Castlewood South Dakota Climate Data

Monthly Average Climate Data for Castlewood South Dakota

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January2.9 °F21.7 °F0.58 in.
February6.7 °F26.5 °F0.65 in.
March19.0 °F38.6 °F1.1 in.
April31.2 °F53.7 °F2.35 in.
May44.4 °F66.7 °F3.17 in.
June55.4 °F76.8 °F4.25 in.
July59.8 °F82.0 °F3.59 in.
August57.0 °F80.0 °F2.99 in.
September48.2 °F72.2 °F2.92 in.
October34.3 °F57.4 °F2.17 in.
November21.3 °F40.9 °F0.82 in.
December9.5 °F27.0 °F0.71 in.
Annual32.5 °F53.6 °F25.3 in.

Climate Data for Castlewood South Dakota

Average First Frost DateOct. 1 - Oct. 10
Average Last Frost DateMay 21 - May 31
Average Days With Frost150-180 Days
Plant Hardiness Zone - 2023Zone 4a : -30°F to -25°F
Plant Hardiness Zone - 2012Zone 4a : -30°F to -25°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year