Hillsborough California Climate Data

Monthly Average Climate Data for Hillsborough California

Switch Data to Fahrenheit
MonthAvg. LowAvg. HighAvg. Precip
January6.7 °C14.7 °C133.1 mm
February7.3 °C15.9 °C138.43 mm
March7.8 °C17.2 °C91.19 mm
April8.3 °C18.2 °C50.04 mm
May10 °C19.8 °C23.11 mm
June11.2 °C22 °C4.83 mm
July12.3 °C23.4 °C2.79 mm
August12.6 °C23.8 °C2.29 mm
September12.4 °C24.4 °C2.03 mm
October10.9 °C22.4 °C26.92 mm
November8.5 °C17.8 °C61.47 mm
December6.4 °C14.7 °C135.89 mm
Annual9.5 °C19.5 °C672.09 mm

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 : -1.1°C to 1.7°C
Plant Hardiness Zone - 2012Zone 10a : -1.1°C to 1.7°C
Current Drought ConditionsAbnormally Dry
Köppen Climate ClassificationCsb - Warm-Summer Mediterranean Climate
2024 plantmaps.com