Daily records
Page built 2026-10-14
Data as of 2026-10-12
Search
Built 2026-10-14 (14 October 2026)

Heat wave in United States, 20 to 25 February 2021

Heat wave in United States, 20 to 25 February 2021: 100 records at 84 stations, peak on 23 February 2021. Closed.

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

Key Facts

  • Heat wave in United States, 20 to 25 February 2021 set or tied 100 station records at 84 stations.
  • It ran from 20 February 2021 to 25 February 2021 (6 days) and its peak day was 23 February 2021.
  • Status: closed.
  • Riverton set a monthly record high minimum temperature of 2.2 C (36.0 F) on 22 February 2021.
  • The busiest day was 23 February 2021 with 44 records.
  • The oldest broken record in the ranked list had stood for 125 years.

Footprint

20 to 25 February 2021
Footprint of Heat wave in United States, 20 to 25 February 2021 The area covered by Heat wave in United States, 20 to 25 February 2021 is outlined, with 19 of the stations that set records marked, coloured by record type.
The area covered by Heat wave in United States, 20 to 25 February 2021 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, 20 to 25 February 2021: stations that set records in the event
StationTypeValueDate
RivertonRecord high minimum temperature2.2 C (36.0 F)2021-02-22
LivermoreRecord high maximum temperature26.1 C (79.0 F)2021-02-23
Butte Bert Mooney APRecord high minimum temperature1.1 C (34.0 F)2021-02-22
San Rafael-Civic CtrRecord high maximum temperature28.3 C (82.9 F)2021-02-23
Huntley Exp STNRecord high minimum temperature2.8 C (37.0 F)2021-02-23
AlbertonRecord high minimum temperature5.6 C (42.1 F)2021-02-22
Glasgow #2Record high minimum temperature-0.6 C (30.9 F)2021-02-23
Colusa 2 SSWRecord high maximum temperature25.6 C (78.1 F)2021-02-24
Oakland Intl APRecord high maximum temperature24.4 C (75.9 F)2021-02-24
ChelanRecord high minimum temperature5.0 C (41.0 F)2021-02-22
MaxRecord high minimum temperature1.1 C (34.0 F)2021-02-23
Saco 1 NNWRecord high minimum temperature3.9 C (39.0 F)2021-02-22
Kenmare 1 WSWRecord high minimum temperature-1.1 C (30.0 F)2021-02-22
AberdeenRecord high maximum temperature15.6 C (60.1 F)2021-02-22
BismarckRecord high minimum temperature1.7 C (35.1 F)2021-02-22
GlasgowRecord high minimum temperature1.7 C (35.1 F)2021-02-22
HardinRecord high minimum temperature1.7 C (35.1 F)2021-02-23
W GlacierRecord high minimum temperature1.7 C (35.1 F)2021-02-23
KentfieldRecord high maximum temperature26.1 C (79.0 F)2021-02-23

Records per Day

Peak day 44
Records per day during Heat wave in United States, 20 to 25 February 2021 Records set or tied each day from 20 February 2021 to 25 February 2021. The most in one day was 44 on 23 February 2021. 0 13 25 38 50 02-2002-2102-2202-2302-2402-25
Records set or tied each day from 20 February 2021 to 25 February 2021. The most in one day was 44 on 23 February 2021.
Records per day during Heat wave in United States, 20 to 25 February 2021
DateRecords
2021-02-201
2021-02-216
2021-02-2240
2021-02-2344
2021-02-246
2021-02-253

Top Records by Margin

Margin over the record replaced
Top records of Heat wave in United States, 20 to 25 February 2021 ranked by margin
Chelan, 02-222.8 C (5.0 F)
Alberton, 02-232.8 C (5.0 F)
Kentfield, 02-232.2 C (4.0 F)
Livermore, 02-231.7 C (3.1 F)
Butte Bert Mooney AP, 02-221.7 C (3.1 F)
Bismarck, 02-221.7 C (3.1 F)
Glasgow, 02-221.7 C (3.1 F)
San Rafael-Civic Ctr, 02-231.6 C (2.9 F)
Alberton, 02-221.2 C (2.2 F)
Colusa 2 SSW, 02-241.2 C (2.2 F)
Huntley Exp STN, 02-231.1 C (2.0 F)
Oakland Intl AP, 02-241.1 C (2.0 F)
Saco 1 NNW, 02-221.1 C (2.0 F)
W Glacier, 02-231.1 C (2.0 F)
Hardin, 02-230.6 C (1.1 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, 20 to 25 February 2021 100 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 0.01.53.04.56.0 Margin (C) Years the old record stood
100 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, 20 to 25 February 2021
Margin (C)Years the old record stood
0.5114
1.7106
1.7125
1.657
1.1100
1.252
1.267
0.567
1.167
0.567
2.843
0.671
1.140
1.167
0.667
0.663
1.767
1.767
2.236
2.853
1.625
1.710
1.736
2.253
1.253
2.835
1.636
0.638
1.745
0.632
0.630
1.719
0.644
0.540
5.126
0.629
1.137
0.545
0.536
1.136
2.238
1.140
1.138
0.530
0.636
1.723
2.224
2.29
1.119
1.734
1.19
1.135
1.730
2.526
2.429
2.931
2.29
2.219
1.926
2.29
0.59
1.731
0.532
1.729
0.630
2.226
0.529
0.627
0.130
2.25
0.64
2.221
0.529
3.219
1.822
0.57
0.626
1.121
2.29
0.526
1.619
0.126
1.221
0.57
1.19
1.119
0.623
0.221
0.619
1.89
0.119
1.19
1.75
1.15
1.29
0.515
1.19
1.27
1.15
0.68

Compared With Other Events

Station records per event
Station records in Heat wave in United States, 20 to 25 February 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, 20 to 25 February 2021 (this event)100 records

Every Record Set

20 of 100
Every record set or tied during Heat wave in United States, 20 to 25 February 2021, in date order
DateStationRecordValueMarginYears stoodSignificance
2021-02-22RivertonRecord high minimum temperature2.2 C (36.0 F)0.5 C (0.9 F)11450 of 100 (Notable)
2021-02-22Butte Bert Mooney APRecord high minimum temperature1.1 C (34.0 F)1.7 C (3.1 F)12542 of 100 (Notable)
2021-02-22AlbertonRecord high minimum temperature5.6 C (42.1 F)1.2 C (2.2 F)5233 of 100 (Routine)
2021-02-22ChelanRecord high minimum temperature5.0 C (41.0 F)2.8 C (5.0 F)4329 of 100 (Routine)
2021-02-22Saco 1 NNWRecord high minimum temperature3.9 C (39.0 F)1.1 C (2.0 F)4028 of 100 (Routine)
2021-02-22Kenmare 1 WSWRecord high minimum temperature-1.1 C (30.0 F)0.6 C (1.1 F)6728 of 100 (Routine)
2021-02-22AberdeenRecord high maximum temperature15.6 C (60.1 F)0.6 C (1.1 F)6328 of 100 (Routine)
2021-02-22BismarckRecord high minimum temperature1.7 C (35.1 F)1.7 C (3.1 F)6728 of 100 (Routine)
2021-02-22GlasgowRecord high minimum temperature1.7 C (35.1 F)1.7 C (3.1 F)6728 of 100 (Routine)
2021-02-23LivermoreRecord high maximum temperature26.1 C (79.0 F)1.7 C (3.1 F)10644 of 100 (Notable)
2021-02-23San Rafael-Civic CtrRecord high maximum temperature28.3 C (82.9 F)1.6 C (2.9 F)5741 of 100 (Notable)
2021-02-23Huntley Exp STNRecord high minimum temperature2.8 C (37.0 F)1.1 C (2.0 F)10041 of 100 (Notable)
2021-02-23Glasgow #2Record high minimum temperature-0.6 C (30.9 F)0.5 C (0.9 F)6730 of 100 (Routine)
2021-02-23MaxRecord high minimum temperature1.1 C (34.0 F)0.5 C (0.9 F)6729 of 100 (Routine)
2021-02-23HardinRecord high minimum temperature1.7 C (35.1 F)0.6 C (1.1 F)7128 of 100 (Routine)
2021-02-23W GlacierRecord high minimum temperature1.7 C (35.1 F)1.1 C (2.0 F)6728 of 100 (Routine)
2021-02-23KentfieldRecord high maximum temperature26.1 C (79.0 F)2.2 C (4.0 F)3626 of 100 (Routine)
2021-02-23AlbertonRecord high minimum temperature3.9 C (39.0 F)2.8 C (5.0 F)5326 of 100 (Routine)
2021-02-24Colusa 2 SSWRecord high maximum temperature25.6 C (78.1 F)1.2 C (2.2 F)6730 of 100 (Routine)
2021-02-24Oakland Intl APRecord high maximum temperature24.4 C (75.9 F)1.1 C (2.0 F)6730 of 100 (Routine)

The daily ledgers keep a limited number of records per day, so this list has 20 of the 100 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.