Jefferson South Dakota Climate Data

Monthly Average Climate Data for Jefferson South Dakota

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January9.6 °F29.0 °F0.59 in.
February13.8 °F34.3 °F0.73 in.
March25.0 °F47.1 °F1.52 in.
April36.2 °F60.9 °F3.1 in.
May48.6 °F71.9 °F3.99 in.
June59.7 °F82.2 °F4.51 in.
July63.3 °F85.5 °F3.2 in.
August60.7 °F83.4 °F3.39 in.
September51.2 °F77.0 °F2.97 in.
October38.2 °F63.7 °F2.44 in.
November25.2 °F47.1 °F1.24 in.
December14.7 °F33.4 °F0.9 in.
Annual37.2 °F59.6 °F28.58 in.

Climate Data for Jefferson South Dakota

Average First Frost DateOct. 1 - Oct. 10
Average Last Frost DateMay 11 - May 20
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 ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation