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Built 2026-11-13 (13 November 2026)

Cold outbreak in United States, 15 to 23 September 2026

Cold outbreak in United States, 15 to 23 September 2026: 20 records at 12 stations, peak on 20 September 2026. Closed.

Data as of . Last revised (2026-11-12).

Key Facts

  • Cold outbreak in United States, 15 to 23 September 2026 set or tied 20 station records at 12 stations.
  • It ran from 15 September 2026 to 23 September 2026 (9 days) and its peak day was 20 September 2026.
  • Status: closed.
  • Sonora set a monthly record low minimum temperature of 1.1 C (34.0 F) on 16 September 2026 (provisional).
  • The busiest day was 20 September 2026 with 8 records.
  • The oldest broken record in the ranked list had stood for 105 years.

Footprint

15 to 23 September 2026
Footprint of Cold outbreak in United States, 15 to 23 September 2026 The area covered by Cold outbreak in United States, 15 to 23 September 2026 is outlined, with 12 of the stations that set records marked, coloured by record type.
The area covered by Cold outbreak in United States, 15 to 23 September 2026 is outlined, with 12 of the stations that set records marked, coloured by record type. Made with Natural Earth.
Footprint of Cold outbreak in United States, 15 to 23 September 2026: stations that set records in the event
StationTypeValueDate
SonoraRecord low minimum temperature1.1 C (34.0 F)2026-09-16
Friant Government CampRecord low minimum temperature4.4 C (39.9 F)2026-09-23
Tracy CarbonaRecord low minimum temperature5.6 C (42.1 F)2026-09-16
Shasta DamRecord low minimum temperature8.9 C (48.0 F)2026-09-17
Markley CoveRecord low minimum temperature5.6 C (42.1 F)2026-09-18
La Honda CaliforniaRecord low maximum temperature15.6 C (60.1 F)2026-09-20
Oakland MuseumRecord low maximum temperature17.8 C (64.0 F)2026-09-21
MontereyRecord low maximum temperature16.1 C (61.0 F)2026-09-20
Monterey Peninsul APRecord low maximum temperature16.7 C (62.1 F)2026-09-20
Montague Siskiyou APRecord low minimum temperature2.2 C (36.0 F)2026-09-15
Briones CaliforniaRecord low maximum temperature19.4 C (66.9 F)2026-09-20
San JoseRecord low maximum temperature20.0 C (68.0 F)2026-09-20
Corralitos CaliforniaRecord low maximum temperature18.9 C (66.0 F)2026-09-20
Oakland North CaliforniaRecord low maximum temperature14.4 C (57.9 F)2026-09-21
Oakland Intl APRecord low maximum temperature17.8 C (64.0 F)2026-09-20
Las Tablas CaliforniaRecord low maximum temperature24.4 C (75.9 F)2026-09-17
Redwood CityRecord low maximum temperature20.6 C (69.1 F)2026-09-20
Oakland South CaliforniaRecord low maximum temperature17.2 C (63.0 F)2026-09-20

Records per Day

Peak day 8
Records per day during Cold outbreak in United States, 15 to 23 September 2026 Records set or tied each day from 15 September 2026 to 23 September 2026. The most in one day was 8 on 20 September 2026. 0 2 4 6 8 09-1509-1609-1709-1809-1909-2009-2109-23
Records set or tied each day from 15 September 2026 to 23 September 2026. The most in one day was 8 on 20 September 2026.
Records per day during Cold outbreak in United States, 15 to 23 September 2026
DateRecords
2026-09-151
2026-09-161
2026-09-172
2026-09-182
2026-09-191
2026-09-208
2026-09-214
2026-09-231

Top Records by Margin

Margin over the record replaced
Top records of Cold outbreak in United States, 15 to 23 September 2026 ranked by margin
La Honda California, 09-202.2 C (4.0 F)
Markley Cove, 09-171.6 C (2.9 F)
Friant Government Camp, 09-231.2 C (2.2 F)
Briones California, 09-201.2 C (2.2 F)
Oakland North California, 09-211.2 C (2.2 F)
Markley Cove, 09-181.1 C (2.0 F)
Oakland Museum, 09-201.1 C (2.0 F)
Montague Siskiyou AP, 09-151.1 C (2.0 F)
Oakland North California, 09-201.1 C (2.0 F)
Sonora, 09-160.6 C (1.1 F)
Sonora, 09-190.6 C (1.1 F)
Monterey, 09-200.6 C (1.1 F)
Las Tablas California, 09-170.6 C (1.1 F)
Sonora, 09-200.5 C (0.9 F)
Markley Cove, 09-210.5 C (0.9 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 Cold outbreak in United States, 15 to 23 September 2026 20 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 0.00.61.31.92.5 Margin (C) Years the old record stood
20 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, 15 to 23 September 2026
Margin (C)Years the old record stood
0.6105
1.280
0.660
0.556
1.140
0.548
0.50
0.537
0.521
2.236
0.624
1.124
0.524
1.18
1.61
1.217
0.520
1.212
1.18
0.63

Compared With Other Events

Station records per event
Station records in Cold outbreak in United States, 15 to 23 September 2026 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, 15 to 23 September 2026 (this event)20 records

Every Record Set

37 of 20
Every record set or tied during Cold outbreak in United States, 15 to 23 September 2026, in date order
DateStationRecordValueMarginYears stoodSignificance
2026-09-15Tracy CarbonaRecord low minimum temperature (provisional)7.2 C (45.0 F)0.6 C (1.1 F)5626 of 100 (Routine)
2026-09-15Montague Siskiyou APRecord low minimum temperature (provisional)2.2 C (36.0 F)1.1 C (2.0 F)812 of 100 (Routine)
2026-09-15Markley CoveRecord low minimum temperature (tie) (provisional)7.2 C (45.0 F)tie565 of 100 (Routine)
2026-09-16SonoraRecord low minimum temperature (provisional)1.1 C (34.0 F)0.6 C (1.1 F)10551 of 100 (Notable)
2026-09-16Tracy CarbonaRecord low minimum temperature (provisional)5.6 C (42.1 F)2.2 C (4.0 F)6534 of 100 (Routine)
2026-09-16Markley CoveRecord low minimum temperature (tie) (provisional)8.3 C (46.9 F)tie202 of 100 (Routine)
2026-09-16Briones CaliforniaRecord low maximum temperature (tie) (provisional)17.8 C (64.0 F)tie242 of 100 (Routine)
2026-09-17Shasta DamRecord low minimum temperature (provisional)8.9 C (48.0 F)1.1 C (2.0 F)4825 of 100 (Routine)
2026-09-17Markley CoveRecord low minimum temperature (provisional)5.6 C (42.1 F)1.6 C (2.9 F)111 of 100 (Routine)
2026-09-17SonoraRecord low minimum temperature (tie) (provisional)1.1 C (34.0 F)tie05 of 100 (Routine)
2026-09-17Las Tablas CaliforniaRecord low maximum temperature (provisional)24.4 C (75.9 F)0.6 C (1.1 F)34 of 100 (Routine)
2026-09-18Tracy CarbonaRecord low minimum temperature (provisional)5.0 C (41.0 F)2.2 C (4.0 F)6033 of 100 (Routine)
2026-09-18Markley CoveRecord low minimum temperature (provisional)5.6 C (42.1 F)1.1 C (2.0 F)4021 of 100 (Routine)
2026-09-18SonoraRecord low minimum temperature (provisional)0.6 C (33.1 F)0.5 C (0.9 F)021 of 100 (Routine)
2026-09-19SonoraRecord low minimum temperature (provisional)2.2 C (36.0 F)0.6 C (1.1 F)6029 of 100 (Routine)
2026-09-19Tracy CarbonaRecord low minimum temperature (provisional)5.6 C (42.1 F)0.5 C (0.9 F)710 of 100 (Routine)
2026-09-20SonoraRecord low minimum temperature (provisional)2.8 C (37.0 F)0.5 C (0.9 F)5627 of 100 (Routine)
2026-09-20La Honda CaliforniaRecord low maximum temperature (provisional)15.6 C (60.1 F)2.2 C (4.0 F)3617 of 100 (Routine)
2026-09-20MontereyRecord low maximum temperature (provisional)16.1 C (61.0 F)0.6 C (1.1 F)2416 of 100 (Routine)
2026-09-20Oakland MuseumRecord low maximum temperature (provisional)17.8 C (64.0 F)1.1 C (2.0 F)2414 of 100 (Routine)
2026-09-20Monterey Peninsul APRecord low maximum temperature (provisional)16.7 C (62.1 F)0.5 C (0.9 F)2413 of 100 (Routine)
2026-09-20San JoseRecord low maximum temperature (tie) (provisional)20.0 C (68.0 F)tie13210 of 100 (Routine)
2026-09-20Briones CaliforniaRecord low maximum temperature (provisional)19.4 C (66.9 F)1.2 C (2.2 F)1710 of 100 (Routine)
2026-09-20Corralitos CaliforniaRecord low maximum temperature (provisional)18.9 C (66.0 F)0.5 C (0.9 F)209 of 100 (Routine)
2026-09-20Oakland Intl APRecord low maximum temperature (tie) (provisional)17.8 C (64.0 F)tie727 of 100 (Routine)
2026-09-20Oakland North CaliforniaRecord low maximum temperature (provisional)16.7 C (62.1 F)1.1 C (2.0 F)86 of 100 (Routine)
2026-09-20Redwood CityRecord low maximum temperature (tie) (provisional)20.6 C (69.1 F)tie163 of 100 (Routine)
2026-09-20Tracy CarbonaRecord low minimum temperature (tie) (provisional)6.7 C (44.1 F)tie72 of 100 (Routine)
2026-09-20Oakland South CaliforniaRecord low maximum temperature (tie) (provisional)17.2 C (63.0 F)tie81 of 100 (Routine)
2026-09-21Markley CoveRecord low minimum temperature (provisional)6.7 C (44.1 F)0.5 C (0.9 F)4821 of 100 (Routine)
2026-09-21Oakland MuseumRecord low maximum temperature (provisional)17.8 C (64.0 F)0.5 C (0.9 F)3717 of 100 (Routine)
2026-09-21SonoraRecord low minimum temperature (provisional)2.8 C (37.0 F)0.5 C (0.9 F)2117 of 100 (Routine)
2026-09-21Oakland North CaliforniaRecord low maximum temperature (provisional)14.4 C (57.9 F)1.2 C (2.2 F)128 of 100 (Routine)
2026-09-22Oakland MuseumRecord low maximum temperature (tie) (provisional)18.3 C (64.9 F)tie525 of 100 (Routine)
2026-09-22SonoraRecord low minimum temperature (tie) (provisional)2.8 C (37.0 F)tie93 of 100 (Routine)
2026-09-23Friant Government CampRecord low minimum temperature (provisional)4.4 C (39.9 F)1.2 C (2.2 F)8035 of 100 (Notable)
2026-09-23Tracy CarbonaRecord low minimum temperature (provisional)4.4 C (39.9 F)2.3 C (4.1 F)817 of 100 (Routine)

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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 2026-11-12. Events are found by this site from station records and are not official designations. Records are provisional until reprocessed.