Yellowstone 23°F | – |
By normal daily high. "Best month for": how many of the 6 cities have it among their best months by our comfort score.
Frost and humidity across Montana
- Earliest typical last frostBillings: May 10
- Latest typical last frostWest Yellowstone: Jun 15
- Most muggy daysBillings: 0 a year
- Fewest muggy daysWhitefish: 0 a year
All Montana cities
| City | Jan high | Jul high | Wet days/yr | Snow/yr | Best months |
|---|---|---|---|---|---|
| Big Sky | 30°F | 78°F | 141 | – | Jun, Jul, Sep |
| Billings | 37°F | 86°F | 97 | 57.4 in | May |
| Great Falls | 35°F | 84°F | 98 | 66.1 in | Jun |
| Missoula | 32°F | 85°F | 124 | 43.0 in | May, Jun |
| West Yellowstone | 23°F | 79°F | 135 | 177.2 in | Jun, Jul, Aug |
| Whitefish | 31°F | 82°F | 132 | 63.1 in | May, Jun |