Sullivan Indiana Climate Data

Monthly Average Climate Data for Sullivan Indiana

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-5.8 °C3.2 °C82.55 mm
February-4.2 °C5.9 °C62.48 mm
March0.8 °C12.1 °C88.14 mm
April6.6 °C18.9 °C127.76 mm
May12.4 °C24.3 °C122.68 mm
June17.2 °C28.8 °C118.36 mm
July18.8 °C30.4 °C109.22 mm
August17.6 °C29.9 °C77.98 mm
September13.4 °C26.9 °C90.17 mm
October7 °C20.3 °C91.19 mm
November1.3 °C12.3 °C92.96 mm
December-3.2 °C5.8 °C80.77 mm
Annual6.8 °C18.2 °C1144.26 mm

Climate Data for Sullivan Indiana

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 1 - May 10
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 6b : -20.6°C to -17.8°C
Plant Hardiness Zone - 2012Zone 6a : -23.3°C to -20.6°C
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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