Average annual temperatures for Montana (7°C/45°F) are significantly below the average for United States (13°C/55°F).
Average annual rainfall for Montana (509mm/20 inches) is significantly below the average for United States (1,039mm/41 inches).
July is the hottest or warmest month in Montana, with an average maximum temperate of 29°C/84°F.
February is the coolest or coldest month in Montana, with an average minimum temperate of -11°C/12°F.
May is the wettest or most rainy month in Montana, with an average rainfall of 69mm/3 inches.
July is the driest or least rainy month in Montana, with an average rainfall of 25mm/1 inches.
Billings is the hottest or warmest place in Montana, with an average maximum temperate of 9°C/48°F.
Great Falls is the coldest place in Montana, with an average maximum temperate of 7°C/45°F.
Billings is the most rainy or wettest place in Montana, with an average annual rainfall of 445mm/18 inches.
Great Falls is the least rainy or driest place in Montana, with an average annual rainfall of 414mm/16 inches.
| Place | Min Temp | Max Temp | Avg Temp | Rainfall |
|---|---|---|---|---|
| Billings | 2 | 16 | 9 | 445 |
| Great Falls | 0 | 14 | 7 | 414 |
| Missoula | 1 | 14 | 8 | - |