May 1, 1959:
Aberdeen recorded a high temperature of 102, which is the earliest date that Aberdeen reached 100 degrees.
May 1, 1967:
The latest blizzard ever record for South Dakota ended on this day. Snowfall amounts in the west were generally 5 to 12 inches with a 16 inch report in Lemmon and 30 inches in the northern Black Hills. Winds of 40 to 50 mph caused blowing snow which occasionally reduced visibility to near zero and snow drifts of 4 to 5 feet. Other snowfall amounts include, 5 inches in Murdo and 6 miles SE of McIntosh; and 4 inches in Timber Lake.
May 1, 1997:
Heavy rains of 1.5 to 2.5 inches with an isolated 4.5 inch report fell over central South Dakota and caused flooding to several creeks, streams, low-lying areas, and roads. This early May rain only aggravated the areas flooded in March and April. Lyman County experienced the most significant flooding where 4.5 inches of rain fell, north of Vivian. Part of a golf course was flooded and some personal property

was flooded along with the KOA campground near Kennebec. Some rainfall amounts include, 2.5 inches 7 miles NW of Presho, and 2.01 inches near Stephan.
1895:  A tornado that was nearly a mile wide produced F5 level damage along a 22 mile long path on farms northwest of Wichita, KS. Two families suffered four fatalities each when they hesitated before heading for the storm cellar. The massive width of the tornado may have made it difficult to recognize as a funnel.