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Keystone, SD Climate
1991 to 2020 normals at Mt Rushmore Nmem, 1.9 mi from the center of Keystone, elevation 5311 ft.
Average weather by month
Select a month for daily normals and last year's weather
| Month | Range | High | Low | Precip. | Snow |
|---|---|---|---|---|---|
| January | 37° | 19° | 0.48 in | 7.2 in | |
| February | 36° | 18° | 0.76 in | 8.9 in | |
| March | 44° | 25° | 1.35 in | 9.6 in | |
| April | 50° | 32° | 2.62 in | 13.1 in | |
| May | 60° | 42° | 4.80 in | 1.5 in | |
| June | 71° | 52° | 3.58 in | 0.2 in | |
| July | 79° | 59° | 3.59 in | 0.0 in | |
| August | 78° | 58° | 2.29 in | 0.0 in | |
| September | 69° | 50° | 1.76 in | 0.9 in | |
| October | 55° | 37° | 1.80 in | 4.9 in | |
| November | 44° | 27° | 0.59 in | 6.4 in | |
| December | 37° | 20° | 0.50 in | 6.6 in | |
| Year | 55° | 24.12 in | 59.3 in |
Frequently asked questions
- What is the hottest month in Keystone, SD?
- July is the warmest month, with a normal high of 79°F at Mt Rushmore Nmem.
- What is the coldest month in Keystone, SD?
- February is the coldest month, with a normal low of 18°F.
- What is the wettest month in Keystone, SD?
- May has the most precipitation on average, about 4.80 inches.