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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 Georgetown is 60.0°F (15.6°C). The warmest month, on average, is January with an average temperature of 73.0°F (22.8°C). The coolest month on average is July, with an average temperature of 48.0°F (8.9°C).
The highest recorded temperature in Georgetown is 111.0°F (43.9°C), which was recorded in January. The lowest recorded temperature in Georgetown is 20.0°F (-6.7°C), which was recorded in July.
The average amount of precipitation for the year in Georgetown is 18.0" (457.2 mm). The month with the most precipitation on average is May with 2.0" (50.8 mm) of precipitation. The month with the least precipitation on average is January with an average of 0.0" (0 mm). In terms of liquid precipitation, there are an average of 89.0 days of rain, with the most rain occurring in July with 12.4 days of rain, and the least rain occurring in February with 2.9 days of rain.