Thomaston Connecticut Climate Data

Monthly Average Climate Data for Thomaston Connecticut

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January17.2 °F36.0 °F3.53 in.
February18.4 °F39.1 °F3.16 in.
March25.9 °F47.0 °F4.37 in.
April35.9 °F59.8 °F3.96 in.
May46.3 °F70.8 °F4.13 in.
June55.7 °F79.3 °F4.59 in.
July61.1 °F84.3 °F4.8 in.
August59.5 °F82.3 °F4.76 in.
September52.1 °F75.2 °F4.63 in.
October40.6 °F63.0 °F5.54 in.
November31.0 °F51.5 °F4.04 in.
December23.4 °F40.9 °F4.61 in.
Annual38.9 °F60.8 °F52.12 in.

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 : -5°F to 0°F
Plant Hardiness Zone - 2012Zone 6a : -10°F to -5°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfa - Humid Continental Hot Summers With Year Around Precipitation