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Data as of 2026-10-17
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Built 2026-10-19 (19 October 2026)

Heat wave in United States and Mexico, 28 February to 21 March 2021

Heat wave in United States and Mexico, 28 February to 21 March 2021: 2,135 records at 1,453 stations, peak on 10 March 2021. Closed.

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

Key Facts

  • Heat wave in United States and Mexico, 28 February to 21 March 2021 set or tied 2,135 station records at 1,453 stations.
  • It ran from 28 February 2021 to 21 March 2021 (22 days) and its peak day was 10 March 2021.
  • Status: closed.
  • Lockport 2SE set a daily record high minimum temperature of 12.8 C (55.0 F) on 11 March 2021.
  • The busiest day was 10 March 2021 with 456 records.
  • The oldest broken record in the ranked list had stood for 127 years.

Footprint

28 February to 21 March 2021
Footprint of Heat wave in United States and Mexico, 28 February to 21 March 2021 The area covered by Heat wave in United States and Mexico, 28 February to 21 March 2021 is outlined, with 20 of the stations that set records marked, coloured by record type.
The area covered by Heat wave in United States and Mexico, 28 February to 21 March 2021 is outlined, with 20 of the stations that set records marked, coloured by record type. Made with Natural Earth.
Footprint of Heat wave in United States and Mexico, 28 February to 21 March 2021: stations that set records in the event
StationTypeValueDate
Green BayRecord high minimum temperature10.0 C (50.0 F)2021-03-10
Lockport 2SERecord high minimum temperature12.8 C (55.0 F)2021-03-11
Spencer 1 NRecord high minimum temperature7.2 C (45.0 F)2021-03-09
Cedar Rapids #1Record high minimum temperature12.8 C (55.0 F)2021-03-10
Ann Arbor U of MichRecord high minimum temperature13.9 C (57.0 F)2021-03-11
Logan 1 WNWRecord high minimum temperature12.2 C (54.0 F)2021-03-10
MondoviRecord high minimum temperature10.6 C (51.1 F)2021-03-10
Grand Forks UNIV (NWS)Record high maximum temperature14.4 C (57.9 F)2021-03-08
Huron Rgnl APRecord high minimum temperature5.6 C (42.1 F)2021-03-09
Red Lake Indian AgcyRecord high maximum temperature17.2 C (63.0 F)2021-03-10
ClintonRecord high minimum temperature14.4 C (57.9 F)2021-03-10
Tecumseh 1SRecord high minimum temperature11.7 C (53.1 F)2021-03-10
CharlevoixRecord high minimum temperature6.7 C (44.1 F)2021-03-11
CheboyganRecord high minimum temperature6.1 C (43.0 F)2021-03-11
WestcliffeRecord high minimum temperature6.1 C (43.0 F)2021-03-09
Crookston NW Exp STNRecord high maximum temperature14.4 C (57.9 F)2021-03-09
HowardRecord high minimum temperature6.1 C (43.0 F)2021-03-09
Park Rapids Muni APRecord high maximum temperature16.1 C (61.0 F)2021-03-09
Helena 1 SSERecord high minimum temperature11.7 C (53.1 F)2021-03-10
GraylingRecord high minimum temperature7.2 C (45.0 F)2021-03-11

Records per Day

Peak day 456
Records per day during Heat wave in United States and Mexico, 28 February to 21 March 2021 Records set or tied each day from 28 February 2021 to 21 March 2021. The most in one day was 456 on 10 March 2021. 0 125 250 375 500 02-2803-0303-0603-0903-1203-1503-18
Records set or tied each day from 28 February 2021 to 21 March 2021. The most in one day was 456 on 10 March 2021.
Records per day during Heat wave in United States and Mexico, 28 February to 21 March 2021
DateRecords
2021-02-281
2021-03-018
2021-03-0245
2021-03-03105
2021-03-04145
2021-03-0573
2021-03-0633
2021-03-0791
2021-03-08251
2021-03-09329
2021-03-10456
2021-03-11254
2021-03-12189
2021-03-1359
2021-03-1417
2021-03-1511
2021-03-1617
2021-03-1732
2021-03-1815
2021-03-193
2021-03-211

Top Records by Margin

Margin over the record replaced
Top records of Heat wave in United States and Mexico, 28 February to 21 March 2021 ranked by margin
Mondovi, 03-107.3 C (13.1 F)
Green Bay, 03-106.7 C (12.1 F)
Spencer 1 N, 03-096.6 C (11.9 F)
Lockport 2SE, 03-115.6 C (10.1 F)
Cedar Rapids #1, 03-105.6 C (10.1 F)
Logan 1 WNW, 03-105.5 C (9.9 F)
Red Lake Indian Agcy, 03-105.5 C (9.9 F)
Grand Forks UNIV (NWS), 03-085.5 C (9.9 F)
Ann Arbor U of Mich, 03-115.0 C (9.0 F)
Charlevoix, 03-115.0 C (9.0 F)
Cheboygan, 03-115.0 C (9.0 F)
Huron Rgnl AP, 03-095.0 C (9.0 F)
Grayling, 03-115.0 C (9.0 F)
Tecumseh 1S, 03-104.5 C (8.1 F)
Clinton, 03-104.4 C (7.9 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 United States and Mexico, 28 February to 21 March 2021 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. 0 38 75 113 150 0.03.06.09.012.0 Margin (C) Years the old record stood
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 United States and Mexico, 28 February to 21 March 2021
Margin (C)Years the old record stood
5.6122
6.7119
5.6126
6.698
5.0119
5.5119
7.394
5.0119
5.0119
5.5100
4.4104
4.5126
5.5116
5.0116
3.9110
5.0100
4.4119
3.9110
4.4118
4.4110
2.8122
3.3104
2.8119
5.094
5.094
5.0119
3.9119
3.4104
3.3123
5.594
3.9119
3.9119
3.4126
3.4119
3.3126
4.4110
3.387
2.3103
2.8119
2.2119
2.7122
2.2119
4.492
2.8120
2.8119
2.7121
3.3110
2.7121
3.3126
2.2110
2.8119
3.3127
5.094
3.8116
3.9110
2.8110
2.7120
2.2119
3.394
2.2119
2.7119
2.2110
2.2119
2.2108
3.994
2.2119
2.2122
1.7104
2.2119
2.2110
3.490
1.7116
1.7119
1.7118
6.684
2.2110
1.7103
1.6111
1.7104
1.7119
1.6119
2.2120
1.7119
5.084
3.396
2.894
1.7119
2.894
1.7119
1.7119
2.298
1.7119
2.2122
1.7120
2.2126
2.2119
2.2103
1.6122
1.6126
1.7121
2.896
1.7122
1.7110
1.1122
0.5104
1.1122
0.6126
1.1126
2.396
1.1119
1.2126
1.1119
1.2119
1.1121
1.1119
1.1112
1.1119
1.1119
1.2100
1.1119
1.1119
2.294
0.6122
1.1119
1.1120
1.1120
1.1120
0.5122
0.5103
0.5103
3.392
1.1122
1.1119
1.1120
1.1110
1.1104
2.296
1.1126
0.6103
0.5116
0.6104
0.6104
0.6103
0.5111
1.1100
1.1122
0.6123
1.1102
0.6119
1.2119
1.1110
0.6126
1.694
0.6119
0.6119
0.5119
0.6126
0.6119
0.6120
1.796
0.6119
0.6126
1.694
1.794
1.694
0.5110
0.6120
1.794
0.6119
1.196
0.5110
0.6110
3.984
0.6120
0.5120
0.6119
0.6119
0.5119
0.5100
0.5103
0.5111
1.298
0.5119
0.6126
0.5120
8.366
6.179
1.194
3.484
1.194
1.194
3.484
3.484
0.696
5.668
2.384
5.567
0.692
1.684
2.884

Compared With Other Events

Station records per event
Station records in Heat wave in United States and Mexico, 28 February to 21 March 2021 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 United States and Mexico, 28 February to 21 March 2021 (this event)2,135 records

Every Record Set

20 of 2,135
Every record set or tied during Heat wave in United States and Mexico, 28 February to 21 March 2021, in date order
DateStationRecordValueMarginYears stoodSignificance
2021-03-08Grand Forks UNIV (NWS)Record high maximum temperature14.4 C (57.9 F)5.5 C (9.9 F)11647 of 100 (Notable)
2021-03-09Spencer 1 NRecord high minimum temperature7.2 C (45.0 F)6.6 C (11.9 F)9849 of 100 (Notable)
2021-03-09Huron Rgnl APRecord high minimum temperature5.6 C (42.1 F)5.0 C (9.0 F)11647 of 100 (Notable)
2021-03-09WestcliffeRecord high minimum temperature6.1 C (43.0 F)3.9 C (7.0 F)11046 of 100 (Notable)
2021-03-09Crookston NW Exp STNRecord high maximum temperature14.4 C (57.9 F)4.4 C (7.9 F)11946 of 100 (Notable)
2021-03-09HowardRecord high minimum temperature6.1 C (43.0 F)4.4 C (7.9 F)11846 of 100 (Notable)
2021-03-09Park Rapids Muni APRecord high maximum temperature16.1 C (61.0 F)4.4 C (7.9 F)11046 of 100 (Notable)
2021-03-10Green BayRecord high minimum temperature10.0 C (50.0 F)6.7 C (12.1 F)11950 of 100 (Notable)
2021-03-10Cedar Rapids #1Record high minimum temperature12.8 C (55.0 F)5.6 C (10.1 F)12649 of 100 (Notable)
2021-03-10Logan 1 WNWRecord high minimum temperature12.2 C (54.0 F)5.5 C (9.9 F)11948 of 100 (Notable)
2021-03-10MondoviRecord high minimum temperature10.6 C (51.1 F)7.3 C (13.1 F)9448 of 100 (Notable)
2021-03-10Red Lake Indian AgcyRecord high maximum temperature17.2 C (63.0 F)5.5 C (9.9 F)10047 of 100 (Notable)
2021-03-10ClintonRecord high minimum temperature14.4 C (57.9 F)4.4 C (7.9 F)10447 of 100 (Notable)
2021-03-10Tecumseh 1SRecord high minimum temperature11.7 C (53.1 F)4.5 C (8.1 F)12647 of 100 (Notable)
2021-03-10Helena 1 SSERecord high minimum temperature11.7 C (53.1 F)3.9 C (7.0 F)11046 of 100 (Notable)
2021-03-11Lockport 2SERecord high minimum temperature12.8 C (55.0 F)5.6 C (10.1 F)12250 of 100 (Notable)
2021-03-11Ann Arbor U of MichRecord high minimum temperature13.9 C (57.0 F)5.0 C (9.0 F)11949 of 100 (Notable)
2021-03-11CharlevoixRecord high minimum temperature6.7 C (44.1 F)5.0 C (9.0 F)11947 of 100 (Notable)
2021-03-11CheboyganRecord high minimum temperature6.1 C (43.0 F)5.0 C (9.0 F)11947 of 100 (Notable)
2021-03-11GraylingRecord high minimum temperature7.2 C (45.0 F)5.0 C (9.0 F)10046 of 100 (Notable)

The daily ledgers keep a limited number of records per day, so this list has 20 of the 2,135 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.