Northumberland New Hampshire Climate Data

Monthly Average Climate Data for Northumberland New Hampshire

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January4.1 °F25.7 °F2.57 in.
February5.1 °F29.0 °F2.33 in.
March15.4 °F37.9 °F2.61 in.
April28.7 °F51.3 °F3.31 in.
May40.0 °F65.2 °F3.98 in.
June49.0 °F73.3 °F4.54 in.
July53.7 °F77.8 °F4.43 in.
August52.1 °F76.4 °F4.24 in.
September44.3 °F69.1 °F3.55 in.
October34.0 °F55.6 °F4.42 in.
November24.4 °F42.5 °F3.09 in.
December12.8 °F31.1 °F3.39 in.
Annual30.3 °F52.9 °F42.46 in.

Climate Data for Northumberland New Hampshire

Average First Frost DateSep.11 - Sep. 20
Average Last Frost DateJun. 1 - Jun. 10
Average Days With FrostOver 180 Days
Plant Hardiness Zone - 2023Zone 4a : -30°F to -25°F
Plant Hardiness Zone - 2012Zone 4a : -30°F to -25°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfc - Subarctic With Cool Summers And Year Around Rainfall