Grass Valley California Climate Data

Monthly Average Climate Data for Grass Valley California

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January36.1 °F54.1 °F9.28 in.
February36.6 °F55.8 °F9.34 in.
March38.6 °F59.7 °F8.74 in.
April41.4 °F63.9 °F4.57 in.
May47.9 °F72.3 °F2.88 in.
June54.4 °F81.7 °F0.73 in.
July60.7 °F89.6 °F0.01 in.
August60.4 °F89.4 °F0.11 in.
September55.4 °F84.4 °F0.52 in.
October47.9 °F73.8 °F2.5 in.
November40.3 °F60.5 °F5.6 in.
December35.6 °F52.6 °F10.17 in.
Annual46.3 °F69.8 °F54.45 in.

Climate Data for Grass Valley California

Average First Frost DateNov. 1 - Nov. 10
Average Last Frost DateApr. 21 - Apr. 30
Average Days With Frost50-75 Days
Plant Hardiness Zone - 2023Zone 9a : 20°F to 25°F
Plant Hardiness Zone - 2012Zone 9a : 20°F to 25°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationCsa - Hot-Summer Mediterranean Climate
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