Daily records
Page built 2026-10-19
Data as of 2026-10-17
Search
Built 2026-10-19 (19 October 2026)

Oak Knoll California Weather Records (USR0000COAK)

Record envelope, standing records and threshold days for Oak Knoll California (USR0000COAK), California, United States, with 36 years of record.

Key Facts for Oak Knoll California

  • Oak Knoll California (USR0000COAK) is a weather station in California, United States at 41.84 latitude and -122.85 longitude, 591 m (1,940 ft) above sea level.
  • The station reports from 1988 to 2023, 36 years of record.
  • 1,464 records set at Oak Knoll California still stand.
  • Records are tracked for tmax, tmin: an element needs 30 years of data to be eligible.
  • Oak Knoll California tied a monthly record high maximum temperature of 37.2 C (99.0 F) on 8 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, 41.84 latitude, -122.85 longitude.
  • Elevation: 591 m (1,940 ft).
  • Period of record: 1988 to 2023, 36 years.
  • Eligible elements: tmax, tmin.

Daily Record Envelope and 2026

32 days at or beyond a record
Daily record high and record low at Oak Knoll California, with 2026 drawn through them The band shows the record high and record low for each calendar day at Oak Knoll California. The lines show the 2026 daily maximum and minimum. 32 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 Oak Knoll California. The lines show the 2026 daily maximum and minimum. 32 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Oak Knoll California, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan22.8 C (73.0 F)-14.4 C (6.1 F)20.0 C (68.0 F)-11.7 C (10.9 F)
Feb26.1 C (79.0 F)-15.0 C (5.0 F)22.8 C (73.0 F)-5.0 C (23.0 F)
Mar33.9 C (93.0 F)-7.8 C (18.0 F)30.6 C (87.1 F)-1.1 C (30.0 F)
Apr34.4 C (93.9 F)-5.0 C (23.0 F)28.9 C (84.0 F)-2.2 C (28.0 F)
May38.9 C (102.0 F)-3.9 C (25.0 F)33.3 C (91.9 F)2.2 C (36.0 F)
Jun43.9 C (111.0 F)0.0 C (32.0 F)40.0 C (104.0 F)5.0 C (41.0 F)
Jul48.3 C (118.9 F)2.8 C (37.0 F)39.4 C (102.9 F)7.2 C (45.0 F)
Aug43.9 C (111.0 F)1.1 C (34.0 F)42.2 C (108.0 F)9.4 C (48.9 F)
Sep44.4 C (111.9 F)-1.7 C (28.9 F)37.8 C (100.0 F)5.6 C (42.1 F)
Oct37.2 C (99.0 F)-6.7 C (19.9 F)37.2 C (99.0 F)-1.1 C (30.0 F)
Nov27.2 C (81.0 F)-9.4 C (15.1 F)n/an/a
Dec18.9 C (66.0 F)-17.2 C (1.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Oak Knoll California by the year they were set 1,464 records at Oak Knoll California still stand. 1993 holds the most, with 71. 0204060801989: 471990: 611991: 511992: 481993: 711994: 321995: 571996: 371997: 271998: 311999: 412000: 332001: 342002: 462003: 332004: 142005: 292006: 362007: 352008: 342009: 372010: 392011: 382012: 382013: 372014: 302015: 432016: 362017: 372018: 212019: 302020: 282021: 332022: 682023: 462024: 372025: 402026: 291989199319972001200520092013201720212025
1,464 records at Oak Knoll California still stand. 1993 holds the most, with 71.
Standing records at Oak Knoll California by the year they were set
Year setStanding records
198947
199061
199151
199248
199371
199432
199557
199637
199727
199831
199941
200033
200134
200246
200333
200414
200529
200636
200735
200834
200937
201039
201138
201238
201337
201430
201543
201636
201737
201821
201930
202028
202133
202268
202346
202437
202540
202629

All-Time Record Progression

2 new records
When Oak Knoll California set new all-time records 2 all-time records were set at Oak Knoll California between 29 July 2022 and 30 July 2022. Each dot is a new record. Record high maximum temperatureRecord high minimum temperature29 July 2022: Record high maximum temperature 48.3 C (118.9 F)30 July 2022: Record high minimum temperature 24.4 C (75.9 F)
2 all-time records were set at Oak Knoll California between 29 July 2022 and 30 July 2022. Each dot is a new record.
When Oak Knoll California set new all-time records
DateKindDetail
2022-07-29Record high maximum temperatureRecord high maximum temperature 48.3 C (118.9 F)
2022-07-30Record high minimum temperatureRecord high minimum temperature 24.4 C (75.9 F)

Period of Record Coverage

1988 to 2026
Days with data per year at Oak Knoll California 39 years of record at Oak Knoll California, 1988 to 2026. 4 years have data for under 90 percent of days and are left out of rankings: 1988, 1999, 2024, 2026. 1988: 2 of 366 days1989: 362 of 365 days1990: 361 of 365 days1991: 362 of 365 days1992: 361 of 366 days1993: 332 of 365 days1994: 364 of 365 days1995: 362 of 365 days1996: 365 of 366 days1997: 365 of 365 days1998: 365 of 365 days1999: 325 of 365 days2000: 335 of 366 days2001: 365 of 365 days2002: 338 of 365 days2003: 363 of 365 days2004: 363 of 366 days2005: 365 of 365 days2006: 365 of 365 days2007: 365 of 365 days2008: 366 of 366 days2009: 365 of 365 days2010: 363 of 365 days2011: 365 of 365 days2012: 353 of 366 days2013: 365 of 365 days2014: 365 of 365 days2015: 365 of 365 days2016: 362 of 366 days2017: 365 of 365 days2018: 365 of 365 days2019: 365 of 365 days2020: 366 of 366 days2021: 365 of 365 days2022: 365 of 365 days2023: 365 of 365 days2024: 323 of 366 days2025: 360 of 365 days2026: 273 of 365 days19901995200020052010201520202025
39 years of record at Oak Knoll California, 1988 to 2026. 4 years have data for under 90 percent of days and are left out of rankings: 1988, 1999, 2024, 2026.
Days with data per year at Oak Knoll California
YearDays with dataShare of yearComplete
198821%No
198936299%Yes
199036199%Yes
199136299%Yes
199236199%Yes
199333291%Yes
1994364100%Yes
199536299%Yes
1996365100%Yes
1997365100%Yes
1998365100%Yes
199932589%No
200033592%Yes
2001365100%Yes
200233893%Yes
200336399%Yes
200436399%Yes
2005365100%Yes
2006365100%Yes
2007365100%Yes
2008366100%Yes
2009365100%Yes
201036399%Yes
2011365100%Yes
201235396%Yes
2013365100%Yes
2014365100%Yes
2015365100%Yes
201636299%Yes
2017365100%Yes
2018365100%Yes
2019365100%Yes
2020366100%Yes
2021365100%Yes
2022365100%Yes
2023365100%Yes
202432388%No
202536099%Yes
202627375%No

Latest Records

20
Latest records at Oak Knoll California
DateStationRecordValueBeat old record byOld record stoodSignificance
8 October 2026Oak Knoll California, USmonthly high max (Tie, Provisional)37.2 C (99.0 F)tie29 years5 of 100 (Routine)
7 October 2026Oak Knoll California, USdaily high max (Provisional)36.7 C (98.1 F)0.6 C (1.1 F)29 years11 of 100 (Routine)
6 October 2026Oak Knoll California, USdaily high max (Provisional)36.7 C (98.1 F)1.1 C (2.0 F)4 years5 of 100 (Routine)
6 October 2026Oak Knoll California, USdaily high min (Tie, Provisional)10.0 C (50.0 F)tie4 years1 of 100 (Routine)
5 October 2026Oak Knoll California, USdaily high max (Provisional)36.1 C (97.0 F)1.1 C (2.0 F)4 years5 of 100 (Routine)
3 October 2026Oak Knoll California, USdaily high max (Tie, Provisional)35.6 C (96.1 F)tie35 years3 of 100 (Routine)
2 October 2026Oak Knoll California, USdaily high max (Tie, Provisional)35.6 C (96.1 F)tie24 years2 of 100 (Routine)
3 September 2026Oak Knoll California, USdaily low max (Provisional)18.3 C (64.9 F)3.4 C (6.1 F)25 years16 of 100 (Routine)
2 September 2026Oak Knoll California, USdaily low max (Provisional)16.1 C (61.0 F)4.5 C (8.1 F)25 years18 of 100 (Routine)
20 August 2026Oak Knoll California, USdaily high min (Provisional)16.1 C (61.0 F)0.5 C (0.9 F)9 years6 of 100 (Routine)
7 August 2026Oak Knoll California, USdaily high max42.2 C (108.0 F)0.5 C (0.9 F)25 years11 of 100 (Routine)
6 August 2026Oak Knoll California, USdaily high max (Tie)41.7 C (107.1 F)tie36 years3 of 100 (Routine)
5 August 2026Oak Knoll California, USdaily high max41.7 C (107.1 F)0.6 C (1.1 F)20 years10 of 100 (Routine)
20 July 2026Oak Knoll California, USdaily high min21.1 C (70.0 F)3.9 C (7.0 F)3 years15 of 100 (Routine)
29 June 2026Oak Knoll California, USdaily low min (Tie)5.6 C (42.1 F)tie32 years3 of 100 (Routine)
18 June 2026Oak Knoll California, USdaily high min16.1 C (61.0 F)2.8 C (5.0 F)33 years21 of 100 (Routine)
18 June 2026Oak Knoll California, USdaily high max38.3 C (100.9 F)0.5 C (0.9 F)8 years5 of 100 (Routine)
17 June 2026Oak Knoll California, USdaily high max38.9 C (102.0 F)2.2 C (4.0 F)23 years12 of 100 (Routine)
16 June 2026Oak Knoll California, USdaily high max38.9 C (102.0 F)1.7 C (3.1 F)23 years11 of 100 (Routine)
16 June 2026Oak Knoll California, USdaily high min13.3 C (55.9 F)0.5 C (0.9 F)8 years6 of 100 (Routine)

Climate Trend

32 complete years, 1989 to 2025
Annual mean temperature at Oak Knoll California as warming stripes, 1989 to 2025 One stripe for each of 32 complete years at Oak Knoll California, 1989 to 2025. Blue stripes are years cooler than the station's own mean of 12.9 C (55.2 F); red stripes are warmer. The coolest year was 2011, at 11.8 C (53.3 F), and the warmest was 2025, at 14.2 C (57.6 F). The strongest colour marks a difference of 1.3 C (2.3 F). 1989: 11.9 C, -1.1 C from the station mean1990: 12.0 C, -0.9 C from the station mean1991: 12.5 C, -0.4 C from the station mean1992: 13.8 C, +0.9 C from the station mean1994: 12.6 C, -0.3 C from the station mean1995: 13.1 C, +0.2 C from the station mean1996: 12.9 C, 0.0 C from the station mean1997: 12.7 C, -0.2 C from the station mean1998: 12.5 C, -0.4 C from the station mean2001: 12.9 C, 0.0 C from the station mean2003: 13.3 C, +0.3 C from the station mean2004: 13.0 C, +0.1 C from the station mean2005: 12.6 C, -0.3 C from the station mean2006: 12.7 C, -0.2 C from the station mean2007: 12.4 C, -0.5 C from the station mean2008: 12.1 C, -0.8 C from the station mean2009: 12.7 C, -0.2 C from the station mean2010: 12.4 C, -0.5 C from the station mean2011: 11.8 C, -1.1 C from the station mean2012: 12.7 C, -0.2 C from the station mean2013: 12.3 C, -0.6 C from the station mean2014: 13.8 C, +0.9 C from the station mean2015: 14.1 C, +1.2 C from the station mean2016: 13.3 C, +0.3 C from the station mean2017: 12.8 C, -0.1 C from the station mean2018: 13.3 C, +0.4 C from the station mean2019: 12.7 C, -0.2 C from the station mean2020: 13.4 C, +0.5 C from the station mean2021: 13.5 C, +0.5 C from the station mean2022: 13.6 C, +0.7 C from the station mean2023: 13.7 C, +0.8 C from the station mean2025: 14.2 C, +1.3 C from the station mean19891995200020052010201520202025
One stripe for each of 32 complete years at Oak Knoll California, 1989 to 2025. Blue stripes are years cooler than the station's own mean of 12.9 C (55.2 F); red stripes are warmer. The coolest year was 2011, at 11.8 C (53.3 F), and the warmest was 2025, at 14.2 C (57.6 F). The strongest colour marks a difference of 1.3 C (2.3 F).
Annual mean temperature at Oak Knoll California as warming stripes, 1989 to 2025
YearAnnual mean temperatureDifference from the station mean
198911.9 C-1.06 C
199012.0 C-0.90 C
199112.5 C-0.40 C
199213.8 C+0.88 C
199412.6 C-0.28 C
199513.1 C+0.22 C
199612.9 C+0.01 C
199712.7 C-0.19 C
199812.5 C-0.37 C
200112.9 C-0.02 C
200313.3 C+0.34 C
200413.0 C+0.10 C
200512.6 C-0.34 C
200612.7 C-0.20 C
200712.4 C-0.52 C
200812.1 C-0.78 C
200912.7 C-0.24 C
201012.4 C-0.53 C
201111.8 C-1.07 C
201212.7 C-0.23 C
201312.3 C-0.60 C
201413.8 C+0.91 C
201514.1 C+1.18 C
201613.3 C+0.34 C
201712.8 C-0.09 C
201813.3 C+0.37 C
201912.7 C-0.24 C
202013.4 C+0.51 C
202113.5 C+0.55 C
202213.6 C+0.67 C
202313.7 C+0.83 C
202514.2 C+1.30 C

The annual mean temperature here has risen by 0.3 C (0.1 to 0.5) per decade over 1989 to 2025. In Fahrenheit: 0.5 F (0.2 to 0.8) per decade. The slope is a straight line fitted to 32 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Oak Knoll California
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.3 C (0.1 to 0.5) per decade0.5 F (0.2 to 0.8) per decade1989 to 202532Rise
Mean daily maximum0.23 C (0.01 to 0.44) per decade0.41 F (0.02 to 0.80) per decade1989 to 202532Rise
Mean daily minimum0.3 C (0.1 to 0.6) per decade0.6 F (0.2 to 1.0) per decade1989 to 202532Rise

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

1988 to 2026
Yearly extremes at Oak Knoll California: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)48.3 C (118.9 F)202242.2 C (108.0 F)39
Coldest night (TNn)-17.2 C (1.0 F)1990-8.9 C (16.0 F)39

Hottest day (TXx)

Hottest day (TXx) at Oak Knoll California by year The hottest day of the year at Oak Knoll California, 1988 to 2026. The record is 48.3 C (118.9 F) in 2022, marked on the chart; the median year is 42.2 C (108.0 F). 02040601990200020102020Record: 48.3 C (118.9 F) in 2022
The hottest day of the year at Oak Knoll California, 1988 to 2026. The record is 48.3 C (118.9 F) in 2022, marked on the chart; the median year is 42.2 C (108.0 F).
Hottest day (TXx) at Oak Knoll California by year
YearHottest day (TXx)
19886.7 C (44.1 F)
198939.4 C (102.9 F)
199042.2 C (108.0 F)
199142.8 C (109.0 F)
199243.9 C (111.0 F)
199342.8 C (109.0 F)
199443.3 C (109.9 F)
199540.0 C (104.0 F)
199642.2 C (108.0 F)
199740.6 C (105.1 F)
199844.4 C (111.9 F)
199944.4 C (111.9 F)
200041.7 C (107.1 F)
200142.8 C (109.0 F)
200245.6 C (114.1 F)
200344.4 C (111.9 F)
200441.7 C (107.1 F)
200541.7 C (107.1 F)
200642.8 C (109.0 F)
200742.2 C (108.0 F)
200842.8 C (109.0 F)
200943.3 C (109.9 F)
201041.1 C (106.0 F)
201138.9 C (102.0 F)
201241.7 C (107.1 F)
201342.2 C (108.0 F)
201442.2 C (108.0 F)
201542.2 C (108.0 F)
201642.2 C (108.0 F)
201743.3 C (109.9 F)
201841.1 C (106.0 F)
201941.1 C (106.0 F)
202042.2 C (108.0 F)
202143.9 C (111.0 F)
202248.3 C (118.9 F)
202343.3 C (109.9 F)
202445.0 C (113.0 F)
202543.3 C (109.9 F)
202642.2 C (108.0 F)

Coldest night (TNn)

Coldest night (TNn) at Oak Knoll California by year The coldest night of the year at Oak Knoll California, 1988 to 2026. The record is -17.2 C (1.0 F) in 1990, marked on the chart; the median year is -8.9 C (16.0 F). -20-15-10-501990200020102020Record: -17.2 C (1.0 F) in 1990
The coldest night of the year at Oak Knoll California, 1988 to 2026. The record is -17.2 C (1.0 F) in 1990, marked on the chart; the median year is -8.9 C (16.0 F).
Coldest night (TNn) at Oak Knoll California by year
YearColdest night (TNn)
1988-3.3 C (26.1 F)
1989-15.0 C (5.0 F)
1990-17.2 C (1.0 F)
1991-10.6 C (12.9 F)
1992-7.2 C (19.0 F)
1993-8.3 C (17.1 F)
1994-8.9 C (16.0 F)
1995-5.6 C (21.9 F)
1996-6.7 C (19.9 F)
1997-9.4 C (15.1 F)
1998-13.3 C (8.1 F)
1999-6.7 C (19.9 F)
2000-7.2 C (19.0 F)
2001-7.8 C (18.0 F)
2002-10.0 C (14.0 F)
2003-6.7 C (19.9 F)
2004-6.7 C (19.9 F)
2005-9.4 C (15.1 F)
2006-8.9 C (16.0 F)
2007-12.8 C (9.0 F)
2008-10.6 C (12.9 F)
2009-13.9 C (7.0 F)
2010-7.8 C (18.0 F)
2011-8.9 C (16.0 F)
2012-7.8 C (18.0 F)
2013-14.4 C (6.1 F)
2014-7.8 C (18.0 F)
2015-9.4 C (15.1 F)
2016-8.9 C (16.0 F)
2017-14.4 C (6.1 F)
2018-8.3 C (17.1 F)
2019-8.9 C (16.0 F)
2020-8.3 C (17.1 F)
2021-6.7 C (19.9 F)
2022-9.4 C (15.1 F)
2023-7.2 C (19.0 F)
2024-4.4 C (24.1 F)
2025-10.0 C (14.0 F)
2026-11.7 C (10.9 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.

Frost Dates and Growing Season

32 years with a frost

Across 32 years with a frost, the median last spring frost at Oak Knoll California falls on 9 May and the median first autumn frost on 12 October, which leaves a median of 157 days between them.

Fitted over all years, the growing season changes by +7.1 days per decade at this station.

Frost dates and growing season at Oak Knoll California
MeasureMedian, all yearsEarliest periodRecent period (1991 to 2025)Recent against earliestFitted trend
Last spring frost9 Mayn/a9 Mayn/a-1.5 days per decade
First autumn frost12 Octobern/a13 Octobern/a+5.6 days per decade
Growing days157 daysn/a158 daysn/a+7.1 days per decade

A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.

Download the Data

  • Data for Oak Knoll California standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Oak Knoll 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 2026-10-17 (17 October 2026). Records are computed by this site and are not official.

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