Decatur Indiana Climate Data

Monthly Average Climate Data for Decatur Indiana

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January17.9 °F32.8 °F2.54 in.
February19.8 °F36.4 °F2.14 in.
March28.2 °F47.3 °F2.72 in.
April38.8 °F60.7 °F3.93 in.
May50.1 °F72.0 °F4.64 in.
June60.1 °F80.9 °F4.36 in.
July63.2 °F84.5 °F4.32 in.
August61.0 °F82.6 °F3.88 in.
September53.4 °F76.9 °F3.01 in.
October42.5 °F64.4 °F2.89 in.
November32.4 °F49.8 °F3.01 in.
December23.7 °F37.8 °F2.44 in.
Annual40.9 °F60.5 °F39.88 in.

Climate Data for Decatur Indiana

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 11 - May 20
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 6a : -10°F to -5°F
Plant Hardiness Zone - 2012Zone 6a : -10°F to -5°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation