Iselin New Jersey Climate Data

Monthly Average Climate Data for Iselin New Jersey

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-4.6 °C4.5 °C90.42 mm
February-3.7 °C6 °C71.88 mm
March0.1 °C10.5 °C106.68 mm
April5.7 °C17.3 °C98.81 mm
May11 °C22.7 °C100.58 mm
June16.2 °C27.7 °C116.08 mm
July19.2 °C30.4 °C126.75 mm
August18.4 °C29.4 °C113.54 mm
September14.4 °C25.7 °C108.46 mm
October7.9 °C19 °C107.95 mm
November2.5 °C12.9 °C85.6 mm
December-1.6 °C7.3 °C105.92 mm
Annual7.1 °C17.8 °C1232.67 mm

Climate Data for Iselin New Jersey

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateMay 1 - May 10
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 7a : -17.8°C to -15°C
Plant Hardiness Zone - 2012Zone 6b : -20.6°C to -17.8°C
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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