Napoleon Michigan Climate Data

Monthly Average Climate Data for Napoleon Michigan

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January15.8 °F31.0 °F2.35 in.
February16.7 °F34.1 °F1.98 in.
March24.9 °F44.3 °F2.33 in.
April36.0 °F57.7 °F3.29 in.
May47.4 °F69.5 °F3.92 in.
June56.8 °F78.8 °F3.69 in.
July60.2 °F82.6 °F3.43 in.
August58.6 °F80.7 °F3.53 in.
September51.0 °F74.5 °F3.13 in.
October40.0 °F61.4 °F3.0 in.
November30.3 °F47.6 °F2.73 in.
December22.2 °F36.0 °F2.24 in.
Annual38.3 °F58.2 °F35.62 in.

Climate Data for Napoleon Michigan

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 11 - May 20
Average Days With Frost125-150 Days
Plant Hardiness Zone - 2023Zone 6a : -10°F to -5°F
Plant Hardiness Zone - 2012Zone 5b : -15°F to -10°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year
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