Seymour Connecticut Climate Data

Monthly Average Climate Data for Seymour Connecticut

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-7 °C2.6 °C100.58 mm
February-6.3 °C3.9 °C86.61 mm
March-2.2 °C8.2 °C118.11 mm
April3.4 °C14.6 °C111 mm
May9 °C20.9 °C104.9 mm
June14.2 °C25.4 °C112.78 mm
July17.3 °C28.5 °C105.16 mm
August16.4 °C27.5 °C104.65 mm
September12.5 °C23.8 °C118.11 mm
October5.9 °C17.3 °C128.52 mm
November0.6 °C11.1 °C104.65 mm
December-3.8 °C5.3 °C112.27 mm
Annual5 °C15.8 °C1307.34 mm

Climate Data for Seymour 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 6b : -20.6°C to -17.8°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