Monmouth Oregon Climate Data

Monthly Average Climate Data for Monmouth Oregon

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January35.3 °F47.2 °F6.5 in.
February35.5 °F51.1 °F4.82 in.
March37.6 °F55.8 °F4.61 in.
April40.4 °F60.7 °F3.5 in.
May45.3 °F67.8 °F2.36 in.
June49.4 °F73.3 °F1.43 in.
July52.9 °F82.2 °F0.24 in.
August52.7 °F82.9 °F0.37 in.
September49.2 °F77.1 °F1.37 in.
October43.4 °F64.5 °F3.54 in.
November38.6 °F52.9 °F6.25 in.
December34.8 °F46.3 °F7.78 in.
Annual42.9 °F63.5 °F42.77 in.

Climate Data for Monmouth Oregon

Average First Frost DateOct. 21 - Oct. 31
Average Last Frost DateMay 1 - May 10
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