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This climate type occurs primarily on the periphery of the true deserts in low-latitude semiarid steppe regions. It is transitional to the tropical wet-dry climate on the equatorward side and to the mediterranean climate on its poleward margin, with a cooler, wetter winter resulting from the higher latitude and mid-latitude frontal cyclone activity. Annual precipitation totals are greater than in tropical and subtropical desert climates. Yearly variations in amount are not as extreme as in the true deserts but are nevertheless large.
The K�ppen Climate Classification subtype for this climate is "BSk". (Tropical and Subtropical Steppe Climate).
The average temperature for the year in Acton is 47.3°F (8.5°C). The warmest month, on average, is July with an average temperature of 72.5°F (22.5°C). The coolest month on average is January, with an average temperature of 23.6°F (-4.7°C).
The highest recorded temperature in Acton is 108.0°F (42.2°C), which was recorded in July. The lowest recorded temperature in Acton is -32.0°F (-35.6°C), which was recorded in December.
The average amount of precipitation for the year in Acton is 14.3" (363.2 mm). The month with the most precipitation on average is May with 2.3" (58.4 mm) of precipitation. The month with the least precipitation on average is February with an average of 0.6" (15.2 mm). There are an average of 97.0 days of precipitation, with the most precipitation occurring in May with 12.0 days and the least precipitation occurring in August with 6.0 days.
In Acton, there's an average of 59.0" of snow (0 cm). The month with the most snow is January, with 10.3" of snow (26.2 cm).