ONTARIO, CALIFORNIA

Under the Köppen Climate Classification climate classification, "dry-summer subtropical" climates are often referred to as "Mediterranean". This climate zone has an an average temperature above 10°C (50°F) in their warmest months, and an average in the coldest between 18 to -3°C (64 to 27°F). Summers tend to be dry with less than one-third that of the wettest winter month, and with less than 30mm (1.18 in) of precipitation in a summer month. SMany of the regions with Mediterranean climates have relatively mild winters and very warm summers.

The Köppen Climate Classification subtype for this climate is "Csb". (Mediterran Climate).

The average temperature for the year in Ontario is 66.0°F (18.9°C). The warmest month, on average, is July with an average temperature of 78.0°F (25.6°C). The coolest month on average is January, with an average temperature of 55.0°F (12.8°C).

The highest recorded temperature in Ontario is 114.0°F (45.6°C), which was recorded in July. The lowest recorded temperature in Ontario is 24.0°F (-4.4°C), which was recorded in December.