Daytime highs during the month of March average 47˚ with a low of 22˚, high of 56˚/ low of 31˚ in April with May enjoying an average high of 66˚ and a low of 42˚. Overnight temperatures are still chilly, especially in Black Hills communities, where the lows averaging 20˚ or more are made.
Late spring is western South Dakota’s rainy season, when the area receives over a third of its annual moisture. Precipitation in May comes mostly in short rain showers and this is typically the wettest month. March is one of the driest but usually late March and sometimes even April snow showers can dump sizeable amounts. The ski town of Lead averages 66 in of snow during these two months!
