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Historical Helena Weather Data
| Record High Temp (°F) |
Normal High Temp (°F) |
Normal Low Temp (°F) |
Record Low Temp (°F) |
Normal Monthly Precipitation (in.) |
Normal Monthly Snowfall (in.) |
|
|---|---|---|---|---|---|---|
| January | 72 | 30.5 | 9.9 | -42 | 0.52 | 8.5 |
| February | 69 | 37.3 | 15.6 | -42 | 0.38 | 6 |
| March | 78 | 46.8 | 23.5 | -30 | 0.63 | 7.4 |
| April | 86 | 56.9 | 31.2 | 1 | 0.91 | 4.9 |
| May | 93 | 65.9 | 39.8 | 17 | 1.78 | 1.4 |
| June | 100 | 75 | 47.5 | 30 | 1.82 | 0.1 |
| July | 105 | 83.4 | 52.3 | 36 | 1.34 | T |
| August | 105 | 82.5 | 50.8 | 28 | 1.29 | 0.1 |
| September | 99 | 71 | 41.2 | 18 | 1.05 | 1.5 |
| October | 87 | 58.4 | 31.2 | -8 | 0.66 | 2.3 |
| November | 75 | 41.5 | 20.3 | -39 | 0.48 | 6.3 |
| December | 64 | 31.5 | 11.3 | -38 | 0.46 | 8.3 |
