Extreme rain in Norway and 4 other countries, 18 to 26 August 2020

Name: Extreme rain in Norway and 4 other countries, 18 to 26 August 2020
Start: 2020-08-18
End: 2020-08-26
Location: Norway, Sweden, Germany, Netherlands, Denmark

Extreme rain in Norway and 4 other countries, 18 to 26 August 2020: 100 records at 92 stations, peak on 21 August 2020. Closed.

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

Key Facts

Extreme rain in Norway and 4 other countries, 18 to 26 August 2020 set or tied 100 station records at 92 stations.
It ran from 18 August 2020 to 26 August 2020 (9 days) and its peak day was 21 August 2020.
Status: closed.
Sandefjord set a daily record precipitation of 65.0 mm (2.6 in) on 21 August 2020.
The busiest day was 21 August 2020 with 27 records.
The oldest broken record in the ranked list had stood for 112 years.

Footprint

18 to 26 August 2020

The area covered by Extreme rain in Norway and 4 other countries, 18 to 26 August 2020 is outlined, with 20 of the stations that set records marked, coloured by record type. Made with Natural Earth.

Footprint of Extreme rain in Norway and 4 other countries, 18 to 26 August 2020: stations that set records in the event
Station	Type	Value	Date
Sandefjord	Record daily precipitation	65.0 mm (2.6 in)	2020-08-21
Helgoland	Record daily precipitation	46.8 mm (1.8 in)	2020-08-22
Bessaker	Record daily precipitation	48.0 mm (1.9 in)	2020-08-24
Aseral	Record daily precipitation	48.6 mm (1.9 in)	2020-08-21
Sagen	Record daily precipitation	63.0 mm (2.5 in)	2020-08-19
Rostock-Warnemunde	Record daily precipitation	56.3 mm (2.2 in)	2020-08-26
Hornindal	Record daily precipitation	36.4 mm (1.4 in)	2020-08-22
Gustavsfors	Record daily precipitation	33.3 mm (1.3 in)	2020-08-23
Hovlandsdal	Record daily precipitation	87.5 mm (3.4 in)	2020-08-22
Greifswald	Record daily precipitation	39.0 mm (1.5 in)	2020-08-26
Myklebust I Breim	Record daily precipitation	34.5 mm (1.4 in)	2020-08-22
Skei I Jolster	Record daily precipitation	48.0 mm (1.9 in)	2020-08-22
Erfde	Record daily precipitation	25.0 mm (1.0 in)	2020-08-24
Larvik	Record daily precipitation	41.0 mm (1.6 in)	2020-08-21
Bredbyn	Record daily precipitation	29.1 mm (1.1 in)	2020-08-22
Nelaug	Record daily precipitation	41.3 mm (1.6 in)	2020-08-21
Torungen Fyr	Record daily precipitation	28.2 mm (1.1 in)	2020-08-21
Laaghalen	Record daily precipitation	31.2 mm (1.2 in)	2020-08-25
Gross Lusewitz	Record daily precipitation	40.4 mm (1.6 in)	2020-08-26
Mogen	Record daily precipitation	22.6 mm (0.9 in)	2020-08-21

Records per Day

Peak day 27

Records set or tied each day from 18 August 2020 to 26 August 2020. The most in one day was 27 on 21 August 2020.

Records per day during Extreme rain in Norway and 4 other countries, 18 to 26 August 2020
Date	Records
2020-08-18	2
2020-08-19	2
2020-08-20	3
2020-08-21	27
2020-08-22	24
2020-08-23	11
2020-08-24	15
2020-08-25	4
2020-08-26	12

Top Records by Margin

Margin over the record replaced

Top records of Extreme rain in Norway and 4 other countries, 18 to 26 August 2020 ranked by margin
Sandefjord, 08-21	44.3 mm (1.7 in)
Bessaker, 08-24	31.4 mm (1.2 in)
Nelaug, 08-21	23.3 mm (0.9 in)
Helgoland, 08-22	22.7 mm (0.9 in)
Larvik, 08-21	22.7 mm (0.9 in)
Rostock-Warnemunde, 08-26	21.6 mm (0.9 in)
Gustavsfors, 08-23	21.2 mm (0.8 in)
Hovlandsdal, 08-22	20.6 mm (0.8 in)
Skei I Jolster, 08-22	18.3 mm (0.7 in)
Aseral, 08-21	17.2 mm (0.7 in)
Greifswald, 08-26	15.6 mm (0.6 in)
Laaghalen, 08-25	14.1 mm (0.6 in)
Bredbyn, 08-22	12.6 mm (0.5 in)
Sagen, 08-19	12.2 mm (0.5 in)
Mogen, 08-21	11.4 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

100 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 Norway and 4 other countries, 18 to 26 August 2020
Margin (mm)	Years the old record stood
44	59
23	54
31	31
17	112
12	33
22	41
7	111
21	35
16	41
21	68
2	102
18	42
11	58
7	67
23	32
13	35
23	28
14	8
4	67
9	41
1	51
3	69
18	6
13	41
10	27
17	28
14	42
1	60
18	28
21	4
1	64
3	57
3	55
6	42
8	42
8	42
2	62
7	28
2	51
5	40
6	42
4	51
2	56
8	35
6	42
21	2
3	37
6	33
12	28
11	33
4	27
5	35
10	23
1	49
7	14
7	12
3	41
2	42
8	2
6	33
2	32
1	39
7	11
3	28
4	33
5	24
1	38
4	30
8	17
3	31
2	22
2	41
3	33
1	32
5	28
6	16
5	20
1	42
4	9
11	1
3	19
10	6
5	10
4	16
1	12
0	19
1	26
7	9
1	15
1	12
0	9
1	25
1	10
3	14
2	4
1	16
2	9
1	8
3	2
1	9

Compared With Other Events

Station records per event

Station records in Extreme rain in Norway and 4 other countries, 18 to 26 August 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 Norway and 4 other countries, 18 to 26 August 2020 (this event)	100 records

Every Record Set

20 of 100

Every record set or tied during Extreme rain in Norway and 4 other countries, 18 to 26 August 2020, in date order
Date	Station	Record	Value	Margin	Years stood	Significance
2020-08-19	Sagen	Record daily precipitation	63.0 mm (2.5 in)	12.2 mm (0.5 in)	33	51 of 100 (Notable)
2020-08-21	Sandefjord	Record daily precipitation	65.0 mm (2.6 in)	44.3 mm (1.7 in)	59	63 of 100 (Major)
2020-08-21	Aseral	Record daily precipitation	48.6 mm (1.9 in)	17.2 mm (0.7 in)	112	54 of 100 (Notable)
2020-08-21	Larvik	Record daily precipitation	41.0 mm (1.6 in)	22.7 mm (0.9 in)	32	36 of 100 (Notable)
2020-08-21	Nelaug	Record daily precipitation	41.3 mm (1.6 in)	23.3 mm (0.9 in)	28	33 of 100 (Routine)
2020-08-21	Torungen Fyr	Record daily precipitation	28.2 mm (1.1 in)	3.5 mm (0.14 in)	67	32 of 100 (Routine)
2020-08-21	Mogen	Record daily precipitation	22.6 mm (0.9 in)	11.4 mm (0.4 in)	58	20 of 100 (Routine)
2020-08-22	Helgoland	Record daily precipitation	46.8 mm (1.8 in)	22.7 mm (0.9 in)	54	55 of 100 (Notable)
2020-08-22	Hornindal	Record daily precipitation	36.4 mm (1.4 in)	6.8 mm (0.27 in)	111	48 of 100 (Notable)
2020-08-22	Hovlandsdal	Record daily precipitation	87.5 mm (3.4 in)	20.6 mm (0.8 in)	68	44 of 100 (Notable)
2020-08-22	Myklebust I Breim	Record daily precipitation	34.5 mm (1.4 in)	2.4 mm (0.09 in)	102	43 of 100 (Notable)
2020-08-22	Skei I Jolster	Record daily precipitation	48.0 mm (1.9 in)	18.3 mm (0.7 in)	42	40 of 100 (Notable)
2020-08-22	Bredbyn	Record daily precipitation	29.1 mm (1.1 in)	12.6 mm (0.5 in)	35	35 of 100 (Notable)
2020-08-23	Gustavsfors	Record daily precipitation	33.3 mm (1.3 in)	21.2 mm (0.8 in)	35	46 of 100 (Notable)
2020-08-24	Bessaker	Record daily precipitation	48.0 mm (1.9 in)	31.4 mm (1.2 in)	31	55 of 100 (Notable)
2020-08-24	Erfde	Record daily precipitation	25.0 mm (1.0 in)	7.0 mm (0.28 in)	67	38 of 100 (Notable)
2020-08-25	Laaghalen	Record daily precipitation	31.2 mm (1.2 in)	14.1 mm (0.6 in)	8	32 of 100 (Routine)
2020-08-26	Rostock-Warnemunde	Record daily precipitation	56.3 mm (2.2 in)	21.6 mm (0.9 in)	41	50 of 100 (Notable)
2020-08-26	Greifswald	Record daily precipitation	39.0 mm (1.5 in)	15.6 mm (0.6 in)	41	44 of 100 (Notable)
2020-08-26	Gross Lusewitz	Record daily precipitation	40.4 mm (1.6 in)	8.9 mm (0.35 in)	41	31 of 100 (Routine)

The daily ledgers keep a limited number of records per day, so this list has 20 of the 100 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
44	59
23	54
31	31
17	112
12	33
22	41
7	111
21	35
16	41
21	68
2	102
18	42
11	58
7	67
23	32
13	35
23	28
14	8
4	67
9	41
1	51
3	69
18	6
13	41
10	27
17	28
14	42
1	60
18	28
21	4
1	64
3	57
3	55
6	42
8	42
8	42
2	62
7	28
2	51
5	40
6	42
4	51
2	56
8	35
6	42
21	2
3	37
6	33
12	28
11	33
4	27
5	35
10	23
1	49
7	14
7	12
3	41
2	42
8	2
6	33
2	32
1	39
7	11
3	28
4	33
5	24
1	38
4	30
8	17
3	31
2	22
2	41
3	33
1	32
5	28
6	16
5	20
1	42
4	9
11	1
3	19
10	6
5	10
4	16
1	12
0	19
1	26
7	9
1	15
1	12
0	9
1	25
1	10
3	14
2	4
1	16
2	9
1	8
3	2
1	9

Margin (mm)	Years the old record stood
44	59
23	54
31	31
17	112
12	33
22	41
7	111
21	35
16	41
21	68
2	102
18	42
11	58
7	67
23	32
13	35
23	28
14	8
4	67
9	41
1	51
3	69
18	6
13	41
10	27
17	28
14	42
1	60
18	28
21	4
1	64
3	57
3	55
6	42
8	42
8	42
2	62
7	28
2	51
5	40
6	42
4	51
2	56
8	35
6	42
21	2
3	37
6	33
12	28
11	33
4	27
5	35
10	23
1	49
7	14
7	12
3	41
2	42
8	2
6	33
2	32
1	39
7	11
3	28
4	33
5	24
1	38
4	30
8	17
3	31
2	22
2	41
3	33
1	32
5	28
6	16
5	20
1	42
4	9
11	1
3	19
10	6
5	10
4	16
1	12
0	19
1	26
7	9
1	15
1	12
0	9
1	25
1	10
3	14
2	4
1	16
2	9
1	8
3	2
1	9

Margin (mm)	Years the old record stood
44	59
23	54
31	31
17	112
12	33
22	41
7	111
21	35
16	41
21	68
2	102
18	42
11	58
7	67
23	32
13	35
23	28
14	8
4	67
9	41
1	51
3	69
18	6
13	41
10	27
17	28
14	42
1	60
18	28
21	4
1	64
3	57
3	55
6	42
8	42
8	42
2	62
7	28
2	51
5	40
6	42
4	51
2	56
8	35
6	42
21	2
3	37
6	33
12	28
11	33
4	27
5	35
10	23
1	49
7	14
7	12
3	41
2	42
8	2
6	33
2	32
1	39
7	11
3	28
4	33
5	24
1	38
4	30
8	17
3	31
2	22
2	41
3	33
1	32
5	28
6	16
5	20
1	42
4	9
11	1
3	19
10	6
5	10
4	16
1	12
0	19
1	26
7	9
1	15
1	12
0	9
1	25
1	10
3	14
2	4
1	16
2	9
1	8
3	2
1	9