Thornton California Climate Data

Monthly Average Climate Data for Thornton California

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January38.7 °F55.8 °F3.75 in.
February40.8 °F61.0 °F3.32 in.
March43.9 °F66.0 °F2.7 in.
April46.5 °F71.4 °F1.41 in.
May51.4 °F78.7 °F0.73 in.
June55.6 °F85.3 °F0.25 in.
July57.9 °F89.4 °F0.0 in.
August57.7 °F89.2 °F0.02 in.
September55.3 °F86.7 °F0.08 in.
October49.2 °F78.0 °F0.8 in.
November41.8 °F65.0 °F1.72 in.
December37.9 °F56.1 °F3.42 in.
Annual48.1 °F73.6 °F18.2 in.

Climate Data for Thornton California

Average First Frost DateDec. 1 - Dec. 10
Average Last Frost DateFeb. 11 - Feb. 20
Average Days With Frost10-20 Days
Plant Hardiness Zone - 2023Zone 9b : 25°F to 20°F
Plant Hardiness Zone - 2012Zone 9b : 25°F to 20°F
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationCsb - Warm-Summer Mediterranean Climate
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