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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 65.5°F (18.6°C). The warmest month, on average, is August with an average temperature of 79.1°F (26.2°C). The coolest month on average is December, with an average temperature of 54.1°F (12.3°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.
The average amount of precipitation for the year in Ontario is 15.0" (381 mm). The month with the most precipitation on average is February with 3.4" (86.4 mm) of precipitation. The month with the least precipitation on average is June with an average of 0.1" (2.5 mm).