Duluth Minnesota Climate Data

Monthly Average Climate Data for Duluth Minnesota

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January4.5 °F21.2 °F1.08 in.
February7.3 °F25.7 °F1.01 in.
March18.4 °F35.7 °F1.28 in.
April30.5 °F46.4 °F2.53 in.
May39.9 °F58.6 °F3.05 in.
June49.2 °F67.8 °F4.16 in.
July57.3 °F75.6 °F3.82 in.
August57.3 °F74.8 °F3.49 in.
September49.1 °F66.5 °F3.27 in.
October37.9 °F53.0 °F3.04 in.
November25.2 °F38.9 °F1.91 in.
December12.3 °F26.3 °F1.36 in.
Annual32.4 °F49.2 °F30 in.

Climate Data for Duluth Minnesota

Average First Frost DateOct. 1 - Oct. 10
Average Last Frost DateMay 21 - May 31
Average Days With Frost150-180 Days
Plant Hardiness Zone - 2023Zone 4b : -25°F to -20°F
Plant Hardiness Zone - 2012Zone 4b : -25°F to -20°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year
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