Southbury Connecticut Climate Data

Monthly Average Climate Data for Southbury Connecticut

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January18.7 °F36.2 °F3.75 in.
February20.1 °F39.0 °F3.09 in.
March27.4 °F46.8 °F4.27 in.
April37.7 °F59.1 °F4.06 in.
May47.9 °F70.3 °F3.98 in.
June57.1 °F78.4 °F4.61 in.
July62.7 °F83.4 °F4.55 in.
August61.2 °F81.6 °F4.47 in.
September53.9 °F74.6 °F4.52 in.
October42.0 °F63.2 °F4.99 in.
November32.4 °F51.7 °F4.04 in.
December24.5 °F41.2 °F4.39 in.
Annual40.5 °F60.5 °F50.72 in.

Climate Data for Southbury Connecticut

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 1 - May 10
Average Days With Frost100-125 Days
Plant Hardiness Zone - 2023Zone 6b : -5°F to 0°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