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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 Kelso is 51.0°F (10.6°C). The warmest month, on average, is July with an average temperature of 64.0°F (17.8°C). The coolest month on average is January, with an average temperature of 38.0°F (3.3°C).
The highest recorded temperature in Kelso is 105.0°F (40.6°C), which was recorded in July. The lowest recorded temperature in Kelso is -20.0°F (-28.9°C), which was recorded in January.
The average amount of precipitation for the year in Kelso is 43.4" (1102.4 mm). The month with the most precipitation on average is December with 7.1" (180.3 mm) of precipitation. The month with the least precipitation on average is July with an average of 0.7" (17.8 mm). There are an average of 163.0 days of precipitation, with the most precipitation occurring in December with 22.0 days and the least precipitation occurring in July with 3.0 days.
In terms of liquid precipitation, there are an average of 74.7 days of rain, with the most rain occurring in December with 10.8 days of rain, and the least rain occurring in July with 1.8 days of rain.
In Kelso, there's an average of 18.5" of snow (0 cm). The month with the most snow is January, with 10.8" of snow (27.4 cm).