Fort Benton Montana Climate Data

Monthly Average Climate Data for Fort Benton Montana

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January10.1 °F35.0 °F0.51 in.
February12.5 °F39.0 °F0.44 in.
March20.7 °F47.9 °F0.52 in.
April31.4 °F59.1 °F1.49 in.
May40.6 °F67.5 °F2.13 in.
June48.8 °F76.0 °F2.58 in.
July54.0 °F86.1 °F1.25 in.
August51.7 °F85.6 °F1.19 in.
September42.6 °F75.0 °F1.18 in.
October30.8 °F60.4 °F0.92 in.
November20.9 °F46.5 °F0.59 in.
December12.7 °F36.6 °F0.48 in.
Annual31.4 °F59.6 °F13.28 in.

Climate Data for Fort Benton Montana

Average First Frost DateSep. 21 - Sep. 30
Average Last Frost DateJun. 1 - Jun. 10
Average Days With Frost150-180 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 ClassificationBSk - Cold Semi-Arid Climate