Old Lyme Connecticut Climate Data

Monthly Average Climate Data for Old Lyme Connecticut

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-5.8 °C3.8 °C94.74 mm
February-5 °C4.8 °C84.84 mm
March-1.3 °C8.3 °C118.36 mm
April3.7 °C14.3 °C117.35 mm
May8.8 °C19.4 °C95.5 mm
June14.2 °C24.2 °C108.2 mm
July17.6 °C27.4 °C87.12 mm
August17 °C26.6 °C104.65 mm
September13.3 °C23.7 °C110.24 mm
October7.8 °C17.8 °C119.38 mm
November2.6 °C12.1 °C102.11 mm
December-2.1 °C6.9 °C117.6 mm
Annual5.9 °C15.8 °C1260.09 mm

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 : -17.8°C to -15°C
Plant Hardiness Zone - 2012Zone 6b : -20.6°C to -17.8°C
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year
2024 plantmaps.com