Rapid City vs Helena, Montana Climate
75%matchRapid City vs Helena: a 75% climate match. Compared with Rapid City, Helena has the same winter lows and less rain in summer.
Rapid City gets 17 in (441 mm) of rain a year and Helena 11 in (271 mm). July is the warmest month in both, with highs of 87°F (30°C) in Rapid City and 85°F (29°C) in Helena.
Climate fingerprints: ring color = average temperature, thickness = rain. January at the top.
Month by month
Highs and lows (°F)
Rapid CityHelenasolid = high, dashed = low
Rain (in per month)
Rapid CityHelena
Monthly averages
| Month | High | Low | Rain | |||
|---|---|---|---|---|---|---|
| Rapid City | Helena | Rapid City | Helena | Rapid City | Helena | |
| Jan | 39°F(4°C) | 31°F(0°C) | 14°F(-10°C) | 12°F(-11°C) | 0.3 in(7 mm) | 0.4 in(11 mm) |
| Feb | 40°F(5°C) | 35°F(2°C) | 15°F(-9°C) | 14°F(-10°C) | 0.4 in(10 mm) | 0.4 in(10 mm) |
| Mar | 50°F(10°C) | 47°F(8°C) | 24°F(-5°C) | 24°F(-4°C) | 0.8 in(21 mm) | 0.6 in(14 mm) |
| Apr | 58°F(14°C) | 56°F(13°C) | 32°F(0°C) | 31°F(-1°C) | 2.0 in(50 mm) | 0.9 in(23 mm) |
| May | 67°F(20°C) | 66°F(19°C) | 43°F(6°C) | 40°F(4°C) | 3.4 in(86 mm) | 1.7 in(43 mm) |
| Jun | 78°F(26°C) | 74°F(24°C) | 52°F(11°C) | 47°F(9°C) | 3.1 in(80 mm) | 2.3 in(59 mm) |
| Jul | 87°F(30°C) | 85°F(29°C) | 59°F(15°C) | 53°F(12°C) | 2.2 in(55 mm) | 1.1 in(28 mm) |
| Aug | 85°F(30°C) | 85°F(29°C) | 57°F(14°C) | 51°F(11°C) | 1.9 in(49 mm) | 0.9 in(23 mm) |
| Sep | 77°F(25°C) | 74°F(23°C) | 47°F(8°C) | 43°F(6°C) | 1.1 in(29 mm) | 0.9 in(22 mm) |
| Oct | 62°F(17°C) | 59°F(15°C) | 34°F(1°C) | 33°F(1°C) | 1.4 in(36 mm) | 0.6 in(16 mm) |
| Nov | 49°F(9°C) | 43°F(6°C) | 23°F(-5°C) | 22°F(-5°C) | 0.4 in(10 mm) | 0.4 in(11 mm) |
| Dec | 41°F(5°C) | 31°F(0°C) | 16°F(-9°C) | 13°F(-10°C) | 0.3 in(8 mm) | 0.4 in(11 mm) |
1991–2020 averages, by calendar month.