Stonington Connecticut Climate Data

Monthly Average Climate Data for Stonington Connecticut

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January24.1 °F38.6 °F3.83 in.
February25.2 °F39.8 °F3.28 in.
March30.9 °F45.9 °F4.83 in.
April39.9 °F55.6 °F4.43 in.
May49.1 °F64.5 °F3.51 in.
June58.6 °F73.5 °F3.74 in.
July65.2 °F79.4 °F3.06 in.
August64.6 °F78.4 °F3.77 in.
September58.6 °F73.1 °F3.8 in.
October48.4 °F62.9 °F4.57 in.
November38.9 °F53.5 °F3.88 in.
December30.6 °F44.3 °F4.63 in.
Annual44.5 °F59.1 °F47.33 in.

Climate Data for Stonington Connecticut

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 7a : 0°F to 5°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year