Alton New Hampshire Climate Data

Monthly Average Climate Data for Alton New Hampshire

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January13.0 °F30.1 °F3.51 in.
February14.0 °F33.3 °F2.99 in.
March22.4 °F41.7 °F3.54 in.
April33.4 °F55.4 °F3.65 in.
May44.8 °F67.7 °F3.42 in.
June54.5 °F76.5 °F4.4 in.
July60.1 °F81.6 °F4.39 in.
August58.6 °F79.8 °F3.52 in.
September51.1 °F71.9 °F4.01 in.
October39.8 °F58.6 °F5.0 in.
November30.0 °F46.4 °F3.81 in.
December20.6 °F35.9 °F4.42 in.
Annual36.9 °F56.6 °F46.66 in.

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 : -15°F to -10°F
Plant Hardiness Zone - 2012Zone 5a : -20°F to -15°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year