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Built 2026-10-15 (15 October 2026)

Boonville California Weather Records (USR0000CBOO)

Record envelope, standing records and threshold days for Boonville California (USR0000CBOO), California, United States, with 34 years of record.

Key Facts for Boonville California

  • Boonville California (USR0000CBOO) is a weather station in California, United States at 38.99 latitude and -123.35 longitude, 196 m (644 ft) above sea level.
  • The station reports from 1990 to 2023, 34 years of record.
  • 1,464 records set at Boonville California still stand.
  • Records are tracked for tmax, tmin: an element needs 30 years of data to be eligible.
  • Boonville California tied a daily record high minimum temperature of 15.6 C (60.1 F) on 6 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, 38.99 latitude, -123.35 longitude.
  • Elevation: 196 m (644 ft).
  • Period of record: 1990 to 2023, 34 years.
  • Eligible elements: tmax, tmin.

Daily Record Envelope and 2026

20 days at or beyond a record
Daily record high and record low at Boonville California, with 2026 drawn through them The band shows the record high and record low for each calendar day at Boonville California. The lines show the 2026 daily maximum and minimum. 20 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 Boonville California. The lines show the 2026 daily maximum and minimum. 20 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Boonville California, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan26.7 C (80.1 F)-5.0 C (23.0 F)26.7 C (80.1 F)-0.6 C (30.9 F)
Feb28.3 C (82.9 F)-3.9 C (25.0 F)26.1 C (79.0 F)-1.7 C (28.9 F)
Mar33.3 C (91.9 F)-2.2 C (28.0 F)33.3 C (91.9 F)2.2 C (36.0 F)
Apr35.0 C (95.0 F)-1.7 C (28.9 F)28.9 C (84.0 F)1.1 C (34.0 F)
May40.6 C (105.1 F)0.6 C (33.1 F)33.3 C (91.9 F)5.0 C (41.0 F)
Jun41.7 C (107.1 F)3.3 C (37.9 F)36.7 C (98.1 F)5.6 C (42.1 F)
Jul43.3 C (109.9 F)6.1 C (43.0 F)36.1 C (97.0 F)8.3 C (46.9 F)
Aug44.4 C (111.9 F)6.7 C (44.1 F)39.4 C (102.9 F)8.3 C (46.9 F)
Sep46.9 C (116.4 F)3.3 C (37.9 F)35.0 C (95.0 F)7.8 C (46.0 F)
Oct40.6 C (105.1 F)0.0 C (32.0 F)38.9 C (102.0 F)4.4 C (39.9 F)
Nov32.2 C (90.0 F)-2.8 C (27.0 F)n/an/a
Dec25.6 C (78.1 F)-8.9 C (16.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Boonville California by the year they were set 1,464 records at Boonville California still stand. 1999 holds the most, with 72. 0204060801990: 471991: 631992: 621993: 511994: 451995: 491996: 531997: 311998: 471999: 722000: 392001: 422002: 422003: 312004: 202005: 332006: 512007: 412008: 602009: 472010: 392011: 292012: 432013: 392014: 372015: 352016: 252017: 352018: 202019: 342020: 342021: 182022: 342023: 352024: 362025: 242026: 211990199419982002200620102014201820222026
1,464 records at Boonville California still stand. 1999 holds the most, with 72.
Standing records at Boonville California by the year they were set
Year setStanding records
199047
199163
199262
199351
199445
199549
199653
199731
199847
199972
200039
200142
200242
200331
200420
200533
200651
200741
200860
200947
201039
201129
201243
201339
201437
201535
201625
201735
201820
201934
202034
202118
202234
202335
202436
202524
202621

All-Time Record Progression

1 new records
When Boonville California set new all-time records 1 all-time records were set at Boonville California between 6 September 2022 and 6 September 2022. Each dot is a new record. Record high maximum temperature6 September 2022: Record high maximum temperature 46.9 C (116.4 F)
1 all-time records were set at Boonville California between 6 September 2022 and 6 September 2022. Each dot is a new record.
When Boonville California set new all-time records
DateKindDetail
2022-09-06Record high maximum temperatureRecord high maximum temperature 46.9 C (116.4 F)

Period of Record Coverage

1990 to 2026
Days with data per year at Boonville California 37 years of record at Boonville California, 1990 to 2026. 4 years have data for under 90 percent of days and are left out of rankings: 1990, 1993, 2002, 2026. 1990: 237 of 365 days1991: 337 of 365 days1992: 351 of 366 days1993: 275 of 365 days1994: 364 of 365 days1995: 364 of 365 days1996: 363 of 366 days1997: 365 of 365 days1998: 365 of 365 days1999: 365 of 365 days2000: 365 of 366 days2001: 348 of 365 days2002: 324 of 365 days2003: 365 of 365 days2004: 365 of 366 days2005: 365 of 365 days2006: 364 of 365 days2007: 365 of 365 days2008: 366 of 366 days2009: 365 of 365 days2010: 365 of 365 days2011: 365 of 365 days2012: 366 of 366 days2013: 365 of 365 days2014: 365 of 365 days2015: 365 of 365 days2016: 366 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: 366 of 366 days2025: 364 of 365 days2026: 284 of 365 days19901995200020052010201520202025
37 years of record at Boonville California, 1990 to 2026. 4 years have data for under 90 percent of days and are left out of rankings: 1990, 1993, 2002, 2026.
Days with data per year at Boonville California
YearDays with dataShare of yearComplete
199023765%No
199133792%Yes
199235196%Yes
199327575%No
1994364100%Yes
1995364100%Yes
199636399%Yes
1997365100%Yes
1998365100%Yes
1999365100%Yes
2000365100%Yes
200134895%Yes
200232489%No
2003365100%Yes
2004365100%Yes
2005365100%Yes
2006364100%Yes
2007365100%Yes
2008366100%Yes
2009365100%Yes
2010365100%Yes
2011365100%Yes
2012366100%Yes
2013365100%Yes
2014365100%Yes
2015365100%Yes
2016366100%Yes
2017365100%Yes
2018365100%Yes
2019365100%Yes
2020366100%Yes
2021365100%Yes
2022365100%Yes
2023365100%Yes
2024366100%Yes
2025364100%Yes
202628478%No

Latest Records

20
Latest records at Boonville California
DateStationRecordValueBeat old record byOld record stoodSignificance
6 October 2026Boonville California, USdaily high min (Tie, Provisional)15.6 C (60.1 F)tie1 year0 of 100 (Routine)
5 October 2026Boonville California, USdaily high min (Provisional)15.0 C (59.0 F)1.1 C (2.0 F)29 years14 of 100 (Routine)
5 October 2026Boonville California, USdaily high max (Provisional)37.8 C (100.0 F)1.1 C (2.0 F)1 year4 of 100 (Routine)
4 October 2026Boonville California, USmonthly high min (Tie, Provisional)16.7 C (62.1 F)tie6 years3 of 100 (Routine)
3 October 2026Boonville California, USdaily high min (Tie, Provisional)15.0 C (59.0 F)tie8 years1 of 100 (Routine)
3 October 2026Boonville California, USdaily high max (Tie, Provisional)38.9 C (102.0 F)tie1 year0 of 100 (Routine)
3 September 2026Boonville California, USdaily low max (Provisional)19.4 C (66.9 F)0.6 C (1.1 F)33 years14 of 100 (Routine)
29 August 2026Boonville California, USdaily low min (Tie, Provisional)8.3 C (46.9 F)tie16 years1 of 100 (Routine)
28 June 2026Boonville California, USdaily low min7.8 C (46.0 F)0.5 C (0.9 F)32 years14 of 100 (Routine)
17 April 2026Boonville California, USdaily low min (Tie)1.1 C (34.0 F)tie12 years1 of 100 (Routine)
10 April 2026Boonville California, USdaily high min11.7 C (53.1 F)0.6 C (1.1 F)24 years12 of 100 (Routine)
5 April 2026Boonville California, USdaily high max28.9 C (84.0 F)2.8 C (5.0 F)19 years13 of 100 (Routine)
4 April 2026Boonville California, USdaily high max28.3 C (82.9 F)3.3 C (5.9 F)15 years13 of 100 (Routine)
31 March 2026Boonville California, USdaily high min10.6 C (51.1 F)0.6 C (1.1 F)23 years11 of 100 (Routine)
29 March 2026Boonville California, USdaily high max (Tie)28.9 C (84.0 F)tie8 years1 of 100 (Routine)
28 March 2026Boonville California, USdaily high max (Tie)28.9 C (84.0 F)tie21 years2 of 100 (Routine)
27 March 2026Boonville California, USdaily high max30.0 C (86.0 F)3.3 C (5.9 F)4 years10 of 100 (Routine)
23 March 2026Boonville California, USdaily high max25.0 C (77.0 F)0.6 C (1.1 F)12 years7 of 100 (Routine)
20 March 2026Boonville California, USmonthly high max (Tie)33.3 C (91.9 F)tie0 years3 of 100 (Routine)
19 March 2026Boonville California, USdaily high max32.2 C (90.0 F)4.4 C (7.9 F)16 years15 of 100 (Routine)

Climate Trend

31 complete years, 1992 to 2025
Annual mean temperature at Boonville California as warming stripes, 1992 to 2025 One stripe for each of 31 complete years at Boonville California, 1992 to 2025. Blue stripes are years cooler than the station's own mean of 14.6 C (58.4 F); red stripes are warmer. The coolest year was 2011, at 13.5 C (56.4 F), and the warmest was 2014, at 15.9 C (60.5 F). The strongest colour marks a difference of 1.3 C (2.3 F). 1992: 15.1 C, +0.4 C from the station mean1994: 14.3 C, -0.4 C from the station mean1995: 15.2 C, +0.6 C from the station mean1996: 15.4 C, +0.8 C from the station mean1997: 15.3 C, +0.7 C from the station mean1998: 14.3 C, -0.4 C from the station mean1999: 14.3 C, -0.4 C from the station mean2000: 14.7 C, +0.1 C from the station mean2003: 14.7 C, +0.1 C from the station mean2004: 14.8 C, +0.2 C from the station mean2005: 14.6 C, -0.1 C from the station mean2006: 14.1 C, -0.5 C from the station mean2007: 13.5 C, -1.1 C from the station mean2008: 13.8 C, -0.8 C from the station mean2009: 14.1 C, -0.5 C from the station mean2010: 13.7 C, -0.9 C from the station mean2011: 13.5 C, -1.1 C from the station mean2012: 13.9 C, -0.7 C from the station mean2013: 14.3 C, -0.3 C from the station mean2014: 15.9 C, +1.2 C from the station mean2015: 15.6 C, +0.9 C from the station mean2016: 14.9 C, +0.2 C from the station mean2017: 14.9 C, +0.2 C from the station mean2018: 14.5 C, -0.1 C from the station mean2019: 14.8 C, +0.1 C from the station mean2020: 15.3 C, +0.7 C from the station mean2021: 14.9 C, +0.2 C from the station mean2022: 14.7 C, 0.0 C from the station mean2023: 14.5 C, -0.2 C from the station mean2024: 15.4 C, +0.7 C from the station mean2025: 15.1 C, +0.5 C from the station mean19921995200020052010201520202025
One stripe for each of 31 complete years at Boonville California, 1992 to 2025. Blue stripes are years cooler than the station's own mean of 14.6 C (58.4 F); red stripes are warmer. The coolest year was 2011, at 13.5 C (56.4 F), and the warmest was 2014, at 15.9 C (60.5 F). The strongest colour marks a difference of 1.3 C (2.3 F).
Annual mean temperature at Boonville California as warming stripes, 1992 to 2025
YearAnnual mean temperatureDifference from the station mean
199215.1 C+0.44 C
199414.3 C-0.37 C
199515.2 C+0.59 C
199615.4 C+0.78 C
199715.3 C+0.66 C
199814.3 C-0.36 C
199914.3 C-0.40 C
200014.7 C+0.08 C
200314.7 C+0.07 C
200414.8 C+0.16 C
200514.6 C-0.07 C
200614.1 C-0.51 C
200713.5 C-1.11 C
200813.8 C-0.84 C
200914.1 C-0.53 C
201013.7 C-0.92 C
201113.5 C-1.12 C
201213.9 C-0.75 C
201314.3 C-0.33 C
201415.9 C+1.21 C
201515.6 C+0.90 C
201614.9 C+0.23 C
201714.9 C+0.24 C
201814.5 C-0.15 C
201914.8 C+0.12 C
202015.3 C+0.67 C
202114.9 C+0.22 C
202214.7 C+0.00 C
202314.5 C-0.19 C
202415.4 C+0.72 C
202515.1 C+0.46 C

The fitted trend in annual mean temperature here over 1992 to 2025 is 0.1 C (-0.2 to 0.3) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.3 to 0.5) per decade. The slope is a straight line fitted to 31 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Boonville California
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.1 C (-0.2 to 0.3) per decade0.1 F (-0.3 to 0.5) per decade1992 to 202531Not clearly different from zero
Mean daily maximum0.1 C (-0.2 to 0.4) per decade0.2 F (-0.4 to 0.7) per decade1992 to 202531Not clearly different from zero
Mean daily minimum0.01 C (-0.21 to 0.23) per decade0.02 F (-0.38 to 0.42) per decade1992 to 202531Not clearly different from zero

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

1990 to 2026
Yearly extremes at Boonville California: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)46.9 C (116.4 F)202241.1 C (106.0 F)37
Coldest night (TNn)-8.9 C (16.0 F)1990-2.8 C (27.0 F)37

Hottest day (TXx)

Hottest day (TXx) at Boonville California by year The hottest day of the year at Boonville California, 1990 to 2026. The record is 46.9 C (116.4 F) in 2022, marked on the chart; the median year is 41.1 C (106.0 F). 37.54042.54547.51990200020102020Record: 46.9 C (116.4 F) in 2022
The hottest day of the year at Boonville California, 1990 to 2026. The record is 46.9 C (116.4 F) in 2022, marked on the chart; the median year is 41.1 C (106.0 F).
Hottest day (TXx) at Boonville California by year
YearHottest day (TXx)
199041.7 C (107.1 F)
199141.7 C (107.1 F)
199240.0 C (104.0 F)
199343.9 C (111.0 F)
199437.8 C (100.0 F)
199542.2 C (108.0 F)
199641.7 C (107.1 F)
199741.1 C (106.0 F)
199844.4 C (111.9 F)
199941.7 C (107.1 F)
200040.6 C (105.1 F)
200140.6 C (105.1 F)
200238.9 C (102.0 F)
200342.8 C (109.0 F)
200440.0 C (104.0 F)
200540.0 C (104.0 F)
200643.3 C (109.9 F)
200738.3 C (100.9 F)
200841.7 C (107.1 F)
200941.1 C (106.0 F)
201041.7 C (107.1 F)
201138.9 C (102.0 F)
201240.6 C (105.1 F)
201341.7 C (107.1 F)
201440.0 C (104.0 F)
201539.4 C (102.9 F)
201639.4 C (102.9 F)
201743.3 C (109.9 F)
201837.8 C (100.0 F)
201940.0 C (104.0 F)
202043.3 C (109.9 F)
202140.6 C (105.1 F)
202246.9 C (116.4 F)
202341.1 C (106.0 F)
202443.3 C (109.9 F)
202538.9 C (102.0 F)
202639.4 C (102.9 F)

Coldest night (TNn)

Coldest night (TNn) at Boonville California by year The coldest night of the year at Boonville California, 1990 to 2026. The record is -8.9 C (16.0 F) in 1990, marked on the chart; the median year is -2.8 C (27.0 F). -10-7.5-5-2.501990200020102020Record: -8.9 C (16.0 F) in 1990
The coldest night of the year at Boonville California, 1990 to 2026. The record is -8.9 C (16.0 F) in 1990, marked on the chart; the median year is -2.8 C (27.0 F).
Coldest night (TNn) at Boonville California by year
YearColdest night (TNn)
1990-8.9 C (16.0 F)
1991-2.8 C (27.0 F)
1992-2.8 C (27.0 F)
1993-3.9 C (25.0 F)
1994-2.8 C (27.0 F)
1995-2.8 C (27.0 F)
1996-2.8 C (27.0 F)
1997-3.3 C (26.1 F)
1998-6.7 C (19.9 F)
1999-1.7 C (28.9 F)
2000-0.6 C (30.9 F)
2001-2.8 C (27.0 F)
2002-4.4 C (24.1 F)
2003-2.2 C (28.0 F)
2004-2.2 C (28.0 F)
2005-1.1 C (30.0 F)
2006-2.2 C (28.0 F)
2007-5.0 C (23.0 F)
2008-3.3 C (26.1 F)
2009-4.4 C (24.1 F)
2010-2.8 C (27.0 F)
2011-3.3 C (26.1 F)
2012-3.3 C (26.1 F)
2013-5.0 C (23.0 F)
2014-3.3 C (26.1 F)
2015-2.2 C (28.0 F)
2016-2.8 C (27.0 F)
2017-1.7 C (28.9 F)
2018-3.9 C (25.0 F)
2019-2.8 C (27.0 F)
2020-2.8 C (27.0 F)
2021-2.2 C (28.0 F)
2022-3.3 C (26.1 F)
2023-3.4 C (25.9 F)
2024-2.2 C (28.0 F)
2025-2.2 C (28.0 F)
2026-1.7 C (28.9 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

29 years with a frost

Across 29 years with a frost, the median last spring frost at Boonville California falls on 19 March and the median first autumn frost on 28 November, which leaves a median of 256 days between them.

Fitted over all years, the growing season changes by +5.2 days per decade at this station.

Frost dates and growing season at Boonville California
MeasureMedian, all yearsEarliest periodRecent period (1992 to 2024)Recent against earliestFitted trend
Last spring frost19 Marchn/a19 Marchn/a-2.9 days per decade
First autumn frost28 Novembern/a28 Novembern/a+2.4 days per decade
Growing days256 daysn/a256 daysn/a+5.2 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 Boonville California standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Boonville 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-14).