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Built 2026-10-15 (15 October 2026)

Santa Rosa Island California Weather Records (USR0000CSRI)

Record envelope, standing records and threshold days for Santa Rosa Island California (USR0000CSRI), California, United States, with 34 years of record.

Key Facts for Santa Rosa Island California

  • Santa Rosa Island California (USR0000CSRI) is a weather station in California, United States at 33.98 latitude and -120.08 longitude, 396 m (1,298 ft) above sea level.
  • The station reports from 1990 to 2023, 34 years of record.
  • 1,464 records set at Santa Rosa Island California still stand.
  • Records are tracked for tmax, tmin: an element needs 30 years of data to be eligible.
  • Santa Rosa Island California set a daily record high minimum temperature of 23.9 C (75.0 F) on 5 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, 33.98 latitude, -120.08 longitude.
  • Elevation: 396 m (1,298 ft).
  • Period of record: 1990 to 2023, 34 years.
  • Eligible elements: tmax, tmin.

Daily Record Envelope and 2026

21 days at or beyond a record
Daily record high and record low at Santa Rosa Island California, with 2026 drawn through them The band shows the record high and record low for each calendar day at Santa Rosa Island California. The lines show the 2026 daily maximum and minimum. 21 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -1001020304050 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Santa Rosa Island California. The lines show the 2026 daily maximum and minimum. 21 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Santa Rosa Island California, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan30.6 C (87.1 F)1.1 C (34.0 F)27.8 C (82.0 F)7.8 C (46.0 F)
Feb29.6 C (85.3 F)0.0 C (32.0 F)29.4 C (84.9 F)5.6 C (42.1 F)
Mar35.6 C (96.1 F)1.7 C (35.1 F)35.6 C (96.1 F)8.9 C (48.0 F)
Apr35.0 C (95.0 F)1.1 C (34.0 F)27.2 C (81.0 F)8.9 C (48.0 F)
May35.6 C (96.1 F)3.9 C (39.0 F)26.7 C (80.1 F)7.8 C (46.0 F)
Jun37.8 C (100.0 F)5.6 C (42.1 F)26.1 C (79.0 F)8.9 C (48.0 F)
Jul37.8 C (100.0 F)7.2 C (45.0 F)30.0 C (86.0 F)10.0 C (50.0 F)
Aug37.8 C (100.0 F)7.2 C (45.0 F)33.9 C (93.0 F)12.2 C (54.0 F)
Sep42.8 C (109.0 F)8.3 C (46.9 F)37.2 C (99.0 F)12.2 C (54.0 F)
Oct36.7 C (98.1 F)6.1 C (43.0 F)36.7 C (98.1 F)13.3 C (55.9 F)
Nov33.3 C (91.9 F)3.3 C (37.9 F)n/an/a
Dec30.0 C (86.0 F)-2.2 C (28.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Santa Rosa Island California by the year they were set 1,464 records at Santa Rosa Island California still stand. 1991 holds the most, with 104. 0501001501990: 371991: 1041992: 181993: 241994: 631995: 281996: 691997: 231998: 391999: 932000: 922001: 772002: 492003: 242004: 312005: 162006: 432007: 392008: 512009: 392010: 322011: 252012: 242013: 252014: 292015: 472016: 462017: 422018: 382019: 242020: 502021: 262022: 322023: 92024: 112025: 212026: 241990199419982002200620102014201820222026
1,464 records at Santa Rosa Island California still stand. 1991 holds the most, with 104.
Standing records at Santa Rosa Island California by the year they were set
Year setStanding records
199037
1991104
199218
199324
199463
199528
199669
199723
199839
199993
200092
200177
200249
200324
200431
200516
200643
200739
200851
200939
201032
201125
201224
201325
201429
201547
201646
201742
201838
201924
202050
202126
202232
20239
202411
202521
202624

All-Time Record Progression

1 new records
When Santa Rosa Island California set new all-time records 1 all-time records were set at Santa Rosa Island California between 6 September 2020 and 6 September 2020. Each dot is a new record. Record high maximum temperature6 September 2020: Record high maximum temperature 42.8 C (109.0 F)2020
1 all-time records were set at Santa Rosa Island California between 6 September 2020 and 6 September 2020. Each dot is a new record.
When Santa Rosa Island California set new all-time records
DateKindDetail
2020-09-06Record high maximum temperatureRecord high maximum temperature 42.8 C (109.0 F)

Period of Record Coverage

1990 to 2026
Days with data per year at Santa Rosa Island California 37 years of record at Santa Rosa Island California, 1990 to 2026. 7 years have data for under 90 percent of days and are left out of rankings: 1990, 1994, 1995, 1999, 2007, 2024, 2026. 1990: 253 of 365 days1991: 340 of 365 days1992: 366 of 366 days1993: 341 of 365 days1994: 327 of 365 days1995: 305 of 365 days1996: 362 of 366 days1997: 362 of 365 days1998: 364 of 365 days1999: 255 of 365 days2000: 365 of 366 days2001: 364 of 365 days2002: 363 of 365 days2003: 361 of 365 days2004: 363 of 366 days2005: 363 of 365 days2006: 363 of 365 days2007: 272 of 365 days2008: 365 of 366 days2009: 365 of 365 days2010: 364 of 365 days2011: 364 of 365 days2012: 366 of 366 days2013: 365 of 365 days2014: 363 of 365 days2015: 364 of 365 days2016: 363 of 366 days2017: 363 of 365 days2018: 365 of 365 days2019: 360 of 365 days2020: 364 of 366 days2021: 365 of 365 days2022: 365 of 365 days2023: 365 of 365 days2024: 218 of 366 days2025: 353 of 365 days2026: 284 of 365 days19901995200020052010201520202025
37 years of record at Santa Rosa Island California, 1990 to 2026. 7 years have data for under 90 percent of days and are left out of rankings: 1990, 1994, 1995, 1999, 2007, 2024, 2026.
Days with data per year at Santa Rosa Island California
YearDays with dataShare of yearComplete
199025369%No
199134093%Yes
1992366100%Yes
199334193%Yes
199432790%No
199530584%No
199636299%Yes
199736299%Yes
1998364100%Yes
199925570%No
2000365100%Yes
2001364100%Yes
200236399%Yes
200336199%Yes
200436399%Yes
200536399%Yes
200636399%Yes
200727275%No
2008365100%Yes
2009365100%Yes
2010364100%Yes
2011364100%Yes
2012366100%Yes
2013365100%Yes
201436399%Yes
2015364100%Yes
201636399%Yes
201736399%Yes
2018365100%Yes
201936099%Yes
202036499%Yes
2021365100%Yes
2022365100%Yes
2023365100%Yes
202421860%No
202535397%Yes
202628478%No

Latest Records

20
Latest records at Santa Rosa Island California
DateStationRecordValueBeat old record byOld record stoodSignificance
5 October 2026Santa Rosa Island California, USdaily high min (Provisional)23.9 C (75.0 F)1.1 C (2.0 F)12 years8 of 100 (Routine)
4 October 2026Santa Rosa Island California, USdaily high max (Provisional)36.1 C (97.0 F)0.5 C (0.9 F)12 years6 of 100 (Routine)
3 October 2026Santa Rosa Island California, USdaily high min (Provisional)26.7 C (80.1 F)3.8 C (6.8 F)4 years14 of 100 (Routine)
3 October 2026Santa Rosa Island California, USmonthly high max (Tie, Provisional)36.7 C (98.1 F)tie14 years4 of 100 (Routine)
9 September 2026Santa Rosa Island California, USdaily high max (Provisional)37.2 C (99.0 F)3.3 C (5.9 F)11 years12 of 100 (Routine)
9 September 2026Santa Rosa Island California, USdaily high min (Tie, Provisional)25.0 C (77.0 F)tie11 years1 of 100 (Routine)
26 August 2026Santa Rosa Island California, USdaily high min (Provisional)22.2 C (72.0 F)2.2 C (4.0 F)16 years16 of 100 (Routine)
26 August 2026Santa Rosa Island California, USdaily high max (Provisional)33.9 C (93.0 F)3.3 C (5.9 F)20 years15 of 100 (Routine)
25 August 2026Santa Rosa Island California, USdaily high min (Provisional)18.3 C (64.9 F)0.5 C (0.9 F)7 years6 of 100 (Routine)
24 August 2026Santa Rosa Island California, USdaily high max (Tie, Provisional)30.6 C (87.1 F)tie16 years1 of 100 (Routine)
21 July 2026Santa Rosa Island California, USdaily high max30.0 C (86.0 F)2.2 C (4.0 F)20 years13 of 100 (Routine)
20 July 2026Santa Rosa Island California, USdaily high max (Tie)27.2 C (81.0 F)tie20 years2 of 100 (Routine)
14 July 2026Santa Rosa Island California, USdaily high min17.2 C (63.0 F)2.2 C (4.0 F)12 years14 of 100 (Routine)
12 June 2026Santa Rosa Island California, USdaily high min (Tie)15.6 C (60.1 F)tie8 years1 of 100 (Routine)
23 May 2026Santa Rosa Island California, USdaily high min (Tie)10.6 C (51.1 F)tie28 years2 of 100 (Routine)
19 May 2026Santa Rosa Island California, USdaily high min (Tie)16.7 C (62.1 F)tie8 years1 of 100 (Routine)
18 April 2026Santa Rosa Island California, USdaily high min13.3 C (55.9 F)1.1 C (2.0 F)16 years12 of 100 (Routine)
5 April 2026Santa Rosa Island California, USdaily high max26.1 C (79.0 F)0.5 C (0.9 F)9 years5 of 100 (Routine)
4 April 2026Santa Rosa Island California, USdaily high min18.9 C (66.0 F)9.5 C (17.1 F)7 years44 of 100 (Notable)
4 April 2026Santa Rosa Island California, USdaily high max27.2 C (81.0 F)3.9 C (7.0 F)35 years20 of 100 (Routine)

Climate Trend

28 complete years, 1992 to 2023
Annual mean temperature at Santa Rosa Island California as warming stripes, 1992 to 2023 One stripe for each of 28 complete years at Santa Rosa Island California, 1992 to 2023. Blue stripes are years cooler than the station's own mean of 13.9 C (56.9 F); red stripes are warmer. The coolest year was 2000, at 11.5 C (52.8 F), and the warmest was 2015, at 15.9 C (60.7 F). The strongest colour marks a difference of 2.4 C (4.3 F). 1992: 13.7 C, -0.2 C from the station mean1993: 12.8 C, -1.1 C from the station mean1996: 13.0 C, -0.9 C from the station mean1997: 13.5 C, -0.3 C from the station mean1998: 12.4 C, -1.4 C from the station mean2000: 11.5 C, -2.3 C from the station mean2001: 12.1 C, -1.8 C from the station mean2002: 12.6 C, -1.3 C from the station mean2003: 13.3 C, -0.6 C from the station mean2004: 13.8 C, -0.1 C from the station mean2005: 14.0 C, +0.1 C from the station mean2006: 14.1 C, +0.2 C from the station mean2008: 13.4 C, -0.4 C from the station mean2009: 14.2 C, +0.3 C from the station mean2010: 13.3 C, -0.6 C from the station mean2011: 13.2 C, -0.7 C from the station mean2012: 13.6 C, -0.3 C from the station mean2013: 14.1 C, +0.2 C from the station mean2014: 15.6 C, +1.7 C from the station mean2015: 15.9 C, +2.1 C from the station mean2016: 15.0 C, +1.2 C from the station mean2017: 15.4 C, +1.5 C from the station mean2018: 15.0 C, +1.1 C from the station mean2019: 14.4 C, +0.6 C from the station mean2020: 15.3 C, +1.4 C from the station mean2021: 14.3 C, +0.5 C from the station mean2022: 14.8 C, +1.0 C from the station mean2023: 14.0 C, +0.1 C from the station mean1992199520002005201020152020
One stripe for each of 28 complete years at Santa Rosa Island California, 1992 to 2023. Blue stripes are years cooler than the station's own mean of 13.9 C (56.9 F); red stripes are warmer. The coolest year was 2000, at 11.5 C (52.8 F), and the warmest was 2015, at 15.9 C (60.7 F). The strongest colour marks a difference of 2.4 C (4.3 F).
Annual mean temperature at Santa Rosa Island California as warming stripes, 1992 to 2023
YearAnnual mean temperatureDifference from the station mean
199213.7 C-0.17 C
199312.8 C-1.11 C
199613.0 C-0.89 C
199713.5 C-0.33 C
199812.4 C-1.44 C
200011.5 C-2.33 C
200112.1 C-1.77 C
200212.6 C-1.25 C
200313.3 C-0.61 C
200413.8 C-0.10 C
200514.0 C+0.12 C
200614.1 C+0.19 C
200813.4 C-0.44 C
200914.2 C+0.35 C
201013.3 C-0.61 C
201113.2 C-0.71 C
201213.6 C-0.28 C
201314.1 C+0.25 C
201415.6 C+1.72 C
201515.9 C+2.06 C
201615.0 C+1.18 C
201715.4 C+1.53 C
201815.0 C+1.11 C
201914.4 C+0.56 C
202015.3 C+1.42 C
202114.3 C+0.48 C
202214.8 C+0.96 C
202314.0 C+0.13 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

1990 to 2026
Yearly extremes at Santa Rosa Island California: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)42.8 C (109.0 F)202033.9 C (93.0 F)37
Coldest night (TNn)-2.2 C (28.0 F)19902.8 C (37.0 F)37

Hottest day (TXx)

Hottest day (TXx) at Santa Rosa Island California by year The hottest day of the year at Santa Rosa Island California, 1990 to 2026. The record is 42.8 C (109.0 F) in 2020, marked on the chart; the median year is 33.9 C (93.0 F). 25303540451990200020102020Record: 42.8 C (109.0 F) in 2020
The hottest day of the year at Santa Rosa Island California, 1990 to 2026. The record is 42.8 C (109.0 F) in 2020, marked on the chart; the median year is 33.9 C (93.0 F).
Hottest day (TXx) at Santa Rosa Island California by year
YearHottest day (TXx)
199030.6 C (87.1 F)
199136.1 C (97.0 F)
199231.1 C (88.0 F)
199329.6 C (85.3 F)
199433.3 C (91.9 F)
199533.3 C (91.9 F)
199632.2 C (90.0 F)
199733.9 C (93.0 F)
199833.9 C (93.0 F)
199927.2 C (81.0 F)
200032.2 C (90.0 F)
200131.1 C (88.0 F)
200233.3 C (91.9 F)
200333.9 C (93.0 F)
200435.0 C (95.0 F)
200534.4 C (93.9 F)
200637.8 C (100.0 F)
200740.0 C (104.0 F)
200837.8 C (100.0 F)
200936.1 C (97.0 F)
201039.4 C (102.9 F)
201136.7 C (98.1 F)
201235.6 C (96.1 F)
201333.3 C (91.9 F)
201435.6 C (96.1 F)
201536.1 C (97.0 F)
201636.7 C (98.1 F)
201737.8 C (100.0 F)
201832.8 C (91.0 F)
201933.3 C (91.9 F)
202042.8 C (109.0 F)
202132.5 C (90.5 F)
202237.8 C (100.0 F)
202334.4 C (93.9 F)
202429.4 C (84.9 F)
202531.7 C (89.1 F)
202637.2 C (99.0 F)

Coldest night (TNn)

Coldest night (TNn) at Santa Rosa Island California by year The coldest night of the year at Santa Rosa Island California, 1990 to 2026. The record is -2.2 C (28.0 F) in 1990, marked on the chart; the median year is 2.8 C (37.0 F). -4-202461990200020102020Record: -2.2 C (28.0 F) in 1990
The coldest night of the year at Santa Rosa Island California, 1990 to 2026. The record is -2.2 C (28.0 F) in 1990, marked on the chart; the median year is 2.8 C (37.0 F).
Coldest night (TNn) at Santa Rosa Island California by year
YearColdest night (TNn)
1990-2.2 C (28.0 F)
19911.7 C (35.1 F)
19922.8 C (37.0 F)
19932.2 C (36.0 F)
19943.3 C (37.9 F)
19954.4 C (39.9 F)
19961.1 C (34.0 F)
19974.4 C (39.9 F)
19980.0 C (32.0 F)
19991.1 C (34.0 F)
20003.3 C (37.9 F)
20010.0 C (32.0 F)
20021.1 C (34.0 F)
20033.9 C (39.0 F)
20044.4 C (39.9 F)
20055.0 C (41.0 F)
20062.2 C (36.0 F)
20071.1 C (34.0 F)
20082.2 C (36.0 F)
20092.8 C (37.0 F)
20103.9 C (39.0 F)
20112.2 C (36.0 F)
20122.8 C (37.0 F)
20132.8 C (37.0 F)
20145.0 C (41.0 F)
20155.0 C (41.0 F)
20165.6 C (42.1 F)
20175.0 C (41.0 F)
20183.9 C (39.0 F)
20194.4 C (39.9 F)
20205.1 C (41.2 F)
20212.8 C (37.0 F)
20222.6 C (36.7 F)
20232.2 C (36.0 F)
20245.0 C (41.0 F)
20255.0 C (41.0 F)
20265.6 C (42.1 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 Santa Rosa Island California standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Santa Rosa Island 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.

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