Marlborough Connecticut Climate Data

Monthly Average Climate Data for Marlborough Connecticut

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January18.7 °F36.3 °F3.75 in.
February20.0 °F38.9 °F3.25 in.
March27.5 °F46.7 °F4.49 in.
April37.5 °F58.9 °F4.32 in.
May47.3 °F69.2 °F3.72 in.
June56.7 °F77.6 °F4.41 in.
July62.3 °F82.8 °F4.02 in.
August60.8 °F81.4 °F4.29 in.
September53.2 °F74.5 °F4.5 in.
October41.9 °F62.9 °F4.97 in.
November32.4 °F51.8 °F3.97 in.
December24.7 °F41.9 °F4.56 in.
Annual40.3 °F60.2 °F50.25 in.

Climate Data for Marlborough Connecticut

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 11 - May 20
Average Days With Frost100-125 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 ClassificationDfb - Humid Continental Mild Summer, Wet All Year