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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 Mill Creek is 51.2°F (10.7°C). The warmest month, on average, is August with an average temperature of 63.8°F (17.7°C). The coolest month on average is December, with an average temperature of 39.6°F (4.2°C).
The highest recorded temperature in Mill Creek is 91.0°F (32.8°C), which was recorded in June. The lowest recorded temperature in Mill Creek is 3.0°F (-16.1°C), which was recorded in January.
The average amount of precipitation for the year in Mill Creek is 36.1" (916.9 mm). The month with the most precipitation on average is November with 6.1" (154.9 mm) of precipitation. The month with the least precipitation on average is July with an average of 1.0" (25.4 mm). There are an average of 122.0 days of precipitation, with the most precipitation occurring in January with 15.0 days and the least precipitation occurring in July with 3.0 days.
In terms of liquid precipitation, there are an average of 82.5 days of rain, with the most rain occurring in October with 11.9 days of rain, and the least rain occurring in June with 2.6 days of rain.
In Mill Creek, there's an average of 49.8" of snow (0 cm). The month with the most snow is January, with 16.6" of snow (42.2 cm).