Rialto California Climate Data

Monthly Average Climate Data for Rialto California

Switch Data to Celsius/Metric Units
MonthAvg. LowAvg. HighAvg. Precip
January43.6 °F66.7 °F3.25 in.
February44.1 °F67.0 °F3.75 in.
March46.7 °F70.4 °F2.54 in.
April49.3 °F74.9 °F0.84 in.
May53.7 °F79.8 °F0.34 in.
June57.9 °F87.1 °F0.07 in.
July63.1 °F94.2 °F0.08 in.
August64.0 °F95.4 °F0.09 in.
September61.6 °F91.9 °F0.13 in.
October55.1 °F82.4 °F0.69 in.
November47.9 °F73.7 °F0.93 in.
December42.7 °F65.9 °F2.24 in.
Annual52.5 °F79.1 °F14.95 in.

Climate Data for Rialto California

Average First Frost DateDec. 11 - Dec. 20
Average Last Frost DateFeb. 21 - Feb. 29
Average Days With Frost10-20 Days
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 ClassificationCsa - Hot-Summer Mediterranean Climate
2024 plantmaps.com