Alton New Hampshire Climate Data

Monthly Average Climate Data for Alton New Hampshire

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January-10.6 °C-1.1 °C89.15 mm
February-10 °C0.7 °C75.95 mm
March-5.3 °C5.4 °C89.92 mm
April0.8 °C13 °C92.71 mm
May7.1 °C19.8 °C86.87 mm
June12.5 °C24.7 °C111.76 mm
July15.6 °C27.6 °C111.51 mm
August14.8 °C26.6 °C89.41 mm
September10.6 °C22.2 °C101.85 mm
October4.3 °C14.8 °C127 mm
November-1.1 °C8 °C96.77 mm
December-6.3 °C2.2 °C112.27 mm
Annual2.7 °C13.7 °C1185.17 mm

Climate Data for Alton New Hampshire

Average First Frost DateOct. 1 - Oct. 10
Average Last Frost DateJun. 1 - Jun. 10
Average Days With Frost150-180 Days
Plant Hardiness Zone - 2023Zone 5b : -26.1°C to -23.3°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