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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 Boise is 52.5°F (11.4°C). The warmest month, on average, is July with an average temperature of 75.8°F (24.3°C). The coolest month on average is December, with an average temperature of 30.7°F (-0.7°C).
The highest recorded temperature in Boise is 111.0°F (43.9°C), which was recorded in July. The lowest recorded temperature in Boise is -25.0°F (-31.7°C), which was recorded in December.
The average amount of precipitation for the year in Boise is 11.7" (297.2 mm). The month with the most precipitation on average is December with 1.6" (40.6 mm) of precipitation. The month with the least precipitation on average is August with an average of 0.2" (5.1 mm). There are an average of 87.6 days of precipitation, with the most precipitation occurring in December with 11.8 days and the least precipitation occurring in August with 2.4 days.
In terms of liquid precipitation, there are an average of 90.0 days of rain, with the most rain occurring in January with 12.0 days of rain, and the least rain occurring in July with 2.0 days of rain.
In Boise, there's an average of 19.2" of snow (0 cm). The month with the most snow is December, with 7.0" of snow (17.8 cm).