Thomaston Connecticut Climate Data

Monthly Average Climate Data for Thomaston Connecticut

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-8.2 °C2.2 °C89.66 mm
February-7.6 °C3.9 °C80.26 mm
March-3.4 °C8.3 °C111 mm
April2.2 °C15.4 °C100.58 mm
May7.9 °C21.6 °C104.9 mm
June13.2 °C26.3 °C116.59 mm
July16.2 °C29.1 °C121.92 mm
August15.3 °C27.9 °C120.9 mm
September11.2 °C24 °C117.6 mm
October4.8 °C17.2 °C140.72 mm
November-0.6 °C10.8 °C102.62 mm
December-4.8 °C4.9 °C117.09 mm
Annual3.9 °C16 °C1323.84 mm

Climate Data for Thomaston Connecticut

Average First Frost DateOct. 1 - Oct. 10
Average Last Frost DateMay 11 - May 20
Average Days With Frost125-150 Days
Plant Hardiness Zone - 2023Zone 6b : -20.6°C to -17.8°C
Plant Hardiness Zone - 2012Zone 6a : -23.3°C to -20.6°C
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation
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