Richland Washington Climate Data

Monthly Average Climate Data for Richland Washington

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January28.4 °F41.4 °F1.11 in.
February29.2 °F47.9 °F0.79 in.
March34.4 °F57.8 °F0.63 in.
April39.9 °F66.0 °F0.64 in.
May47.4 °F75.2 °F0.74 in.
June53.8 °F81.9 °F0.62 in.
July59.4 °F91.2 °F0.17 in.
August58.7 °F90.2 °F0.25 in.
September50.6 °F80.5 °F0.22 in.
October40.9 °F65.7 °F0.64 in.
November33.3 °F50.7 °F0.93 in.
December28.2 °F40.8 °F1.17 in.
Annual42 °F65.8 °F7.91 in.

Climate Data for Richland Washington

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost75-100 Days
Plant Hardiness Zone - 2023Zone 7b : 5°F to 10°F
Plant Hardiness Zone - 2012Zone 7b : 5°F to 10°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationBWk - Cold Desert Climate