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Allen, South Dakota, United States has a moderate continental climate. Summers are warm and humid with temperatures ranging from an average high of 22°C (72°F) in June to an average low of 8°C (46°F) in August. Winters are cold and snowy with temperatures ranging from an average high of -7°C (19°F) in December to an average low of -21°C (-6°F) in February. Rainfall is spread throughout the year with an average of 64 mm (2.5 in) in April and an average of 66 mm (2.6 in) in October. Snowfall is also spread throughout the year with an average of 58 cm (23 in) in December and an average of 42 cm (17 in) in April.
As of 2020, the city population is 477.
This map shows the current & 7-day weather forecast, weather alerts, and weather radar for Allen, South Dakota.