Snow event in United States, 11 to 21 October 2021

Name: Snow event in United States, 11 to 21 October 2021
Start: 2021-10-11
End: 2021-10-21
Location: United States

Snow event in United States, 11 to 21 October 2021: 457 records at 187 stations, peak on 13 October 2021. Closed.

Data as of 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Key Facts

Snow event in United States, 11 to 21 October 2021 set or tied 457 station records at 187 stations.
It ran from 11 October 2021 to 21 October 2021 (11 days) and its peak day was 13 October 2021.
Status: closed.
Wibaux 2 E set a daily record snowfall of 30.5 cm (12.0 in) on 15 October 2021.
The busiest day was 13 October 2021 with 142 records.
The oldest broken record in the ranked list had stood for 129 years.

Footprint

11 to 21 October 2021

The area covered by Snow event in United States, 11 to 21 October 2021 is outlined, with 18 of the stations that set records marked, coloured by record type. Made with Natural Earth.

Footprint of Snow event in United States, 11 to 21 October 2021: stations that set records in the event
Station	Type	Value	Date
Wibaux 2 E	Record daily snowfall	30.5 cm (12.0 in)	2021-10-15
Biddle	Record daily snowfall	20.3 cm (8.0 in)	2021-10-13
Kaycee	Record snow depth	17.8 cm (7.0 in)	2021-10-13
Sonnette 7 SW	Record snow depth	38.1 cm (15.0 in)	2021-10-12
Silverton	Record daily snowfall	23.9 cm (9.4 in)	2021-10-11
Ekalaka	Record snow depth	22.9 cm (9.0 in)	2021-10-15
Logan Utah St UNIV	Record daily snowfall	17.8 cm (7.0 in)	2021-10-12
Glendive	Record daily snowfall	12.7 cm (5.0 in)	2021-10-13
Hill City	Record daily snowfall	50.8 cm (20.0 in)	2021-10-13
Wamsutter	Record snow depth	12.7 cm (5.0 in)	2021-10-13
Camp Crook	Record snow depth	27.9 cm (11.0 in)	2021-10-14
Ely AP	Record snow depth	13.0 cm (5.1 in)	2021-10-12
Lamar Rs	Record daily snowfall	18.5 cm (7.3 in)	2021-10-12
Yellowstone Park Mammoth	Record daily snowfall	15.2 cm (6.0 in)	2021-10-12
Ridgeway 1 S	Record snow depth	20.3 cm (8.0 in)	2021-10-14
Dillinger	Record snow depth	25.4 cm (10.0 in)	2021-10-13
Powderville 8 NNE	Record snow depth	20.3 cm (8.0 in)	2021-10-14
Bright Angel Rs	Record daily snowfall	30.5 cm (12.0 in)	2021-10-12

Records per Day

Peak day 142

Records set or tied each day from 11 October 2021 to 21 October 2021. The most in one day was 142 on 13 October 2021.

Records per day during Snow event in United States, 11 to 21 October 2021
Date	Records
2021-10-11	30
2021-10-12	127
2021-10-13	142
2021-10-14	69
2021-10-15	39
2021-10-16	17
2021-10-17	4
2021-10-18	2
2021-10-19	13
2021-10-20	13
2021-10-21	1

Top Records by Margin

Margin over the record replaced

Top records of Snow event in United States, 11 to 21 October 2021 ranked by margin
Hill City, 10-13	46.0 cm (18.1 in)
Hill City, 10-13	35.5 cm (14.0 in)
Bright Angel Rs, 10-12	26.7 cm (10.5 in)
Camp Crook, 10-14	25.4 cm (10.0 in)
Dillinger, 10-13	25.4 cm (10.0 in)
Wibaux 2 E, 10-15	24.1 cm (9.5 in)
Ridgeway 1 S, 10-14	20.3 cm (8.0 in)
Powderville 8 NNE, 10-14	20.3 cm (8.0 in)
Silverton, 10-11	20.1 cm (7.9 in)
Biddle, 10-13	17.8 cm (7.0 in)
Kaycee, 10-13	17.8 cm (7.0 in)
Sonnette 7 SW, 10-12	17.8 cm (7.0 in)
Logan Utah St UNIV, 10-12	17.8 cm (7.0 in)
Ekalaka, 10-15	15.3 cm (6.0 in)
Glendive, 10-13	12.7 cm (5.0 in)

Margin is how far the new value is beyond the record it replaced. Ties are not shown.

Margin Against Age of the Broken Record

457 records plotted by how far they beat the old record (across) and how many years the old record had stood (up). Long standing records beaten by a wide margin sit in the top right.

Margin against age of the broken record in Snow event in United States, 11 to 21 October 2021
Margin (mm)	Years the old record stood
241	102
178	102
178	120
178	50
201	96
153	121
127	127
460	55
178	118
127	123
254	52
105	121
203	68
109	96
101	121
203	56
355	55
254	72
102	120
267	74
406	56
127	100
102	102
203	50
127	100
152	70
127	82
224	24
257	8
51	88
203	72
127	104
26	108
76	121
152	68
152	68
153	102
76	96
63	92
127	72
102	112
254	12
76	121
89	107
127	72
66	121
254	74
127	68
102	106
152	92
89	104
76	50
102	92
89	102
102	72
102	72
107	70
51	108
51	106
51	106
38	115
127	31
51	119
38	123
51	123
107	56
86	92
76	112
178	12
51	121
50	96
152	40
178	38
89	72
51	96
51	96
102	68
51	59
191	75
53	49
127	80
102	72
25	129
36	108
127	12
102	56
102	13
38	126
76	95
102	68
26	121
51	94
30	99
51	91
76	92
139	52
107	16
48	96
38	110
33	102
101	48
51	100
152	26
25	121
25	108
89	58
25	108
241	3
51	72
152	28
25	116
166	24
127	55
115	40
76	75
51	123
25	126
25	104
51	88
178	55
102	62
76	92
25	120
51	64
25	111
178	59
76	72
51	102
76	72
109	52
13	121
102	63
13	126
51	59
102	51
76	82
102	16
51	82
153	68
13	106
25	118
51	92
61	76
13	96
25	123
25	94
102	13
18	127
127	72
102	63
25	91
5	121
153	40
77	40
102	52
76	68
178	55
102	71
56	72
25	96
5	120
25	72
25	92
51	64
76	56
76	56
127	72
66	40
102	62
178	52
61	72
76	64
76	54
104	52
8	91
51	70
102	0
102	70
38	66
26	88
127	66
76	72
76	72
102	55
51	72
30	72
88	52
61	64
86	52
76	52
51	72
76	72
25	88
25	72
102	40
153	52
102	35
51	72
51	72
51	72

Compared With Other Events

Station records per event

Station records in Snow event in United States, 11 to 21 October 2021 compared with similar events
Snow event in United States, 3 to 27 January 2024	2,190 records
Snow event in United States, 24 November to 22 December 2025	1,539 records
Snow event in United States, 9 to 29 April 2022	1,475 records
Snow event in United States, 27 September to 17 October 2018	1,247 records
Snow event in United States, 26 September to 23 October 2019	1,194 records
Snow event in United States, 11 to 21 October 2021 (this event)	457 records

Every Record Set

20 of 457

Every record set or tied during Snow event in United States, 11 to 21 October 2021, in date order
Date	Station	Record	Value	Margin	Years stood	Significance
2021-10-11	Silverton	Record daily snowfall	23.9 cm (9.4 in)	20.1 cm (7.9 in)	96	69 of 100 (Major)
2021-10-12	Sonnette 7 SW	Record snow depth	38.1 cm (15.0 in)	17.8 cm (7.0 in)	50	70 of 100 (Major)
2021-10-12	Logan Utah St UNIV	Record daily snowfall	17.8 cm (7.0 in)	17.8 cm (7.0 in)	118	66 of 100 (Major)
2021-10-12	Ely AP	Record snow depth	13.0 cm (5.1 in)	10.5 cm (4.1 in)	121	64 of 100 (Major)
2021-10-12	Lamar Rs	Record daily snowfall	18.5 cm (7.3 in)	10.9 cm (4.3 in)	96	63 of 100 (Major)
2021-10-12	Yellowstone Park Mammoth	Record daily snowfall	15.2 cm (6.0 in)	10.1 cm (4.0 in)	121	63 of 100 (Major)
2021-10-12	Bright Angel Rs	Record daily snowfall	30.5 cm (12.0 in)	26.7 cm (10.5 in)	74	61 of 100 (Major)
2021-10-13	Biddle	Record daily snowfall	20.3 cm (8.0 in)	17.8 cm (7.0 in)	102	75 of 100 (Major)
2021-10-13	Kaycee	Record snow depth	17.8 cm (7.0 in)	17.8 cm (7.0 in)	120	74 of 100 (Major)
2021-10-13	Glendive	Record daily snowfall	12.7 cm (5.0 in)	12.7 cm (5.0 in)	127	66 of 100 (Major)
2021-10-13	Hill City	Record daily snowfall	50.8 cm (20.0 in)	46.0 cm (18.1 in)	55	66 of 100 (Major)
2021-10-13	Wamsutter	Record snow depth	12.7 cm (5.0 in)	12.7 cm (5.0 in)	123	66 of 100 (Major)
2021-10-13	Hill City	Record snow depth	40.6 cm (16.0 in)	35.5 cm (14.0 in)	55	62 of 100 (Major)
2021-10-13	Dillinger	Record snow depth	25.4 cm (10.0 in)	25.4 cm (10.0 in)	72	62 of 100 (Major)
2021-10-13	Kaycee	Record daily snowfall	10.2 cm (4.0 in)	10.2 cm (4.0 in)	120	62 of 100 (Major)
2021-10-14	Camp Crook	Record snow depth	27.9 cm (11.0 in)	25.4 cm (10.0 in)	52	65 of 100 (Major)
2021-10-14	Ridgeway 1 S	Record snow depth	20.3 cm (8.0 in)	20.3 cm (8.0 in)	68	63 of 100 (Major)
2021-10-14	Powderville 8 NNE	Record snow depth	20.3 cm (8.0 in)	20.3 cm (8.0 in)	56	62 of 100 (Major)
2021-10-15	Wibaux 2 E	Record daily snowfall	30.5 cm (12.0 in)	24.1 cm (9.5 in)	102	76 of 100 (Major)
2021-10-15	Ekalaka	Record snow depth	22.9 cm (9.0 in)	15.3 cm (6.0 in)	121	67 of 100 (Major)

The daily ledgers keep a limited number of records per day, so this list has 20 of the 457 records the event counts. The counts above use the full total.

Related Headlines

Third party news, headline and link only

Download the Data

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-17. Events are found by this site from station records and are not official designations. Records are provisional until reprocessed.

Margin (mm)	Years the old record stood
241	102
178	102
178	120
178	50
201	96
153	121
127	127
460	55
178	118
127	123
254	52
105	121
203	68
109	96
101	121
203	56
355	55
254	72
102	120
267	74
406	56
127	100
102	102
203	50
127	100
152	70
127	82
224	24
257	8
51	88
203	72
127	104
26	108
76	121
152	68
152	68
153	102
76	96
63	92
127	72
102	112
254	12
76	121
89	107
127	72
66	121
254	74
127	68
102	106
152	92
89	104
76	50
102	92
89	102
102	72
102	72
107	70
51	108
51	106
51	106
38	115
127	31
51	119
38	123
51	123
107	56
86	92
76	112
178	12
51	121
50	96
152	40
178	38
89	72
51	96
51	96
102	68
51	59
191	75
53	49
127	80
102	72
25	129
36	108
127	12
102	56
102	13
38	126
76	95
102	68
26	121
51	94
30	99
51	91
76	92
139	52
107	16
48	96
38	110
33	102
101	48
51	100
152	26
25	121
25	108
89	58
25	108
241	3
51	72
152	28
25	116
166	24
127	55
115	40
76	75
51	123
25	126
25	104
51	88
178	55
102	62
76	92
25	120
51	64
25	111
178	59
76	72
51	102
76	72
109	52
13	121
102	63
13	126
51	59
102	51
76	82
102	16
51	82
153	68
13	106
25	118
51	92
61	76
13	96
25	123
25	94
102	13
18	127
127	72
102	63
25	91
5	121
153	40
77	40
102	52
76	68
178	55
102	71
56	72
25	96
5	120
25	72
25	92
51	64
76	56
76	56
127	72
66	40
102	62
178	52
61	72
76	64
76	54
104	52
8	91
51	70
102	0
102	70
38	66
26	88
127	66
76	72
76	72
102	55
51	72
30	72
88	52
61	64
86	52
76	52
51	72
76	72
25	88
25	72
102	40
153	52
102	35
51	72
51	72
51	72

Margin (mm)	Years the old record stood
241	102
178	102
178	120
178	50
201	96
153	121
127	127
460	55
178	118
127	123
254	52
105	121
203	68
109	96
101	121
203	56
355	55
254	72
102	120
267	74
406	56
127	100
102	102
203	50
127	100
152	70
127	82
224	24
257	8
51	88
203	72
127	104
26	108
76	121
152	68
152	68
153	102
76	96
63	92
127	72
102	112
254	12
76	121
89	107
127	72
66	121
254	74
127	68
102	106
152	92
89	104
76	50
102	92
89	102
102	72
102	72
107	70
51	108
51	106
51	106
38	115
127	31
51	119
38	123
51	123
107	56
86	92
76	112
178	12
51	121
50	96
152	40
178	38
89	72
51	96
51	96
102	68
51	59
191	75
53	49
127	80
102	72
25	129
36	108
127	12
102	56
102	13
38	126
76	95
102	68
26	121
51	94
30	99
51	91
76	92
139	52
107	16
48	96
38	110
33	102
101	48
51	100
152	26
25	121
25	108
89	58
25	108
241	3
51	72
152	28
25	116
166	24
127	55
115	40
76	75
51	123
25	126
25	104
51	88
178	55
102	62
76	92
25	120
51	64
25	111
178	59
76	72
51	102
76	72
109	52
13	121
102	63
13	126
51	59
102	51
76	82
102	16
51	82
153	68
13	106
25	118
51	92
61	76
13	96
25	123
25	94
102	13
18	127
127	72
102	63
25	91
5	121
153	40
77	40
102	52
76	68
178	55
102	71
56	72
25	96
5	120
25	72
25	92
51	64
76	56
76	56
127	72
66	40
102	62
178	52
61	72
76	64
76	54
104	52
8	91
51	70
102	0
102	70
38	66
26	88
127	66
76	72
76	72
102	55
51	72
30	72
88	52
61	64
86	52
76	52
51	72
76	72
25	88
25	72
102	40
153	52
102	35
51	72
51	72
51	72

Margin (mm)	Years the old record stood
241	102
178	102
178	120
178	50
201	96
153	121
127	127
460	55
178	118
127	123
254	52
105	121
203	68
109	96
101	121
203	56
355	55
254	72
102	120
267	74
406	56
127	100
102	102
203	50
127	100
152	70
127	82
224	24
257	8
51	88
203	72
127	104
26	108
76	121
152	68
152	68
153	102
76	96
63	92
127	72
102	112
254	12
76	121
89	107
127	72
66	121
254	74
127	68
102	106
152	92
89	104
76	50
102	92
89	102
102	72
102	72
107	70
51	108
51	106
51	106
38	115
127	31
51	119
38	123
51	123
107	56
86	92
76	112
178	12
51	121
50	96
152	40
178	38
89	72
51	96
51	96
102	68
51	59
191	75
53	49
127	80
102	72
25	129
36	108
127	12
102	56
102	13
38	126
76	95
102	68
26	121
51	94
30	99
51	91
76	92
139	52
107	16
48	96
38	110
33	102
101	48
51	100
152	26
25	121
25	108
89	58
25	108
241	3
51	72
152	28
25	116
166	24
127	55
115	40
76	75
51	123
25	126
25	104
51	88
178	55
102	62
76	92
25	120
51	64
25	111
178	59
76	72
51	102
76	72
109	52
13	121
102	63
13	126
51	59
102	51
76	82
102	16
51	82
153	68
13	106
25	118
51	92
61	76
13	96
25	123
25	94
102	13
18	127
127	72
102	63
25	91
5	121
153	40
77	40
102	52
76	68
178	55
102	71
56	72
25	96
5	120
25	72
25	92
51	64
76	56
76	56
127	72
66	40
102	62
178	52
61	72
76	64
76	54
104	52
8	91
51	70
102	0
102	70
38	66
26	88
127	66
76	72
76	72
102	55
51	72
30	72
88	52
61	64
86	52
76	52
51	72
76	72
25	88
25	72
102	40
153	52
102	35
51	72
51	72
51	72