Tri-City Oregon Climate Data

Monthly Average Climate Data for Tri-City Oregon

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January34.4 °F49.4 °F5.34 in.
February34.9 °F54.0 °F3.78 in.
March36.6 °F58.7 °F3.71 in.
April39.5 °F64.5 °F3.09 in.
May44.5 °F72.6 °F2.2 in.
June48.9 °F79.3 °F0.99 in.
July53.4 °F88.2 °F0.27 in.
August52.4 °F88.6 °F0.32 in.
September47.4 °F82.6 °F0.8 in.
October41.5 °F69.4 °F2.26 in.
November38.1 °F55.1 °F4.91 in.
December34.3 °F47.6 °F6.93 in.
Annual42.2 °F67.5 °F34.6 in.

Climate Data for Tri-City Oregon

Average First Frost DateNov. 1 - Nov. 10
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost50-75 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