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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 Viseu is 56.5°F (13.6°C). The warmest month, on average, is July with an average temperature of 70.5°F (21.4°C). The coolest month on average is January, with an average temperature of 44.4°F (6.9°C).
The highest recorded temperature in Viseu is 104.9°F (40.5°C), which was recorded in July. The lowest recorded temperature in Viseu is 18.9°F (-7.3°C), which was recorded in February.
The average amount of precipitation for the year in Viseu is 46.1" (1170.9 mm). The month with the most precipitation on average is December with 7.7" (195.6 mm) of precipitation. The month with the least precipitation on average is August with an average of 0.7" (17.8 mm). There are an average of 116.1 days of precipitation, with the most precipitation occurring in December with 14.2 days and the least precipitation occurring in August with 3.0 days.