Norristown Pennsylvania Climate Data

Monthly Average Climate Data for Norristown Pennsylvania

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January23.7 °F40.3 °F3.46 in.
February25.2 °F43.0 °F2.88 in.
March32.2 °F51.5 °F4.19 in.
April42.3 °F63.9 °F3.76 in.
May52.2 °F73.6 °F4.06 in.
June61.7 °F82.6 °F4.37 in.
July66.8 °F87.1 °F4.55 in.
August65.2 °F85.5 °F4.74 in.
September57.8 °F79.0 °F4.45 in.
October45.9 °F66.6 °F4.04 in.
November36.0 °F55.4 °F3.25 in.
December29.0 °F45.3 °F4.38 in.
Annual44.8 °F64.5 °F48.13 in.

Climate Data for Norristown Pennsylvania

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 7a : 0°F to 5°F
Plant Hardiness Zone - 2012Zone 7a : 0°F to 5°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation