Grafton New Hampshire Climate Data

Monthly Average Climate Data for Grafton New Hampshire

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-13.7 °C-2.4 °C74.17 mm
February-13.3 °C-0.7 °C59.44 mm
March-8.1 °C3.9 °C77.98 mm
April-1.4 °C11.3 °C81.28 mm
May5.3 °C18.6 °C88.14 mm
June9.8 °C23.1 °C102.87 mm
July12.4 °C25.8 °C102.62 mm
August11.3 °C24.9 °C90.68 mm
September7.1 °C20.9 °C88.39 mm
October1.3 °C13.5 °C122.94 mm
November-3.6 °C6.8 °C81.28 mm
December-9.2 °C0.6 °C88.14 mm
Annual-0.2 °C12.2 °C1057.93 mm

Climate Data for Grafton New Hampshire

Average First Frost DateSep. 21 - Sep. 30
Average Last Frost DateJun. 1 - Jun. 10
Average Days With Frost150-180 Days
Plant Hardiness Zone - 2023Zone 5a : -28.9°C to -26.1°C
Plant Hardiness Zone - 2012Zone 4b : -31.7°C to -28.9°C
Current Drought ConditionsNormal
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year
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