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Built 2026-10-19 (19 October 2026)

Cold outbreak in United States, 14 to 25 September 2021

Cold outbreak in United States, 14 to 25 September 2021: 169 records at 146 stations, peak on 16 September 2021. Closed.

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

Key Facts

  • Cold outbreak in United States, 14 to 25 September 2021 set or tied 169 station records at 146 stations.
  • It ran from 14 September 2021 to 25 September 2021 (12 days) and its peak day was 16 September 2021.
  • Status: closed.
  • San Francisco Oceanside set a daily record low minimum temperature of 3.9 C (39.0 F) on 19 September 2021.
  • The busiest day was 16 September 2021 with 55 records.
  • The oldest broken record in the ranked list had stood for 119 years.

Footprint

14 to 25 September 2021
Footprint of Cold outbreak in United States, 14 to 25 September 2021 The area covered by Cold outbreak in United States, 14 to 25 September 2021 is outlined, with 18 of the stations that set records marked, coloured by record type.
The area covered by Cold outbreak in United States, 14 to 25 September 2021 is outlined, with 18 of the stations that set records marked, coloured by record type. Made with Natural Earth.
Footprint of Cold outbreak in United States, 14 to 25 September 2021: stations that set records in the event
StationTypeValueDate
San Francisco OceansideRecord low minimum temperature3.9 C (39.0 F)2021-09-19
WallaceRecord low minimum temperature2.8 C (37.0 F)2021-09-22
Vancouver 4 NNERecord low minimum temperature1.7 C (35.1 F)2021-09-16
CallaoRecord low minimum temperature-6.7 C (19.9 F)2021-09-22
WilburRecord low maximum temperature12.8 C (55.0 F)2021-09-19
Carrizo Springs 3SRecord low minimum temperature8.9 C (48.0 F)2021-09-23
El CampoRecord low minimum temperature13.9 C (57.0 F)2021-09-24
LongviewRecord low minimum temperature2.2 C (36.0 F)2021-09-16
Leaburg 1 SWRecord low minimum temperature2.2 C (36.0 F)2021-09-19
Cascade LocksRecord low minimum temperature4.4 C (39.9 F)2021-09-17
Tipton 4S MesonetRecord low minimum temperature6.7 C (44.1 F)2021-09-22
WeslacoRecord low maximum temperature26.1 C (79.0 F)2021-09-23
EdenRecord low minimum temperature6.1 C (43.0 F)2021-09-24
Wise Rvr 3 WNWRecord low minimum temperature-7.8 C (18.0 F)2021-09-20
Wister 3SRecord low minimum temperature6.1 C (43.0 F)2021-09-24
Susanville 2SWRecord low minimum temperature-1.1 C (30.0 F)2021-09-16
Imperial Muni APRecord low minimum temperature0.0 C (32.0 F)2021-09-22
CalistogaRecord low maximum temperature18.9 C (66.0 F)2021-09-19

Records per Day

Peak day 55
Records per day during Cold outbreak in United States, 14 to 25 September 2021 Records set or tied each day from 14 September 2021 to 25 September 2021. The most in one day was 55 on 16 September 2021. 0 15 30 45 60 09-1409-1609-1809-2009-2209-24
Records set or tied each day from 14 September 2021 to 25 September 2021. The most in one day was 55 on 16 September 2021.
Records per day during Cold outbreak in United States, 14 to 25 September 2021
DateRecords
2021-09-142
2021-09-153
2021-09-1655
2021-09-1726
2021-09-189
2021-09-197
2021-09-2031
2021-09-217
2021-09-228
2021-09-237
2021-09-2410
2021-09-254

Top Records by Margin

Margin over the record replaced
Top records of Cold outbreak in United States, 14 to 25 September 2021 ranked by margin
San Francisco Oceanside, 09-196.1 C (11.0 F)
Calistoga, 09-193.3 C (5.9 F)
Carrizo Springs 3S, 09-232.2 C (4.0 F)
Callao, 09-221.7 C (3.1 F)
El Campo, 09-241.7 C (3.1 F)
Wallace, 09-221.1 C (2.0 F)
Wilbur, 09-191.1 C (2.0 F)
Longview, 09-161.1 C (2.0 F)
Eden, 09-241.1 C (2.0 F)
Leaburg 1 SW, 09-190.6 C (1.1 F)
Cascade Locks, 09-170.6 C (1.1 F)
Weslaco, 09-230.6 C (1.1 F)
Wise Rvr 3 WNW, 09-200.6 C (1.1 F)
Wister 3S, 09-240.6 C (1.1 F)
El Campo, 09-250.6 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 Cold outbreak in United States, 14 to 25 September 2021 169 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 30 60 90 120 0.02.04.06.08.0 Margin (C) Years the old record stood
169 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 Cold outbreak in United States, 14 to 25 September 2021
Margin (C)Years the old record stood
6.159
1.1108
0.5119
1.756
2.267
1.779
1.180
1.179
0.679
0.668
0.575
1.172
0.664
0.676
0.675
0.668
0.562
0.568
0.668
3.335
1.756
2.746
0.556
0.556
1.156
2.739
0.556
0.556
1.752
1.732
1.646
2.712
2.826
0.624
4.615
0.58
0.548
0.539
1.739
2.226
2.238
0.60
2.718
2.234
0.221
1.132
2.328
1.639
1.126
0.634
0.632
1.636
1.636
1.735
0.634
1.132
1.234
3.415
3.016
2.724
1.236
5.58
0.527
0.622
2.216
1.128
0.634
1.128
0.636
2.315
1.230
0.522
0.620
0.622
2.722
0.534
0.735
0.634
0.532
0.526
0.530
1.128
0.532
0.631
1.818
0.828
0.632
2.216
1.128
1.026
1.122
1.224
1.424
0.528
0.428
0.628
1.818
0.628
1.518
1.122
0.332
1.716
4.42
0.622
0.724
0.724
0.426
0.324
1.418
1.618
1.118
0.616
1.716
0.226
0.526
0.124
0.520
0.324
0.226
1.415
0.124
0.326
0.818
1.710
0.616
0.516
0.618
0.915
0.322
0.418
0.223
0.716
0.818
0.218
0.618
1.12
0.68
0.612
1.12
0.515
0.218
0.416
0.318
0.316
0.118
1.94
0.416
0.316
0.116
0.418
0.118
0.216
0.615
0.512
0.215
1.14
1.14
0.315
0.64
0.74
1.36
1.12
0.54
0.66
0.74
0.53
0.53
0.16
0.52

Compared With Other Events

Station records per event
Station records in Cold outbreak in United States, 14 to 25 September 2021 compared with similar events
Cold outbreak in United States and Mexico, 6 February to 5 March 202112,118 records
Cold outbreak in United States and Mexico, 13 October to 5 November 20209,841 records
Cold outbreak in United States and Mexico, 23 December 2017 to 8 January 20188,263 records
Cold outbreak in United States and Mexico, 3 to 23 January 20247,675 records
Cold outbreak in United States, 15 January to 10 February 20265,568 records
Cold outbreak in United States, 14 to 25 September 2021 (this event)169 records

Every Record Set

20 of 169
Every record set or tied during Cold outbreak in United States, 14 to 25 September 2021, in date order
DateStationRecordValueMarginYears stoodSignificance
2021-09-16Vancouver 4 NNERecord low minimum temperature1.7 C (35.1 F)0.5 C (0.9 F)11941 of 100 (Notable)
2021-09-16LongviewRecord low minimum temperature2.2 C (36.0 F)1.1 C (2.0 F)7935 of 100 (Notable)
2021-09-16Susanville 2SWRecord low minimum temperature-1.1 C (30.0 F)0.5 C (0.9 F)6229 of 100 (Routine)
2021-09-17Cascade LocksRecord low minimum temperature4.4 C (39.9 F)0.6 C (1.1 F)6832 of 100 (Routine)
2021-09-19San Francisco OceansideRecord low minimum temperature3.9 C (39.0 F)6.1 C (11.0 F)5955 of 100 (Notable)
2021-09-19WilburRecord low maximum temperature12.8 C (55.0 F)1.1 C (2.0 F)8036 of 100 (Notable)
2021-09-19Leaburg 1 SWRecord low minimum temperature2.2 C (36.0 F)0.6 C (1.1 F)7933 of 100 (Routine)
2021-09-19CalistogaRecord low maximum temperature18.9 C (66.0 F)3.3 C (5.9 F)3527 of 100 (Routine)
2021-09-20Wise Rvr 3 WNWRecord low minimum temperature-7.8 C (18.0 F)0.6 C (1.1 F)7630 of 100 (Routine)
2021-09-22WallaceRecord low minimum temperature2.8 C (37.0 F)1.1 C (2.0 F)10842 of 100 (Notable)
2021-09-22CallaoRecord low minimum temperature-6.7 C (19.9 F)1.7 C (3.1 F)5639 of 100 (Notable)
2021-09-22Tipton 4S MesonetRecord low minimum temperature6.7 C (44.1 F)0.5 C (0.9 F)7531 of 100 (Routine)
2021-09-22Imperial Muni APRecord low minimum temperature0.0 C (32.0 F)0.6 C (1.1 F)6828 of 100 (Routine)
2021-09-23Carrizo Springs 3SRecord low minimum temperature8.9 C (48.0 F)2.2 C (4.0 F)6736 of 100 (Notable)
2021-09-23WeslacoRecord low maximum temperature26.1 C (79.0 F)0.6 C (1.1 F)6431 of 100 (Routine)
2021-09-23El CampoRecord low minimum temperature13.9 C (57.0 F)0.5 C (0.9 F)6829 of 100 (Routine)
2021-09-24El CampoRecord low minimum temperature13.9 C (57.0 F)1.7 C (3.1 F)7936 of 100 (Notable)
2021-09-24EdenRecord low minimum temperature6.1 C (43.0 F)1.1 C (2.0 F)7231 of 100 (Routine)
2021-09-24Wister 3SRecord low minimum temperature6.1 C (43.0 F)0.6 C (1.1 F)7530 of 100 (Routine)
2021-09-25El CampoRecord low minimum temperature14.4 C (57.9 F)0.6 C (1.1 F)6830 of 100 (Routine)

The daily ledgers keep a limited number of records per day, so this list has 20 of the 169 records the event counts. The counts above use the full total.

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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.