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Farley, IA Weather. Farley, IA climate is warm during summer when temperatures tend to be in the 70's and extremely cold during winter when temperatures tend to be in the 10's.
Average Weather in Mason City Iowa, United States. In Mason City, the summers are long, warm, and wet; the winters are freezing, snowy, and windy; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 10Â°F to 83Â°F and is rarely below -10Â°F or above 91Â°F.