Sumner Washington Climate Data

Monthly Average Climate Data for Sumner Washington

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January35.4 °F47.7 °F6.17 in.
February35.2 °F50.4 °F3.5 in.
March37.7 °F54.6 °F4.15 in.
April41.1 °F59.7 °F3.04 in.
May46.7 °F66.8 °F2.16 in.
June51.4 °F71.3 °F1.95 in.
July54.7 °F77.8 °F0.75 in.
August54.8 °F78.0 °F1.36 in.
September50.4 °F72.2 °F1.45 in.
October44.2 °F61.3 °F4.27 in.
November38.6 °F52.4 °F6.45 in.
December34.9 °F46.8 °F6.3 in.
Annual43.8 °F61.6 °F41.55 in.

Climate Data for Sumner Washington

Average First Frost DateNov. 1 - Nov. 10
Average Last Frost DateApr. 11 - Apr. 20
Average Days With Frost40-50 Days
Plant Hardiness Zone - 2023Zone 8b : 15°F to 20°F
Plant Hardiness Zone - 2012Zone 8b : 15°F to 20°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationCsb - Warm-Summer Mediterranean Climate