Bethlehem New Hampshire Climate Data

Monthly Average Climate Data for Bethlehem New Hampshire

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January6.5 °F26.4 °F2.42 in.
February7.7 °F29.7 °F2.23 in.
March16.8 °F38.8 °F2.58 in.
April29.0 °F51.8 °F3.2 in.
May40.5 °F65.6 °F3.83 in.
June49.6 °F73.5 °F4.28 in.
July54.2 °F77.7 °F4.44 in.
August52.3 °F76.1 °F4.21 in.
September45.2 °F69.0 °F3.49 in.
October35.2 °F55.6 °F4.27 in.
November25.2 °F42.9 °F3.03 in.
December14.2 °F31.5 °F3.43 in.
Annual31.4 °F53.2 °F41.41 in.

Climate Data for Bethlehem New Hampshire

Average First Frost DateSep.11 - Sep. 20
Average Last Frost DateJun. 11 - Jun. 20
Average Days With FrostOver 180 Days
Plant Hardiness Zone - 2023Zone 5a : -20°F to -15°F
Plant Hardiness Zone - 2012Zone 4b : -25°F to -20°F
Current Drought ConditionsNormal
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year