Extreme rain in United States, 18 to 21 October 2021

Name: Extreme rain in United States, 18 to 21 October 2021
Start: 2021-10-18
End: 2021-10-21
Location: United States

Extreme rain in United States, 18 to 21 October 2021: 125 records at 123 stations, peak on 21 October 2021. Closed.

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

Key Facts

Extreme rain in United States, 18 to 21 October 2021 set or tied 125 station records at 123 stations.
It ran from 18 October 2021 to 21 October 2021 (4 days) and its peak day was 21 October 2021.
Status: closed.
Lander AP set a daily record precipitation of 42.4 mm (1.7 in) on 19 October 2021.
The busiest day was 21 October 2021 with 43 records.
The oldest broken record in the ranked list had stood for 120 years.

Footprint

18 to 21 October 2021

The area covered by Extreme rain in United States, 18 to 21 October 2021 is outlined, with 20 of the stations that set records marked, coloured by record type. Made with Natural Earth.

Footprint of Extreme rain in United States, 18 to 21 October 2021: stations that set records in the event
Station	Type	Value	Date
Lander AP	Record daily precipitation	42.4 mm (1.7 in)	2021-10-19
Waseca S Rsch & Outreach Ctr	Record daily precipitation	44.2 mm (1.7 in)	2021-10-21
Artichoke Lake 1 E	Record daily precipitation	57.7 mm (2.3 in)	2021-10-20
Casper-Natrona Co AP	Record daily precipitation	30.7 mm (1.2 in)	2021-10-19
Canton	Record daily precipitation	27.4 mm (1.1 in)	2021-10-20
Cold Springs	Record daily precipitation	50.8 mm (2.0 in)	2021-10-19
Sioux Ctr 2 SE	Record daily precipitation	33.5 mm (1.3 in)	2021-10-20
Old Ft Laramie	Record daily precipitation	33.0 mm (1.3 in)	2021-10-19
Windy Peak	Record daily precipitation	43.2 mm (1.7 in)	2021-10-19
Milan 1NW	Record daily precipitation	38.1 mm (1.5 in)	2021-10-20
Reno Hill	Record daily precipitation	45.7 mm (1.8 in)	2021-10-19
South Pass	Record daily precipitation	35.6 mm (1.4 in)	2021-10-19
Akron	Record daily precipitation	40.4 mm (1.6 in)	2021-10-21
Medford	Record daily precipitation	25.9 mm (1.0 in)	2021-10-21
Sheldon	Record daily precipitation	27.9 mm (1.1 in)	2021-10-21
Hobbs Park	Record daily precipitation	43.2 mm (1.7 in)	2021-10-19
Sybille Rsch Unit	Record daily precipitation	27.9 mm (1.1 in)	2021-10-19
Pathfinder Dam	Record daily precipitation	17.3 mm (0.7 in)	2021-10-19
Owl Creek	Record daily precipitation	22.9 mm (0.9 in)	2021-10-19
Aberdeen	Record daily precipitation	23.4 mm (0.9 in)	2021-10-20

Records per Day

Peak day 43

Records set or tied each day from 18 October 2021 to 21 October 2021. The most in one day was 43 on 21 October 2021.

Top Records by Margin

Margin over the record replaced

Top records of Extreme rain in United States, 18 to 21 October 2021 ranked by margin
Reno Hill, 10-19	35.5 mm (1.4 in)
Windy Peak, 10-19	33.0 mm (1.3 in)
Lander AP, 10-19	31.0 mm (1.2 in)
Old Ft Laramie, 10-19	31.0 mm (1.2 in)
Artichoke Lake 1 E, 10-20	27.2 mm (1.1 in)
Waseca S Rsch & Outreach Ctr, 10-21	26.9 mm (1.1 in)
South Pass, 10-19	25.4 mm (1.0 in)
Hobbs Park, 10-19	22.9 mm (0.9 in)
Akron, 10-21	22.1 mm (0.9 in)
Cold Springs, 10-19	17.8 mm (0.7 in)
Owl Creek, 10-19	17.8 mm (0.7 in)
Sioux Ctr 2 SE, 10-20	17.0 mm (0.7 in)
Casper-Natrona Co AP, 10-19	16.7 mm (0.7 in)
Sybille Rsch Unit, 10-19	16.7 mm (0.7 in)
Canton, 10-20	13.9 mm (0.5 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

125 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 Extreme rain in United States, 18 to 21 October 2021
Margin (mm)	Years the old record stood
31	64
27	86
27	58
17	64
14	112
9	96
17	87
18	23
31	28
18	22
33	16
11	112
9	115
22	64
8	111
36	28
25	31
8	110
23	35
17	39
8	86
1	120
1	100
7	72
17	31
12	62
6	86
2	88
16	42
5	78
11	31
2	86
10	58
15	28
24	12
23	4
3	64
21	12
2	72
8	39
3	64
7	58
12	16
21	31
9	58
3	58
3	64
5	16
2	58
2	72
3	64
15	31
1	58
5	31
7	56
9	31
19	0
14	12
21	0
7	48
4	42
10	28
2	58
1	58
2	48
12	19
8	35
11	12
3	35
1	42
8	3
12	0
10	12
2	39
15	2
17	2
8	31
7	24
5	24
2	35
5	15
8	31
12	2
3	42
0	42
5	12
10	2
1	31
10	12
3	31
4	31
6	2
2	16
3	16
3	28
3	31
7	0
2	31
8	0
2	6
3	28
3	28
4	16
1	12
5	15
3	16
1	12
1	24
1	16
2	28
8	6
2	16
5	12
6	2
3	4
6	12
3	16
5	2
4	0
0	0
3	11
2	2
6	0
1	16
3	0

Compared With Other Events

Station records per event

Station records in Extreme rain in United States, 18 to 21 October 2021 compared with similar events
Extreme rain in United States and Mexico, 23 February to 15 March 2019	2,223 records
Extreme rain in United States, 3 to 19 January 2024	2,133 records
Extreme rain in Australia, 7 to 26 March 2021	2,099 records
Extreme rain in United States and Mexico, 29 September to 19 October 2018	1,970 records
Extreme rain in United States, 19 December 2022 to 13 January 2023	1,941 records
Extreme rain in United States, 18 to 21 October 2021 (this event)	125 records

Every Record Set

20 of 125

Every record set or tied during Extreme rain in United States, 18 to 21 October 2021, in date order
Date	Station	Record	Value	Margin	Years stood	Significance
2021-10-19	Lander AP	Record daily precipitation	42.4 mm (1.7 in)	31.0 mm (1.2 in)	64	66 of 100 (Major)
2021-10-19	Casper-Natrona Co AP	Record daily precipitation	30.7 mm (1.2 in)	16.7 mm (0.7 in)	64	55 of 100 (Notable)
2021-10-19	Cold Springs	Record daily precipitation	50.8 mm (2.0 in)	17.8 mm (0.7 in)	23	52 of 100 (Notable)
2021-10-19	Old Ft Laramie	Record daily precipitation	33.0 mm (1.3 in)	31.0 mm (1.2 in)	28	51 of 100 (Notable)
2021-10-19	Windy Peak	Record daily precipitation	43.2 mm (1.7 in)	33.0 mm (1.3 in)	16	49 of 100 (Notable)
2021-10-19	Reno Hill	Record daily precipitation	45.7 mm (1.8 in)	35.5 mm (1.4 in)	28	47 of 100 (Notable)
2021-10-19	South Pass	Record daily precipitation	35.6 mm (1.4 in)	25.4 mm (1.0 in)	31	47 of 100 (Notable)
2021-10-19	Hobbs Park	Record daily precipitation	43.2 mm (1.7 in)	22.9 mm (0.9 in)	35	45 of 100 (Notable)
2021-10-19	Sybille Rsch Unit	Record daily precipitation	27.9 mm (1.1 in)	16.7 mm (0.7 in)	39	43 of 100 (Notable)
2021-10-19	Pathfinder Dam	Record daily precipitation	17.3 mm (0.7 in)	9.2 mm (0.36 in)	96	20 of 100 (Routine)
2021-10-19	Owl Creek	Record daily precipitation	22.9 mm (0.9 in)	17.8 mm (0.7 in)	22	20 of 100 (Routine)
2021-10-20	Artichoke Lake 1 E	Record daily precipitation	57.7 mm (2.3 in)	27.2 mm (1.1 in)	58	56 of 100 (Notable)
2021-10-20	Canton	Record daily precipitation	27.4 mm (1.1 in)	13.9 mm (0.5 in)	112	54 of 100 (Notable)
2021-10-20	Sioux Ctr 2 SE	Record daily precipitation	33.5 mm (1.3 in)	17.0 mm (0.7 in)	87	52 of 100 (Notable)
2021-10-20	Milan 1NW	Record daily precipitation	38.1 mm (1.5 in)	9.1 mm (0.36 in)	115	48 of 100 (Notable)
2021-10-20	Aberdeen	Record daily precipitation	23.4 mm (0.9 in)	10.7 mm (0.4 in)	112	20 of 100 (Routine)
2021-10-21	Waseca S Rsch & Outreach Ctr	Record daily precipitation	44.2 mm (1.7 in)	26.9 mm (1.1 in)	86	64 of 100 (Major)
2021-10-21	Akron	Record daily precipitation	40.4 mm (1.6 in)	22.1 mm (0.9 in)	64	47 of 100 (Notable)
2021-10-21	Medford	Record daily precipitation	25.9 mm (1.0 in)	8.1 mm (0.32 in)	111	47 of 100 (Notable)
2021-10-21	Sheldon	Record daily precipitation	27.9 mm (1.1 in)	7.6 mm (0.30 in)	110	46 of 100 (Notable)

The daily ledgers keep a limited number of records per day, so this list has 20 of the 125 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
31	64
27	86
27	58
17	64
14	112
9	96
17	87
18	23
31	28
18	22
33	16
11	112
9	115
22	64
8	111
36	28
25	31
8	110
23	35
17	39
8	86
1	120
1	100
7	72
17	31
12	62
6	86
2	88
16	42
5	78
11	31
2	86
10	58
15	28
24	12
23	4
3	64
21	12
2	72
8	39
3	64
7	58
12	16
21	31
9	58
3	58
3	64
5	16
2	58
2	72
3	64
15	31
1	58
5	31
7	56
9	31
19	0
14	12
21	0
7	48
4	42
10	28
2	58
1	58
2	48
12	19
8	35
11	12
3	35
1	42
8	3
12	0
10	12
2	39
15	2
17	2
8	31
7	24
5	24
2	35
5	15
8	31
12	2
3	42
0	42
5	12
10	2
1	31
10	12
3	31
4	31
6	2
2	16
3	16
3	28
3	31
7	0
2	31
8	0
2	6
3	28
3	28
4	16
1	12
5	15
3	16
1	12
1	24
1	16
2	28
8	6
2	16
5	12
6	2
3	4
6	12
3	16
5	2
4	0
0	0
3	11
2	2
6	0
1	16
3	0

Margin (mm)	Years the old record stood
31	64
27	86
27	58
17	64
14	112
9	96
17	87
18	23
31	28
18	22
33	16
11	112
9	115
22	64
8	111
36	28
25	31
8	110
23	35
17	39
8	86
1	120
1	100
7	72
17	31
12	62
6	86
2	88
16	42
5	78
11	31
2	86
10	58
15	28
24	12
23	4
3	64
21	12
2	72
8	39
3	64
7	58
12	16
21	31
9	58
3	58
3	64
5	16
2	58
2	72
3	64
15	31
1	58
5	31
7	56
9	31
19	0
14	12
21	0
7	48
4	42
10	28
2	58
1	58
2	48
12	19
8	35
11	12
3	35
1	42
8	3
12	0
10	12
2	39
15	2
17	2
8	31
7	24
5	24
2	35
5	15
8	31
12	2
3	42
0	42
5	12
10	2
1	31
10	12
3	31
4	31
6	2
2	16
3	16
3	28
3	31
7	0
2	31
8	0
2	6
3	28
3	28
4	16
1	12
5	15
3	16
1	12
1	24
1	16
2	28
8	6
2	16
5	12
6	2
3	4
6	12
3	16
5	2
4	0
0	0
3	11
2	2
6	0
1	16
3	0

Margin (mm)	Years the old record stood
31	64
27	86
27	58
17	64
14	112
9	96
17	87
18	23
31	28
18	22
33	16
11	112
9	115
22	64
8	111
36	28
25	31
8	110
23	35
17	39
8	86
1	120
1	100
7	72
17	31
12	62
6	86
2	88
16	42
5	78
11	31
2	86
10	58
15	28
24	12
23	4
3	64
21	12
2	72
8	39
3	64
7	58
12	16
21	31
9	58
3	58
3	64
5	16
2	58
2	72
3	64
15	31
1	58
5	31
7	56
9	31
19	0
14	12
21	0
7	48
4	42
10	28
2	58
1	58
2	48
12	19
8	35
11	12
3	35
1	42
8	3
12	0
10	12
2	39
15	2
17	2
8	31
7	24
5	24
2	35
5	15
8	31
12	2
3	42
0	42
5	12
10	2
1	31
10	12
3	31
4	31
6	2
2	16
3	16
3	28
3	31
7	0
2	31
8	0
2	6
3	28
3	28
4	16
1	12
5	15
3	16
1	12
1	24
1	16
2	28
8	6
2	16
5	12
6	2
3	4
6	12
3	16
5	2
4	0
0	0
3	11
2	2
6	0
1	16
3	0