Rapid City vs Casper Climate
85%matchRapid City vs Casper: a 85% climate match. Compared with Rapid City, Casper has the same winter lows and half the summer rain.
Rapid City gets 17 in (441 mm) of rain a year and Casper 11 in (274 mm). July is the warmest month in both, with highs of 87°F (30°C) in Rapid City and 89°F (32°C) in Casper.
Climate fingerprints: ring color = average temperature, thickness = rain. January at the top.
Month by month
Highs and lows (°F)
Rapid CityCaspersolid = high, dashed = low
Rain (in per month)
Rapid CityCasper
Monthly averages
| Month | High | Low | Rain | |||
|---|---|---|---|---|---|---|
| Rapid City | Casper | Rapid City | Casper | Rapid City | Casper | |
| Jan | 39°F(4°C) | 37°F(3°C) | 14°F(-10°C) | 15°F(-10°C) | 0.3 in(7 mm) | 0.4 in(11 mm) |
| Feb | 40°F(5°C) | 38°F(3°C) | 15°F(-9°C) | 15°F(-9°C) | 0.4 in(10 mm) | 0.6 in(15 mm) |
| Mar | 50°F(10°C) | 48°F(9°C) | 24°F(-5°C) | 24°F(-5°C) | 0.8 in(21 mm) | 0.8 in(20 mm) |
| Apr | 58°F(14°C) | 56°F(14°C) | 32°F(0°C) | 30°F(-1°C) | 2.0 in(50 mm) | 1.3 in(32 mm) |
| May | 67°F(20°C) | 67°F(19°C) | 43°F(6°C) | 39°F(4°C) | 3.4 in(86 mm) | 2.2 in(56 mm) |
| Jun | 78°F(26°C) | 79°F(26°C) | 52°F(11°C) | 48°F(9°C) | 3.1 in(80 mm) | 1.4 in(35 mm) |
| Jul | 87°F(30°C) | 89°F(32°C) | 59°F(15°C) | 55°F(13°C) | 2.2 in(55 mm) | 0.9 in(22 mm) |
| Aug | 85°F(30°C) | 87°F(31°C) | 57°F(14°C) | 54°F(12°C) | 1.9 in(49 mm) | 0.5 in(12 mm) |
| Sep | 77°F(25°C) | 77°F(25°C) | 47°F(8°C) | 45°F(7°C) | 1.1 in(29 mm) | 0.8 in(20 mm) |
| Oct | 62°F(17°C) | 61°F(16°C) | 34°F(1°C) | 34°F(1°C) | 1.4 in(36 mm) | 0.9 in(24 mm) |
| Nov | 49°F(9°C) | 47°F(9°C) | 23°F(-5°C) | 25°F(-4°C) | 0.4 in(10 mm) | 0.6 in(14 mm) |
| Dec | 41°F(5°C) | 37°F(3°C) | 16°F(-9°C) | 17°F(-8°C) | 0.3 in(8 mm) | 0.5 in(13 mm) |
1991–2020 averages, by calendar month.