Heat wave in Sweden and 20 other countries, 11 to 29 June 2020

Name: Heat wave in Sweden and 20 other countries, 11 to 29 June 2020
Start: 2020-06-11
End: 2020-06-29
Location: Sweden, Norway, Finland, Germany, United Kingdom, Netherlands, Russia, Estonia, Spain, France, Belarus, Poland, Denmark, Ukraine, Latvia, Morocco, Lithuania, Algeria, Czech Republic, Ireland, Portugal

Heat wave in Sweden and 20 other countries, 11 to 29 June 2020: 1,829 records at 552 stations, peak on 25 June 2020. Closed.

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

Key Facts

Heat wave in Sweden and 20 other countries, 11 to 29 June 2020 set or tied 1,829 station records at 552 stations.
It ran from 11 June 2020 to 29 June 2020 (19 days) and its peak day was 25 June 2020.
Status: closed.
Vestervig set a monthly record high minimum temperature of 18.9 C (66.0 F) on 26 June 2020.
The busiest day was 25 June 2020 with 189 records.
The oldest broken record in the ranked list had stood for 199 years.

Footprint

11 to 29 June 2020

The area covered by Heat wave in Sweden and 20 other countries, 11 to 29 June 2020 is outlined, with 17 of the stations that set records marked, coloured by record type. Made with Natural Earth.

Footprint of Heat wave in Sweden and 20 other countries, 11 to 29 June 2020: stations that set records in the event
Station	Type	Value	Date
Vestervig	Record high minimum temperature	18.9 C (66.0 F)	2020-06-26
Nordoyan Fyr	Record high maximum temperature	28.7 C (83.7 F)	2020-06-20
Kristianstad	Record high minimum temperature	17.4 C (63.3 F)	2020-06-12
Trondheim - Voll	Record high minimum temperature	19.8 C (67.6 F)	2020-06-28
Velikie Luki	Record high maximum temperature	33.3 C (91.9 F)	2020-06-19
Oxford	Record high maximum temperature	31.7 C (89.1 F)	2020-06-23
Uppsala_Aut	Record high maximum temperature	30.7 C (87.3 F)	2020-06-25
Utsira Fyr	Record high minimum temperature	19.2 C (66.6 F)	2020-06-27
Hoburg	Record high maximum temperature	27.0 C (80.6 F)	2020-06-27
Torungen Fyr	Record high minimum temperature	16.2 C (61.2 F)	2020-06-14
St. Petersburg	Record high maximum temperature	32.4 C (90.3 F)	2020-06-18
Bradford	Record high maximum temperature	27.8 C (82.0 F)	2020-06-23
Durham	Record high minimum temperature	15.4 C (59.7 F)	2020-06-24
Utsira Fyr	Record high maximum temperature	24.6 C (76.3 F)	2020-06-27
Visby_Flygplats	Record high maximum temperature	30.0 C (86.0 F)	2020-06-27
Kiel-Holtenau	Record high maximum temperature	29.5 C (85.1 F)	2020-06-27
Glomfjord	Record high minimum temperature	16.1 C (61.0 F)	2020-06-28

Records per Day

Peak day 189

Records set or tied each day from 11 June 2020 to 29 June 2020. The most in one day was 189 on 25 June 2020.

Records per day during Heat wave in Sweden and 20 other countries, 11 to 29 June 2020
Date	Records
2020-06-11	2
2020-06-12	30
2020-06-13	99
2020-06-14	98
2020-06-15	53
2020-06-16	94
2020-06-17	97
2020-06-18	92
2020-06-19	90
2020-06-20	91
2020-06-21	84
2020-06-22	79
2020-06-23	128
2020-06-24	161
2020-06-25	189
2020-06-26	156
2020-06-27	180
2020-06-28	80
2020-06-29	26

Top Records by Margin

Margin over the record replaced

Top records of Heat wave in Sweden and 20 other countries, 11 to 29 June 2020 ranked by margin
Trondheim - Voll, 06-28	4.6 C (8.3 F)
Utsira Fyr, 06-27	4.1 C (7.4 F)
Kiel-Holtenau, 06-27	3.4 C (6.1 F)
Hoburg, 06-27	3.0 C (5.4 F)
Trondheim - Voll, 06-21	2.1 C (3.8 F)
Trondheim - Voll, 06-22	1.7 C (3.1 F)
Uppsala_Aut, 06-25	1.6 C (2.9 F)
Kristianstad, 06-12	1.4 C (2.5 F)
Velikie Luki, 06-19	1.4 C (2.5 F)
Glomfjord, 06-28	1.3 C (2.3 F)
Nordoyan Fyr, 06-20	1.1 C (2.0 F)
Oxford, 06-23	1.1 C (2.0 F)
St. Petersburg, 06-18	1.1 C (2.0 F)
Bradford, 06-23	1.1 C (2.0 F)
Visby_Flygplats, 06-27	1.0 C (1.8 F)

Margin is how far the new value is beyond the record it replaced. Ties are not shown.

Margin Against Age of the Broken Record

500 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 Heat wave in Sweden and 20 other countries, 11 to 29 June 2020
Margin (C)	Years the old record stood
0.1	131
1.1	50
4.6	73
1.4	123
0.5	72
1.4	119
3.0	85
1.6	152
1.1	199
0.6	106
4.1	67
1.1	115
1.0	115
1.1	99
0.7	114
0.4	103
3.4	85
1.3	93
2.1	54
1.7	90
0.2	51
0.7	133
0.4	133
0.4	160
6.4	60
1.0	99
1.0	99
0.4	108
1.6	80
0.1	110
0.4	115
1.0	44
0.2	119
0.1	128
1.0	85
1.3	80
0.3	44
2.0	84
0.6	73
2.6	67
1.6	54
0.1	72
5.0	67
1.0	85
2.3	63
0.8	86
2.0	81
2.1	67
1.8	80
0.3	87
5.9	62
4.3	61
2.4	81
2.3	82
1.3	85
0.3	90
0.1	66
0.5	85
0.5	87
0.4	85
4.3	67
0.2	87
0.3	61
0.2	66
1.2	56
0.4	61
1.9	47
2.6	67
2.2	43
2.3	79
0.7	85
0.6	85
0.4	81
1.0	77
2.0	67
2.1	67
4.4	62
3.6	67
2.8	67
1.2	50
0.2	85
0.6	84
0.4	81
0.4	81
2.0	70
0.5	81
1.3	54
2.9	61
0.2	54
1.0	76
1.1	81
1.0	80
3.2	54
1.7	60
0.2	85
0.1	84
1.2	68
0.5	54
1.2	47
0.5	54
1.1	67
1.4	67
3.3	62
2.1	67
2.2	67
3.1	51
1.6	75
0.9	50
1.3	75
2.4	67
5.6	51
2.2	69
1.9	73
2.5	73
2.4	73
3.4	67
0.4	70
4.1	29
0.6	67
0.1	54
1.2	73
2.1	67
3.1	61
5.8	30
2.3	67
4.1	54
0.4	54
1.3	73
2.5	67
1.0	66
1.0	66
1.1	67
1.5	67
1.4	73
2.0	73
2.3	73
1.1	60
0.2	56
2.2	55
1.9	55
2.0	63
3.5	47
0.8	67
2.2	54
0.9	67
0.7	75
2.1	62
0.9	67
1.5	68
1.4	75
1.5	67
1.0	67
0.9	73
0.4	73
1.3	67
1.5	41
0.8	50
1.1	73
2.5	60
4.5	32
0.1	47
3.5	54
2.2	60
1.1	43
0.8	68
2.0	56
2.2	59
1.5	56
1.2	67
0.6	67
2.4	51
2.4	51
1.9	54
1.2	50
0.6	61
1.1	67
1.4	28
2.0	54
0.6	73
2.9	54
0.8	67
1.3	67
3.3	43
2.4	18
3.3	54
3.2	46
2.2	51
1.4	67
2.5	55
1.0	67
1.4	67
1.4	67
0.1	73
0.4	49
0.4	47
1.1	73
1.0	73
1.1	73
1.8	67
2.2	59

Compared With Other Events

Station records per event

Station records in Heat wave in Sweden and 20 other countries, 11 to 29 June 2020 compared with similar events
Heat wave in United States and Mexico, 16 January to 14 February 2024	9,869 records
Heat wave in United States, 28 January to 24 February 2026	6,528 records
Heat wave in United States and Mexico, 24 May to 19 June 2020	5,047 records
Heat wave in United States and Mexico, 26 March to 17 April 2021	3,669 records
Heat wave in Germany and 49 other countries, 18 December 2021 to 15 January 2022	3,626 records
Heat wave in Sweden and 20 other countries, 11 to 29 June 2020 (this event)	1,829 records

Every Record Set

20 of 1,829

Every record set or tied during Heat wave in Sweden and 20 other countries, 11 to 29 June 2020, in date order
Date	Station	Record	Value	Margin	Years stood	Significance
2020-06-12	Kristianstad	Record high minimum temperature	17.4 C (63.3 F)	1.4 C (2.5 F)	123	44 of 100 (Notable)
2020-06-14	Torungen Fyr	Record high minimum temperature	16.2 C (61.2 F)	0.6 C (1.1 F)	106	42 of 100 (Notable)
2020-06-18	St. Petersburg	Record high maximum temperature	32.4 C (90.3 F)	1.1 C (2.0 F)	115	42 of 100 (Notable)
2020-06-19	Velikie Luki	Record high maximum temperature	33.3 C (91.9 F)	1.4 C (2.5 F)	119	43 of 100 (Notable)
2020-06-19	Vestervig	Record high minimum temperature	16.1 C (61.0 F)	0.4 C (0.7 F)	103	41 of 100 (Notable)
2020-06-20	Nordoyan Fyr	Record high maximum temperature	28.7 C (83.7 F)	1.1 C (2.0 F)	50	45 of 100 (Notable)
2020-06-21	Trondheim - Voll	Record high minimum temperature	20.3 C (68.5 F)	2.1 C (3.8 F)	54	41 of 100 (Notable)
2020-06-22	Trondheim - Voll	Record high minimum temperature	16.5 C (61.7 F)	1.7 C (3.1 F)	90	41 of 100 (Notable)
2020-06-23	Oxford	Record high maximum temperature	31.7 C (89.1 F)	1.1 C (2.0 F)	199	43 of 100 (Notable)
2020-06-23	Bradford	Record high maximum temperature	27.8 C (82.0 F)	1.1 C (2.0 F)	99	42 of 100 (Notable)
2020-06-24	Durham	Record high minimum temperature	15.4 C (59.7 F)	0.7 C (1.3 F)	114	42 of 100 (Notable)
2020-06-25	Uppsala_Aut	Record high maximum temperature	30.7 C (87.3 F)	1.6 C (2.9 F)	152	43 of 100 (Notable)
2020-06-26	Vestervig	Record high minimum temperature	18.9 C (66.0 F)	0.1 C (0.2 F)	131	50 of 100 (Notable)
2020-06-27	Utsira Fyr	Record high minimum temperature	19.2 C (66.6 F)	0.5 C (0.9 F)	72	43 of 100 (Notable)
2020-06-27	Hoburg	Record high maximum temperature	27.0 C (80.6 F)	3.0 C (5.4 F)	85	43 of 100 (Notable)
2020-06-27	Utsira Fyr	Record high maximum temperature	24.6 C (76.3 F)	4.1 C (7.4 F)	67	42 of 100 (Notable)
2020-06-27	Visby_Flygplats	Record high maximum temperature	30.0 C (86.0 F)	1.0 C (1.8 F)	115	42 of 100 (Notable)
2020-06-27	Kiel-Holtenau	Record high maximum temperature	29.5 C (85.1 F)	3.4 C (6.1 F)	85	41 of 100 (Notable)
2020-06-28	Trondheim - Voll	Record high minimum temperature	19.8 C (67.6 F)	4.6 C (8.3 F)	73	44 of 100 (Notable)
2020-06-28	Glomfjord	Record high minimum temperature	16.1 C (61.0 F)	1.3 C (2.3 F)	93	41 of 100 (Notable)

The daily ledgers keep a limited number of records per day, so this list has 20 of the 1,829 records the event counts. The counts above use the full total.

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 (C)	Years the old record stood
0.1	131
1.1	50
4.6	73
1.4	123
0.5	72
1.4	119
3.0	85
1.6	152
1.1	199
0.6	106
4.1	67
1.1	115
1.0	115
1.1	99
0.7	114
0.4	103
3.4	85
1.3	93
2.1	54
1.7	90
0.2	51
0.7	133
0.4	133
0.4	160
6.4	60
1.0	99
1.0	99
0.4	108
1.6	80
0.1	110
0.4	115
1.0	44
0.2	119
0.1	128
1.0	85
1.3	80
0.3	44
2.0	84
0.6	73
2.6	67
1.6	54
0.1	72
5.0	67
1.0	85
2.3	63
0.8	86
2.0	81
2.1	67
1.8	80
0.3	87
5.9	62
4.3	61
2.4	81
2.3	82
1.3	85
0.3	90
0.1	66
0.5	85
0.5	87
0.4	85
4.3	67
0.2	87
0.3	61
0.2	66
1.2	56
0.4	61
1.9	47
2.6	67
2.2	43
2.3	79
0.7	85
0.6	85
0.4	81
1.0	77
2.0	67
2.1	67
4.4	62
3.6	67
2.8	67
1.2	50
0.2	85
0.6	84
0.4	81
0.4	81
2.0	70
0.5	81
1.3	54
2.9	61
0.2	54
1.0	76
1.1	81
1.0	80
3.2	54
1.7	60
0.2	85
0.1	84
1.2	68
0.5	54
1.2	47
0.5	54
1.1	67
1.4	67
3.3	62
2.1	67
2.2	67
3.1	51
1.6	75
0.9	50
1.3	75
2.4	67
5.6	51
2.2	69
1.9	73
2.5	73
2.4	73
3.4	67
0.4	70
4.1	29
0.6	67
0.1	54
1.2	73
2.1	67
3.1	61
5.8	30
2.3	67
4.1	54
0.4	54
1.3	73
2.5	67
1.0	66
1.0	66
1.1	67
1.5	67
1.4	73
2.0	73
2.3	73
1.1	60
0.2	56
2.2	55
1.9	55
2.0	63
3.5	47
0.8	67
2.2	54
0.9	67
0.7	75
2.1	62
0.9	67
1.5	68
1.4	75
1.5	67
1.0	67
0.9	73
0.4	73
1.3	67
1.5	41
0.8	50
1.1	73
2.5	60
4.5	32
0.1	47
3.5	54
2.2	60
1.1	43
0.8	68
2.0	56
2.2	59
1.5	56
1.2	67
0.6	67
2.4	51
2.4	51
1.9	54
1.2	50
0.6	61
1.1	67
1.4	28
2.0	54
0.6	73
2.9	54
0.8	67
1.3	67
3.3	43
2.4	18
3.3	54
3.2	46
2.2	51
1.4	67
2.5	55
1.0	67
1.4	67
1.4	67
0.1	73
0.4	49
0.4	47
1.1	73
1.0	73
1.1	73
1.8	67
2.2	59

Margin (C)	Years the old record stood
0.1	131
1.1	50
4.6	73
1.4	123
0.5	72
1.4	119
3.0	85
1.6	152
1.1	199
0.6	106
4.1	67
1.1	115
1.0	115
1.1	99
0.7	114
0.4	103
3.4	85
1.3	93
2.1	54
1.7	90
0.2	51
0.7	133
0.4	133
0.4	160
6.4	60
1.0	99
1.0	99
0.4	108
1.6	80
0.1	110
0.4	115
1.0	44
0.2	119
0.1	128
1.0	85
1.3	80
0.3	44
2.0	84
0.6	73
2.6	67
1.6	54
0.1	72
5.0	67
1.0	85
2.3	63
0.8	86
2.0	81
2.1	67
1.8	80
0.3	87
5.9	62
4.3	61
2.4	81
2.3	82
1.3	85
0.3	90
0.1	66
0.5	85
0.5	87
0.4	85
4.3	67
0.2	87
0.3	61
0.2	66
1.2	56
0.4	61
1.9	47
2.6	67
2.2	43
2.3	79
0.7	85
0.6	85
0.4	81
1.0	77
2.0	67
2.1	67
4.4	62
3.6	67
2.8	67
1.2	50
0.2	85
0.6	84
0.4	81
0.4	81
2.0	70
0.5	81
1.3	54
2.9	61
0.2	54
1.0	76
1.1	81
1.0	80
3.2	54
1.7	60
0.2	85
0.1	84
1.2	68
0.5	54
1.2	47
0.5	54
1.1	67
1.4	67
3.3	62
2.1	67
2.2	67
3.1	51
1.6	75
0.9	50
1.3	75
2.4	67
5.6	51
2.2	69
1.9	73
2.5	73
2.4	73
3.4	67
0.4	70
4.1	29
0.6	67
0.1	54
1.2	73
2.1	67
3.1	61
5.8	30
2.3	67
4.1	54
0.4	54
1.3	73
2.5	67
1.0	66
1.0	66
1.1	67
1.5	67
1.4	73
2.0	73
2.3	73
1.1	60
0.2	56
2.2	55
1.9	55
2.0	63
3.5	47
0.8	67
2.2	54
0.9	67
0.7	75
2.1	62
0.9	67
1.5	68
1.4	75
1.5	67
1.0	67
0.9	73
0.4	73
1.3	67
1.5	41
0.8	50
1.1	73
2.5	60
4.5	32
0.1	47
3.5	54
2.2	60
1.1	43
0.8	68
2.0	56
2.2	59
1.5	56
1.2	67
0.6	67
2.4	51
2.4	51
1.9	54
1.2	50
0.6	61
1.1	67
1.4	28
2.0	54
0.6	73
2.9	54
0.8	67
1.3	67
3.3	43
2.4	18
3.3	54
3.2	46
2.2	51
1.4	67
2.5	55
1.0	67
1.4	67
1.4	67
0.1	73
0.4	49
0.4	47
1.1	73
1.0	73
1.1	73
1.8	67
2.2	59