Helena
The tables below display average monthly climate and weather indicators in Helena Montana.
Temperature by: Fahrenheit / Centigrade
| Helena Temperature |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
Annual |
| Avg. Temperature | 19.6 | 26.4 | 33.6 | 43.4 | 52.5 | 62.1 | 69.2 | 67.4 | 55.4 | 45.1 | 31.6 | 21.2 | 44.0 |
| Avg. Max Temperature | 29.6 | 36.9 | 44.8 | 56.1 | 65.4 | 75.8 | 85.0 | 83.2 | 69.8 | 58.5 | 42.4 | 31.3 | 56.6 |
| Avg. Min Temperature | 9.6 | 15.9 | 22.3 | 30.6 | 39.6 | 48.3 | 53.4 | 51.7 | 41.0 | 31.6 | 20.7 | 11.2 | 31.3 |
| Days with Max Temp of 90 F or Higher | 0.0 | 0.0 | 0.0 | 0.0 | < 0.5 | 2.0 | 8.0 | 8.0 | 1.0 | 0.0 | 0.0 | 0.0 | 19.0 |
| Days with Min Temp Below Freezing | 29.0 | 27.0 | 27.0 | 18.0 | 4.0 | < 0.5 | 0.0 | < 0.5 | 3.0 | 17.0 | 27.0 | 30.0 | 182 |
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| Helena Heating and Cooling |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
Annual |
| Heating Degree Days | 1407 | 1081 | 973 | 648 | 388 | 137 | 34.0 | 65.0 | 321 | 617 | 1002 | 1358 | 8031 |
| Cooling Degree Days | 0.0 | 0.0 | 0.0 | 0.0 | 0.0 | 50.0 | 164 | 139 | 33.0 | 0.0 | 0.0 | 0.0 | 386 |
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| Helena Precipitation |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
Annual |
| Precipitation (inches) | 0.6 | 0.4 | 0.7 | 1.0 | 1.8 | 1.9 | 1.1 | 1.3 | 1.2 | 0.6 | 0.5 | 0.6 | 11.6 |
| Days with Precipitation 0.01 inch or More | 8.0 | 6.0 | 8.0 | 8.0 | 11.0 | 11.0 | 8.0 | 8.0 | 6.0 | 6.0 | 7.0 | 8.0 | 96.0 |
| Monthly Snowfall (inches) | 8.6 | 6.1 | 7.4 | 4.9 | 1.4 | 0.1 | < 0.05 | 0.1 | 1.5 | 2.3 | 6.4 | 8.3 | 47.1 |
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| Other Helena Weather Indicators |
Jan |
Feb |
Mar |
Apr |
May |
Jun |
Jul |
Aug |
Sep |
Oct |
Nov |
Dec |
Annual |
| Average Wind Speed | 6.7 | 7.3 | 8.2 | 9.1 | 8.8 | 8.5 | 7.8 | 7.4 | 7.4 | 7.1 | 7.1 | 6.7 | 7.7 |
| Clear Days | 5.0 | 4.0 | 4.0 | 4.0 | 5.0 | 6.0 | 14.0 | 13.0 | 11.0 | 8.0 | 5.0 | 4.0 | 82.0 |
| Partly Cloudy Days | 6.0 | 7.0 | 8.0 | 9.0 | 10.0 | 11.0 | 11.0 | 11.0 | 9.0 | 9.0 | 7.0 | 7.0 | 104 |
| Cloudy Days | 20.0 | 17.0 | 19.0 | 18.0 | 16.0 | 13.0 | 6.0 | 7.0 | 11.0 | 14.0 | 18.0 | 20.0 | 179 |
| Percent of Possible Sunshine | 46.0 | 55.0 | 61.0 | 59.0 | 60.0 | 64.0 | 78.0 | 74.0 | 67.0 | 60.0 | 44.0 | 42.0 | 59.0 |
| Avg. Relative Humidity | 52.5 | 68.5 | 63.5 | 58.5 | 55.5 | 56.0 | 53.0 | 49.5 | 51.0 | 54.5 | 59.0 | 66.0 | 69.0 |
Weather information for other cities in Montana