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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 Santa Rosa is 57.6°F (14.2°C). The warmest month, on average, is July with an average temperature of 67.5°F (19.7°C). The coolest month on average is December, with an average temperature of 46.4°F (8°C).
The highest recorded temperature in Santa Rosa is 109.0°F (42.8°C), which was recorded in September. The lowest recorded temperature in Santa Rosa is 23.0°F (-5°C), which was recorded in December.
The average amount of precipitation for the year in Santa Rosa is 36.3" (922 mm). The month with the most precipitation on average is January with 7.1" (180.3 mm) of precipitation. The month with the least precipitation on average is July with an average of 0.0" (0 mm). In terms of liquid precipitation, there are an average of 44.6 days of rain, with the most rain occurring in November with 7.7 days of rain, and the least rain occurring in July with 0.0 days of rain.