Greenwich Connecticut Climate Data

Monthly Average Climate Data for Greenwich Connecticut

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January24.3 °F38.8 °F3.96 in.
February25.0 °F40.9 °F2.91 in.
March31.7 °F47.6 °F4.16 in.
April41.5 °F59.2 °F4.05 in.
May51.0 °F69.2 °F3.8 in.
June60.8 °F78.1 °F4.58 in.
July66.7 °F83.9 °F3.96 in.
August65.8 °F81.8 °F4.61 in.
September58.6 °F75.8 °F4.78 in.
October48.4 °F64.4 °F4.48 in.
November38.8 °F53.8 °F3.91 in.
December31.0 °F44.1 °F4.43 in.
Annual45.3 °F61.5 °F49.63 in.

Climate Data for Greenwich Connecticut

Average First Frost DateNov. 1 - Nov. 10
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost75-100 Days
Plant Hardiness Zone - 2023Zone 7b : 5°F to 10°F
Plant Hardiness Zone - 2012Zone 7a : 0°F to 5°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation