Grafton North Dakota Climate Data

Monthly Average Climate Data for Grafton North Dakota

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January-2.7 °F14.1 °F0.51 in.
February0.6 °F19.1 °F0.48 in.
March14.5 °F31.9 °F0.85 in.
April30.0 °F50.7 °F1.1 in.
May42.5 °F65.7 °F3.18 in.
June54.2 °F75.5 °F3.86 in.
July57.7 °F79.9 °F3.23 in.
August54.6 °F79.4 °F2.72 in.
September45.7 °F70.0 °F2.08 in.
October33.7 °F53.6 °F1.66 in.
November18.9 °F35.0 °F0.87 in.
December5.3 °F20.5 °F0.73 in.
Annual29.6 °F49.6 °F21.27 in.

Climate Data for Grafton North Dakota

Average First Frost DateSep. 21 - Sep. 30
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 ClassificationDfb - Humid Continental Mild Summer, Wet All Year