US Geography / US Weather / South Dakota Weather / Keystone |
| Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | |
| Avg. High | 34 | 38 | 44 | 52 | 61 | 72 | 78 | 78 | 68 | 58 | 44 | 36 |
| Avg. Low | 7 | 10 | 16 | 26 | 34 | 44 | 48 | 46 | 37 | 28 | 18 | 10 |
| Mean | 21 | 24 | 30 | 38 | 48 | 58 | 64 | 64 | 54 | 44 | 32 | 24 |
| Avg. Precip. | 0.3 in | 0.5 in | 0.9 in | 2.3 in | 3.5 in | 4.1 in | 3.3 in | 2.1 in | 1.5 in | 1.1 in | 0.5 in | 0.4 in |
Degrees in Fahrenheit
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