Grafton New Hampshire Climate Data

Monthly Average Climate Data for Grafton New Hampshire

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January7.3 °F27.7 °F2.92 in.
February8.1 °F30.8 °F2.34 in.
March17.5 °F39.1 °F3.07 in.
April29.5 °F52.4 °F3.2 in.
May41.5 °F65.4 °F3.47 in.
June49.7 °F73.6 °F4.05 in.
July54.3 °F78.4 °F4.04 in.
August52.4 °F76.9 °F3.57 in.
September44.8 °F69.6 °F3.48 in.
October34.4 °F56.3 °F4.84 in.
November25.6 °F44.3 °F3.2 in.
December15.4 °F33.1 °F3.47 in.
Annual31.7 °F54 °F41.65 in.

Climate Data for Grafton New Hampshire

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateJun. 1 - Jun. 10
Average Days With Frost150-180 Days
Plant Hardiness ZoneZone 4b : -25°F to -20°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year