Dennis Massachusetts Climate Data

Monthly Average Climate Data for Dennis Massachusetts

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-4.1 °C3.6 °C109.98 mm
February-3.6 °C4 °C93.22 mm
March-0.8 °C6.8 °C118.62 mm
April3.9 °C11.6 °C111.76 mm
May9.1 °C16.9 °C86.61 mm
June14.2 °C21.9 °C87.63 mm
July18.2 °C25.8 °C72.14 mm
August17.8 °C25.3 °C84.58 mm
September14.3 °C22.2 °C106.17 mm
October8.7 °C16.5 °C117.86 mm
November3.6 °C11.3 °C103.12 mm
December-0.7 °C6.7 °C131.57 mm
Annual6.7 °C14.4 °C1223.26 mm

Climate Data for Dennis Massachusetts

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateMay 1 - May 10
Average Days With Frost75-100 Days
Plant Hardiness Zone - 2023Zone 7b : -15°C to -12.2°C
Plant Hardiness Zone - 2012Zone 7a : -17.8°C to -15°C
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year
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