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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 Köppen Climate Classification subtype for this climate is "BSk". (Tropical and Subtropical Steppe Climate).
The average temperature for the year in Trelew is 56.5°F (13.6°C). The warmest month, on average, is January with an average temperature of 71.1°F (21.7°C). The coolest month on average is July, with an average temperature of 42.6°F (5.9°C).
The highest recorded temperature in Trelew is 106.0°F (41.1°C), which was recorded in December. The lowest recorded temperature in Trelew is 70.0°F (21.1°C), which was recorded in July.
The average amount of precipitation for the year in Trelew is 8.3" (210.8 mm). The month with the most precipitation on average is April with 1.1" (27.9 mm) of precipitation. The month with the least precipitation on average is February with an average of 0.4" (10.2 mm). There are an average of 73.0 days of precipitation, with the most precipitation occurring in June with 9.0 days and the least precipitation occurring in January with 4.0 days.
In terms of liquid precipitation, there are an average of 20.0 days of rain, with the most rain occurring in March with 2.9 days of rain, and the least rain occurring in January with 0.6 days of rain.