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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. Many of the regions with Mediterranean climates have relatively mild winters and very warm summers.
The Köppen Climate Classification subtype for this climate is "Csa". (Mediterran Climate).
The average temperature for the year in Castelo Branco is 60.3°F (15.7°C). The warmest month, on average, is July with an average temperature of 77.0°F (25°C). The coolest month on average is January, with an average temperature of 46.2°F (7.9°C).
The highest recorded temperature in Castelo Branco is 105.1°F (40.6°C), which was recorded in July. The lowest recorded temperature in Castelo Branco is 25.0°F (-3.9°C), which was recorded in January.
The average amount of precipitation for the year in Castelo Branco is 29.9" (759.5 mm). The month with the most precipitation on average is December with 5.0" (127 mm) of precipitation. The month with the least precipitation on average is August with an average of 0.3" (7.6 mm). There are an average of 112.5 days of precipitation, with the most precipitation occurring in December with 14.3 days and the least precipitation occurring in August with 2.6 days.