Extreme rain in United States, 16 to 27 December 2017

Name: Extreme rain in United States, 16 to 27 December 2017
Start: 2017-12-16
End: 2017-12-27
Location: United States

Extreme rain in United States, 16 to 27 December 2017: 312 records at 264 stations, peak on 19 December 2017. Closed.

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

Key Facts

Extreme rain in United States, 16 to 27 December 2017 set or tied 312 station records at 264 stations.
It ran from 16 December 2017 to 27 December 2017 (12 days) and its peak day was 19 December 2017.
Status: closed.
Riggins set a monthly record daily precipitation of 50.8 mm (2.0 in) on 21 December 2017.
The busiest day was 19 December 2017 with 91 records.
The oldest broken record in the ranked list had stood for 121 years.

Footprint

16 to 27 December 2017

The area covered by Extreme rain in United States, 16 to 27 December 2017 is outlined, with 18 of the stations that set records marked, coloured by record type. Made with Natural Earth.

Footprint of Extreme rain in United States, 16 to 27 December 2017: stations that set records in the event
Station	Type	Value	Date
Riggins	Record daily precipitation	50.8 mm (2.0 in)	2017-12-21
Libby 32 SSE	Record daily precipitation	47.0 mm (1.9 in)	2017-12-18
Bellingham Intl AP	Record daily precipitation	56.4 mm (2.2 in)	2017-12-19
Hungry Horse Dam	Record daily precipitation	41.4 mm (1.6 in)	2017-12-20
Potlatch 3 NNE	Record daily precipitation	30.7 mm (1.2 in)	2017-12-19
Clearbrook	Record daily precipitation	62.5 mm (2.5 in)	2017-12-19
Brady 27 ENE (the Knees)	Record daily precipitation	30.7 mm (1.2 in)	2017-12-20
University Camp	Record daily precipitation	33.0 mm (1.3 in)	2017-12-25
Spokane Intl AP	Record daily precipitation	28.4 mm (1.1 in)	2017-12-19
Brooklyn Lake	Record daily precipitation	35.6 mm (1.4 in)	2017-12-25
Worland	Record daily precipitation	9.1 mm (0.36 in)	2017-12-17
Choteau	Record daily precipitation	8.9 mm (0.35 in)	2017-12-19
Gibson Dam	Record daily precipitation	14.0 mm (0.6 in)	2017-12-19
Kalispell Glacier AP	Record daily precipitation	21.6 mm (0.9 in)	2017-12-19
Skq Dam	Record daily precipitation	18.3 mm (0.7 in)	2017-12-19
Coupeville 1 S	Record daily precipitation	23.4 mm (0.9 in)	2017-12-19
Creston	Record daily precipitation	20.8 mm (0.8 in)	2017-12-20
Moab	Record daily precipitation	24.1 mm (0.9 in)	2017-12-21

Records per Day

Peak day 91

Records set or tied each day from 16 December 2017 to 27 December 2017. The most in one day was 91 on 19 December 2017.

Records per day during Extreme rain in United States, 16 to 27 December 2017
Date	Records
2017-12-16	15
2017-12-17	10
2017-12-18	34
2017-12-19	91
2017-12-20	48
2017-12-21	18
2017-12-22	15
2017-12-23	47
2017-12-24	8
2017-12-25	23
2017-12-26	2
2017-12-27	1

Top Records by Margin

Margin over the record replaced

Top records of Extreme rain in United States, 16 to 27 December 2017 ranked by margin
Libby 32 SSE, 12-18	29.7 mm (1.2 in)
Bellingham Intl AP, 12-19	29.2 mm (1.1 in)
University Camp, 12-25	25.4 mm (1.0 in)
Hungry Horse Dam, 12-20	24.9 mm (1.0 in)
Clearbrook, 12-19	21.9 mm (0.9 in)
Brooklyn Lake, 12-25	20.4 mm (0.8 in)
Brooklyn Lake, 12-23	20.3 mm (0.8 in)
Riggins, 12-23	19.8 mm (0.8 in)
Brady 27 ENE (the Knees), 12-20	16.2 mm (0.6 in)
Potlatch 3 NNE, 12-19	14.2 mm (0.6 in)
Creston, 12-20	14.2 mm (0.6 in)
Moab, 12-21	13.9 mm (0.5 in)
Skq Dam, 12-19	13.5 mm (0.5 in)
Riggins, 12-21	12.7 mm (0.5 in)
Kalispell Glacier AP, 12-19	10.7 mm (0.4 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

312 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, 16 to 27 December 2017
Margin (mm)	Years the old record stood
13	112
30	66
14	64
25	64
29	64
20	42
14	56
14	100
5	108
7	100
11	56
6	62
14	58
16	10
22	84
25	34
20	36
6	121
10	68
20	30
11	52
18	30
7	24
10	20
15	28
7	52
4	116
19	27
20	20
7	48
25	10
2	92
5	86
15	34
7	36
5	83
13	36
25	10
1	92
13	60
3	78
5	35
23	18
4	66
2	91
1	106
0	102
13	28
7	47
6	54
1	96
24	3
5	50
15	34
6	54
15	34
28	20
7	62
2	66
1	83
10	34
10	62
8	14
13	46
13	27
7	62
10	19
3	50
8	30
15	28
13	28
4	42
4	50
10	19
20	20
20	3
6	64
4	24
3	62
2	76
7	56
2	64
2	56
2	64
9	27
4	39
2	54
7	48
2	24
1	76
19	35
10	36
2	64
14	66
5	56
1	64
4	76
1	66
1	66
4	56
3	42
13	27
20	24
2	52
3	48
3	23
2	52
4	28
10	35
5	36
1	72
3	0
4	18
1	64
6	44
4	28
2	52
15	36
2	64
2	52
6	7
6	24
6	24
1	52
13	10
10	38
3	56
3	7
3	35
1	46
8	35
27	38
5	0
10	30
5	28
10	34
8	15
7	16
1	56
4	51
4	7
1	47
5	30
3	34
1	36
1	56
0	56
2	30
5	28
8	36
3	35
4	32
14	36
4	28
5	23
5	34
10	26
4	0
2	38
1	34
0	48
6	27
1	52
3	16
4	28
4	27
1	35
3	27
4	28
0	42
8	26
5	28
5	34
8	36
23	24
4	14
2	32
2	7
2	22
2	34
13	4
10	27
8	36
4	36
2	26
2	28
1	34
4	35
2	10
5	36
3	34
3	34
5	12
1	36
3	16
4	44
2	7
3	16
5	8
8	36

Compared With Other Events

Station records per event

Station records in Extreme rain in United States, 16 to 27 December 2017 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, 16 to 27 December 2017 (this event)	312 records

Every Record Set

20 of 312

Every record set or tied during Extreme rain in United States, 16 to 27 December 2017, in date order
Date	Station	Record	Value	Margin	Years stood	Significance
2017-12-17	Worland	Record daily precipitation	9.1 mm (0.36 in)	6.3 mm (0.25 in)	62	20 of 100 (Routine)
2017-12-18	Libby 32 SSE	Record daily precipitation	47.0 mm (1.9 in)	29.7 mm (1.2 in)	66	69 of 100 (Major)
2017-12-19	Bellingham Intl AP	Record daily precipitation	56.4 mm (2.2 in)	29.2 mm (1.1 in)	64	65 of 100 (Major)
2017-12-19	Potlatch 3 NNE	Record daily precipitation	30.7 mm (1.2 in)	14.2 mm (0.6 in)	100	61 of 100 (Major)
2017-12-19	Clearbrook	Record daily precipitation	62.5 mm (2.5 in)	21.9 mm (0.9 in)	84	56 of 100 (Notable)
2017-12-19	Spokane Intl AP	Record daily precipitation	28.4 mm (1.1 in)	6.0 mm (0.24 in)	121	53 of 100 (Notable)
2017-12-19	Choteau	Record daily precipitation	8.9 mm (0.35 in)	5.1 mm (0.20 in)	108	20 of 100 (Routine)
2017-12-19	Gibson Dam	Record daily precipitation	14.0 mm (0.6 in)	7.4 mm (0.29 in)	100	20 of 100 (Routine)
2017-12-19	Kalispell Glacier AP	Record daily precipitation	21.6 mm (0.9 in)	10.7 mm (0.4 in)	56	20 of 100 (Routine)
2017-12-19	Skq Dam	Record daily precipitation	18.3 mm (0.7 in)	13.5 mm (0.5 in)	56	20 of 100 (Routine)
2017-12-19	Coupeville 1 S	Record daily precipitation	23.4 mm (0.9 in)	10.2 mm (0.4 in)	68	20 of 100 (Routine)
2017-12-20	Hungry Horse Dam	Record daily precipitation	41.4 mm (1.6 in)	24.9 mm (1.0 in)	64	65 of 100 (Major)
2017-12-20	Brady 27 ENE (the Knees)	Record daily precipitation	30.7 mm (1.2 in)	16.2 mm (0.6 in)	10	56 of 100 (Notable)
2017-12-20	Creston	Record daily precipitation	20.8 mm (0.8 in)	14.2 mm (0.6 in)	64	20 of 100 (Routine)
2017-12-21	Riggins	Record daily precipitation	50.8 mm (2.0 in)	12.7 mm (0.5 in)	112	78 of 100 (Major)
2017-12-21	Moab	Record daily precipitation	24.1 mm (0.9 in)	13.9 mm (0.5 in)	58	20 of 100 (Routine)
2017-12-23	Riggins	Record daily precipitation	33.0 mm (1.3 in)	19.8 mm (0.8 in)	42	62 of 100 (Major)
2017-12-23	Brooklyn Lake	Record daily precipitation	33.0 mm (1.3 in)	20.3 mm (0.8 in)	30	52 of 100 (Notable)
2017-12-25	University Camp	Record daily precipitation	33.0 mm (1.3 in)	25.4 mm (1.0 in)	34	54 of 100 (Notable)
2017-12-25	Brooklyn Lake	Record daily precipitation	35.6 mm (1.4 in)	20.4 mm (0.8 in)	36	53 of 100 (Notable)

The daily ledgers keep a limited number of records per day, so this list has 20 of the 312 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
13	112
30	66
14	64
25	64
29	64
20	42
14	56
14	100
5	108
7	100
11	56
6	62
14	58
16	10
22	84
25	34
20	36
6	121
10	68
20	30
11	52
18	30
7	24
10	20
15	28
7	52
4	116
19	27
20	20
7	48
25	10
2	92
5	86
15	34
7	36
5	83
13	36
25	10
1	92
13	60
3	78
5	35
23	18
4	66
2	91
1	106
0	102
13	28
7	47
6	54
1	96
24	3
5	50
15	34
6	54
15	34
28	20
7	62
2	66
1	83
10	34
10	62
8	14
13	46
13	27
7	62
10	19
3	50
8	30
15	28
13	28
4	42
4	50
10	19
20	20
20	3
6	64
4	24
3	62
2	76
7	56
2	64
2	56
2	64
9	27
4	39
2	54
7	48
2	24
1	76
19	35
10	36
2	64
14	66
5	56
1	64
4	76
1	66
1	66
4	56
3	42
13	27
20	24
2	52
3	48
3	23
2	52
4	28
10	35
5	36
1	72
3	0
4	18
1	64
6	44
4	28
2	52
15	36
2	64
2	52
6	7
6	24
6	24
1	52
13	10
10	38
3	56
3	7
3	35
1	46
8	35
27	38
5	0
10	30
5	28
10	34
8	15
7	16
1	56
4	51
4	7
1	47
5	30
3	34
1	36
1	56
0	56
2	30
5	28
8	36
3	35
4	32
14	36
4	28
5	23
5	34
10	26
4	0
2	38
1	34
0	48
6	27
1	52
3	16
4	28
4	27
1	35
3	27
4	28
0	42
8	26
5	28
5	34
8	36
23	24
4	14
2	32
2	7
2	22
2	34
13	4
10	27
8	36
4	36
2	26
2	28
1	34
4	35
2	10
5	36
3	34
3	34
5	12
1	36
3	16
4	44
2	7
3	16
5	8
8	36

Margin (mm)	Years the old record stood
13	112
30	66
14	64
25	64
29	64
20	42
14	56
14	100
5	108
7	100
11	56
6	62
14	58
16	10
22	84
25	34
20	36
6	121
10	68
20	30
11	52
18	30
7	24
10	20
15	28
7	52
4	116
19	27
20	20
7	48
25	10
2	92
5	86
15	34
7	36
5	83
13	36
25	10
1	92
13	60
3	78
5	35
23	18
4	66
2	91
1	106
0	102
13	28
7	47
6	54
1	96
24	3
5	50
15	34
6	54
15	34
28	20
7	62
2	66
1	83
10	34
10	62
8	14
13	46
13	27
7	62
10	19
3	50
8	30
15	28
13	28
4	42
4	50
10	19
20	20
20	3
6	64
4	24
3	62
2	76
7	56
2	64
2	56
2	64
9	27
4	39
2	54
7	48
2	24
1	76
19	35
10	36
2	64
14	66
5	56
1	64
4	76
1	66
1	66
4	56
3	42
13	27
20	24
2	52
3	48
3	23
2	52
4	28
10	35
5	36
1	72
3	0
4	18
1	64
6	44
4	28
2	52
15	36
2	64
2	52
6	7
6	24
6	24
1	52
13	10
10	38
3	56
3	7
3	35
1	46
8	35
27	38
5	0
10	30
5	28
10	34
8	15
7	16
1	56
4	51
4	7
1	47
5	30
3	34
1	36
1	56
0	56
2	30
5	28
8	36
3	35
4	32
14	36
4	28
5	23
5	34
10	26
4	0
2	38
1	34
0	48
6	27
1	52
3	16
4	28
4	27
1	35
3	27
4	28
0	42
8	26
5	28
5	34
8	36
23	24
4	14
2	32
2	7
2	22
2	34
13	4
10	27
8	36
4	36
2	26
2	28
1	34
4	35
2	10
5	36
3	34
3	34
5	12
1	36
3	16
4	44
2	7
3	16
5	8
8	36

Margin (mm)	Years the old record stood
13	112
30	66
14	64
25	64
29	64
20	42
14	56
14	100
5	108
7	100
11	56
6	62
14	58
16	10
22	84
25	34
20	36
6	121
10	68
20	30
11	52
18	30
7	24
10	20
15	28
7	52
4	116
19	27
20	20
7	48
25	10
2	92
5	86
15	34
7	36
5	83
13	36
25	10
1	92
13	60
3	78
5	35
23	18
4	66
2	91
1	106
0	102
13	28
7	47
6	54
1	96
24	3
5	50
15	34
6	54
15	34
28	20
7	62
2	66
1	83
10	34
10	62
8	14
13	46
13	27
7	62
10	19
3	50
8	30
15	28
13	28
4	42
4	50
10	19
20	20
20	3
6	64
4	24
3	62
2	76
7	56
2	64
2	56
2	64
9	27
4	39
2	54
7	48
2	24
1	76
19	35
10	36
2	64
14	66
5	56
1	64
4	76
1	66
1	66
4	56
3	42
13	27
20	24
2	52
3	48
3	23
2	52
4	28
10	35
5	36
1	72
3	0
4	18
1	64
6	44
4	28
2	52
15	36
2	64
2	52
6	7
6	24
6	24
1	52
13	10
10	38
3	56
3	7
3	35
1	46
8	35
27	38
5	0
10	30
5	28
10	34
8	15
7	16
1	56
4	51
4	7
1	47
5	30
3	34
1	36
1	56
0	56
2	30
5	28
8	36
3	35
4	32
14	36
4	28
5	23
5	34
10	26
4	0
2	38
1	34
0	48
6	27
1	52
3	16
4	28
4	27
1	35
3	27
4	28
0	42
8	26
5	28
5	34
8	36
23	24
4	14
2	32
2	7
2	22
2	34
13	4
10	27
8	36
4	36
2	26
2	28
1	34
4	35
2	10
5	36
3	34
3	34
5	12
1	36
3	16
4	44
2	7
3	16
5	8
8	36