A confluent trough developed across the Northern Plains and locked in the cold air which had pushed southward and produced numerous record low maximum and minimum temperatures.  As an extended period of warm advection and frontogenesis intensified during the afternoon of October 24, a broad area of snowfall developed, with periods of moderate to briefly heavy snowfall during the morning and early afternoon of October 25. Numerous snowfall records were established on October 24th and 25th to go along with the record cold temperatures, which also propelled the month into the top 3 snowiest Octobers at Brookings, Flandreau, Marshall, Minneota, Tracy and Yankton (1st), Windom and De Smet (2nd), and Sibley, Sanborn and Pipestone (3rd).

Winter Weather in JERAULD, SOUTH DAKOTA
From 24-OCT-20 11:00:00 to 25-OCT-20 11:00:00 (CST-6)
Reported by: COOP Observer

A long duration snowfall totaled 5.0 inches at Wessington Springs.

Winter Weather in BEADLE, SOUTH DAKOTA
From 24-OCT-20 11:00:00 to 25-OCT-20 11:00:00 (CST-6)
Reported by: Official NWS Observations

Snowfall totaled 4.5 inches 1 mile south of Huron and 3.5 at Huron.

Winter Weather in BRULE, SOUTH DAKOTA
From 24-OCT-20 09:30:00 to 25-OCT-20 11:00:00 (CST-6)
Reported by: COOP Observer

A long duration snowfall totaled 5.2 inches at Chamberlain and 4.0 inches 8 miles north northeast of Chamberlain.

Winter Weather in AURORA, SOUTH DAKOTA
From 24-OCT-20 11:00:00 to 25-OCT-20 11:00:00 (CST-6)
Reported by: COOP Observer

Snowfall totaled 5.5 inches 4 miles southwest of Stickney and 4.2 inches at White Lake.

Winter Weather in DOUGLAS, SOUTH DAKOTA
From 24-OCT-20 11:00:00 to 25-OCT-20 11:00:00 (CST-6)
Reported by: CoCoRaHS

A long duration snowfall totaled 8.0 inches 5 miles west of Armour and 4.8 inches 10 miles west of Dimock.

Winter Storm in GREGORY, SOUTH DAKOTA
From 24-OCT-20 10:00:00 to 25-OCT-20 11:00:00 (CST-6)
Reported by: CoCoRaHS

Snowfall totaled 8.0 inches 9 miles north of Gregory.

Winter Weather in CHARLES MIX, SOUTH DAKOTA
From 24-OCT-20 12:00:00 to 25-OCT-20 11:00:00 (CST-6)
Reported by: COOP Observer

A long duration snowfall totaled 6.1 inches near Wagner, 5.8 inches 3 miles south of Dante and 5.0 inches 2 miles northeast of Academy.

Winter Weather in SANBORN, SOUTH DAKOTA
From 24-OCT-20 12:00:00 to 25-OCT-20 12:00:00 (CST-6)
Reported by: COOP Observer

Snowfall totaled 4.0 inches at Woonsocket and 3.0 inches 4 miles north northeast of Forestburg.

Winter Weather in DAVISON, SOUTH DAKOTA
From 24-OCT-20 13:00:00 to 25-OCT-20 12:30:00 (CST-6)
Reported by: COOP Observer

Snowfall totaled 5.1 inches 1 mile south southeast of Mitchell and 4.5 inches at Mitchell.

Winter Weather in KINGSBURY, SOUTH DAKOTA
From 24-OCT-20 13:00:00 to 25-OCT-20 12:00:00 (CST-6)
Reported by: Official NWS Observations

Snowfall totaled 4.8 inches at De Smet and 3.8 inches at Iroquois.

Winter Weather in BROOKINGS, SOUTH DAKOTA
From 24-OCT-20 13:00:00 to 25-OCT-20 13:00:00 (CST-6)
Reported by: COOP Observer

A long-duration snowfall totaled 6.3 inches at Brookings and 4.5 inches 1 mile south of Brookings.

Winter Weather in MINER, SOUTH DAKOTA
From 24-OCT-20 13:00:00 to 25-OCT-20 13:00:00 (CST-6)
Reported by: COOP Observer

Snowfall totaled 4.0 inches at Howard.

Winter Weather in LAKE, SOUTH DAKOTA
From 24-OCT-20 12:00:00 to 25-OCT-20 12:00:00 (CST-6)
Reported by: COOP Observer

A long-duration snowfall totaled 5.6 inches 2 miles north of Chester and 5.0 inches 2 miles south of Winfred.

Winter Weather in MOODY, SOUTH DAKOTA
From 24-OCT-20 12:30:00 to 25-OCT-20 14:00:00 (CST-6)
Reported by: COOP Observer

Snowfall totaled 3.9 inches at Flandreau and 3.5 inches 11 miles north of Colman.

Winter Weather in HANSON, SOUTH DAKOTA
From 24-OCT-20 13:00:00 to 25-OCT-20 12:30:00 (CST-6)
Reported by: COOP Observer

Snowfall totaled 4.4 inches at Alexandria.

Winter Weather in MCCOOK, SOUTH DAKOTA
From 24-OCT-20 13:00:00 to 25-OCT-20 14:00:00 (CST-6)
Reported by: COOP Observer

Snowfall totaled 4.8 inches 6 miles northwest of Montrose and 4.0 inches at Bridgewater.

Winter Weather in MINNEHAHA, SOUTH DAKOTA
From 24-OCT-20 12:30:00 to 25-OCT-20 15:00:00 (CST-6)
Reported by: Official NWS Observations

Snowfall totaled 5.5 inches at Colton, 4.3 inches at Sioux Falls and 4.1 inches near Garretson.

Winter Weather in HUTCHINSON, SOUTH DAKOTA
From 24-OCT-20 13:00:00 to 25-OCT-20 14:00:00 (CST-6)
Reported by: COOP Observer

Snowfall totaled 5.0 inches at Menno and 4.0 inches at Parkston.

Winter Weather in TURNER, SOUTH DAKOTA
From 24-OCT-20 13:00:00 to 25-OCT-20 14:00:00 (CST-6)
Reported by: CoCoRaHS

Snowfall totaled 5.3 inches at Hurley and 3.1 inches at Marion.

Winter Weather in LINCOLN, SOUTH DAKOTA
From 24-OCT-20 13:00:00 to 25-OCT-20 15:00:00 (CST-6)
Reported by: COOP Observer

Snowfall totaled 4.2 inches at Canton and 3.5 inches near Harrisburg.

Winter Weather in BON HOMME, SOUTH DAKOTA
From 24-OCT-20 13:00:00 to 25-OCT-20 14:00:00 (CST-6)
Reported by: COOP Observer

Snowfall totaled 6.0 inches 8 miles west northwest of Springfield and 4.8 inches at Tyndall.

Winter Weather in YANKTON, SOUTH DAKOTA
From 24-OCT-20 14:00:00 to 25-OCT-20 14:00:00 (CST-6)
Reported by: COOP Observer

Snowfall totaled 6.0 inches at Yankton.

Winter Weather in CLAY, SOUTH DAKOTA
From 24-OCT-20 15:00:00 to 25-OCT-20 15:00:00 (CST-6)
Reported by: COOP Observer

Snowfall totaled 4.7 inches at Vermillion and 4.0 inches 6 miles southeast of Centerville.

Winter Weather in UNION, SOUTH DAKOTA
From 24-OCT-20 18:00:00 to 25-OCT-20 15:00:00 (CST-6)
Reported by: CoCoRaHS

Snowfall totaled 4.5 inches 6 miles north northeast of Elk Point.