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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 Altavista is 71.2°F (21.8°C). The warmest month, on average, is June with an average temperature of 75.7°F (24.3°C). The coolest month on average is January, with an average temperature of 65.1°F (18.4°C).
The highest recorded temperature in Altavista is 102.2°F (39°C), which was recorded in March. The lowest recorded temperature in Altavista is 33.8°F (1°C), which was recorded in January.
The average amount of precipitation for the year in Altavista is 52.2" (1325.9 mm). The month with the most precipitation on average is July with 13.4" (340.4 mm) of precipitation. The month with the least precipitation on average is March with an average of 0.1" (2.5 mm). In terms of liquid precipitation, there are an average of 89.7 days of rain, with the most rain occurring in July with 20.9 days of rain, and the least rain occurring in April with 0.2 days of rain.