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Under the K�ppen 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. Many of the regions with Mediterranean climates have relatively mild winters and very warm summers.
The K�ppen Climate Classification subtype for this climate is "Csa". (Mediterran Climate).
The average temperature for the year in Modesto is 63.7°F (17.6°C). The warmest month, on average, is July with an average temperature of 79.1°F (26.2°C). The coolest month on average is December, with an average temperature of 47.7°F (8.7°C).
The highest recorded temperature in Modesto is 111.0°F (43.9°C), which was recorded in July. The lowest recorded temperature in Modesto is 15.0°F (-9.4°C), which was recorded in December.
The average amount of precipitation for the year in Modesto is 13.1" (332.7 mm). The month with the most precipitation on average is January with 2.6" (66 mm) of precipitation. The month with the least precipitation on average is July with an average of 0.0" (0 mm). There are an average of 55.7 days of precipitation, with the most precipitation occurring in January with 10.3 days and the least precipitation occurring in July with 0.1 days.
In terms of liquid precipitation, there are an average of 28.7 days of rain, with the most rain occurring in January with 4.9 days of rain, and the least rain occurring in July with 0.3 days of rain.