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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. Many of the regions with Mediterranean climates have relatively mild winters and very warm summers.
The Köppen Climate Classification subtype for this climate is "Csa". (Mediterran Climate).
The average temperature for the year in El Cajon - Gillespie Field is 65.3°F (18.5°C). The warmest month, on average, is August with an average temperature of 76.6°F (24.8°C). The coolest month on average is December, with an average temperature of 55.0°F (12.8°C).
The highest recorded temperature in El Cajon - Gillespie Field is 111.0°F (43.9°C), which was recorded in September. The lowest recorded temperature in El Cajon - Gillespie Field is 22.0°F (-5.6°C), which was recorded in January.
The average amount of precipitation for the year in El Cajon - Gillespie Field is 12.3" (312.4 mm). The month with the most precipitation on average is February with 2.6" (66 mm) of precipitation. The month with the least precipitation on average is August with an average of 0.0" (0 mm). There are an average of 33.3 days of precipitation, with the most precipitation occurring in February with 6.1 days and the least precipitation occurring in August with 0.3 days.