Mendham New Jersey Climate Data

Monthly Average Climate Data for Mendham New Jersey

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-6.3 °C2.8 °C96.52 mm
February-5.8 °C4.2 °C75.69 mm
March-1.8 °C8.8 °C110.49 mm
April4.2 °C15.8 °C103.63 mm
May9.7 °C21.3 °C105.92 mm
June15.1 °C26 °C130.81 mm
July17.6 °C28.8 °C120.4 mm
August16.7 °C27.8 °C119.13 mm
September12.7 °C23.9 °C117.86 mm
October6.2 °C17.4 °C114.05 mm
November1 °C11.2 °C92.71 mm
December-3 °C5.6 °C115.82 mm
Annual5.5 °C16.1 °C1303.03 mm

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 : -20.6°C to -17.8°C
Plant Hardiness Zone - 2012Zone 6a : -23.3°C to -20.6°C
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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