Merrillville Indiana Climate Data

Monthly Average Climate Data for Merrillville Indiana

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January17.3 °F32.3 °F2.33 in.
February19.9 °F36.2 °F2.04 in.
March28.6 °F47.0 °F2.37 in.
April38.6 °F60.1 °F3.66 in.
May49.5 °F70.8 °F4.29 in.
June59.4 °F80.4 °F4.69 in.
July63.9 °F83.8 °F4.31 in.
August62.2 °F82.3 °F4.49 in.
September54.5 °F76.7 °F3.48 in.
October43.0 °F64.4 °F3.74 in.
November32.6 °F49.5 °F2.84 in.
December23.0 °F37.4 °F2.24 in.
Annual41 °F60.1 °F40.48 in.

Climate Data for Merrillville Indiana

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateMay 1 - May 10
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 ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation