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Built 2026-10-19 (19 October 2026)

Heat wave in Argentina and 5 other countries, 21 February to 9 March 2025

Heat wave in Argentina and 5 other countries, 21 February to 9 March 2025: 243 records at 62 stations, peak on 6 March 2025. Closed.

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

Key Facts

  • Heat wave in Argentina and 5 other countries, 21 February to 9 March 2025 set or tied 243 station records at 62 stations.
  • It ran from 21 February 2025 to 9 March 2025 (17 days) and its peak day was 6 March 2025.
  • Status: closed.
  • Buenos Aires Observ set a daily record high minimum temperature of 24.7 C (76.5 F) on 5 March 2025.
  • The busiest day was 5 March 2025 with 28 records.
  • The oldest broken record in the ranked list had stood for 94 years.

Footprint

21 February to 9 March 2025
Footprint of Heat wave in Argentina and 5 other countries, 21 February to 9 March 2025 The area covered by Heat wave in Argentina and 5 other countries, 21 February to 9 March 2025 is outlined, with 13 of the stations that set records marked, coloured by record type.
The area covered by Heat wave in Argentina and 5 other countries, 21 February to 9 March 2025 is outlined, with 13 of the stations that set records marked, coloured by record type. Made with Natural Earth.
Footprint of Heat wave in Argentina and 5 other countries, 21 February to 9 March 2025: stations that set records in the event
StationTypeValueDate
Buenos Aires ObservRecord high minimum temperature24.7 C (76.5 F)2025-03-05
MercedesRecord high minimum temperature24.6 C (76.3 F)2025-03-05
La SerenaRecord high maximum temperature29.9 C (85.8 F)2025-03-02
Ceres AeroRecord high minimum temperature28.4 C (83.1 F)2025-02-24
RochaRecord high minimum temperature25.0 C (77.0 F)2025-03-07
PaysanduRecord high minimum temperature25.0 C (77.0 F)2025-03-06
SaltoRecord high minimum temperature28.9 C (84.0 F)2025-03-03
Parana AeroRecord high minimum temperature26.4 C (79.5 F)2025-03-06
Comodoro PierresteguiRecord high minimum temperature27.4 C (81.3 F)2025-03-06
GualeguaychuRecord high minimum temperature25.8 C (78.4 F)2025-03-06
Mar del Plata AeroRecord high minimum temperature22.8 C (73.0 F)2025-02-23
Marcos JuarezRecord high minimum temperature25.0 C (77.0 F)2025-03-06
Laboulaye AeroRecord high minimum temperature23.5 C (74.3 F)2025-02-23

Records per Day

Peak day 28
Records per day during Heat wave in Argentina and 5 other countries, 21 February to 9 March 2025 Records set or tied each day from 21 February 2025 to 9 March 2025. The most in one day was 28 on 5 March 2025. 0 8 15 23 30 02-2102-2302-2502-2703-0103-0303-0503-0703-09
Records set or tied each day from 21 February 2025 to 9 March 2025. The most in one day was 28 on 5 March 2025.
Records per day during Heat wave in Argentina and 5 other countries, 21 February to 9 March 2025
DateRecords
2025-02-216
2025-02-2221
2025-02-2320
2025-02-2424
2025-02-2518
2025-02-2615
2025-02-278
2025-02-282
2025-03-018
2025-03-028
2025-03-0313
2025-03-0417
2025-03-0528
2025-03-0628
2025-03-0721
2025-03-085
2025-03-091

Top Records by Margin

Margin over the record replaced
Top records of Heat wave in Argentina and 5 other countries, 21 February to 9 March 2025 ranked by margin
Comodoro Pierrestegui, 03-065.2 C (9.4 F)
La Serena, 03-034.2 C (7.6 F)
Marcos Juarez, 03-064.0 C (7.2 F)
Mercedes, 03-053.6 C (6.5 F)
Parana Aero, 03-063.0 C (5.4 F)
Gualeguaychu, 03-063.0 C (5.4 F)
Salto, 03-032.3 C (4.1 F)
Ceres Aero, 03-012.2 C (4.0 F)
Paysandu, 03-062.0 C (3.6 F)
Mercedes, 03-061.9 C (3.4 F)
Paysandu, 03-051.7 C (3.1 F)
La Serena, 03-021.4 C (2.5 F)
Mercedes, 03-071.0 C (1.8 F)
Buenos Aires Observ, 02-210.6 C (1.1 F)
Rocha, 03-070.5 C (0.9 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

Margin against age of the broken record in Heat wave in Argentina and 5 other countries, 21 February to 9 March 2025 243 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. 0 25 50 75 100 0.01.53.04.56.0 Margin (C) Years the old record stood
243 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 5 other countries, 21 February to 9 March 2025
Margin (C)Years the old record stood
0.194
3.667
1.48
0.261
0.533
4.215
2.067
2.338
1.767
0.283
2.266
0.672
1.072
3.055
5.240
3.056
0.241
4.048
1.955
0.171
0.344
1.158
2.055
2.450
1.822
3.838
0.656
0.238
0.560
1.850
2.448
2.048
3.038
0.362
2.440
0.360
0.823
2.248
2.744
0.355
0.856
0.656
0.655
3.124
2.141
1.051
2.040
2.628
0.724
4.622
2.337
2.041
2.438
0.848
0.948
0.848
1.744
1.548
1.348
0.348
0.941
2.34
1.342
2.139
2.326
0.422
1.544
3.527
0.422
1.441
1.536
3.621
1.440
1.444
1.044
2.040
1.246
2.225
1.636
2.823
0.155
1.81
2.624
0.444
0.347
0.546
0.548
0.97
0.644
0.438
0.242
2.520
0.341
0.444
3.88
0.744
0.148
0.238
0.338
2.421
0.50
0.238
2.515
0.538
0.242
3.78
2.125
0.642
0.738
2.916
2.224
0.738
1.038
0.244
1.829
0.60
0.135
2.022
0.10
3.36
1.226
0.40
1.818
2.120
1.823
0.538
1.820
0.827
1.329
1.136
0.242
2.616
0.242
1.028
2.716
2.59
0.30
0.232
0.10
0.20
0.40
0.60
1.424
1.526
1.626
0.236
0.62
3.61
1.912
0.824
0.236
1.224
0.134
2.96
0.10
0.10
4.03
1.522
1.326
0.235
0.924
3.02
0.424
0.824
1.416
0.624
2.38
2.19
1.318
0.724
2.48
0.926
0.925
0.426
2.22
1.68
1.52
1.815
2.28
0.424
2.08
1.715
0.524
0.726
1.220
0.820
1.89
0.624
0.626
0.324
0.423
0.423
0.324
0.325
0.616
1.016
1.016
0.422
0.423
0.326

Compared With Other Events

Station records per event
Station records in Heat wave in Argentina and 5 other countries, 21 February to 9 March 2025 compared with similar events
Heat wave in United States and Mexico, 16 January to 14 February 20249,869 records
Heat wave in United States, 28 January to 24 February 20266,528 records
Heat wave in United States and Mexico, 24 May to 19 June 20205,047 records
Heat wave in United States and Mexico, 26 March to 17 April 20213,669 records
Heat wave in Germany and 49 other countries, 18 December 2021 to 15 January 20223,626 records
Heat wave in Argentina and 5 other countries, 21 February to 9 March 2025 (this event)243 records

Every Record Set

20 of 243
Every record set or tied during Heat wave in Argentina and 5 other countries, 21 February to 9 March 2025, in date order
DateStationRecordValueMarginYears stoodSignificance
2025-02-21Buenos Aires ObservRecord high minimum temperature25.4 C (77.7 F)0.6 C (1.1 F)7232 of 100 (Routine)
2025-02-23Mar del Plata AeroRecord high minimum temperature22.8 C (73.0 F)0.2 C (0.4 F)4129 of 100 (Routine)
2025-02-23Laboulaye AeroRecord high minimum temperature23.5 C (74.3 F)0.1 C (0.2 F)7128 of 100 (Routine)
2025-02-24Ceres AeroRecord high minimum temperature28.4 C (83.1 F)0.2 C (0.4 F)6135 of 100 (Notable)
2025-02-24MercedesRecord high minimum temperature23.2 C (73.8 F)0.2 C (0.4 F)8333 of 100 (Routine)
2025-03-01Ceres AeroRecord high minimum temperature26.0 C (78.8 F)2.2 C (4.0 F)6632 of 100 (Routine)
2025-03-02La SerenaRecord high maximum temperature29.9 C (85.8 F)1.4 C (2.5 F)836 of 100 (Notable)
2025-03-03La SerenaRecord high maximum temperature28.4 C (83.1 F)4.2 C (7.6 F)1534 of 100 (Routine)
2025-03-03SaltoRecord high minimum temperature28.9 C (84.0 F)2.3 C (4.1 F)3833 of 100 (Routine)
2025-03-05Buenos Aires ObservRecord high minimum temperature24.7 C (76.5 F)0.1 C (0.2 F)9438 of 100 (Notable)
2025-03-05MercedesRecord high minimum temperature24.6 C (76.3 F)3.6 C (6.5 F)6738 of 100 (Notable)
2025-03-05PaysanduRecord high minimum temperature23.7 C (74.7 F)1.7 C (3.1 F)6733 of 100 (Routine)
2025-03-06PaysanduRecord high minimum temperature25.0 C (77.0 F)2.0 C (3.6 F)6734 of 100 (Routine)
2025-03-06Parana AeroRecord high minimum temperature26.4 C (79.5 F)3.0 C (5.4 F)5531 of 100 (Routine)
2025-03-06Comodoro PierresteguiRecord high minimum temperature27.4 C (81.3 F)5.2 C (9.4 F)4031 of 100 (Routine)
2025-03-06GualeguaychuRecord high minimum temperature25.8 C (78.4 F)3.0 C (5.4 F)5631 of 100 (Routine)
2025-03-06Marcos JuarezRecord high minimum temperature25.0 C (77.0 F)4.0 C (7.2 F)4829 of 100 (Routine)
2025-03-06MercedesRecord high minimum temperature24.8 C (76.6 F)1.9 C (3.4 F)5529 of 100 (Routine)
2025-03-07RochaRecord high minimum temperature25.0 C (77.0 F)0.5 C (0.9 F)3335 of 100 (Notable)
2025-03-07MercedesRecord high minimum temperature24.0 C (75.2 F)1.0 C (1.8 F)7232 of 100 (Routine)

The daily ledgers keep a limited number of records per day, so this list has 20 of the 243 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.