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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 Spearfish is 47.1°F (8.4°C). The warmest month, on average, is July with an average temperature of 71.6°F (22°C). The coolest month on average is January, with an average temperature of 24.9°F (-3.9°C).
The highest recorded temperature in Spearfish is 110.0°F (43.3°C), which was recorded in July. The lowest recorded temperature in Spearfish is -62.0°F (-52.2°C), which was recorded in February.
The average amount of precipitation for the year in Spearfish is 20.9" (530.9 mm). The month with the most precipitation on average is June with 3.8" (96.5 mm) of precipitation. The month with the least precipitation on average is January with an average of 0.6" (15.2 mm). There are an average of 82.0 days of precipitation, with the most precipitation occurring in May with 10.0 days and the least precipitation occurring in October with 5.0 days.
In Spearfish, there's an average of 61.2" of snow (155.4 cm). The month with the most snow is March, with 13.0" of snow (33 cm).