Heat wave in Argentina and 2 other countries, 17 April to 11 May 2018

Name: Heat wave in Argentina and 2 other countries, 17 April to 11 May 2018
Start: 2018-04-17
End: 2018-05-11
Location: Argentina, Uruguay, Paraguay

Heat wave in Argentina and 2 other countries, 17 April to 11 May 2018: 227 records at 47 stations, peak on 26 April 2018. Closed.

Data as of 2026-10-12. Last revised 12 October 2026 (2026-10-12).

Key Facts

Heat wave in Argentina and 2 other countries, 17 April to 11 May 2018 set or tied 227 station records at 47 stations.
It ran from 17 April 2018 to 11 May 2018 (25 days) and its peak day was 26 April 2018.
Status: closed.
Buenos Aires Observ set a daily record high maximum temperature of 32.3 C (90.1 F) on 28 April 2018.
The busiest day was 26 April 2018 with 20 records.
The oldest broken record in the ranked list had stood for 96 years.

Footprint

17 April to 11 May 2018

The area covered by Heat wave in Argentina and 2 other countries, 17 April to 11 May 2018 is outlined, with 16 of the stations that set records marked, coloured by record type. Made with Natural Earth.

Footprint of Heat wave in Argentina and 2 other countries, 17 April to 11 May 2018: stations that set records in the event
Station	Type	Value	Date
Buenos Aires Observ	Record high maximum temperature	32.3 C (90.1 F)	2018-04-28
La Rioja Aero.	Record high maximum temperature	38.5 C (101.3 F)	2018-04-24
Mercedes	Record high maximum temperature	33.3 C (91.9 F)	2018-04-20
Laboulaye Aero	Record high minimum temperature	17.9 C (64.2 F)	2018-04-19
Carrasco Intl	Record high minimum temperature	19.5 C (67.1 F)	2018-04-20
Villa Dolores	Record high minimum temperature	20.0 C (68.0 F)	2018-04-19
Junin	Record high minimum temperature	20.0 C (68.0 F)	2018-04-20
Parana Aero	Record high maximum temperature	32.3 C (90.1 F)	2018-04-23
Dolores Airport	Record high minimum temperature	18.0 C (64.4 F)	2018-04-26
Ceres Aero	Record high minimum temperature	21.0 C (69.8 F)	2018-04-30
Bahia Blanca Aero	Record high maximum temperature	31.4 C (88.5 F)	2018-04-21
Chamical Aero	Record high minimum temperature	20.4 C (68.7 F)	2018-04-22
Oran	Record high minimum temperature	22.7 C (72.9 F)	2018-04-23
Salta Aero	Record high minimum temperature	16.1 C (61.0 F)	2018-04-24
Rosario	Record high minimum temperature	21.4 C (70.5 F)	2018-04-26
Marcos Juarez	Record high minimum temperature	19.2 C (66.6 F)	2018-04-27

Records per Day

Peak day 20

Records set or tied each day from 17 April 2018 to 11 May 2018. The most in one day was 20 on 26 April 2018.

Records per day during Heat wave in Argentina and 2 other countries, 17 April to 11 May 2018
Date	Records
2018-04-17	1
2018-04-18	3
2018-04-19	4
2018-04-20	15
2018-04-21	17
2018-04-22	14
2018-04-23	17
2018-04-24	6
2018-04-25	8
2018-04-26	20
2018-04-27	15
2018-04-28	11
2018-04-29	12
2018-04-30	17
2018-05-01	5
2018-05-02	5
2018-05-03	4
2018-05-04	6
2018-05-05	4
2018-05-06	8
2018-05-07	13
2018-05-08	13
2018-05-09	5
2018-05-10	3
2018-05-11	1

Top Records by Margin

Margin over the record replaced

Top records of Heat wave in Argentina and 2 other countries, 17 April to 11 May 2018 ranked by margin
Carrasco Intl, 04-20	4.5 C (8.1 F)
La Rioja Aero., 04-24	4.3 C (7.7 F)
Rosario, 04-26	4.2 C (7.6 F)
Villa Dolores, 04-19	4.0 C (7.2 F)
Dolores Airport, 04-26	4.0 C (7.2 F)
Chamical Aero, 04-22	3.4 C (6.1 F)
Marcos Juarez, 04-27	3.2 C (5.8 F)
Mercedes, 04-20	3.1 C (5.6 F)
Junin, 04-20	3.0 C (5.4 F)
Buenos Aires Observ, 04-28	2.9 C (5.2 F)
Mercedes, 04-28	2.3 C (4.1 F)
Buenos Aires Observ, 04-19	2.2 C (4.0 F)
Oran, 04-23	1.7 C (3.1 F)
Laboulaye Aero, 04-19	1.4 C (2.5 F)
Ceres Aero, 04-30	1.2 C (2.2 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

227 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 Argentina and 2 other countries, 17 April to 11 May 2018
Margin (C)	Years the old record stood
2.9	96
2.2	68
4.3	55
3.1	48
1.4	65
4.5	39
1.2	55
0.9	55
0.3	60
4.0	37
3.0	43
4.0	36
2.3	37
0.6	53
0.9	37
0.8	55
1.7	44
3.4	39
3.2	43
4.2	31
0.4	48
1.8	44
2.1	37
1.0	48
2.3	37
1.0	14
4.5	20
0.2	48
0.5	48
1.6	37
1.4	40
0.6	48
0.1	55
3.8	28
1.8	43
1.7	43
1.0	40
0.6	48
1.8	37
2.0	39
1.7	43
2.0	37
1.2	37
1.8	35
0.1	48
0.5	40
0.6	40
2.3	24
1.5	33
1.9	37
1.2	40
0.4	40
1.9	36
3.5	24
4.9	13
1.9	37
0.4	37
0.3	43
0.4	40
0.8	0
0.8	35
1.2	33
3.4	20
1.6	37
1.2	37
1.1	37
0.7	40
1.3	37
0.6	37
0.6	37
0.4	37
1.1	35
0.3	37
0.2	6
0.1	37
0.5	36
0.4	4
0.2	40
0.2	44
1.0	36
1.0	37
1.0	37
1.1	36
1.6	36
0.5	37
3.5	17
0.5	40
0.4	43
2.6	29
1.4	29
1.8	23
3.3	15
1.2	32
0.1	36
2.5	20
0.6	37
0.8	33
0.1	41
0.4	37
2.4	24
0.2	37
2.9	20
3.1	20
0.1	32
0.9	24
0.4	28
1.3	21
1.1	24
1.3	25
1.1	28
0.2	4
0.4	0
1.6	29
0.9	31
1.3	28
1.0	27
4.1	0
2.2	20
0.2	37
0.1	37
0.4	37
1.8	24
1.2	20
3.6	3
1.0	28
3.3	12
1.8	16
1.2	27
0.6	24
0.3	24
0.8	20
0.6	21
1.7	12
0.6	28
1.1	20
0.9	25
0.6	24
1.1	21
0.5	27
1.4	20
0.7	20
0.3	24
2.1	9
1.5	11
0.1	24
0.1	29
0.1	29
1.1	21
0.6	24
0.3	28
0.1	27
3.4	5
0.3	25
2.8	4
0.2	28
1.0	20
3.3	5
0.7	25
1.1	15
1.2	15
0.5	24
0.1	23
1.8	12
0.2	24
0.4	23
0.1	24
2.4	4
0.9	11
0.1	24
0.6	23
0.2	17
1.0	8
0.9	11
0.8	15
2.0	4
2.3	4
1.9	9
2.5	0
0.4	17
2.2	5
0.4	16
0.3	20
0.5	23
1.8	3
0.3	15
1.5	4
0.7	9
0.6	12
0.6	15
0.2	12
0.7	9
2.3	0
1.6	4
0.2	11
0.4	5
0.6	4
1.2	3
0.9	12
1.2	4
1.4	4

Compared With Other Events

Station records per event

Station records in Heat wave in Argentina and 2 other countries, 17 April to 11 May 2018 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 Argentina and 2 other countries, 17 April to 11 May 2018 (this event)	227 records

Every Record Set

20 of 227

Every record set or tied during Heat wave in Argentina and 2 other countries, 17 April to 11 May 2018, in date order
Date	Station	Record	Value	Margin	Years stood	Significance
2018-04-19	Buenos Aires Observ	Record high minimum temperature	21.6 C (70.9 F)	2.2 C (4.0 F)	68	35 of 100 (Notable)
2018-04-19	Laboulaye Aero	Record high minimum temperature	17.9 C (64.2 F)	1.4 C (2.5 F)	65	28 of 100 (Routine)
2018-04-19	Villa Dolores	Record high minimum temperature	20.0 C (68.0 F)	4.0 C (7.2 F)	37	24 of 100 (Routine)
2018-04-20	Mercedes	Record high maximum temperature	33.3 C (91.9 F)	3.1 C (5.6 F)	48	29 of 100 (Routine)
2018-04-20	Carrasco Intl	Record high minimum temperature	19.5 C (67.1 F)	4.5 C (8.1 F)	39	28 of 100 (Routine)
2018-04-20	Junin	Record high minimum temperature	20.0 C (68.0 F)	3.0 C (5.4 F)	43	24 of 100 (Routine)
2018-04-21	Bahia Blanca Aero	Record high maximum temperature	31.4 C (88.5 F)	0.8 C (1.4 F)	55	23 of 100 (Routine)
2018-04-22	Chamical Aero	Record high minimum temperature	20.4 C (68.7 F)	3.4 C (6.1 F)	39	23 of 100 (Routine)
2018-04-23	Parana Aero	Record high maximum temperature	32.3 C (90.1 F)	0.9 C (1.6 F)	55	24 of 100 (Routine)
2018-04-23	Oran	Record high minimum temperature	22.7 C (72.9 F)	1.7 C (3.1 F)	44	23 of 100 (Routine)
2018-04-24	La Rioja Aero.	Record high maximum temperature	38.5 C (101.3 F)	4.3 C (7.7 F)	55	31 of 100 (Routine)
2018-04-24	Salta Aero	Record high minimum temperature	16.1 C (61.0 F)	0.6 C (1.1 F)	53	23 of 100 (Routine)
2018-04-26	Dolores Airport	Record high minimum temperature	18.0 C (64.4 F)	4.0 C (7.2 F)	36	24 of 100 (Routine)
2018-04-26	Rosario	Record high minimum temperature	21.4 C (70.5 F)	4.2 C (7.6 F)	31	23 of 100 (Routine)
2018-04-27	Buenos Aires Observ	Record high minimum temperature	22.4 C (72.3 F)	0.9 C (1.6 F)	37	23 of 100 (Routine)
2018-04-27	Marcos Juarez	Record high minimum temperature	19.2 C (66.6 F)	3.2 C (5.8 F)	43	23 of 100 (Routine)
2018-04-28	Buenos Aires Observ	Record high maximum temperature	32.3 C (90.1 F)	2.9 C (5.2 F)	96	47 of 100 (Notable)
2018-04-28	Mercedes	Record high maximum temperature	32.5 C (90.5 F)	2.3 C (4.1 F)	37	24 of 100 (Routine)
2018-04-30	Ceres Aero	Record high minimum temperature	21.0 C (69.8 F)	1.2 C (2.2 F)	55	24 of 100 (Routine)
2018-05-08	Laboulaye Aero	Record high minimum temperature	18.5 C (65.3 F)	0.3 C (0.5 F)	60	24 of 100 (Routine)

The daily ledgers keep a limited number of records per day, so this list has 20 of the 227 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 2026-10-12. 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
2.9	96
2.2	68
4.3	55
3.1	48
1.4	65
4.5	39
1.2	55
0.9	55
0.3	60
4.0	37
3.0	43
4.0	36
2.3	37
0.6	53
0.9	37
0.8	55
1.7	44
3.4	39
3.2	43
4.2	31
0.4	48
1.8	44
2.1	37
1.0	48
2.3	37
1.0	14
4.5	20
0.2	48
0.5	48
1.6	37
1.4	40
0.6	48
0.1	55
3.8	28
1.8	43
1.7	43
1.0	40
0.6	48
1.8	37
2.0	39
1.7	43
2.0	37
1.2	37
1.8	35
0.1	48
0.5	40
0.6	40
2.3	24
1.5	33
1.9	37
1.2	40
0.4	40
1.9	36
3.5	24
4.9	13
1.9	37
0.4	37
0.3	43
0.4	40
0.8	0
0.8	35
1.2	33
3.4	20
1.6	37
1.2	37
1.1	37
0.7	40
1.3	37
0.6	37
0.6	37
0.4	37
1.1	35
0.3	37
0.2	6
0.1	37
0.5	36
0.4	4
0.2	40
0.2	44
1.0	36
1.0	37
1.0	37
1.1	36
1.6	36
0.5	37
3.5	17
0.5	40
0.4	43
2.6	29
1.4	29
1.8	23
3.3	15
1.2	32
0.1	36
2.5	20
0.6	37
0.8	33
0.1	41
0.4	37
2.4	24
0.2	37
2.9	20
3.1	20
0.1	32
0.9	24
0.4	28
1.3	21
1.1	24
1.3	25
1.1	28
0.2	4
0.4	0
1.6	29
0.9	31
1.3	28
1.0	27
4.1	0
2.2	20
0.2	37
0.1	37
0.4	37
1.8	24
1.2	20
3.6	3
1.0	28
3.3	12
1.8	16
1.2	27
0.6	24
0.3	24
0.8	20
0.6	21
1.7	12
0.6	28
1.1	20
0.9	25
0.6	24
1.1	21
0.5	27
1.4	20
0.7	20
0.3	24
2.1	9
1.5	11
0.1	24
0.1	29
0.1	29
1.1	21
0.6	24
0.3	28
0.1	27
3.4	5
0.3	25
2.8	4
0.2	28
1.0	20
3.3	5
0.7	25
1.1	15
1.2	15
0.5	24
0.1	23
1.8	12
0.2	24
0.4	23
0.1	24
2.4	4
0.9	11
0.1	24
0.6	23
0.2	17
1.0	8
0.9	11
0.8	15
2.0	4
2.3	4
1.9	9
2.5	0
0.4	17
2.2	5
0.4	16
0.3	20
0.5	23
1.8	3
0.3	15
1.5	4
0.7	9
0.6	12
0.6	15
0.2	12
0.7	9
2.3	0
1.6	4
0.2	11
0.4	5
0.6	4
1.2	3
0.9	12
1.2	4
1.4	4

Margin (C)	Years the old record stood
2.9	96
2.2	68
4.3	55
3.1	48
1.4	65
4.5	39
1.2	55
0.9	55
0.3	60
4.0	37
3.0	43
4.0	36
2.3	37
0.6	53
0.9	37
0.8	55
1.7	44
3.4	39
3.2	43
4.2	31
0.4	48
1.8	44
2.1	37
1.0	48
2.3	37
1.0	14
4.5	20
0.2	48
0.5	48
1.6	37
1.4	40
0.6	48
0.1	55
3.8	28
1.8	43
1.7	43
1.0	40
0.6	48
1.8	37
2.0	39
1.7	43
2.0	37
1.2	37
1.8	35
0.1	48
0.5	40
0.6	40
2.3	24
1.5	33
1.9	37
1.2	40
0.4	40
1.9	36
3.5	24
4.9	13
1.9	37
0.4	37
0.3	43
0.4	40
0.8	0
0.8	35
1.2	33
3.4	20
1.6	37
1.2	37
1.1	37
0.7	40
1.3	37
0.6	37
0.6	37
0.4	37
1.1	35
0.3	37
0.2	6
0.1	37
0.5	36
0.4	4
0.2	40
0.2	44
1.0	36
1.0	37
1.0	37
1.1	36
1.6	36
0.5	37
3.5	17
0.5	40
0.4	43
2.6	29
1.4	29
1.8	23
3.3	15
1.2	32
0.1	36
2.5	20
0.6	37
0.8	33
0.1	41
0.4	37
2.4	24
0.2	37
2.9	20
3.1	20
0.1	32
0.9	24
0.4	28
1.3	21
1.1	24
1.3	25
1.1	28
0.2	4
0.4	0
1.6	29
0.9	31
1.3	28
1.0	27
4.1	0
2.2	20
0.2	37
0.1	37
0.4	37
1.8	24
1.2	20
3.6	3
1.0	28
3.3	12
1.8	16
1.2	27
0.6	24
0.3	24
0.8	20
0.6	21
1.7	12
0.6	28
1.1	20
0.9	25
0.6	24
1.1	21
0.5	27
1.4	20
0.7	20
0.3	24
2.1	9
1.5	11
0.1	24
0.1	29
0.1	29
1.1	21
0.6	24
0.3	28
0.1	27
3.4	5
0.3	25
2.8	4
0.2	28
1.0	20
3.3	5
0.7	25
1.1	15
1.2	15
0.5	24
0.1	23
1.8	12
0.2	24
0.4	23
0.1	24
2.4	4
0.9	11
0.1	24
0.6	23
0.2	17
1.0	8
0.9	11
0.8	15
2.0	4
2.3	4
1.9	9
2.5	0
0.4	17
2.2	5
0.4	16
0.3	20
0.5	23
1.8	3
0.3	15
1.5	4
0.7	9
0.6	12
0.6	15
0.2	12
0.7	9
2.3	0
1.6	4
0.2	11
0.4	5
0.6	4
1.2	3
0.9	12
1.2	4
1.4	4