April weather in Keystone, SD
The average temperature in Keystone in April is 41.0°F (31.8°F–50.2°F). Average precipitation: 2.62 inches. Average snowfall is 13.1 inches.
April is a spring month in Keystone, and is cooler than the annual average of 45.7°F. Daily temperatures swing about 18.4°F between overnight low and afternoon high. Expect about 10 days with precipitation. Daylight averages about 13h 13m. For travel, April is cool.
Avg High
50.2°F
Avg Low
31.8°F
Precipitation
2.62 in
Snow
13.1 in
April records in Keystone
| Date | Record High | Record Low | Record Precip |
|---|---|---|---|
| April 1 | 75.9°F (2012) | 1.0°F (1975) | 0.73 in (2010) |
| April 2 | 69.1°F (1991) | 5.0°F (1975) | 0.37 in (2017) |
| April 3 | 69.1°F (1992) | 1.9°F (2020) | 0.71 in (2017) |
| April 4 | 73.0°F (1992) | 1.9°F (1968) | 0.71 in (1997) |
| April 5 | 73.0°F (1991) | -2.9°F (2023) | 0.96 in (1997) |
| April 6 | 73.0°F (1969) | 6.1°F (1979) | 1.62 in (2024) |
| April 7 | 73.9°F (1988) | 3.9°F (2007) | 0.65 in (1976) |
| April 8 | 75.9°F (2005) | 5.0°F (1997) | 1.45 in (1975) |
| April 9 | 75.0°F (1977) | 6.1°F (2013) | 1.21 in (2017) |
| April 10 | 78.1°F (1996) | 8.1°F (1997) | 1.06 in (1963) |
| April 11 | 78.1°F (1985) | 7.0°F (1997) | 1.55 in (1991) |
| April 12 | 78.1°F (1976) | 8.1°F (2022) | 0.80 in (1977) |
| April 13 | 77.0°F (2024) | 7.0°F (2022) | 1.05 in (1996) |
| April 14 | 77.0°F (1963) | 9.0°F (1986) | 0.52 in (1967) |
| April 15 | 80.1°F (1985) | 12.9°F (2022) | 0.69 in (2024) |
| April 16 | 73.0°F (1988) | 10.9°F (2022) | 0.71 in (2009) |
| April 17 | 77.0°F (1987) | 16.0°F (2013) | 0.30 in (2009) |
| April 18 | 81.0°F (1987) | 12.9°F (1966) | 1.90 in (1970) |
| April 19 | 78.1°F (1987) | 10.9°F (1966) | 2.30 in (2000) |
| April 20 | 82.0°F (1962) | 8.1°F (1966) | 0.95 in (1971) |
| April 21 | 82.9°F (1989) | 15.1°F (2021) | 1.02 in (2005) |
| April 22 | 84.9°F (1989) | 15.1°F (2013) | 1.25 in (2001) |
| April 23 | 81.0°F (1989) | 12.9°F (2013) | 1.37 in (2010) |
| April 24 | 79.0°F (1974) | 23.0°F (2006) | 0.54 in (2006) |
| April 25 | 78.1°F (1962) | 21.9°F (2017) | 1.09 in (1984) |
| April 26 | 75.9°F (1987) | 16.0°F (1994) | 0.98 in (1991) |
| April 27 | 78.1°F (2001) | 15.1°F (1984) | 1.78 in (1963) |
| April 28 | 79.0°F (1987) | 16.0°F (1994) | 0.62 in (1978) |
| April 29 | 78.1°F (1992) | 17.1°F (1990) | 0.74 in (1978) |
| April 30 | 81.0°F (1992) | 14.0°F (2005) | 1.24 in (1993) |