Hillsborough California Climate Data

Monthly Average Climate Data for Hillsborough California

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January44.1 °F58.4 °F5.24 in.
February45.1 °F60.6 °F5.45 in.
March46.1 °F62.9 °F3.59 in.
April46.9 °F64.8 °F1.97 in.
May50.0 °F67.6 °F0.91 in.
June52.1 °F71.6 °F0.19 in.
July54.2 °F74.1 °F0.11 in.
August54.7 °F74.8 °F0.09 in.
September54.3 °F76.0 °F0.08 in.
October51.7 °F72.3 °F1.06 in.
November47.3 °F64.1 °F2.42 in.
December43.6 °F58.4 °F5.35 in.
Annual49.2 °F67.1 °F26.46 in.

Climate Data for Hillsborough California

Average First Frost DateJan. 21 - Jan. 31
Average Last Frost DateFrost Rare
Average Days With FrostFrost Rare
Plant Hardiness Zone - 2023Zone 10a : 30°F to 25°F
Plant Hardiness Zone - 2012Zone 10a : 30°F to 25°F
Current Drought ConditionsNormal
Köppen Climate ClassificationCsb - Warm-Summer Mediterranean Climate
2024 plantmaps.com