Old Lyme Connecticut Climate Data

Monthly Average Climate Data for Old Lyme Connecticut

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January21.6 °F38.9 °F3.73 in.
February23.0 °F40.6 °F3.34 in.
March29.7 °F46.9 °F4.66 in.
April38.7 °F57.7 °F4.62 in.
May47.8 °F66.9 °F3.76 in.
June57.6 °F75.6 °F4.26 in.
July63.7 °F81.3 °F3.43 in.
August62.6 °F79.9 °F4.12 in.
September56.0 °F74.7 °F4.34 in.
October46.0 °F64.1 °F4.7 in.
November36.6 °F53.7 °F4.02 in.
December28.2 °F44.5 °F4.63 in.
Annual42.6 °F60.4 °F49.61 in.

Climate Data for Old Lyme 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 7a : 0°F to 5°F
Plant Hardiness Zone - 2012Zone 6b : -5°F to 0°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year
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