Helena, Montana Climate by Month
Helena, Montana, United States
Warm summers and freezing winters, with little rain.
Warm summers and freezing winters, with little rain: that's Helena's climate in short. Expect highs of 85°F (29°C) in July and 31°F (0°C) in December, with the coldest nights (January) near 12°F (-11°C). It gets only 11 in (271 mm) of rain a year.
- Warmest month
- 85°F(29°C)
- Average high, July
- Coldest nights
- 12°F(-11°C)
- Average low, January
- Rain per year
- 11 in(271 mm)
- No clear rainy season
- Humidity
- 56%
- Sunniest: July
Best and worst months in Helena
Best for weatherJune and September are the best time for weather in Helena: highs near 74°F (23°C) and about 1.6 in (41 mm) of rain a month.
Least pleasantDecember and January are the least pleasant; January is the coldest, with highs of only 31°F (0°C).
Comfort combines how close the afternoon high is to 75°F (24°C) with how much rain falls and how humid it is. See where the weather is best in September.
Temperature and rain through the year
Highs and lows (°F)
Average highAverage low
Rain (in per month)
Helena weather by month
| Month | High | Low | Rain | Humidity | Sun |
|---|---|---|---|---|---|
| JanJanuary | 31°F(0°C) | 12°F(-11°C) | 0.4 in(11 mm) | 75% | 1.4 |
| FebFebruary | 35°F(2°C) | 14°F(-10°C) | 0.4 in(10 mm) | 66% | 2.4 |
| MarMarch | 47°F(8°C) | 24°F(-4°C) | 0.6 in(14 mm) | 57% | 3.8 |
| AprApril | 56°F(13°C) | 31°F(-1°C) | 0.9 in(23 mm) | 52% | 4.7 |
| MayMay | 66°F(19°C) | 40°F(4°C) | 1.7 in(43 mm) | 51% | 5.7 |
| JunJuneBest | 74°F(24°C) | 47°F(9°C) | 2.3 in(59 mm) | 49% | 6.1 |
| JulJuly | 85°F(29°C) | 53°F(12°C) | 1.1 in(28 mm) | 41% | 7.0 |
| AugAugust | 85°F(29°C) | 51°F(11°C) | 0.9 in(23 mm) | 39% | 6.0 |
| SepSeptemberBest | 74°F(23°C) | 43°F(6°C) | 0.9 in(22 mm) | 42% | 4.3 |
| OctOctober | 59°F(15°C) | 33°F(1°C) | 0.6 in(16 mm) | 57% | 2.6 |
| NovNovember | 43°F(6°C) | 22°F(-5°C) | 0.4 in(11 mm) | 65% | 1.6 |
| DecDecember | 31°F(0°C) | 13°F(-10°C) | 0.4 in(11 mm) | 74% | 1.2 |
1991–2020 averages. Sun is solar radiation in kWh/m² per day. Highlighted: the most comfortable months.
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