Iroquois South Dakota Climate Data

Monthly Average Climate Data for Iroquois South Dakota

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January5.9 °F25.1 °F0.55 in.
February10.0 °F30.5 °F0.68 in.
March21.3 °F42.6 °F1.07 in.
April33.2 °F57.3 °F2.45 in.
May45.9 °F69.3 °F3.1 in.
June56.9 °F79.3 °F3.81 in.
July61.3 °F84.8 °F3.25 in.
August59.0 °F82.8 °F2.93 in.
September50.0 °F75.1 °F2.48 in.
October35.9 °F60.3 °F2.0 in.
November22.4 °F43.6 °F0.83 in.
December11.2 °F29.9 °F0.7 in.
Annual34.4 °F56.7 °F23.85 in.

Climate Data for Iroquois 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 4b : -25°F to -20°F
Plant Hardiness Zone - 2012Zone 4b : -25°F to -20°F
Current Drought ConditionsModerate Drought
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation