Keystone South Dakota Climate Data

Monthly Average Climate Data for Keystone South Dakota

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January14.1 °F38.0 °F0.48 in.
February14.3 °F38.7 °F0.71 in.
March21.8 °F46.7 °F1.25 in.
April29.6 °F53.3 °F2.46 in.
May39.4 °F62.5 °F4.42 in.
June48.9 °F73.4 °F3.52 in.
July55.5 °F81.4 °F3.22 in.
August53.5 °F80.5 °F2.29 in.
September44.6 °F72.3 °F1.59 in.
October32.9 °F58.0 °F1.66 in.
November22.9 °F46.8 °F0.64 in.
December15.1 °F38.7 °F0.5 in.
Annual32.7 °F57.5 °F22.74 in.

Climate Data for Keystone South Dakota

Average First Frost DateSep. 21 - Sep. 30
Average Last Frost DateMay 21 - May 31
Average Days With Frost150-180 Days
Plant Hardiness Zone - 2023Zone 5a : -20°F to -15°F
Plant Hardiness Zone - 2012Zone 5a : -20°F to -15°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation