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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 Santarem is 60.8°F (16°C). The warmest month, on average, is August with an average temperature of 72.9°F (22.7°C). The coolest month on average is January, with an average temperature of 49.3°F (9.6°C).
The highest recorded temperature in Santarem is 110.3°F (43.5°C), which was recorded in June. The lowest recorded temperature in Santarem is 69.1°F (20.6°C), which was recorded in January.
The average amount of precipitation for the year in Santarem is 27.4" (696 mm). The month with the most precipitation on average is December with 4.1" (104.1 mm) of precipitation. The month with the least precipitation on average is August with an average of 0.2" (5.1 mm). There are an average of 98.7 days of precipitation, with the most precipitation occurring in December with 12.7 days and the least precipitation occurring in July with 1.7 days.
In terms of liquid precipitation, there are an average of 67.6 days of rain, with the most rain occurring in December with 9.3 days of rain, and the least rain occurring in August with 0.1 days of rain.