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Built 2026-10-14 (14 October 2026)

Heat wave in United States, 16 to 28 April 2021

Heat wave in United States, 16 to 28 April 2021: 153 records at 60 stations, peak on 19 April 2021. Closed.

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

Key Facts

  • Heat wave in United States, 16 to 28 April 2021 set or tied 153 station records at 60 stations.
  • It ran from 16 April 2021 to 28 April 2021 (13 days) and its peak day was 19 April 2021.
  • Status: closed.
  • Craig set a daily record high maximum temperature of 19.4 C (66.9 F) on 19 April 2021.
  • The busiest day was 19 April 2021 with 48 records.
  • The oldest broken record in the ranked list had stood for 100 years.

Footprint

16 to 28 April 2021
Footprint of Heat wave in United States, 16 to 28 April 2021 The area covered by Heat wave in United States, 16 to 28 April 2021 is outlined, with 15 of the stations that set records marked, coloured by record type.
The area covered by Heat wave in United States, 16 to 28 April 2021 is outlined, with 15 of the stations that set records marked, coloured by record type. Made with Natural Earth.
Footprint of Heat wave in United States, 16 to 28 April 2021: stations that set records in the event
StationTypeValueDate
Ketchikan APRecord high maximum temperature22.2 C (72.0 F)2021-04-18
Talkeetna APRecord high maximum temperature18.3 C (64.9 F)2021-04-18
CraigRecord high maximum temperature19.4 C (66.9 F)2021-04-19
Cordova APRecord high maximum temperature21.7 C (71.1 F)2021-04-18
Haines APRecord high maximum temperature18.9 C (66.0 F)2021-04-18
Petersburg 1Record high maximum temperature20.0 C (68.0 F)2021-04-18
GustavusRecord high maximum temperature18.9 C (66.0 F)2021-04-19
Juneau APRecord high maximum temperature21.1 C (70.0 F)2021-04-17
McKinley ParkRecord high maximum temperature15.6 C (60.1 F)2021-04-20
Little Port WalterRecord high maximum temperature16.7 C (62.1 F)2021-04-19
SkagwayRecord high maximum temperature20.6 C (69.1 F)2021-04-19
Anchorage Merrill FldRecord high maximum temperature17.2 C (63.0 F)2021-04-19
Matanuska Exp FarmRecord high maximum temperature19.4 C (66.9 F)2021-04-20
Homer APRecord high maximum temperature15.0 C (59.0 F)2021-04-26
Annex CreekRecord high minimum temperature5.6 C (42.1 F)2021-04-21

Records per Day

Peak day 48
Records per day during Heat wave in United States, 16 to 28 April 2021 Records set or tied each day from 16 April 2021 to 28 April 2021. The most in one day was 48 on 19 April 2021. 0 13 25 38 50 04-1604-1804-2004-2204-2404-2604-28
Records set or tied each day from 16 April 2021 to 28 April 2021. The most in one day was 48 on 19 April 2021.
Records per day during Heat wave in United States, 16 to 28 April 2021
DateRecords
2021-04-164
2021-04-1710
2021-04-1833
2021-04-1948
2021-04-2021
2021-04-215
2021-04-227
2021-04-233
2021-04-247
2021-04-257
2021-04-265
2021-04-272
2021-04-281

Top Records by Margin

Margin over the record replaced
Top records of Heat wave in United States, 16 to 28 April 2021 ranked by margin
Cordova AP, 04-187.3 C (13.1 F)
Craig, 04-196.1 C (11.0 F)
Juneau AP, 04-175.5 C (9.9 F)
Petersburg 1, 04-185.0 C (9.0 F)
Little Port Walter, 04-194.5 C (8.1 F)
Ketchikan AP, 04-184.4 C (7.9 F)
Talkeetna AP, 04-183.9 C (7.0 F)
Gustavus, 04-193.9 C (7.0 F)
Haines AP, 04-183.9 C (7.0 F)
Talkeetna AP, 04-193.4 C (6.1 F)
Matanuska Exp Farm, 04-203.3 C (5.9 F)
Anchorage Merrill Fld, 04-193.3 C (5.9 F)
McKinley Park, 04-202.8 C (5.0 F)
Skagway, 04-182.8 C (5.0 F)
Ketchikan AP, 04-192.7 C (4.9 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, 16 to 28 April 2021 153 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 0.02.04.06.08.0 Margin (C) Years the old record stood
153 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, 16 to 28 April 2021
Margin (C)Years the old record stood
6.170
4.487
3.9100
7.356
3.495
3.980
3.984
2.787
5.068
5.568
2.895
4.554
2.384
3.370
1.784
3.370
2.868
1.180
0.584
1.264
0.580
5.643
2.270
5.524
0.570
5.027
0.570
3.843
3.354
3.354
1.167
1.764
1.668
2.854
5.028
3.428
2.256
1.156
0.560
2.836
1.154
4.522
0.656
2.351
1.643
5.022
3.427
0.643
2.822
2.831
2.828
1.736
2.228
2.822
4.522
3.34
1.622
0.811
0.636
0.643
1.631
3.322
1.232
1.722
1.724
0.415
3.90
1.728
2.822
0.528
2.28
1.728
2.218
0.638
2.70
2.70
5.08
0.631
5.00
1.77
1.127
0.531
3.40
2.87
2.218
0.514
0.631
3.322
2.922
1.122
0.528
1.123
1.124
1.618
1.212
2.27
1.123
1.827
0.930
2.314
1.123
1.122
0.618
1.722
1.128
1.18
0.616
1.10
1.16
3.34
0.527
0.522
2.714
0.230
1.10
0.64
1.68
1.116
1.214
3.40
0.618
1.024
1.022
0.622
0.58
0.50
0.614
0.523
1.24
0.67
0.522
0.512
0.611
1.116
1.212
1.114
0.68
2.86
2.20
1.14
2.20
1.14
0.88
0.64
0.54
0.512
1.10
0.54
0.54
0.50
0.56
0.50
0.60

Compared With Other Events

Station records per event
Station records in Heat wave in United States, 16 to 28 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 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, 16 to 28 April 2021 (this event)153 records

Every Record Set

20 of 153
Every record set or tied during Heat wave in United States, 16 to 28 April 2021, in date order
DateStationRecordValueMarginYears stoodSignificance
2021-04-17Juneau APRecord high maximum temperature21.1 C (70.0 F)5.5 C (9.9 F)6843 of 100 (Notable)
2021-04-18Ketchikan APRecord high maximum temperature22.2 C (72.0 F)4.4 C (7.9 F)8749 of 100 (Notable)
2021-04-18Talkeetna APRecord high maximum temperature18.3 C (64.9 F)3.9 C (7.0 F)10049 of 100 (Notable)
2021-04-18Cordova APRecord high maximum temperature21.7 C (71.1 F)7.3 C (13.1 F)5647 of 100 (Notable)
2021-04-18Haines APRecord high maximum temperature18.9 C (66.0 F)3.9 C (7.0 F)8444 of 100 (Notable)
2021-04-18Petersburg 1Record high maximum temperature20.0 C (68.0 F)5.0 C (9.0 F)6844 of 100 (Notable)
2021-04-18SkagwayRecord high maximum temperature20.0 C (68.0 F)2.8 C (5.0 F)6837 of 100 (Notable)
2021-04-19CraigRecord high maximum temperature19.4 C (66.9 F)6.1 C (11.0 F)7049 of 100 (Notable)
2021-04-19Talkeetna APRecord high maximum temperature17.8 C (64.0 F)3.4 C (6.1 F)9546 of 100 (Notable)
2021-04-19GustavusRecord high maximum temperature18.9 C (66.0 F)3.9 C (7.0 F)8044 of 100 (Notable)
2021-04-19Ketchikan APRecord high maximum temperature19.4 C (66.9 F)2.7 C (4.9 F)8744 of 100 (Notable)
2021-04-19Little Port WalterRecord high maximum temperature16.7 C (62.1 F)4.5 C (8.1 F)5441 of 100 (Notable)
2021-04-19SkagwayRecord high maximum temperature20.6 C (69.1 F)2.3 C (4.1 F)8440 of 100 (Notable)
2021-04-19Anchorage Merrill FldRecord high maximum temperature17.2 C (63.0 F)3.3 C (5.9 F)7039 of 100 (Notable)
2021-04-20McKinley ParkRecord high maximum temperature15.6 C (60.1 F)2.8 C (5.0 F)9542 of 100 (Notable)
2021-04-20Matanuska Exp FarmRecord high maximum temperature19.4 C (66.9 F)3.3 C (5.9 F)7039 of 100 (Notable)
2021-04-20SkagwayRecord high maximum temperature18.3 C (64.9 F)0.5 C (0.9 F)8436 of 100 (Notable)
2021-04-21Annex CreekRecord high minimum temperature5.6 C (42.1 F)1.2 C (2.2 F)6434 of 100 (Routine)
2021-04-24Matanuska Exp FarmRecord high maximum temperature17.2 C (63.0 F)1.1 C (2.0 F)8036 of 100 (Notable)
2021-04-26Homer APRecord high maximum temperature15.0 C (59.0 F)1.7 C (3.1 F)8439 of 100 (Notable)

The daily ledgers keep a limited number of records per day, so this list has 20 of the 153 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.