Castine Maine Climate Data

Monthly Average Climate Data for Castine Maine

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January14.1 °F30.3 °F3.95 in.
February15.6 °F32.4 °F3.32 in.
March22.9 °F39.8 °F4.04 in.
April33.2 °F51.5 °F4.39 in.
May43.1 °F62.7 °F3.81 in.
June52.3 °F71.8 °F4.23 in.
July58.4 °F77.6 °F3.2 in.
August57.5 °F77.0 °F3.23 in.
September50.4 °F69.7 °F3.93 in.
October40.3 °F57.7 °F5.36 in.
November31.3 °F46.4 °F4.72 in.
December21.5 °F36.3 °F4.7 in.
Annual36.7 °F54.4 °F48.88 in.

Climate Data for Castine Maine

Average First Frost DateOct. 11 - Oct. 20
Average Last Frost DateMay 11 - May 20
Average Days With Frost150-180 Days
Plant Hardiness Zone - 2023Zone 5b : -15°F to -10°F
Plant Hardiness Zone - 2012Zone 5b : -15°F to -10°F
Current Drought ConditionsModerate Drought
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year
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