New Castle Indiana Climate Data

Monthly Average Climate Data for New Castle Indiana

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January18.0 °F33.9 °F3.05 in.
February20.5 °F37.9 °F2.45 in.
March29.0 °F48.5 °F3.49 in.
April39.3 °F61.4 °F4.46 in.
May50.4 °F71.6 °F4.88 in.
June59.6 °F80.0 °F5.26 in.
July62.0 °F82.8 °F4.52 in.
August60.1 °F81.7 °F3.47 in.
September52.6 °F76.7 °F3.19 in.
October41.8 °F64.7 °F3.24 in.
November31.9 °F50.5 °F3.44 in.
December23.7 °F38.6 °F3.12 in.
Annual40.7 °F60.7 °F44.57 in.

Climate Data for New Castle 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 5b : -15°F to -10°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation