Iselin New Jersey Climate Data

Monthly Average Climate Data for Iselin New Jersey

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January23.8 °F40.1 °F3.56 in.
February25.3 °F42.8 °F2.83 in.
March32.1 °F50.9 °F4.2 in.
April42.2 °F63.1 °F3.89 in.
May51.8 °F72.9 °F3.96 in.
June61.1 °F81.9 °F4.57 in.
July66.6 °F86.8 °F4.99 in.
August65.1 °F84.9 °F4.47 in.
September58.0 °F78.2 °F4.27 in.
October46.2 °F66.2 °F4.25 in.
November36.5 °F55.3 °F3.37 in.
December29.2 °F45.2 °F4.17 in.
Annual44.8 °F64 °F48.53 in.

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 : 0°F to 5°F
Plant Hardiness Zone - 2012Zone 6b : -5°F to 0°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation