Mendham New Jersey Climate Data

Monthly Average Climate Data for Mendham New Jersey

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January20.6 °F37.0 °F3.8 in.
February21.5 °F39.5 °F2.98 in.
March28.7 °F47.9 °F4.35 in.
April39.6 °F60.5 °F4.08 in.
May49.4 °F70.3 °F4.17 in.
June59.1 °F78.8 °F5.15 in.
July63.6 °F83.9 °F4.74 in.
August62.1 °F82.0 °F4.69 in.
September54.9 °F75.1 °F4.64 in.
October43.2 °F63.4 °F4.49 in.
November33.8 °F52.1 °F3.65 in.
December26.6 °F42.0 °F4.56 in.
Annual41.9 °F61 °F51.3 in.

Climate Data for Mendham New Jersey

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 11 - May 20
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 6b : -5°F to 0°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