Castleton Vermont Climate Data

Monthly Average Climate Data for Castleton Vermont

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January11.0 °F29.5 °F2.75 in.
February11.8 °F32.3 °F2.13 in.
March21.7 °F41.3 °F2.82 in.
April33.2 °F56.4 °F3.25 in.
May44.8 °F68.5 °F3.65 in.
June54.2 °F77.3 °F4.37 in.
July59.0 °F81.7 °F4.45 in.
August57.5 °F80.1 °F4.14 in.
September49.4 °F72.8 °F3.55 in.
October38.5 °F59.0 °F4.06 in.
November29.3 °F46.3 °F3.04 in.
December19.0 °F35.1 °F3.19 in.
Annual35.8 °F56.7 °F41.4 in.

Climate Data for Castleton Vermont

Average First Frost DateOct. 1 - Oct. 10
Average Last Frost DateMay 21 - May 31
Average Days With Frost150-180 Days
Plant Hardiness Zone - 2023Zone 5a : -20°F to -15°F
Plant Hardiness Zone - 2012Zone 5a : -20°F to -15°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationDfb - Humid Continental Mild Summer, Wet All Year