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Built 2026-10-14 (14 October 2026)

Heat wave in United States and Mexico, 26 March to 17 April 2021

Heat wave in United States and Mexico, 26 March to 17 April 2021: 3,669 records at 1,733 stations, peak on 4 April 2021. Closed.

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

Key Facts

  • Heat wave in United States and Mexico, 26 March to 17 April 2021 set or tied 3,669 station records at 1,733 stations.
  • It ran from 26 March 2021 to 17 April 2021 (23 days) and its peak day was 4 April 2021.
  • Status: closed.
  • Charlevoix set a daily record high maximum temperature of 28.3 C (82.9 F) on 9 April 2021.
  • The busiest day was 4 April 2021 with 822 records.
  • The oldest broken record in the ranked list had stood for 127 years.

Footprint

26 March to 17 April 2021
Footprint of Heat wave in United States and Mexico, 26 March to 17 April 2021 The area covered by Heat wave in United States and Mexico, 26 March to 17 April 2021 is outlined, with 17 of the stations that set records marked, coloured by record type.
The area covered by Heat wave in United States and Mexico, 26 March to 17 April 2021 is outlined, with 17 of the stations that set records marked, coloured by record type. Made with Natural Earth.
Footprint of Heat wave in United States and Mexico, 26 March to 17 April 2021: stations that set records in the event
StationTypeValueDate
CharlevoixRecord high maximum temperature28.3 C (82.9 F)2021-04-09
FriendshipRecord high minimum temperature13.3 C (55.9 F)2021-04-08
RhinelanderRecord high minimum temperature11.1 C (52.0 F)2021-04-08
Castle RockRecord high minimum temperature12.2 C (54.0 F)2021-04-04
Onaway 4NRecord high minimum temperature12.8 C (55.0 F)2021-04-08
PrimgharRecord high minimum temperature13.9 C (57.0 F)2021-04-05
Spirit LakeRecord high maximum temperature28.3 C (82.9 F)2021-04-06
Hayward RsRecord high maximum temperature28.9 C (84.0 F)2021-04-06
Bergland DamRecord high minimum temperature7.2 C (45.0 F)2021-04-09
PostvilleRecord high minimum temperature13.3 C (55.9 F)2021-04-08
Detour VillageRecord high minimum temperature5.0 C (41.0 F)2021-04-09
GaylordRecord high minimum temperature10.0 C (50.0 F)2021-04-09
PetoskeyRecord high maximum temperature27.8 C (82.0 F)2021-04-09
RidgwayRecord high minimum temperature11.7 C (53.1 F)2021-04-11
ParadiseRecord high minimum temperature13.3 C (55.9 F)2021-04-06
Stambaugh 2SSERecord high minimum temperature9.4 C (48.9 F)2021-04-07
Dunkirk Chautauqua Co APRecord high minimum temperature15.6 C (60.1 F)2021-04-09

Records per Day

Peak day 822
Records per day during Heat wave in United States and Mexico, 26 March to 17 April 2021 Records set or tied each day from 26 March 2021 to 17 April 2021. The most in one day was 822 on 4 April 2021. 0 250 500 750 1,000 03-2603-2904-0104-0404-0704-1004-1304-16
Records set or tied each day from 26 March 2021 to 17 April 2021. The most in one day was 822 on 4 April 2021.
Records per day during Heat wave in United States and Mexico, 26 March to 17 April 2021
DateRecords
2021-03-262
2021-03-2711
2021-03-2898
2021-03-2945
2021-03-3055
2021-03-3146
2021-04-0199
2021-04-02260
2021-04-03625
2021-04-04822
2021-04-05512
2021-04-06269
2021-04-07111
2021-04-08230
2021-04-09181
2021-04-1089
2021-04-1189
2021-04-1244
2021-04-1341
2021-04-1419
2021-04-1513
2021-04-167
2021-04-171

Top Records by Margin

Margin over the record replaced
Top records of Heat wave in United States and Mexico, 26 March to 17 April 2021 ranked by margin
Charlevoix, 04-0912.7 C (22.9 F)
Friendship, 04-0810.5 C (18.9 F)
Dunkirk Chautauqua Co AP, 04-098.4 C (15.1 F)
Rhinelander, 04-086.7 C (12.1 F)
Onaway 4N, 04-086.7 C (12.1 F)
Petoskey, 04-096.7 C (12.1 F)
Castle Rock, 04-046.6 C (11.9 F)
Spirit Lake, 04-065.5 C (9.9 F)
Hayward Rs, 04-065.0 C (9.0 F)
Stambaugh 2SSE, 04-075.0 C (9.0 F)
Primghar, 04-054.5 C (8.1 F)
Gaylord, 04-094.4 C (7.9 F)
Charlevoix, 04-093.9 C (7.0 F)
Postville, 04-083.9 C (7.0 F)
Bergland Dam, 04-093.9 C (7.0 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, 26 March to 17 April 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 0.03.87.511.315.0 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, 26 March to 17 April 2021
Margin (C)Years the old record stood
12.7116
10.587
6.7111
6.692
3.9102
6.790
4.5125
3.9111
5.5120
3.9102
2.8119
4.4106
6.790
3.9102
5.0120
2.7102
3.999
5.096
8.468
3.392
3.399
3.9108
2.3106
3.996
2.8102
2.3125
1.7102
5.074
2.299
2.3116
1.7125
3.3100
2.2102
3.3100
2.2125
2.3127
2.8100
2.2100
1.7100
1.7100
1.7100
2.2112
2.7108
5.576
2.2100
1.7120
2.2108
1.7126
2.899
1.6100
2.8100
4.578
1.1106
2.892
3.992
1.1100
1.7127
2.2104
3.490
1.1100
1.1100
1.7100
1.1104
1.1111
1.799
1.6108
1.1121
2.2108
1.1100
1.1112
2.896
3.990
1.6111
0.6116
2.288
0.6106
1.1120
0.6100
0.6102
4.476
1.2127
0.6120
1.2111
0.6106
1.1100
1.1100
1.1100
0.6100
1.199
1.1100
1.1108
1.198
0.6116
1.1106
1.799
1.1108
3.392
0.6127
0.6124
0.5100
0.6102
3.991
2.891
0.5111
2.388
3.968
1.190
0.6100
0.6127
0.5100
2.292
0.5127
1.792
2.292
0.6125
0.6127
0.599
4.576
0.5108
1.196
0.6108
0.5108
0.5100
0.699
0.5111
0.6102
0.6100
0.5100
0.5108
2.392
2.292
0.5100
0.6120
2.292
1.296
0.675
2.292
0.6100
1.788
0.696
1.191
3.972
2.888
1.792
1.791
1.780
0.696
1.690
3.970
5.076
3.976
1.188
0.690
0.692
1.192
0.692
0.692
1.192
1.790
3.966
0.590
1.788
2.876
2.788
1.190
2.888
1.192
1.292
1.191
1.191
1.192
3.970
0.596
0.592
0.592
2.878
0.590
0.692
3.479
0.688
1.188
3.376
5.651
0.690
0.690
0.590
0.592
0.591
0.688
2.876
1.190
0.691
1.190
0.690
0.687
0.590
0.690
2.378
2.776
1.188

Compared With Other Events

Station records per event
Station records in Heat wave in United States and Mexico, 26 March to 17 April 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 2021 (this event)3,669 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, 24 October to 17 November 20223,289 records

Every Record Set

20 of 3,669
Every record set or tied during Heat wave in United States and Mexico, 26 March to 17 April 2021, in date order
DateStationRecordValueMarginYears stoodSignificance
2021-04-04Castle RockRecord high minimum temperature12.2 C (54.0 F)6.6 C (11.9 F)9251 of 100 (Notable)
2021-04-05PrimgharRecord high minimum temperature13.9 C (57.0 F)4.5 C (8.1 F)12548 of 100 (Notable)
2021-04-06Spirit LakeRecord high maximum temperature28.3 C (82.9 F)5.5 C (9.9 F)12047 of 100 (Notable)
2021-04-06Hayward RsRecord high maximum temperature28.9 C (84.0 F)5.0 C (9.0 F)12047 of 100 (Notable)
2021-04-06ParadiseRecord high minimum temperature13.3 C (55.9 F)2.7 C (4.9 F)10246 of 100 (Notable)
2021-04-07Bergland DamRecord high minimum temperature5.6 C (42.1 F)3.9 C (7.0 F)9946 of 100 (Notable)
2021-04-07Stambaugh 2SSERecord high minimum temperature9.4 C (48.9 F)5.0 C (9.0 F)9646 of 100 (Notable)
2021-04-08FriendshipRecord high minimum temperature13.3 C (55.9 F)10.5 C (18.9 F)8755 of 100 (Notable)
2021-04-08RhinelanderRecord high minimum temperature11.1 C (52.0 F)6.7 C (12.1 F)11152 of 100 (Notable)
2021-04-08Onaway 4NRecord high minimum temperature12.8 C (55.0 F)6.7 C (12.1 F)9049 of 100 (Notable)
2021-04-08PostvilleRecord high minimum temperature13.3 C (55.9 F)3.9 C (7.0 F)11147 of 100 (Notable)
2021-04-09CharlevoixRecord high maximum temperature28.3 C (82.9 F)12.7 C (22.9 F)11659 of 100 (Notable)
2021-04-09CharlevoixRecord high minimum temperature8.3 C (46.9 F)3.9 C (7.0 F)10249 of 100 (Notable)
2021-04-09Bergland DamRecord high minimum temperature7.2 C (45.0 F)3.9 C (7.0 F)10247 of 100 (Notable)
2021-04-09Detour VillageRecord high minimum temperature5.0 C (41.0 F)2.8 C (5.0 F)11947 of 100 (Notable)
2021-04-09GaylordRecord high minimum temperature10.0 C (50.0 F)4.4 C (7.9 F)10647 of 100 (Notable)
2021-04-09PetoskeyRecord high maximum temperature27.8 C (82.0 F)6.7 C (12.1 F)9047 of 100 (Notable)
2021-04-09Dunkirk Chautauqua Co APRecord high minimum temperature15.6 C (60.1 F)8.4 C (15.1 F)6846 of 100 (Notable)
2021-04-11RidgwayRecord high minimum temperature11.7 C (53.1 F)3.9 C (7.0 F)10247 of 100 (Notable)
2021-04-13ParadiseRecord high minimum temperature15.0 C (59.0 F)3.3 C (5.9 F)9245 of 100 (Notable)

The daily ledgers keep a limited number of records per day, so this list has 20 of the 3,669 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.