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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 Union is 51.2°F (10.7°C). The warmest month, on average, is July with an average temperature of 64.3°F (17.9°C). The coolest month on average is December, with an average temperature of 39.5°F (4.2°C).
The highest recorded temperature in Union is 97.0°F (36.1°C), which was recorded in August. The lowest recorded temperature in Union is 11.0°F (-11.7°C), which was recorded in January.
The average amount of precipitation for the year in Union is 89.1" (2263.1 mm). The month with the most precipitation on average is December with 15.8" (401.3 mm) of precipitation. The month with the least precipitation on average is July with an average of 1.1" (27.9 mm). There are an average of 168.0 days of precipitation, with the most precipitation occurring in November with 21.0 days and the least precipitation occurring in July with 6.0 days.
In Union, there's an average of 5.8" of snow (0 cm). The month with the most snow is January, with 1.8" of snow (4.6 cm).