Jefferson Oregon Climate Data

Monthly Average Climate Data for Jefferson Oregon

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January35.2 °F47.5 °F6.08 in.
February35.3 °F51.4 °F4.75 in.
March37.5 °F56.2 °F5.03 in.
April40.5 °F61.3 °F3.74 in.
May45.6 °F68.0 °F2.61 in.
June49.6 °F73.4 °F1.65 in.
July53.3 °F82.1 °F0.37 in.
August52.9 °F82.6 °F0.45 in.
September49.1 °F76.9 °F1.59 in.
October43.1 °F64.6 °F3.76 in.
November38.5 °F53.1 °F6.29 in.
December34.8 °F46.6 °F7.33 in.
Annual43 °F63.6 °F43.65 in.

Climate Data for Jefferson 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