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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 Ellensburg is 47.0°F (8.3°C). The warmest month, on average, is July with an average temperature of 69.0°F (20.6°C). The coolest month on average is January, with an average temperature of 23.0°F (-5°C).
The highest recorded temperature in Ellensburg is 103.0°F (39.4°C), which was recorded in July. The lowest recorded temperature in Ellensburg is -29.0°F (-33.9°C), which was recorded in January.
The average amount of precipitation for the year in Ellensburg is 9.1" (231.1 mm). The month with the most precipitation on average is December with 1.5" (38.1 mm) of precipitation. The month with the least precipitation on average is August with an average of 0.2" (5.1 mm). In terms of liquid precipitation, there are an average of 23.5 days of rain, with the most rain occurring in January with 3.5 days of rain, and the least rain occurring in August with 0.7 days of rain.
In Ellensburg, there's an average of 39.8" of snow (101.1 cm). The month with the most snow is January, with 15.2" of snow (38.6 cm).