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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 Eureka is 53.0°F (11.7°C). The warmest month, on average, is August with an average temperature of 58.0°F (14.4°C). The coolest month on average is January, with an average temperature of 48.0°F (8.9°C).
The highest recorded temperature in Eureka is 87.0°F (30.6°C), which was recorded in October. The lowest recorded temperature in Eureka is 21.0°F (-6.1°C), which was recorded in December.
The average amount of precipitation for the year in Eureka is 38.0" (965.2 mm). The month with the most precipitation on average is January with 6.4" (162.6 mm) of precipitation. The month with the least precipitation on average is July with an average of 0.2" (5.1 mm). In terms of liquid precipitation, there are an average of 117.0 days of rain, with the most rain occurring in January with 16.0 days of rain, and the least rain occurring in July with 2.0 days of rain.