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Built 2026-10-14 (14 October 2026)

County Line California Weather Records (USR0000CCOU)

Record envelope, standing records and threshold days for County Line California (USR0000CCOU), California, United States, with 30 years of record.

Key Facts for County Line California

  • County Line California (USR0000CCOU) is a weather station in California, United States at 39.02 latitude and -122.41 longitude, 636 m (2,085 ft) above sea level.
  • The station reports from 1994 to 2023, 30 years of record.
  • 1,464 records set at County Line California still stand.
  • Records are tracked for tmax, tmin: an element needs 30 years of data to be eligible.
  • County Line California tied a daily record high maximum temperature of 35.6 C (96.1 F) on 9 October 2026 (provisional).

Provisional Records

Records set in the last 60 days are provisional until they clear the revision window.

About the Station

  • Location: California, United States, 39.02 latitude, -122.41 longitude.
  • Elevation: 636 m (2,085 ft).
  • Period of record: 1994 to 2023, 30 years.
  • Eligible elements: tmax, tmin.

Daily Record Envelope and 2026

16 days at or beyond a record
Daily record high and record low at County Line California, with 2026 drawn through them The band shows the record high and record low for each calendar day at County Line California. The lines show the 2026 daily maximum and minimum. 16 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -200204060 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at County Line California. The lines show the 2026 daily maximum and minimum. 16 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at County Line California, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan29.4 C (84.9 F)-5.6 C (21.9 F)21.7 C (71.1 F)2.2 C (36.0 F)
Feb28.9 C (84.0 F)-3.3 C (26.1 F)23.9 C (75.0 F)-1.1 C (30.0 F)
Mar32.2 C (90.0 F)-4.4 C (24.1 F)32.2 C (90.0 F)5.6 C (42.1 F)
Apr35.6 C (96.1 F)-2.2 C (28.0 F)27.8 C (82.0 F)3.9 C (39.0 F)
May40.6 C (105.1 F)1.1 C (34.0 F)32.2 C (90.0 F)7.2 C (45.0 F)
Jun43.9 C (111.0 F)3.9 C (39.0 F)38.9 C (102.0 F)11.7 C (53.1 F)
Jul45.6 C (114.1 F)8.3 C (46.9 F)37.8 C (100.0 F)15.6 C (60.1 F)
Aug43.3 C (109.9 F)10.0 C (50.0 F)40.6 C (105.1 F)12.8 C (55.0 F)
Sep43.3 C (109.9 F)5.0 C (41.0 F)37.2 C (99.0 F)9.4 C (48.9 F)
Oct39.4 C (102.9 F)1.1 C (34.0 F)37.2 C (99.0 F)11.1 C (52.0 F)
Nov31.1 C (88.0 F)-1.7 C (28.9 F)n/an/a
Dec27.8 C (82.0 F)-7.2 C (19.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at County Line California by the year they were set 1,464 records at County Line California still stand. 1999 holds the most, with 68. 0204060801994: 201995: 511996: 381997: 371998: 571999: 682000: 612001: 492002: 422003: 482004: 482005: 262006: 472007: 462008: 682009: 562010: 372011: 542012: 582013: 562014: 452015: 422016: 202017: 492018: 272019: 492020: 422021: 412022: 552023: 322024: 392025: 302026: 26199419982002200620102014201820222026
1,464 records at County Line California still stand. 1999 holds the most, with 68.
Standing records at County Line California by the year they were set
Year setStanding records
199420
199551
199638
199737
199857
199968
200061
200149
200242
200348
200448
200526
200647
200746
200868
200956
201037
201154
201258
201356
201445
201542
201620
201749
201827
201949
202042
202141
202255
202332
202439
202530
202626

Period of Record Coverage

1994 to 2026
Days with data per year at County Line California 33 years of record at County Line California, 1994 to 2026. 4 years have data for under 90 percent of days and are left out of rankings: 1994, 1995, 2013, 2026. 1994: 62 of 365 days1995: 321 of 365 days1996: 365 of 366 days1997: 362 of 365 days1998: 365 of 365 days1999: 336 of 365 days2000: 366 of 366 days2001: 365 of 365 days2002: 337 of 365 days2003: 365 of 365 days2004: 366 of 366 days2005: 365 of 365 days2006: 365 of 365 days2007: 365 of 365 days2008: 365 of 366 days2009: 365 of 365 days2010: 365 of 365 days2011: 364 of 365 days2012: 333 of 366 days2013: 328 of 365 days2014: 364 of 365 days2015: 365 of 365 days2016: 364 of 366 days2017: 365 of 365 days2018: 365 of 365 days2019: 365 of 365 days2020: 365 of 366 days2021: 365 of 365 days2022: 364 of 365 days2023: 365 of 365 days2024: 366 of 366 days2025: 365 of 365 days2026: 284 of 365 days1995200020052010201520202025
33 years of record at County Line California, 1994 to 2026. 4 years have data for under 90 percent of days and are left out of rankings: 1994, 1995, 2013, 2026.
Days with data per year at County Line California
YearDays with dataShare of yearComplete
19946217%No
199532188%No
1996365100%Yes
199736299%Yes
1998365100%Yes
199933692%Yes
2000366100%Yes
2001365100%Yes
200233792%Yes
2003365100%Yes
2004366100%Yes
2005365100%Yes
2006365100%Yes
2007365100%Yes
2008365100%Yes
2009365100%Yes
2010365100%Yes
2011364100%Yes
201233391%Yes
201332890%No
2014364100%Yes
2015365100%Yes
201636499%Yes
2017365100%Yes
2018365100%Yes
2019365100%Yes
2020365100%Yes
2021365100%Yes
2022364100%Yes
2023365100%Yes
2024366100%Yes
2025365100%Yes
202628478%No

Latest Records

20
Latest records at County Line California
DateStationRecordValueBeat old record byOld record stoodSignificance
9 October 2026County Line California, USdaily high max (Tie, Provisional)35.6 C (96.1 F)tie29 years2 of 100 (Routine)
8 October 2026County Line California, USdaily high min (Provisional)24.4 C (75.9 F)2.2 C (4.0 F)4 years9 of 100 (Routine)
7 October 2026County Line California, USdaily high max (Provisional)36.1 C (97.0 F)0.5 C (0.9 F)29 years11 of 100 (Routine)
7 October 2026County Line California, USdaily high min (Tie, Provisional)24.4 C (75.9 F)tie1 year0 of 100 (Routine)
6 October 2026County Line California, USdaily high min (Provisional)25.0 C (77.0 F)1.1 C (2.0 F)1 year5 of 100 (Routine)
6 October 2026County Line California, USdaily high max (Provisional)36.7 C (98.1 F)1.1 C (2.0 F)1 year4 of 100 (Routine)
5 October 2026County Line California, USdaily high min (Provisional)25.6 C (78.1 F)2.8 C (5.0 F)12 years12 of 100 (Routine)
5 October 2026County Line California, USdaily high max (Provisional)37.2 C (99.0 F)1.1 C (2.0 F)1 year4 of 100 (Routine)
4 October 2026County Line California, USmonthly high min (Tie, Provisional)26.1 C (79.0 F)tie6 years3 of 100 (Routine)
3 October 2026County Line California, USdaily high min (Provisional)23.3 C (73.9 F)0.5 C (0.9 F)24 years11 of 100 (Routine)
13 September 2026County Line California, USdaily low min (Provisional)10.0 C (50.0 F)0.6 C (1.1 F)9 years6 of 100 (Routine)
3 September 2026County Line California, USdaily low max (Provisional)19.4 C (66.9 F)3.9 C (7.0 F)3 years10 of 100 (Routine)
15 August 2026County Line California, USdaily low max (Provisional)28.3 C (82.9 F)1.1 C (2.0 F)8 years8 of 100 (Routine)
14 August 2026County Line California, USdaily low max27.2 C (81.0 F)1.1 C (2.0 F)8 years8 of 100 (Routine)
9 August 2026County Line California, USdaily high min25.6 C (78.1 F)0.6 C (1.1 F)0 years4 of 100 (Routine)
8 August 2026County Line California, USdaily high min25.6 C (78.1 F)1.7 C (3.1 F)24 years14 of 100 (Routine)
15 June 2026County Line California, USdaily high max (Tie)38.9 C (102.0 F)tie19 years2 of 100 (Routine)
5 April 2026County Line California, USdaily high min13.9 C (57.0 F)1.1 C (2.0 F)19 years10 of 100 (Routine)
29 March 2026County Line California, USdaily high min17.2 C (63.0 F)3.3 C (5.9 F)24 years18 of 100 (Routine)
28 March 2026County Line California, USdaily high min15.0 C (59.0 F)1.7 C (3.1 F)8 years9 of 100 (Routine)

Climate Trend

26 complete years, 1996 to 2025
Annual mean temperature at County Line California as warming stripes, 1996 to 2025 One stripe for each of 26 complete years at County Line California, 1996 to 2025. Blue stripes are years cooler than the station's own mean of 16.8 C (62.2 F); red stripes are warmer. The coolest year was 1998, at 14.9 C (58.8 F), and the warmest was 2014, at 18.1 C (64.7 F). The strongest colour marks a difference of 1.9 C (3.4 F). 1996: 16.9 C, +0.1 C from the station mean1997: 16.6 C, -0.2 C from the station mean1998: 14.9 C, -1.9 C from the station mean2000: 16.3 C, -0.5 C from the station mean2001: 17.0 C, +0.2 C from the station mean2003: 16.8 C, 0.0 C from the station mean2004: 16.8 C, 0.0 C from the station mean2005: 16.4 C, -0.4 C from the station mean2006: 16.4 C, -0.4 C from the station mean2007: 16.9 C, +0.1 C from the station mean2008: 17.0 C, +0.2 C from the station mean2009: 16.7 C, -0.1 C from the station mean2010: 15.5 C, -1.3 C from the station mean2011: 15.9 C, -0.9 C from the station mean2014: 18.1 C, +1.3 C from the station mean2015: 17.8 C, +1.0 C from the station mean2016: 16.8 C, 0.0 C from the station mean2017: 17.0 C, +0.2 C from the station mean2018: 17.2 C, +0.4 C from the station mean2019: 16.2 C, -0.6 C from the station mean2020: 18.0 C, +1.2 C from the station mean2021: 17.6 C, +0.8 C from the station mean2022: 17.4 C, +0.6 C from the station mean2023: 16.0 C, -0.8 C from the station mean2024: 17.3 C, +0.5 C from the station mean2025: 17.3 C, +0.5 C from the station mean1996200020052010201520202025
One stripe for each of 26 complete years at County Line California, 1996 to 2025. Blue stripes are years cooler than the station's own mean of 16.8 C (62.2 F); red stripes are warmer. The coolest year was 1998, at 14.9 C (58.8 F), and the warmest was 2014, at 18.1 C (64.7 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at County Line California as warming stripes, 1996 to 2025
YearAnnual mean temperatureDifference from the station mean
199616.9 C+0.08 C
199716.6 C-0.24 C
199814.9 C-1.90 C
200016.3 C-0.51 C
200117.0 C+0.19 C
200316.8 C-0.02 C
200416.8 C+0.04 C
200516.4 C-0.41 C
200616.4 C-0.44 C
200716.9 C+0.13 C
200817.0 C+0.21 C
200916.7 C-0.14 C
201015.5 C-1.30 C
201115.9 C-0.91 C
201418.1 C+1.34 C
201517.8 C+0.97 C
201616.8 C+0.00 C
201717.0 C+0.20 C
201817.2 C+0.39 C
201916.2 C-0.58 C
202018.0 C+1.16 C
202117.6 C+0.83 C
202217.4 C+0.64 C
202316.0 C-0.78 C
202417.3 C+0.48 C
202517.3 C+0.51 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1994 to 2026
Yearly extremes at County Line California: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)45.6 C (114.1 F)200242.2 C (108.0 F)33
Coldest night (TNn)-7.2 C (19.0 F)1998-1.7 C (28.9 F)33

Hottest day (TXx)

Hottest day (TXx) at County Line California by year The hottest day of the year at County Line California, 1994 to 2026. The record is 45.6 C (114.1 F) in 2002, marked on the chart; the median year is 42.2 C (108.0 F). 253035404550200020102020Record: 45.6 C (114.1 F) in 2002
The hottest day of the year at County Line California, 1994 to 2026. The record is 45.6 C (114.1 F) in 2002, marked on the chart; the median year is 42.2 C (108.0 F).
Hottest day (TXx) at County Line California by year
YearHottest day (TXx)
199426.7 C (80.1 F)
199541.1 C (106.0 F)
199642.2 C (108.0 F)
199743.3 C (109.9 F)
199842.8 C (109.0 F)
199943.3 C (109.9 F)
200041.1 C (106.0 F)
200142.8 C (109.0 F)
200245.6 C (114.1 F)
200345.0 C (113.0 F)
200440.6 C (105.1 F)
200543.3 C (109.9 F)
200643.9 C (111.0 F)
200743.3 C (109.9 F)
200845.6 C (114.1 F)
200943.9 C (111.0 F)
201041.7 C (107.1 F)
201139.4 C (102.9 F)
201241.7 C (107.1 F)
201343.3 C (109.9 F)
201440.6 C (105.1 F)
201541.1 C (106.0 F)
201641.1 C (106.0 F)
201742.2 C (108.0 F)
201842.2 C (108.0 F)
201940.0 C (104.0 F)
202042.2 C (108.0 F)
202144.4 C (111.9 F)
202243.3 C (109.9 F)
202341.7 C (107.1 F)
202443.9 C (111.0 F)
202539.4 C (102.9 F)
202640.6 C (105.1 F)

Coldest night (TNn)

Coldest night (TNn) at County Line California by year The coldest night of the year at County Line California, 1994 to 2026. The record is -7.2 C (19.0 F) in 1998, marked on the chart; the median year is -1.7 C (28.9 F). -8-6-4-20200020102020Record: -7.2 C (19.0 F) in 1998
The coldest night of the year at County Line California, 1994 to 2026. The record is -7.2 C (19.0 F) in 1998, marked on the chart; the median year is -1.7 C (28.9 F).
Coldest night (TNn) at County Line California by year
YearColdest night (TNn)
1994-1.1 C (30.0 F)
1995-1.1 C (30.0 F)
1996-2.2 C (28.0 F)
1997-5.6 C (21.9 F)
1998-7.2 C (19.0 F)
1999-2.2 C (28.0 F)
20000.0 C (32.0 F)
2001-1.1 C (30.0 F)
2002-1.7 C (28.9 F)
2003-1.1 C (30.0 F)
2004-2.2 C (28.0 F)
2005-1.1 C (30.0 F)
2006-4.4 C (24.1 F)
2007-3.9 C (25.0 F)
2008-2.8 C (27.0 F)
2009-4.4 C (24.1 F)
2010-1.7 C (28.9 F)
2011-3.3 C (26.1 F)
2012-3.3 C (26.1 F)
2013-4.4 C (24.1 F)
20140.0 C (32.0 F)
2015-1.1 C (30.0 F)
2016-1.7 C (28.9 F)
2017-2.2 C (28.0 F)
2018-2.2 C (28.0 F)
2019-2.2 C (28.0 F)
20200.0 C (32.0 F)
2021-1.7 C (28.9 F)
2022-1.1 C (30.0 F)
2023-2.8 C (27.0 F)
2024-0.6 C (30.9 F)
2025-1.1 C (30.0 F)
2026-1.1 C (30.0 F)

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Download the Data

  • Data for County Line California standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for County Line California threshold days by year: CSV or JSON. Field meanings are on the data page.

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 (12 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-13).