Extreme rain in United States, 27 December 2017 to 2 January 2018

Name: Extreme rain in United States, 27 December 2017 to 2 January 2018
Start: 2017-12-27
End: 2018-01-02
Location: United States

Extreme rain in United States, 27 December 2017 to 2 January 2018: 155 records at 143 stations, peak on 29 December 2017. Closed.

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

Key Facts

Extreme rain in United States, 27 December 2017 to 2 January 2018 set or tied 155 station records at 143 stations.
It ran from 27 December 2017 to 2 January 2018 (7 days) and its peak day was 29 December 2017.
Status: closed.
Pomeroy set a monthly record daily precipitation of 58.4 mm (2.3 in) on 29 December 2017.
The busiest day was 29 December 2017 with 77 records.
The oldest broken record in the ranked list had stood for 112 years.

Footprint

27 December 2017 to 2 January 2018

The area covered by Extreme rain in United States, 27 December 2017 to 2 January 2018 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, 27 December 2017 to 2 January 2018: stations that set records in the event
Station	Type	Value	Date
Pomeroy	Record daily precipitation	58.4 mm (2.3 in)	2017-12-29
Moscow U of I	Record daily precipitation	48.8 mm (1.9 in)	2017-12-29
Elliston	Record daily precipitation	32.0 mm (1.3 in)	2017-12-30
Rogers Pass 9 NNE	Record daily precipitation	58.7 mm (2.3 in)	2017-12-31
Lewiston AP	Record daily precipitation	33.8 mm (1.3 in)	2017-12-29
N Fk Elk Creek	Record daily precipitation	38.1 mm (1.5 in)	2017-12-29
Mill Creek Dam	Record daily precipitation	33.5 mm (1.3 in)	2017-12-29
Pullman 2 NW	Record daily precipitation	34.5 mm (1.4 in)	2017-12-29
Rosalia	Record daily precipitation	29.7 mm (1.2 in)	2017-12-29
Beartooth Lake	Record daily precipitation	53.3 mm (2.1 in)	2017-12-29
Coeur D'Alene	Record daily precipitation	43.2 mm (1.7 in)	2017-12-30
Seaside	Record daily precipitation	100.3 mm (3.9 in)	2017-12-29
Snoqualmie Falls	Record daily precipitation	57.4 mm (2.3 in)	2017-12-29
Warm Springs	Record daily precipitation	35.6 mm (1.4 in)	2017-12-29
Philipsburg Rs	Record daily precipitation	13.2 mm (0.5 in)	2017-12-27
Billings Wtp	Record daily precipitation	14.0 mm (0.6 in)	2017-12-28
Big Sandy	Record daily precipitation	10.2 mm (0.4 in)	2017-12-29
Custer	Record daily precipitation	7.4 mm (0.29 in)	2017-12-29
Billings Intl AP	Record daily precipitation	18.3 mm (0.7 in)	2017-12-29
Boulder	Record daily precipitation	9.4 mm (0.37 in)	2017-12-30

Records per Day

Peak day 77

Records set or tied each day from 27 December 2017 to 2 January 2018. The most in one day was 77 on 29 December 2017.

Top Records by Margin

Margin over the record replaced

Top records of Extreme rain in United States, 27 December 2017 to 2 January 2018 ranked by margin
Seaside, 12-29	45.7 mm (1.8 in)
Beartooth Lake, 12-29	30.4 mm (1.2 in)
Moscow U of I, 12-29	29.0 mm (1.1 in)
Mill Creek Dam, 12-29	20.8 mm (0.8 in)
Rogers Pass 9 NNE, 12-31	20.6 mm (0.8 in)
Pomeroy, 12-29	20.0 mm (0.8 in)
Warm Springs, 12-29	17.8 mm (0.7 in)
Coeur D'Alene, 12-30	16.8 mm (0.7 in)
N Fk Elk Creek, 12-29	15.2 mm (0.6 in)
Pullman 2 NW, 12-29	15.2 mm (0.6 in)
Elliston, 12-30	14.2 mm (0.6 in)
Lewiston AP, 12-29	11.7 mm (0.5 in)
Philipsburg Rs, 12-27	10.7 mm (0.4 in)
Billings Intl AP, 12-29	10.7 mm (0.4 in)
Big Sandy, 12-29	6.4 mm (0.25 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

155 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, 27 December 2017 to 2 January 2018
Margin (mm)	Years the old record stood
20	80
29	84
14	42
21	49
12	42
11	62
15	39
6	92
21	20
11	44
15	66
5	88
5	112
30	20
17	47
2	106
4	47
46	31
6	104
18	30
38	32
3	35
5	51
1	112
6	40
10	30
17	6
8	9
13	55
1	86
21	20
37	20
7	40
35	19
28	20
18	20
11	7
5	66
7	8
4	40
13	19
11	20
4	12
1	1
15	55
6	12
11	32
6	12
5	12
3	20
4	50
6	56
8	35
18	32
5	7
1	35
8	19
5	12
1	40
5	7
4	47
10	32
1	55
6	8
3	12
3	40
4	16
2	48
10	19
0	50
3	40
5	19
3	16
9	20
5	20
15	34
3	20
5	27
10	32
2	40
1	32
8	32
8	7
3	19
3	7
4	14
1	40
5	20
5	20
3	30
2	34
0	44
2	7
1	32
0	40
5	14
1	44
2	34
5	19
8	32
3	20
3	32
2	19
3	7
4	7
3	12
2	12
1	35
1	20
7	6
5	19
3	2
2	15
3	24
2	20
2	19
5	19
3	34
1	7
9	20
3	14
3	20
5	20
13	20
17	6
3	28
3	20
0	20
2	15
3	28
5	20
3	20
3	20
2	7
1	11
1	11
3	8
3	19
0	12
19	6
1	8
0	11
1	16
1	19
3	20
3	12
3	20
0	20
2	8
3	6
1	12
1	3
8	6
1	6
3	6

Compared With Other Events

Station records per event

Station records in Extreme rain in United States, 27 December 2017 to 2 January 2018 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, 27 December 2017 to 2 January 2018 (this event)	155 records

Every Record Set

20 of 155

Every record set or tied during Extreme rain in United States, 27 December 2017 to 2 January 2018, in date order
Date	Station	Record	Value	Margin	Years stood	Significance
2017-12-27	Philipsburg Rs	Record daily precipitation	13.2 mm (0.5 in)	10.7 mm (0.4 in)	62	20 of 100 (Routine)
2017-12-28	Billings Wtp	Record daily precipitation	14.0 mm (0.6 in)	4.9 mm (0.19 in)	88	20 of 100 (Routine)
2017-12-29	Pomeroy	Record daily precipitation	58.4 mm (2.3 in)	20.0 mm (0.8 in)	80	84 of 100 (Exceptional)
2017-12-29	Moscow U of I	Record daily precipitation	48.8 mm (1.9 in)	29.0 mm (1.1 in)	84	75 of 100 (Major)
2017-12-29	Lewiston AP	Record daily precipitation	33.8 mm (1.3 in)	11.7 mm (0.5 in)	42	67 of 100 (Major)
2017-12-29	N Fk Elk Creek	Record daily precipitation	38.1 mm (1.5 in)	15.2 mm (0.6 in)	39	63 of 100 (Major)
2017-12-29	Mill Creek Dam	Record daily precipitation	33.5 mm (1.3 in)	20.8 mm (0.8 in)	20	53 of 100 (Notable)
2017-12-29	Pullman 2 NW	Record daily precipitation	34.5 mm (1.4 in)	15.2 mm (0.6 in)	66	52 of 100 (Notable)
2017-12-29	Rosalia	Record daily precipitation	29.7 mm (1.2 in)	5.3 mm (0.21 in)	112	51 of 100 (Notable)
2017-12-29	Beartooth Lake	Record daily precipitation	53.3 mm (2.1 in)	30.4 mm (1.2 in)	20	49 of 100 (Notable)
2017-12-29	Seaside	Record daily precipitation	100.3 mm (3.9 in)	45.7 mm (1.8 in)	31	44 of 100 (Notable)
2017-12-29	Snoqualmie Falls	Record daily precipitation	57.4 mm (2.3 in)	5.6 mm (0.22 in)	104	44 of 100 (Notable)
2017-12-29	Warm Springs	Record daily precipitation	35.6 mm (1.4 in)	17.8 mm (0.7 in)	30	44 of 100 (Notable)
2017-12-29	Big Sandy	Record daily precipitation	10.2 mm (0.4 in)	6.4 mm (0.25 in)	92	20 of 100 (Routine)
2017-12-29	Custer	Record daily precipitation	7.4 mm (0.29 in)	2.3 mm (0.09 in)	106	20 of 100 (Routine)
2017-12-29	Billings Intl AP	Record daily precipitation	18.3 mm (0.7 in)	10.7 mm (0.4 in)	44	20 of 100 (Routine)
2017-12-30	Elliston	Record daily precipitation	32.0 mm (1.3 in)	14.2 mm (0.6 in)	42	72 of 100 (Major)
2017-12-30	Coeur D'Alene	Record daily precipitation	43.2 mm (1.7 in)	16.8 mm (0.7 in)	47	48 of 100 (Notable)
2017-12-30	Boulder	Record daily precipitation	9.4 mm (0.37 in)	4.3 mm (0.17 in)	47	20 of 100 (Routine)
2017-12-31	Rogers Pass 9 NNE	Record daily precipitation	58.7 mm (2.3 in)	20.6 mm (0.8 in)	49	69 of 100 (Major)

The daily ledgers keep a limited number of records per day, so this list has 20 of the 155 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
20	80
29	84
14	42
21	49
12	42
11	62
15	39
6	92
21	20
11	44
15	66
5	88
5	112
30	20
17	47
2	106
4	47
46	31
6	104
18	30
38	32
3	35
5	51
1	112
6	40
10	30
17	6
8	9
13	55
1	86
21	20
37	20
7	40
35	19
28	20
18	20
11	7
5	66
7	8
4	40
13	19
11	20
4	12
1	1
15	55
6	12
11	32
6	12
5	12
3	20
4	50
6	56
8	35
18	32
5	7
1	35
8	19
5	12
1	40
5	7
4	47
10	32
1	55
6	8
3	12
3	40
4	16
2	48
10	19
0	50
3	40
5	19
3	16
9	20
5	20
15	34
3	20
5	27
10	32
2	40
1	32
8	32
8	7
3	19
3	7
4	14
1	40
5	20
5	20
3	30
2	34
0	44
2	7
1	32
0	40
5	14
1	44
2	34
5	19
8	32
3	20
3	32
2	19
3	7
4	7
3	12
2	12
1	35
1	20
7	6
5	19
3	2
2	15
3	24
2	20
2	19
5	19
3	34
1	7
9	20
3	14
3	20
5	20
13	20
17	6
3	28
3	20
0	20
2	15
3	28
5	20
3	20
3	20
2	7
1	11
1	11
3	8
3	19
0	12
19	6
1	8
0	11
1	16
1	19
3	20
3	12
3	20
0	20
2	8
3	6
1	12
1	3
8	6
1	6
3	6

Margin (mm)	Years the old record stood
20	80
29	84
14	42
21	49
12	42
11	62
15	39
6	92
21	20
11	44
15	66
5	88
5	112
30	20
17	47
2	106
4	47
46	31
6	104
18	30
38	32
3	35
5	51
1	112
6	40
10	30
17	6
8	9
13	55
1	86
21	20
37	20
7	40
35	19
28	20
18	20
11	7
5	66
7	8
4	40
13	19
11	20
4	12
1	1
15	55
6	12
11	32
6	12
5	12
3	20
4	50
6	56
8	35
18	32
5	7
1	35
8	19
5	12
1	40
5	7
4	47
10	32
1	55
6	8
3	12
3	40
4	16
2	48
10	19
0	50
3	40
5	19
3	16
9	20
5	20
15	34
3	20
5	27
10	32
2	40
1	32
8	32
8	7
3	19
3	7
4	14
1	40
5	20
5	20
3	30
2	34
0	44
2	7
1	32
0	40
5	14
1	44
2	34
5	19
8	32
3	20
3	32
2	19
3	7
4	7
3	12
2	12
1	35
1	20
7	6
5	19
3	2
2	15
3	24
2	20
2	19
5	19
3	34
1	7
9	20
3	14
3	20
5	20
13	20
17	6
3	28
3	20
0	20
2	15
3	28
5	20
3	20
3	20
2	7
1	11
1	11
3	8
3	19
0	12
19	6
1	8
0	11
1	16
1	19
3	20
3	12
3	20
0	20
2	8
3	6
1	12
1	3
8	6
1	6
3	6

Margin (mm)	Years the old record stood
20	80
29	84
14	42
21	49
12	42
11	62
15	39
6	92
21	20
11	44
15	66
5	88
5	112
30	20
17	47
2	106
4	47
46	31
6	104
18	30
38	32
3	35
5	51
1	112
6	40
10	30
17	6
8	9
13	55
1	86
21	20
37	20
7	40
35	19
28	20
18	20
11	7
5	66
7	8
4	40
13	19
11	20
4	12
1	1
15	55
6	12
11	32
6	12
5	12
3	20
4	50
6	56
8	35
18	32
5	7
1	35
8	19
5	12
1	40
5	7
4	47
10	32
1	55
6	8
3	12
3	40
4	16
2	48
10	19
0	50
3	40
5	19
3	16
9	20
5	20
15	34
3	20
5	27
10	32
2	40
1	32
8	32
8	7
3	19
3	7
4	14
1	40
5	20
5	20
3	30
2	34
0	44
2	7
1	32
0	40
5	14
1	44
2	34
5	19
8	32
3	20
3	32
2	19
3	7
4	7
3	12
2	12
1	35
1	20
7	6
5	19
3	2
2	15
3	24
2	20
2	19
5	19
3	34
1	7
9	20
3	14
3	20
5	20
13	20
17	6
3	28
3	20
0	20
2	15
3	28
5	20
3	20
3	20
2	7
1	11
1	11
3	8
3	19
0	12
19	6
1	8
0	11
1	16
1	19
3	20
3	12
3	20
0	20
2	8
3	6
1	12
1	3
8	6
1	6
3	6