Mount Vernon Washington Climate Data

Monthly Average Climate Data for Mount Vernon Washington

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January35.0 °F46.3 °F4.31 in.
February34.9 °F48.5 °F3.06 in.
March37.5 °F52.5 °F3.22 in.
April40.9 °F57.4 °F2.93 in.
May45.8 °F63.7 °F2.58 in.
June50.0 °F67.9 °F1.94 in.
July52.7 °F73.4 °F0.96 in.
August52.6 °F74.3 °F1.13 in.
September49.0 °F68.8 °F1.93 in.
October43.2 °F59.2 °F3.43 in.
November38.3 °F50.9 °F4.9 in.
December34.6 °F45.3 °F3.99 in.
Annual42.9 °F59 °F34.38 in.

Climate Data for Mount Vernon Washington

Average First Frost DateNov. 1 - Nov. 10
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost40-50 Days
Plant Hardiness Zone - 2023Zone 8b : 15°F to 20°F
Plant Hardiness Zone - 2012Zone 8a : 10°F to 15°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationCsb - Warm-Summer Mediterranean Climate