Heat wave in United States, 7 to 23 April 2023

Name: Heat wave in United States, 7 to 23 April 2023
Start: 2023-04-07
End: 2023-04-23
Location: United States

Heat wave in United States, 7 to 23 April 2023: 2,963 records at 1,535 stations, peak on 13 April 2023. Closed.

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

Key Facts

Heat wave in United States, 7 to 23 April 2023 set or tied 2,963 station records at 1,535 stations.
It ran from 7 April 2023 to 23 April 2023 (17 days) and its peak day was 13 April 2023.
Status: closed.
Charlevoix set a daily record high minimum temperature of 11.1 C (52.0 F) on 11 April 2023.
The busiest day was 13 April 2023 with 631 records.
The oldest broken record in the ranked list had stood for 132 years.

Footprint

7 to 23 April 2023

The area covered by Heat wave in United States, 7 to 23 April 2023 is outlined, with 19 of the stations that set records marked, coloured by record type. Made with Natural Earth.

Footprint of Heat wave in United States, 7 to 23 April 2023: stations that set records in the event
Station	Type	Value	Date
Charlevoix	Record high minimum temperature	11.1 C (52.0 F)	2023-04-11
Ola	Record high minimum temperature	11.1 C (52.0 F)	2023-04-11
Fillmore	Record high minimum temperature	15.6 C (60.1 F)	2023-04-12
Greenville Muni AP	Record high minimum temperature	7.2 C (45.0 F)	2023-04-11
Laguardia AP	Record high minimum temperature	18.9 C (66.0 F)	2023-04-12
World Trade Ctr	Record high minimum temperature	19.4 C (66.9 F)	2023-04-13
Caledonia	Record high maximum temperature	30.0 C (86.0 F)	2023-04-13
Kewaunee	Record high maximum temperature	27.8 C (82.0 F)	2023-04-14
Choteau	Record high minimum temperature	8.9 C (48.0 F)	2023-04-10
Shawano 2SSW	Record high minimum temperature	13.9 C (57.0 F)	2023-04-13
Waupaca	Record high maximum temperature	31.1 C (88.0 F)	2023-04-13
Hyannis	Record high minimum temperature	13.3 C (55.9 F)	2023-04-14
Blue Hill Coop	Record high maximum temperature	31.1 C (88.0 F)	2023-04-15
Spirit Lake	Record high maximum temperature	27.2 C (81.0 F)	2023-04-11
Castle Rock	Record high maximum temperature	28.9 C (84.0 F)	2023-04-12
Decorah	Record high maximum temperature	30.6 C (87.1 F)	2023-04-12
Le Mars	Record high maximum temperature	33.3 C (91.9 F)	2023-04-13
Sibley	Record high maximum temperature	31.7 C (89.1 F)	2023-04-13
Newberry-Luce Co Rd Commission	Record high maximum temperature	24.4 C (75.9 F)	2023-04-14

Records per Day

Peak day 631

Records set or tied each day from 7 April 2023 to 23 April 2023. The most in one day was 631 on 13 April 2023.

Records per day during Heat wave in United States, 7 to 23 April 2023
Date	Records
2023-04-07	2
2023-04-08	4
2023-04-09	40
2023-04-10	333
2023-04-11	495
2023-04-12	596
2023-04-13	631
2023-04-14	464
2023-04-15	229
2023-04-16	67
2023-04-17	14
2023-04-18	5
2023-04-20	10
2023-04-21	48
2023-04-22	24
2023-04-23	1

Top Records by Margin

Margin over the record replaced

Top records of Heat wave in United States, 7 to 23 April 2023 ranked by margin
Kewaunee, 04-14	7.2 C (13.0 F)
Charlevoix, 04-11	6.7 C (12.1 F)
Laguardia AP, 04-12	6.7 C (12.1 F)
Fillmore, 04-12	5.6 C (10.1 F)
Ola, 04-11	5.0 C (9.0 F)
Caledonia, 04-13	5.0 C (9.0 F)
Waupaca, 04-13	4.4 C (7.9 F)
Greenville Muni AP, 04-11	3.9 C (7.0 F)
Blue Hill Coop, 04-15	3.9 C (7.0 F)
Le Mars, 04-13	3.9 C (7.0 F)
Sibley, 04-13	3.9 C (7.0 F)
Spirit Lake, 04-11	3.9 C (7.0 F)
Decorah, 04-12	3.4 C (6.1 F)
Choteau, 04-10	3.3 C (5.9 F)
Shawano 2SSW, 04-13	3.3 C (5.9 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

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, 7 to 23 April 2023
Margin (C)	Years the old record stood
6.7	104
5.0	123
5.6	114
3.9	100
0.5	94
6.7	77
5.0	123
7.2	81
3.9	126
2.2	113
3.3	125
3.3	126
4.4	123
3.3	123
3.4	106
3.9	114
3.9	114
3.9	127
2.2	101
3.3	112
5.0	92
2.2	123
3.9	114
3.9	123
5.0	77
3.9	114
3.9	106
7.8	73
2.7	114
2.7	123
3.3	123
6.1	81
2.2	123
7.2	81
3.9	92
4.4	84
3.3	114
3.4	114
1.7	108
3.4	126
6.1	92
3.3	90
5.0	92
2.7	123
2.8	123
2.8	123
5.0	92
3.3	114
5.0	92
1.7	108
2.2	123
2.3	114
2.8	123
2.2	127
1.6	98
2.2	124
2.2	123
2.3	114
3.4	97
1.6	126
6.1	77
6.1	77
2.7	114
5.0	92
2.7	126
2.8	108
2.7	106
1.6	108
3.9	77
2.2	112
1.7	132
2.2	126
2.3	126
5.0	92
5.0	92
2.2	114
2.2	123
2.2	114
2.2	123
2.2	97
1.6	132
1.7	128
1.1	127
1.1	108
5.6	84
1.1	97
1.1	112
1.7	120
1.6	114
1.7	106
2.8	97
1.7	114
2.8	92
1.7	114
2.8	89
4.5	84
1.1	112
4.5	77
1.6	114
4.4	76
2.2	86
1.6	114
1.1	109
1.1	126
1.6	126
1.1	113
1.6	126
1.1	101
1.7	97
3.9	92
1.6	114
1.6	123
3.3	92
1.7	114
1.7	114
3.9	92
0.5	106
1.1	118
1.1	114
1.1	123
3.9	88
0.6	118
1.1	120
3.4	92
2.8	92
3.4	92
1.1	114
0.6	126
2.8	92
1.1	126
2.2	92
2.8	92
1.2	114
5.0	84
1.1	112
1.1	97
3.4	92
1.1	114
1.2	114
1.1	114
6.1	68
3.9	84
0.5	126
1.1	126
1.1	126
0.6	125
3.3	77
1.1	114
1.1	114
0.6	112
0.5	123
0.6	112
3.9	92
0.6	112
2.8	92
5.0	81
1.1	114
2.8	92
1.1	123
4.5	81
1.1	114
0.6	109
0.6	106
7.8	73
5.0	77
3.4	92
3.3	92
2.8	84
1.1	97
3.3	77
2.2	92
0.5	118
1.7	90
2.2	84
0.6	97
0.5	123
0.6	126
2.8	92
0.6	106
0.5	114
2.2	92
2.8	92
2.3	92
2.2	92
2.3	92
0.6	106
2.3	92
0.5	114
1.1	97
7.7	46
0.6	126
7.8	62
2.3	92
0.5	126
2.8	92
0.6	114
0.6	114
1.1	97
1.1	97
0.5	109

Compared With Other Events

Station records per event

Station records in Heat wave in United States, 7 to 23 April 2023 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 United States, 7 to 23 April 2023 (this event)	2,963 records

Every Record Set

20 of 2,963

Every record set or tied during Heat wave in United States, 7 to 23 April 2023, in date order
Date	Station	Record	Value	Margin	Years stood	Significance
2023-04-10	Choteau	Record high minimum temperature	8.9 C (48.0 F)	3.3 C (5.9 F)	125	46 of 100 (Notable)
2023-04-11	Charlevoix	Record high minimum temperature	11.1 C (52.0 F)	6.7 C (12.1 F)	104	57 of 100 (Notable)
2023-04-11	Ola	Record high minimum temperature	11.1 C (52.0 F)	5.0 C (9.0 F)	123	54 of 100 (Notable)
2023-04-11	Greenville Muni AP	Record high minimum temperature	7.2 C (45.0 F)	3.9 C (7.0 F)	100	49 of 100 (Notable)
2023-04-11	Spirit Lake	Record high maximum temperature	27.2 C (81.0 F)	3.9 C (7.0 F)	127	45 of 100 (Notable)
2023-04-12	Fillmore	Record high minimum temperature	15.6 C (60.1 F)	5.6 C (10.1 F)	114	52 of 100 (Notable)
2023-04-12	Laguardia AP	Record high minimum temperature	18.9 C (66.0 F)	6.7 C (12.1 F)	77	49 of 100 (Notable)
2023-04-12	Castle Rock	Record high maximum temperature	28.9 C (84.0 F)	3.3 C (5.9 F)	123	45 of 100 (Notable)
2023-04-12	Decorah	Record high maximum temperature	30.6 C (87.1 F)	3.4 C (6.1 F)	106	45 of 100 (Notable)
2023-04-13	World Trade Ctr	Record high minimum temperature	19.4 C (66.9 F)	0.5 C (0.9 F)	94	49 of 100 (Notable)
2023-04-13	Caledonia	Record high maximum temperature	30.0 C (86.0 F)	5.0 C (9.0 F)	123	47 of 100 (Notable)
2023-04-13	Shawano 2SSW	Record high minimum temperature	13.9 C (57.0 F)	3.3 C (5.9 F)	126	46 of 100 (Notable)
2023-04-13	Waupaca	Record high maximum temperature	31.1 C (88.0 F)	4.4 C (7.9 F)	123	46 of 100 (Notable)
2023-04-13	Le Mars	Record high maximum temperature	33.3 C (91.9 F)	3.9 C (7.0 F)	114	45 of 100 (Notable)
2023-04-13	Sibley	Record high maximum temperature	31.7 C (89.1 F)	3.9 C (7.0 F)	114	45 of 100 (Notable)
2023-04-14	Kewaunee	Record high maximum temperature	27.8 C (82.0 F)	7.2 C (13.0 F)	81	47 of 100 (Notable)
2023-04-14	Hyannis	Record high minimum temperature	13.3 C (55.9 F)	2.2 C (4.0 F)	113	46 of 100 (Notable)
2023-04-14	Newberry-Luce Co Rd Commission	Record high maximum temperature	24.4 C (75.9 F)	3.3 C (5.9 F)	112	45 of 100 (Notable)
2023-04-15	Blue Hill Coop	Record high maximum temperature	31.1 C (88.0 F)	3.9 C (7.0 F)	126	46 of 100 (Notable)
2023-04-16	Greenville Muni AP	Record high minimum temperature	6.1 C (43.0 F)	2.2 C (4.0 F)	101	45 of 100 (Notable)

The daily ledgers keep a limited number of records per day, so this list has 20 of the 2,963 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
6.7	104
5.0	123
5.6	114
3.9	100
0.5	94
6.7	77
5.0	123
7.2	81
3.9	126
2.2	113
3.3	125
3.3	126
4.4	123
3.3	123
3.4	106
3.9	114
3.9	114
3.9	127
2.2	101
3.3	112
5.0	92
2.2	123
3.9	114
3.9	123
5.0	77
3.9	114
3.9	106
7.8	73
2.7	114
2.7	123
3.3	123
6.1	81
2.2	123
7.2	81
3.9	92
4.4	84
3.3	114
3.4	114
1.7	108
3.4	126
6.1	92
3.3	90
5.0	92
2.7	123
2.8	123
2.8	123
5.0	92
3.3	114
5.0	92
1.7	108
2.2	123
2.3	114
2.8	123
2.2	127
1.6	98
2.2	124
2.2	123
2.3	114
3.4	97
1.6	126
6.1	77
6.1	77
2.7	114
5.0	92
2.7	126
2.8	108
2.7	106
1.6	108
3.9	77
2.2	112
1.7	132
2.2	126
2.3	126
5.0	92
5.0	92
2.2	114
2.2	123
2.2	114
2.2	123
2.2	97
1.6	132
1.7	128
1.1	127
1.1	108
5.6	84
1.1	97
1.1	112
1.7	120
1.6	114
1.7	106
2.8	97
1.7	114
2.8	92
1.7	114
2.8	89
4.5	84
1.1	112
4.5	77
1.6	114
4.4	76
2.2	86
1.6	114
1.1	109
1.1	126
1.6	126
1.1	113
1.6	126
1.1	101
1.7	97
3.9	92
1.6	114
1.6	123
3.3	92
1.7	114
1.7	114
3.9	92
0.5	106
1.1	118
1.1	114
1.1	123
3.9	88
0.6	118
1.1	120
3.4	92
2.8	92
3.4	92
1.1	114
0.6	126
2.8	92
1.1	126
2.2	92
2.8	92
1.2	114
5.0	84
1.1	112
1.1	97
3.4	92
1.1	114
1.2	114
1.1	114
6.1	68
3.9	84
0.5	126
1.1	126
1.1	126
0.6	125
3.3	77
1.1	114
1.1	114
0.6	112
0.5	123
0.6	112
3.9	92
0.6	112
2.8	92
5.0	81
1.1	114
2.8	92
1.1	123
4.5	81
1.1	114
0.6	109
0.6	106
7.8	73
5.0	77
3.4	92
3.3	92
2.8	84
1.1	97
3.3	77
2.2	92
0.5	118
1.7	90
2.2	84
0.6	97
0.5	123
0.6	126
2.8	92
0.6	106
0.5	114
2.2	92
2.8	92
2.3	92
2.2	92
2.3	92
0.6	106
2.3	92
0.5	114
1.1	97
7.7	46
0.6	126
7.8	62
2.3	92
0.5	126
2.8	92
0.6	114
0.6	114
1.1	97
1.1	97
0.5	109

Margin (C)	Years the old record stood
6.7	104
5.0	123
5.6	114
3.9	100
0.5	94
6.7	77
5.0	123
7.2	81
3.9	126
2.2	113
3.3	125
3.3	126
4.4	123
3.3	123
3.4	106
3.9	114
3.9	114
3.9	127
2.2	101
3.3	112
5.0	92
2.2	123
3.9	114
3.9	123
5.0	77
3.9	114
3.9	106
7.8	73
2.7	114
2.7	123
3.3	123
6.1	81
2.2	123
7.2	81
3.9	92
4.4	84
3.3	114
3.4	114
1.7	108
3.4	126
6.1	92
3.3	90
5.0	92
2.7	123
2.8	123
2.8	123
5.0	92
3.3	114
5.0	92
1.7	108
2.2	123
2.3	114
2.8	123
2.2	127
1.6	98
2.2	124
2.2	123
2.3	114
3.4	97
1.6	126
6.1	77
6.1	77
2.7	114
5.0	92
2.7	126
2.8	108
2.7	106
1.6	108
3.9	77
2.2	112
1.7	132
2.2	126
2.3	126
5.0	92
5.0	92
2.2	114
2.2	123
2.2	114
2.2	123
2.2	97
1.6	132
1.7	128
1.1	127
1.1	108
5.6	84
1.1	97
1.1	112
1.7	120
1.6	114
1.7	106
2.8	97
1.7	114
2.8	92
1.7	114
2.8	89
4.5	84
1.1	112
4.5	77
1.6	114
4.4	76
2.2	86
1.6	114
1.1	109
1.1	126
1.6	126
1.1	113
1.6	126
1.1	101
1.7	97
3.9	92
1.6	114
1.6	123
3.3	92
1.7	114
1.7	114
3.9	92
0.5	106
1.1	118
1.1	114
1.1	123
3.9	88
0.6	118
1.1	120
3.4	92
2.8	92
3.4	92
1.1	114
0.6	126
2.8	92
1.1	126
2.2	92
2.8	92
1.2	114
5.0	84
1.1	112
1.1	97
3.4	92
1.1	114
1.2	114
1.1	114
6.1	68
3.9	84
0.5	126
1.1	126
1.1	126
0.6	125
3.3	77
1.1	114
1.1	114
0.6	112
0.5	123
0.6	112
3.9	92
0.6	112
2.8	92
5.0	81
1.1	114
2.8	92
1.1	123
4.5	81
1.1	114
0.6	109
0.6	106
7.8	73
5.0	77
3.4	92
3.3	92
2.8	84
1.1	97
3.3	77
2.2	92
0.5	118
1.7	90
2.2	84
0.6	97
0.5	123
0.6	126
2.8	92
0.6	106
0.5	114
2.2	92
2.8	92
2.3	92
2.2	92
2.3	92
0.6	106
2.3	92
0.5	114
1.1	97
7.7	46
0.6	126
7.8	62
2.3	92
0.5	126
2.8	92
0.6	114
0.6	114
1.1	97
1.1	97
0.5	109