Grand Isle Maine Climate Data

Monthly Average Climate Data for Grand Isle Maine

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January-1.7 °F19.5 °F3.29 in.
February-0.2 °F22.9 °F2.66 in.
March11.6 °F33.1 °F2.84 in.
April27.4 °F46.8 °F2.95 in.
May39.3 °F61.9 °F3.46 in.
June48.6 °F71.0 °F4.15 in.
July54.3 °F76.3 °F4.27 in.
August52.6 °F75.2 °F3.57 in.
September44.6 °F66.7 °F3.83 in.
October34.1 °F52.6 °F4.36 in.
November24.5 °F39.0 °F3.65 in.
December9.2 °F26.5 °F3.64 in.
Annual28.7 °F49.3 °F42.67 in.

Climate Data for Grand Isle Maine

Average First Frost DateSep. 21 - Sep. 30
Average Last Frost DateJun. 11 - Jun. 20
Average Days With FrostOver 180 Days
Plant Hardiness Zone - 2023Zone 4a : -30°F to -25°F
Plant Hardiness Zone - 2012Zone 3b : -35°F to -30°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year