Grantham New Hampshire Climate Data

Monthly Average Climate Data for Grantham New Hampshire

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-13.2 °C-2.8 °C78.23 mm
February-12.5 °C-0.9 °C68.33 mm
March-7.6 °C3.8 °C82.8 mm
April-0.5 °C11.3 °C89.41 mm
May5.9 °C18.4 °C92.96 mm
June11 °C23 °C113.03 mm
July13.6 °C25.6 °C111.76 mm
August12.6 °C24.8 °C101.35 mm
September8.6 °C20.7 °C97.54 mm
October2.5 °C13.5 °C132.84 mm
November-2.8 °C6.6 °C90.42 mm
December-8.7 °C0.3 °C98.55 mm
Annual0.7 °C12 °C1157.22 mm

Climate Data for Grantham New Hampshire

Average First Frost DateSep. 21 - Sep. 30
Average Last Frost DateJun. 11 - Jun. 20
Average Days With Frost150-180 Days
Plant Hardiness Zone - 2023Zone 5a : -28.9°C to -26.1°C
Plant Hardiness Zone - 2012Zone 5a : -28.9°C to -26.1°C
Current Drought ConditionsNormal
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year
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