Helena, MT Weather & Climate Normals
Helena's real weather, in one number
Helena, MT scores 40/100 on this site's reading of NOAA's own 30-year normals: strongly seasonal. Comfortable weather is limited to a shorter window; summers, winters, or precipitation swing wide. 3 of the year's 12 months average between 55 and 75°F, the range this site counts as mild.
Helena's hottest and coldest months
Helena's hottest month is Jul, averaging 64°F; its coldest is Dec, averaging 21°F, a 42.6°F swing across the year, a middling gap by national standards.
Helena's weather across the year
| Month | Avg high | Avg low | Precip |
|---|---|---|---|
| Jan | 30°F | 13°F | 0.84in |
| Feb | 32°F | 13°F | 0.99in |
| Mar | 42°F | 19°F | 0.84in |
| Apr | 50°F | 26°F | 1.66in |
| May | 60°F | 35°F | 2.34in |
| Jun | 68°F | 42°F | 2.74in |
| Jul | 78°F | 49°F | 1.22in |
| Aug | 78°F | 47°F | 1.09in |
| Sep | 67°F | 39°F | 1.28in |
| Oct | 51°F | 30°F | 1.25in |
| Nov | 37°F | 20°F | 1.27in |
| Dec | 29°F | 13°F | 0.93in |
Jun, Jul, and Aug are the best time to see Helena at its mildest; the rest of the year, plan around Dec's cold.
Rain and snow in Helena
Over a typical year, Helena sees about 16.45in of precipitation a year across roughly 78 days with measurable rain or snow. That station has no snowfall reading, so none is shown rather than assumed.
Where Helena ranks
Helena ranks 4503 of 4876 US cities in this dataset for comfort score, and 13 of 19 within MT. About 34,729 people live there.
If you need tomorrow's forecast, not the 30-year average
Everything above is a 30-year average from Austin 1 W, MT US, 12.2 miles from Helena, not a prediction for any specific day.
More on how this is worked out
Why some cities show no snow or rain figure · How the comfort score is calculated