Extreme rain in United States, 22 to 27 September 2020

Name: Extreme rain in United States, 22 to 27 September 2020
Start: 2020-09-22
End: 2020-09-27
Location: United States

Extreme rain in United States, 22 to 27 September 2020: 173 records at 133 stations, peak on 25 September 2020. Closed.

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

Key Facts

Extreme rain in United States, 22 to 27 September 2020 set or tied 173 station records at 133 stations.
It ran from 22 September 2020 to 27 September 2020 (6 days) and its peak day was 25 September 2020.
Status: closed.
Cascade Locks set a daily record precipitation of 53.8 mm (2.1 in) on 26 September 2020.
The busiest day was 25 September 2020 with 66 records.
The oldest broken record in the ranked list had stood for 119 years.

Footprint

22 to 27 September 2020

The area covered by Extreme rain in United States, 22 to 27 September 2020 is outlined, with 19 of the stations that set records marked, coloured by record type. Made with Natural Earth.

Footprint of Extreme rain in United States, 22 to 27 September 2020: stations that set records in the event
Station	Type	Value	Date
Cascade Locks	Record daily precipitation	53.8 mm (2.1 in)	2020-09-26
Lyman Lake	Record daily precipitation	50.8 mm (2.0 in)	2020-09-23
Grouse Camp	Record daily precipitation	30.5 mm (1.2 in)	2020-09-23
Thunder Basin	Record daily precipitation	73.7 mm (2.9 in)	2020-09-23
Cougar Mountain	Record daily precipitation	86.4 mm (3.4 in)	2020-09-23
Concrete Ppl Fish STN	Record daily precipitation	54.6 mm (2.1 in)	2020-09-24
Bear Mountain	Record daily precipitation	63.5 mm (2.5 in)	2020-09-25
Forks 1 E	Record daily precipitation	70.4 mm (2.8 in)	2020-09-23
Trough	Record daily precipitation	40.6 mm (1.6 in)	2020-09-23
Clatskanie	Record daily precipitation	40.6 mm (1.6 in)	2020-09-24
Nehalem 9 NE	Record daily precipitation	109.0 mm (4.3 in)	2020-09-24
Silver Creek Falls	Record daily precipitation	48.8 mm (1.9 in)	2020-09-25
Baring	Record daily precipitation	83.8 mm (3.3 in)	2020-09-24
Cathlamet 3NE	Record daily precipitation	38.1 mm (1.5 in)	2020-09-22
Quilcene 2 SW	Record daily precipitation	21.3 mm (0.8 in)	2020-09-23
Ellensburg Bowers Fld	Record daily precipitation	11.4 mm (0.4 in)	2020-09-23
Ellensburg	Record daily precipitation	8.6 mm (0.34 in)	2020-09-24
Olympia AP	Record daily precipitation	22.4 mm (0.9 in)	2020-09-25
Falls City 2 SSW	Record daily precipitation	22.9 mm (0.9 in)	2020-09-26

Records per Day

Peak day 66

Records set or tied each day from 22 September 2020 to 27 September 2020. The most in one day was 66 on 25 September 2020.

Top Records by Margin

Margin over the record replaced

Top records of Extreme rain in United States, 22 to 27 September 2020 ranked by margin
Cougar Mountain, 09-23	53.4 mm (2.1 in)
Thunder Basin, 09-23	48.3 mm (1.9 in)
Nehalem 9 NE, 09-24	47.3 mm (1.9 in)
Baring, 09-26	40.9 mm (1.6 in)
Bear Mountain, 09-25	40.6 mm (1.6 in)
Baring, 09-24	39.1 mm (1.5 in)
Lyman Lake, 09-23	35.6 mm (1.4 in)
Trough, 09-23	33.0 mm (1.3 in)
Forks 1 E, 09-23	29.8 mm (1.2 in)
Grouse Camp, 09-23	28.0 mm (1.1 in)
Silver Creek Falls, 09-25	26.7 mm (1.1 in)
Cathlamet 3NE, 09-22	25.9 mm (1.0 in)
Clatskanie, 09-24	19.0 mm (0.7 in)
Concrete Ppl Fish STN, 09-24	18.5 mm (0.7 in)
Cascade Locks, 09-26	16.7 mm (0.7 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

173 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, 22 to 27 September 2020
Margin (mm)	Years the old record stood
17	115
36	28
28	28
48	28
53	28
9	72
19	61
3	119
41	38
6	119
30	51
33	7
11	70
19	34
47	28
27	34
39	28
41	23
13	47
26	36
25	34
12	34
1	87
6	70
7	70
2	82
33	34
4	57
15	28
30	34
5	70
10	43
29	28
19	34
15	32
13	32
15	28
9	47
4	64
3	70
14	10
0	70
13	34
21	6
10	34
13	34
18	28
23	28
28	28
2	61
3	61
3	72
10	6
8	34
13	34
10	34
23	34
10	32
5	38
25	28
3	61
5	38
3	38
8	49
17	28
18	34
2	61
3	43
28	28
15	6
10	22
8	34
15	32
10	28
5	34
13	39
4	38
10	32
8	32
8	39
18	34
10	34
8	6
25	1
8	32
13	28
9	7
2	28
9	23
2	38
2	47
5	38
8	34
10	28
13	34
5	39
2	42
9	6
1	54
1	36
5	38
8	22
8	32
6	34
8	34
8	34
13	34
8	34
9	28
5	28
5	28
3	34
3	38
5	32
8	28
5	32
15	9
4	34
3	28
5	28
8	22
3	38
3	34
3	38
8	22
0	34
8	6
11	6
12	9
5	32
8	32
5	28
8	32
15	28
3	32
8	23
5	22
5	32
5	34
0	32
3	32
3	28
5	21
3	32
5	23
10	6
3	34
3	32
9	10
6	7
5	7
3	28
8	21
5	28
6	6
3	23
15	6
8	19
3	23
3	22
10	6
6	1
1	6
7	6
3	7
8	6
5	6
6	1
3	7
3	6
2	6
1	6
1	1

Compared With Other Events

Station records per event

Station records in Extreme rain in United States, 22 to 27 September 2020 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, 22 to 27 September 2020 (this event)	173 records

Every Record Set

20 of 173

Every record set or tied during Extreme rain in United States, 22 to 27 September 2020, in date order
Date	Station	Record	Value	Margin	Years stood	Significance
2020-09-22	Cathlamet 3NE	Record daily precipitation	38.1 mm (1.5 in)	25.9 mm (1.0 in)	36	40 of 100 (Notable)
2020-09-23	Lyman Lake	Record daily precipitation	50.8 mm (2.0 in)	35.6 mm (1.4 in)	28	52 of 100 (Notable)
2020-09-23	Grouse Camp	Record daily precipitation	30.5 mm (1.2 in)	28.0 mm (1.1 in)	28	51 of 100 (Notable)
2020-09-23	Thunder Basin	Record daily precipitation	73.7 mm (2.9 in)	48.3 mm (1.9 in)	28	50 of 100 (Notable)
2020-09-23	Cougar Mountain	Record daily precipitation	86.4 mm (3.4 in)	53.4 mm (2.1 in)	28	49 of 100 (Notable)
2020-09-23	Forks 1 E	Record daily precipitation	70.4 mm (2.8 in)	29.8 mm (1.2 in)	51	45 of 100 (Notable)
2020-09-23	Trough	Record daily precipitation	40.6 mm (1.6 in)	33.0 mm (1.3 in)	7	43 of 100 (Notable)
2020-09-23	Quilcene 2 SW	Record daily precipitation	21.3 mm (0.8 in)	13.4 mm (0.5 in)	47	20 of 100 (Routine)
2020-09-23	Ellensburg Bowers Fld	Record daily precipitation	11.4 mm (0.4 in)	8.9 mm (0.35 in)	72	20 of 100 (Routine)
2020-09-24	Concrete Ppl Fish STN	Record daily precipitation	54.6 mm (2.1 in)	18.5 mm (0.7 in)	61	47 of 100 (Notable)
2020-09-24	Clatskanie	Record daily precipitation	40.6 mm (1.6 in)	19.0 mm (0.7 in)	34	42 of 100 (Notable)
2020-09-24	Nehalem 9 NE	Record daily precipitation	109.0 mm (4.3 in)	47.3 mm (1.9 in)	28	42 of 100 (Notable)
2020-09-24	Baring	Record daily precipitation	83.8 mm (3.3 in)	39.1 mm (1.5 in)	28	41 of 100 (Notable)
2020-09-24	Ellensburg	Record daily precipitation	8.6 mm (0.34 in)	2.8 mm (0.11 in)	119	20 of 100 (Routine)
2020-09-25	Bear Mountain	Record daily precipitation	63.5 mm (2.5 in)	40.6 mm (1.6 in)	38	46 of 100 (Notable)
2020-09-25	Silver Creek Falls	Record daily precipitation	48.8 mm (1.9 in)	26.7 mm (1.1 in)	34	42 of 100 (Notable)
2020-09-25	Olympia AP	Record daily precipitation	22.4 mm (0.9 in)	11.2 mm (0.4 in)	70	20 of 100 (Routine)
2020-09-26	Cascade Locks	Record daily precipitation	53.8 mm (2.1 in)	16.7 mm (0.7 in)	115	55 of 100 (Notable)
2020-09-26	Baring	Record daily precipitation	72.4 mm (2.9 in)	40.9 mm (1.6 in)	23	41 of 100 (Notable)
2020-09-26	Falls City 2 SSW	Record daily precipitation	22.9 mm (0.9 in)	6.1 mm (0.24 in)	119	20 of 100 (Routine)

The daily ledgers keep a limited number of records per day, so this list has 20 of the 173 records the event counts. The counts above use the full total.

Related Headlines

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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
17	115
36	28
28	28
48	28
53	28
9	72
19	61
3	119
41	38
6	119
30	51
33	7
11	70
19	34
47	28
27	34
39	28
41	23
13	47
26	36
25	34
12	34
1	87
6	70
7	70
2	82
33	34
4	57
15	28
30	34
5	70
10	43
29	28
19	34
15	32
13	32
15	28
9	47
4	64
3	70
14	10
0	70
13	34
21	6
10	34
13	34
18	28
23	28
28	28
2	61
3	61
3	72
10	6
8	34
13	34
10	34
23	34
10	32
5	38
25	28
3	61
5	38
3	38
8	49
17	28
18	34
2	61
3	43
28	28
15	6
10	22
8	34
15	32
10	28
5	34
13	39
4	38
10	32
8	32
8	39
18	34
10	34
8	6
25	1
8	32
13	28
9	7
2	28
9	23
2	38
2	47
5	38
8	34
10	28
13	34
5	39
2	42
9	6
1	54
1	36
5	38
8	22
8	32
6	34
8	34
8	34
13	34
8	34
9	28
5	28
5	28
3	34
3	38
5	32
8	28
5	32
15	9
4	34
3	28
5	28
8	22
3	38
3	34
3	38
8	22
0	34
8	6
11	6
12	9
5	32
8	32
5	28
8	32
15	28
3	32
8	23
5	22
5	32
5	34
0	32
3	32
3	28
5	21
3	32
5	23
10	6
3	34
3	32
9	10
6	7
5	7
3	28
8	21
5	28
6	6
3	23
15	6
8	19
3	23
3	22
10	6
6	1
1	6
7	6
3	7
8	6
5	6
6	1
3	7
3	6
2	6
1	6
1	1

Margin (mm)	Years the old record stood
17	115
36	28
28	28
48	28
53	28
9	72
19	61
3	119
41	38
6	119
30	51
33	7
11	70
19	34
47	28
27	34
39	28
41	23
13	47
26	36
25	34
12	34
1	87
6	70
7	70
2	82
33	34
4	57
15	28
30	34
5	70
10	43
29	28
19	34
15	32
13	32
15	28
9	47
4	64
3	70
14	10
0	70
13	34
21	6
10	34
13	34
18	28
23	28
28	28
2	61
3	61
3	72
10	6
8	34
13	34
10	34
23	34
10	32
5	38
25	28
3	61
5	38
3	38
8	49
17	28
18	34
2	61
3	43
28	28
15	6
10	22
8	34
15	32
10	28
5	34
13	39
4	38
10	32
8	32
8	39
18	34
10	34
8	6
25	1
8	32
13	28
9	7
2	28
9	23
2	38
2	47
5	38
8	34
10	28
13	34
5	39
2	42
9	6
1	54
1	36
5	38
8	22
8	32
6	34
8	34
8	34
13	34
8	34
9	28
5	28
5	28
3	34
3	38
5	32
8	28
5	32
15	9
4	34
3	28
5	28
8	22
3	38
3	34
3	38
8	22
0	34
8	6
11	6
12	9
5	32
8	32
5	28
8	32
15	28
3	32
8	23
5	22
5	32
5	34
0	32
3	32
3	28
5	21
3	32
5	23
10	6
3	34
3	32
9	10
6	7
5	7
3	28
8	21
5	28
6	6
3	23
15	6
8	19
3	23
3	22
10	6
6	1
1	6
7	6
3	7
8	6
5	6
6	1
3	7
3	6
2	6
1	6
1	1

Margin (mm)	Years the old record stood
17	115
36	28
28	28
48	28
53	28
9	72
19	61
3	119
41	38
6	119
30	51
33	7
11	70
19	34
47	28
27	34
39	28
41	23
13	47
26	36
25	34
12	34
1	87
6	70
7	70
2	82
33	34
4	57
15	28
30	34
5	70
10	43
29	28
19	34
15	32
13	32
15	28
9	47
4	64
3	70
14	10
0	70
13	34
21	6
10	34
13	34
18	28
23	28
28	28
2	61
3	61
3	72
10	6
8	34
13	34
10	34
23	34
10	32
5	38
25	28
3	61
5	38
3	38
8	49
17	28
18	34
2	61
3	43
28	28
15	6
10	22
8	34
15	32
10	28
5	34
13	39
4	38
10	32
8	32
8	39
18	34
10	34
8	6
25	1
8	32
13	28
9	7
2	28
9	23
2	38
2	47
5	38
8	34
10	28
13	34
5	39
2	42
9	6
1	54
1	36
5	38
8	22
8	32
6	34
8	34
8	34
13	34
8	34
9	28
5	28
5	28
3	34
3	38
5	32
8	28
5	32
15	9
4	34
3	28
5	28
8	22
3	38
3	34
3	38
8	22
0	34
8	6
11	6
12	9
5	32
8	32
5	28
8	32
15	28
3	32
8	23
5	22
5	32
5	34
0	32
3	32
3	28
5	21
3	32
5	23
10	6
3	34
3	32
9	10
6	7
5	7
3	28
8	21
5	28
6	6
3	23
15	6
8	19
3	23
3	22
10	6
6	1
1	6
7	6
3	7
8	6
5	6
6	1
3	7
3	6
2	6
1	6
1	1