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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 Viana do Castelo is 58.6°F (14.8°C). The warmest month, on average, is July with an average temperature of 68.9°F (20.5°C). The coolest month on average is January, with an average temperature of 49.1°F (9.5°C).
The highest recorded temperature in Viana do Castelo is 101.5°F (38.6°C), which was recorded in June. The lowest recorded temperature in Viana do Castelo is 24.8°F (-4°C), which was recorded in December.
The average amount of precipitation for the year in Viana do Castelo is 57.9" (1470.7 mm). The month with the most precipitation on average is December with 9.0" (228.6 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 153.6 days of precipitation, with the most precipitation occurring in December with 17.3 days and the least precipitation occurring in August with 6.5 days.