Built 2026-10-14 (14 October 2026)

San Carlos Rsvr Weather Records (USC00027480)

Record envelope, standing records and threshold days for San Carlos Rsvr (USC00027480), Arizona, United States, with 127 years of record.

Key Facts for San Carlos Rsvr

  • San Carlos Rsvr (USC00027480) is a weather station in Arizona, United States at 33.18 latitude and -110.53 longitude, 772 m (2,532 ft) above sea level.
  • The station reports from 1900 to 2026, 127 years of record.
  • 1,464 records set at San Carlos Rsvr still stand.
  • Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • San Carlos Rsvr set a daily record high minimum temperature of 23.9 C (75.0 F) on 20 September 2026 (provisional).

Provisional Records

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

About the Station

  • Location: Arizona, United States, 33.18 latitude, -110.53 longitude.
  • Elevation: 772 m (2,532 ft).
  • Period of record: 1900 to 2026, 127 years.
  • Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

26 days at or beyond a record
Daily record high and record low at San Carlos Rsvr, with 2026 drawn through them The band shows the record high and record low for each calendar day at San Carlos Rsvr. The lines show the 2026 daily maximum and minimum. 26 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 San Carlos Rsvr. The lines show the 2026 daily maximum and minimum. 26 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at San Carlos Rsvr, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan28.3 C (82.9 F)-11.7 C (10.9 F)22.2 C (72.0 F)-0.6 C (30.9 F)
Feb32.2 C (90.0 F)-11.7 C (10.9 F)32.2 C (90.0 F)1.7 C (35.1 F)
Mar38.3 C (100.9 F)-7.8 C (18.0 F)38.3 C (100.9 F)4.4 C (39.9 F)
Apr40.0 C (104.0 F)-4.4 C (24.1 F)33.3 C (91.9 F)8.9 C (48.0 F)
May45.0 C (113.0 F)-0.6 C (30.9 F)39.4 C (102.9 F)9.4 C (48.9 F)
Jun46.7 C (116.1 F)5.0 C (41.0 F)42.2 C (108.0 F)15.0 C (59.0 F)
Jul46.7 C (116.1 F)10.0 C (50.0 F)43.9 C (111.0 F)17.2 C (63.0 F)
Aug46.7 C (116.1 F)7.2 C (45.0 F)45.0 C (113.0 F)20.0 C (68.0 F)
Sep43.3 C (109.9 F)3.3 C (37.9 F)38.3 C (100.9 F)20.6 C (69.1 F)
Oct40.0 C (104.0 F)-4.4 C (24.1 F)n/an/a
Nov32.2 C (90.0 F)-8.9 C (16.0 F)n/an/a
Dec27.8 C (82.0 F)-11.7 C (10.9 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at San Carlos Rsvr by the year they were set 1,464 records at San Carlos Rsvr still stand. 2015 holds the most, with 39. 0102030401900: 41901: 201902: 91903: 121904: 211905: 131906: 311907: 271908: 221909: 271910: 281911: 211917: 131918: 61919: 61921: 381922: 221923: 241924: 321925: 291926: 81927: 201928: 91930: 81931: 101932: 81933: 171934: 221935: 41936: 61937: 81938: 221939: 91940: 41941: 31942: 41943: 31944: 41945: 111946: 121947: 151948: 71949: 121950: 161951: 121952: 71953: 91954: 61955: 81956: 101957: 111958: 191959: 111960: 21961: 51962: 151963: 41964: 91965: 91966: 91967: 71968: 71969: 51970: 21971: 181972: 111973: 91974: 41975: 181976: 221977: 81978: 161979: 101980: 91981: 61982: 61983: 141984: 111985: 131986: 111987: 161988: 71989: 141990: 191991: 61992: 31993: 31994: 111995: 131996: 141997: 91998: 31999: 32000: 122001: 62002: 72003: 182004: 12005: 162006: 42007: 12009: 32010: 42011: 182012: 22013: 72014: 212015: 392016: 292017: 92018: 62019: 282020: 262021: 32024: 242025: 282026: 311900191719311943195519671979199120032016
1,464 records at San Carlos Rsvr still stand. 2015 holds the most, with 39.
Standing records at San Carlos Rsvr by the year they were set
Year setStanding records
19004
190120
19029
190312
190421
190513
190631
190727
190822
190927
191028
191121
191713
19186
19196
192138
192222
192324
192432
192529
19268
192720
19289
19308
193110
19328
193317
193422
19354
19366
19378
193822
19399
19404
19413
19424
19433
19444
194511
194612
194715
19487
194912
195016
195112
19527
19539
19546
19558
195610
195711
195819
195911
19602
19615
196215
19634
19649
19659
19669
19677
19687
19695
19702
197118
197211
19739
19744
197518
197622
19778
197816
197910
19809
19816
19826
198314
198411
198513
198611
198716
19887
198914
199019
19916
19923
19933
199411
199513
199614
19979
19983
19993
200012
20016
20027
200318
20041
200516
20064
20071
20093
20104
201118
20122
20137
201421
201539
201629
20179
20186
201928
202026
20213
202424
202528
202631

All-Time Record Progression

7 new records
When San Carlos Rsvr set new all-time records 7 all-time records were set at San Carlos Rsvr between 4 January 1949 and 29 December 2019. Each dot is a new record. Record low maximum temperatureRecord daily precipitationRecord daily snowfallRecord high maximum temperatureRecord high minimum temperature4 January 1949: Record low maximum temperature 1.1 C (34.0 F)23 March 1954: Record daily precipitation 86.4 mm (3.4 in)11 January 1962: Record low maximum temperature 0.6 C (33.1 F)4 February 1985: Record daily snowfall 20.3 cm (8.0 in)25 August 1985: Record high maximum temperature 46.7 C (116.1 F)23 June 1988: Record high minimum temperature 31.7 C (89.1 F)29 December 2019: Record low maximum temperature 0.0 C (32.0 F)19501960197019801990200020102020
7 all-time records were set at San Carlos Rsvr between 4 January 1949 and 29 December 2019. Each dot is a new record.
When San Carlos Rsvr set new all-time records
DateKindDetail
1949-01-04Record low maximum temperatureRecord low maximum temperature 1.1 C (34.0 F)
1954-03-23Record daily precipitationRecord daily precipitation 86.4 mm (3.4 in)
1962-01-11Record low maximum temperatureRecord low maximum temperature 0.6 C (33.1 F)
1985-02-04Record daily snowfallRecord daily snowfall 20.3 cm (8.0 in)
1985-08-25Record high maximum temperatureRecord high maximum temperature 46.7 C (116.1 F)
1988-06-23Record high minimum temperatureRecord high minimum temperature 31.7 C (89.1 F)
2019-12-29Record low maximum temperatureRecord low maximum temperature 0.0 C (32.0 F)

Wettest Day of Each Month

Mar: 86.4 mm (3.4 in)
Record daily precipitation for each month at San Carlos Rsvr The wettest day on record for each calendar month at San Carlos Rsvr. The most was 86.4 mm (3.4 in) on 23 March 1954. 0255075100 Jan: 71.6 mm (2.8 in), 11 January 1993 Jan Feb: 55.1 mm (2.2 in), 8 February 1994 Feb Mar: 86.4 mm (3.4 in), 23 March 1954 Mar Apr: 45.2 mm (1.8 in), 9 April 1935 Apr May: 49.8 mm (2.0 in), 16 May 1993 May Jun: 34.0 mm (1.3 in), 29 June 1938 Jun Jul: 65.5 mm (2.6 in), 23 July 1941 Jul Aug: 73.7 mm (2.9 in), 21 August 1907 Aug Sep: 56.9 mm (2.2 in), 28 September 1941 Sep Oct: 74.2 mm (2.9 in), 2 October 1983 Oct Nov: 56.4 mm (2.2 in), 19 November 1940 Nov Dec: 76.2 mm (3.0 in), 18 December 1978 Dec
The wettest day on record for each calendar month at San Carlos Rsvr. The most was 86.4 mm (3.4 in) on 23 March 1954.
Record daily precipitation for each month at San Carlos Rsvr
MonthRecord daily precipitation (mm)Date
Jan71.6 mm (2.8 in)11 January 1993
Feb55.1 mm (2.2 in)8 February 1994
Mar86.4 mm (3.4 in)23 March 1954
Apr45.2 mm (1.8 in)9 April 1935
May49.8 mm (2.0 in)16 May 1993
Jun34.0 mm (1.3 in)29 June 1938
Jul65.5 mm (2.6 in)23 July 1941
Aug73.7 mm (2.9 in)21 August 1907
Sep56.9 mm (2.2 in)28 September 1941
Oct74.2 mm (2.9 in)2 October 1983
Nov56.4 mm (2.2 in)19 November 1940
Dec76.2 mm (3.0 in)18 December 1978

Period of Record Coverage

1900 to 2026
Days with data per year at San Carlos Rsvr 118 years of record at San Carlos Rsvr, 1900 to 2026. 51 years have data for under 90 percent of days and are left out of rankings: 1900, 1901, 1902, 1903, 1908, 1911, 1917, 1918 and others. 1900: 60 of 365 days1901: 326 of 365 days1902: 173 of 365 days1903: 179 of 365 days1904: 366 of 366 days1905: 364 of 365 days1906: 364 of 365 days1907: 356 of 365 days1908: 284 of 366 days1909: 364 of 365 days1910: 365 of 365 days1911: 274 of 365 days1917: 193 of 365 days1918: 233 of 365 days1919: 47 of 365 days1921: 230 of 365 days1922: 235 of 365 days1923: 234 of 365 days1924: 270 of 366 days1925: 284 of 365 days1926: 280 of 365 days1927: 305 of 365 days1928: 114 of 366 days1930: 111 of 365 days1931: 309 of 365 days1932: 312 of 366 days1933: 308 of 365 days1934: 308 of 365 days1935: 306 of 365 days1936: 310 of 366 days1937: 302 of 365 days1938: 309 of 365 days1939: 308 of 365 days1940: 313 of 366 days1941: 310 of 365 days1942: 309 of 365 days1943: 322 of 365 days1944: 366 of 366 days1945: 365 of 365 days1946: 362 of 365 days1947: 365 of 365 days1948: 365 of 366 days1949: 357 of 365 days1950: 358 of 365 days1951: 355 of 365 days1952: 363 of 366 days1953: 363 of 365 days1954: 362 of 365 days1955: 365 of 365 days1956: 366 of 366 days1957: 359 of 365 days1958: 365 of 365 days1959: 365 of 365 days1960: 357 of 366 days1961: 365 of 365 days1962: 365 of 365 days1963: 365 of 365 days1964: 366 of 366 days1965: 362 of 365 days1966: 365 of 365 days1967: 365 of 365 days1968: 364 of 366 days1969: 365 of 365 days1970: 365 of 365 days1971: 365 of 365 days1972: 366 of 366 days1973: 362 of 365 days1974: 365 of 365 days1975: 365 of 365 days1976: 366 of 366 days1977: 365 of 365 days1978: 365 of 365 days1979: 365 of 365 days1980: 366 of 366 days1981: 365 of 365 days1982: 364 of 365 days1983: 364 of 365 days1984: 366 of 366 days1985: 365 of 365 days1986: 365 of 365 days1987: 365 of 365 days1988: 363 of 366 days1989: 364 of 365 days1990: 364 of 365 days1991: 363 of 365 days1992: 360 of 366 days1993: 364 of 365 days1994: 362 of 365 days1995: 363 of 365 days1996: 312 of 366 days1997: 360 of 365 days1998: 273 of 365 days1999: 212 of 365 days2000: 183 of 366 days2001: 56 of 365 days2002: 364 of 365 days2003: 328 of 365 days2004: 271 of 366 days2005: 240 of 365 days2006: 241 of 365 days2007: 25 of 365 days2008: 31 of 366 days2009: 144 of 365 days2010: 336 of 365 days2011: 317 of 365 days2012: 236 of 366 days2013: 305 of 365 days2014: 353 of 365 days2015: 348 of 365 days2016: 348 of 366 days2017: 350 of 365 days2018: 346 of 365 days2019: 315 of 365 days2020: 258 of 366 days2021: 59 of 365 days2024: 213 of 366 days2025: 345 of 365 days2026: 224 of 365 days19051935195019651980199520102025
118 years of record at San Carlos Rsvr, 1900 to 2026. 51 years have data for under 90 percent of days and are left out of rankings: 1900, 1901, 1902, 1903, 1908, 1911, 1917, 1918 and others.
Days with data per year at San Carlos Rsvr
YearDays with dataShare of yearComplete
19006016%No
190132689%No
190217347%No
190317949%No
1904366100%Yes
1905364100%Yes
1906364100%Yes
190735698%Yes
190828478%No
1909364100%Yes
1910365100%Yes
191127475%No
191719353%No
191823364%No
19194713%No
192123063%No
192223564%No
192323464%No
192427074%No
192528478%No
192628077%No
192730584%No
192811431%No
193011130%No
193130985%No
193231285%No
193330884%No
193430884%No
193530684%No
193631085%No
193730283%No
193830985%No
193930884%No
194031386%No
194131085%No
194230985%No
194332288%No
1944366100%Yes
1945365100%Yes
194636299%Yes
1947365100%Yes
1948365100%Yes
194935798%Yes
195035898%Yes
195135597%Yes
195236399%Yes
195336399%Yes
195436299%Yes
1955365100%Yes
1956366100%Yes
195735998%Yes
1958365100%Yes
1959365100%Yes
196035798%Yes
1961365100%Yes
1962365100%Yes
1963365100%Yes
1964366100%Yes
196536299%Yes
1966365100%Yes
1967365100%Yes
196836499%Yes
1969365100%Yes
1970365100%Yes
1971365100%Yes
1972366100%Yes
197336299%Yes
1974365100%Yes
1975365100%Yes
1976366100%Yes
1977365100%Yes
1978365100%Yes
1979365100%Yes
1980366100%Yes
1981365100%Yes
1982364100%Yes
1983364100%Yes
1984366100%Yes
1985365100%Yes
1986365100%Yes
1987365100%Yes
198836399%Yes
1989364100%Yes
1990364100%Yes
199136399%Yes
199236098%Yes
1993364100%Yes
199436299%Yes
199536399%Yes
199631285%No
199736099%Yes
199827375%No
199921258%No
200018350%No
20015615%No
2002364100%Yes
200332890%No
200427174%No
200524066%No
200624166%No
2007257%No
2008318%No
200914439%No
201033692%Yes
201131787%No
201223664%No
201330584%No
201435397%Yes
201534895%Yes
201634895%Yes
201735096%Yes
201834695%Yes
201931586%No
202025870%No
20215916%No
202421358%No
202534595%Yes
202622461%No

Latest Records

20
Latest records at San Carlos Rsvr
DateStationRecordValueBeat old record byOld record stoodSignificance
20 September 2026San Carlos Rsvr, USdaily high min (Provisional)23.9 C (75.0 F)0.6 C (1.1 F)73 years33 of 100 (Routine)
28 August 2026San Carlos Rsvr, USdaily high max (Provisional)43.3 C (109.9 F)1.1 C (2.0 F)104 years43 of 100 (Notable)
28 August 2026San Carlos Rsvr, USdaily high min (Provisional)28.9 C (84.0 F)3.3 C (5.9 F)48 years34 of 100 (Routine)
27 August 2026San Carlos Rsvr, USdaily high max (Provisional)45.0 C (113.0 F)2.2 C (4.0 F)15 years21 of 100 (Routine)
26 August 2026San Carlos Rsvr, USdaily high max (Provisional)44.4 C (111.9 F)1.6 C (2.9 F)124 years45 of 100 (Notable)
26 August 2026San Carlos Rsvr, USdaily high min (Provisional)26.1 C (79.0 F)0.5 C (0.9 F)32 years20 of 100 (Routine)
24 August 2026San Carlos Rsvr, USdaily high min (Provisional)28.3 C (82.9 F)1.6 C (2.9 F)48 years29 of 100 (Routine)
24 August 2026San Carlos Rsvr, USdaily high max (Provisional)43.3 C (109.9 F)0.5 C (0.9 F)15 years15 of 100 (Routine)
23 August 2026San Carlos Rsvr, USdaily high min (Provisional)27.8 C (82.0 F)2.2 C (4.0 F)96 years45 of 100 (Notable)
23 August 2026San Carlos Rsvr, USdaily high max (Provisional)43.3 C (109.9 F)1.6 C (2.9 F)88 years41 of 100 (Notable)
22 August 2026San Carlos Rsvr, USdaily high min (Provisional)29.4 C (84.9 F)1.6 C (2.9 F)0 years15 of 100 (Routine)
19 August 2026San Carlos Rsvr, USdaily high min (Tie, Provisional)26.7 C (80.1 F)tie1 year2 of 100 (Routine)
10 August 2026San Carlos Rsvr, USdaily high max (Tie)42.8 C (109.0 F)tie99 years9 of 100 (Routine)
8 August 2026San Carlos Rsvr, USdaily high min28.3 C (82.9 F)1.1 C (2.0 F)60 years31 of 100 (Routine)
6 August 2026San Carlos Rsvr, USdaily high min28.9 C (84.0 F)1.1 C (2.0 F)100 years43 of 100 (Notable)
5 August 2026San Carlos Rsvr, USmonthly high min (Tie)30.0 C (86.0 F)tie0 years5 of 100 (Routine)
4 August 2026San Carlos Rsvr, USdaily high min28.9 C (84.0 F)0.6 C (1.1 F)73 years33 of 100 (Routine)
2 August 2026San Carlos Rsvr, USmonthly high min (Tie)30.0 C (86.0 F)tie0 years5 of 100 (Routine)
1 August 2026San Carlos Rsvr, USdaily high min29.4 C (84.9 F)1.6 C (2.9 F)92 years42 of 100 (Notable)
1 August 2026San Carlos Rsvr, USdaily high max44.4 C (111.9 F)0.5 C (0.9 F)53 years27 of 100 (Routine)

Climate Trend

78 complete years, 1904 to 2025
Annual mean temperature at San Carlos Rsvr as warming stripes, 1904 to 2025 One stripe for each of 78 complete years at San Carlos Rsvr, 1904 to 2025. Blue stripes are years cooler than the station's own mean of 18.7 C (65.6 F); red stripes are warmer. The coolest year was 1975, at 16.4 C (61.4 F), and the warmest was 1934, at 21.0 C (69.8 F). The strongest colour marks a difference of 2.4 C (4.3 F). 1904: 18.4 C, -0.3 C from the station mean1905: 18.2 C, -0.5 C from the station mean1906: 18.0 C, -0.7 C from the station mean1907: 18.1 C, -0.6 C from the station mean1909: 17.5 C, -1.2 C from the station mean1910: 18.8 C, +0.1 C from the station mean1931: 18.8 C, +0.1 C from the station mean1932: 19.1 C, +0.4 C from the station mean1933: 19.2 C, +0.5 C from the station mean1934: 21.0 C, +2.3 C from the station mean1935: 18.6 C, -0.1 C from the station mean1936: 19.2 C, +0.5 C from the station mean1938: 17.6 C, -1.1 C from the station mean1939: 19.2 C, +0.5 C from the station mean1940: 19.1 C, +0.4 C from the station mean1941: 17.9 C, -0.8 C from the station mean1942: 18.6 C, -0.1 C from the station mean1943: 19.1 C, +0.4 C from the station mean1944: 17.9 C, -0.8 C from the station mean1945: 18.6 C, -0.1 C from the station mean1946: 18.7 C, 0.0 C from the station mean1947: 18.9 C, +0.3 C from the station mean1948: 18.5 C, -0.2 C from the station mean1949: 18.6 C, -0.1 C from the station mean1950: 19.4 C, +0.7 C from the station mean1951: 18.3 C, -0.4 C from the station mean1952: 18.5 C, -0.2 C from the station mean1953: 18.4 C, -0.3 C from the station mean1954: 19.5 C, +0.8 C from the station mean1955: 18.3 C, -0.4 C from the station mean1956: 18.7 C, 0.0 C from the station mean1957: 18.8 C, +0.2 C from the station mean1958: 19.2 C, +0.5 C from the station mean1959: 19.4 C, +0.7 C from the station mean1960: 18.7 C, 0.0 C from the station mean1961: 18.3 C, -0.4 C from the station mean1962: 18.9 C, +0.3 C from the station mean1963: 18.7 C, 0.0 C from the station mean1964: 17.6 C, -1.1 C from the station mean1965: 18.2 C, -0.5 C from the station mean1966: 18.6 C, -0.1 C from the station mean1967: 18.5 C, -0.1 C from the station mean1968: 18.3 C, -0.4 C from the station mean1969: 18.9 C, +0.2 C from the station mean1970: 18.1 C, -0.5 C from the station mean1971: 17.8 C, -0.9 C from the station mean1972: 18.6 C, -0.1 C from the station mean1973: 18.3 C, -0.4 C from the station mean1974: 18.4 C, -0.3 C from the station mean1975: 16.4 C, -2.3 C from the station mean1976: 17.2 C, -1.5 C from the station mean1977: 19.1 C, +0.4 C from the station mean1978: 19.2 C, +0.6 C from the station mean1979: 18.4 C, -0.2 C from the station mean1980: 19.0 C, +0.3 C from the station mean1981: 19.9 C, +1.2 C from the station mean1982: 18.6 C, -0.1 C from the station mean1983: 18.7 C, 0.0 C from the station mean1984: 18.9 C, +0.2 C from the station mean1985: 18.8 C, +0.1 C from the station mean1986: 19.2 C, +0.6 C from the station mean1987: 18.6 C, 0.0 C from the station mean1990: 19.4 C, +0.7 C from the station mean1991: 18.4 C, -0.3 C from the station mean1992: 18.1 C, -0.6 C from the station mean1993: 17.8 C, -0.9 C from the station mean1994: 19.4 C, +0.7 C from the station mean1995: 19.5 C, +0.8 C from the station mean1996: 20.3 C, +1.6 C from the station mean1997: 19.6 C, +0.9 C from the station mean2002: 20.2 C, +1.5 C from the station mean2010: 18.6 C, -0.1 C from the station mean2014: 18.8 C, +0.1 C from the station mean2015: 16.5 C, -2.1 C from the station mean2016: 18.5 C, -0.2 C from the station mean2017: 18.8 C, +0.2 C from the station mean2018: 19.5 C, +0.8 C from the station mean2025: 20.4 C, +1.7 C from the station mean1904191019201930194019501960197019801990200020102020
One stripe for each of 78 complete years at San Carlos Rsvr, 1904 to 2025. Blue stripes are years cooler than the station's own mean of 18.7 C (65.6 F); red stripes are warmer. The coolest year was 1975, at 16.4 C (61.4 F), and the warmest was 1934, at 21.0 C (69.8 F). The strongest colour marks a difference of 2.4 C (4.3 F).
Annual mean temperature at San Carlos Rsvr as warming stripes, 1904 to 2025
YearAnnual mean temperatureDifference from the station mean
190418.4 C-0.25 C
190518.2 C-0.50 C
190618.0 C-0.66 C
190718.1 C-0.61 C
190917.5 C-1.23 C
191018.8 C+0.13 C
193118.8 C+0.08 C
193219.1 C+0.37 C
193319.2 C+0.54 C
193421.0 C+2.34 C
193518.6 C-0.11 C
193619.2 C+0.53 C
193817.6 C-1.08 C
193919.2 C+0.46 C
194019.1 C+0.42 C
194117.9 C-0.77 C
194218.6 C-0.09 C
194319.1 C+0.44 C
194417.9 C-0.79 C
194518.6 C-0.11 C
194618.7 C-0.04 C
194718.9 C+0.26 C
194818.5 C-0.22 C
194918.6 C-0.09 C
195019.4 C+0.69 C
195118.3 C-0.37 C
195218.5 C-0.23 C
195318.4 C-0.30 C
195419.5 C+0.78 C
195518.3 C-0.42 C
195618.7 C+0.01 C
195718.8 C+0.16 C
195819.2 C+0.52 C
195919.4 C+0.67 C
196018.7 C-0.02 C
196118.3 C-0.36 C
196218.9 C+0.26 C
196318.7 C+0.02 C
196417.6 C-1.09 C
196518.2 C-0.50 C
196618.6 C-0.06 C
196718.5 C-0.14 C
196818.3 C-0.37 C
196918.9 C+0.24 C
197018.1 C-0.54 C
197117.8 C-0.86 C
197218.6 C-0.07 C
197318.3 C-0.40 C
197418.4 C-0.30 C
197516.4 C-2.32 C
197617.2 C-1.50 C
197719.1 C+0.41 C
197819.2 C+0.55 C
197918.4 C-0.24 C
198019.0 C+0.34 C
198119.9 C+1.20 C
198218.6 C-0.13 C
198318.7 C+0.02 C
198418.9 C+0.23 C
198518.8 C+0.08 C
198619.2 C+0.55 C
198718.6 C-0.04 C
199019.4 C+0.69 C
199118.4 C-0.25 C
199218.1 C-0.61 C
199317.8 C-0.87 C
199419.4 C+0.68 C
199519.5 C+0.83 C
199620.3 C+1.58 C
199719.6 C+0.92 C
200220.2 C+1.47 C
201018.6 C-0.06 C
201418.8 C+0.08 C
201516.5 C-2.14 C
201618.5 C-0.15 C
201718.8 C+0.16 C
201819.5 C+0.82 C
202520.4 C+1.67 C

The fitted trend in annual mean temperature here over 1904 to 2025 is 0.04 C (-0.02 to 0.10) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.08 F (-0.03 to 0.18) per decade. The slope is a straight line fitted to 78 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at San Carlos Rsvr
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.04 C (-0.02 to 0.10) per decade0.08 F (-0.03 to 0.18) per decade1904 to 202578Not clearly different from zero
Mean daily maximum-0.07 C (-0.14 to 0.00) per decade-0.12 F (-0.25 to 0.01) per decade1904 to 202578Not clearly different from zero
Mean daily minimum0.2 C (0.1 to 0.2) per decade0.3 F (0.1 to 0.4) per decade1904 to 202578Rise

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

1900 to 2026
Yearly extremes at San Carlos Rsvr: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)46.7 C (116.1 F)198543.3 C (109.9 F)118
Coldest night (TNn)-11.7 C (10.9 F)1903-5.6 C (21.9 F)118
Wettest day (Rx1day)86.4 mm (3.4 in)195437.2 mm (1.5 in)120
Wettest five days (Rx5day)160.2 mm (6.3 in)199354.6 mm (2.1 in)119
Longest dry spell (CDD)145 days192859 days120

Hottest day (TXx)

Hottest day (TXx) at San Carlos Rsvr by year The hottest day of the year at San Carlos Rsvr, 1900 to 2026. The record is 46.7 C (116.1 F) in 1985, marked on the chart; the median year is 43.3 C (109.9 F). 203040501900192019401960198020002020Record: 46.7 C (116.1 F) in 1985
The hottest day of the year at San Carlos Rsvr, 1900 to 2026. The record is 46.7 C (116.1 F) in 1985, marked on the chart; the median year is 43.3 C (109.9 F).
Hottest day (TXx) at San Carlos Rsvr by year
YearHottest day (TXx)
190031.1 C (88.0 F)
190144.4 C (111.9 F)
190246.1 C (115.0 F)
190343.9 C (111.0 F)
190443.9 C (111.0 F)
190545.0 C (113.0 F)
190642.8 C (109.0 F)
190744.4 C (111.9 F)
190842.8 C (109.0 F)
190945.0 C (113.0 F)
191045.0 C (113.0 F)
191145.0 C (113.0 F)
191743.9 C (111.0 F)
191842.8 C (109.0 F)
191935.0 C (95.0 F)
192145.6 C (114.1 F)
192244.4 C (111.9 F)
192342.2 C (108.0 F)
192445.6 C (114.1 F)
192545.0 C (113.0 F)
192642.8 C (109.0 F)
192746.1 C (115.0 F)
192841.1 C (106.0 F)
193041.1 C (106.0 F)
193139.4 C (102.9 F)
193242.2 C (108.0 F)
193343.9 C (111.0 F)
193443.3 C (109.9 F)
193542.8 C (109.0 F)
193645.0 C (113.0 F)
193745.0 C (113.0 F)
193845.0 C (113.0 F)
193943.3 C (109.9 F)
194043.9 C (111.0 F)
194140.6 C (105.1 F)
194241.7 C (107.1 F)
194341.7 C (107.1 F)
194442.2 C (108.0 F)
194542.8 C (109.0 F)
194642.2 C (108.0 F)
194744.4 C (111.9 F)
194842.2 C (108.0 F)
194942.2 C (108.0 F)
195043.3 C (109.9 F)
195142.2 C (108.0 F)
195241.7 C (107.1 F)
195343.3 C (109.9 F)
195442.2 C (108.0 F)
195543.3 C (109.9 F)
195642.8 C (109.0 F)
195743.3 C (109.9 F)
195846.1 C (115.0 F)
195942.8 C (109.0 F)
196044.4 C (111.9 F)
196143.3 C (109.9 F)
196243.9 C (111.0 F)
196342.8 C (109.0 F)
196442.2 C (108.0 F)
196542.8 C (109.0 F)
196642.8 C (109.0 F)
196741.7 C (107.1 F)
196843.3 C (109.9 F)
196943.9 C (111.0 F)
197044.4 C (111.9 F)
197143.9 C (111.0 F)
197243.9 C (111.0 F)
197345.0 C (113.0 F)
197445.0 C (113.0 F)
197542.2 C (108.0 F)
197642.8 C (109.0 F)
197743.3 C (109.9 F)
197842.8 C (109.0 F)
197943.3 C (109.9 F)
198044.4 C (111.9 F)
198142.8 C (109.0 F)
198242.8 C (109.0 F)
198342.2 C (108.0 F)
198442.2 C (108.0 F)
198546.7 C (116.1 F)
198643.3 C (109.9 F)
198741.1 C (106.0 F)
198842.8 C (109.0 F)
198943.9 C (111.0 F)
199046.1 C (115.0 F)
199141.7 C (107.1 F)
199242.8 C (109.0 F)
199343.3 C (109.9 F)
199446.7 C (116.1 F)
199546.7 C (116.1 F)
199642.8 C (109.0 F)
199745.0 C (113.0 F)
199846.1 C (115.0 F)
199941.7 C (107.1 F)
200041.7 C (107.1 F)
200123.9 C (75.0 F)
200243.3 C (109.9 F)
200345.0 C (113.0 F)
200441.7 C (107.1 F)
200542.2 C (108.0 F)
200642.8 C (109.0 F)
200725.6 C (78.1 F)
200821.7 C (71.1 F)
200942.2 C (108.0 F)
201042.8 C (109.0 F)
201143.9 C (111.0 F)
201241.1 C (106.0 F)
201343.3 C (109.9 F)
201441.1 C (106.0 F)
201542.2 C (108.0 F)
201646.1 C (115.0 F)
201746.7 C (116.1 F)
201843.9 C (111.0 F)
201942.8 C (109.0 F)
202043.9 C (111.0 F)
202123.9 C (75.0 F)
2022n/a
2023n/a
202445.0 C (113.0 F)
202545.0 C (113.0 F)
202645.0 C (113.0 F)

Coldest night (TNn)

Coldest night (TNn) at San Carlos Rsvr by year The coldest night of the year at San Carlos Rsvr, 1900 to 2026. The record is -11.7 C (10.9 F) in 1903, marked on the chart; the median year is -5.6 C (21.9 F). -15-10-501900192019401960198020002020Record: -11.7 C (10.9 F) in 1903
The coldest night of the year at San Carlos Rsvr, 1900 to 2026. The record is -11.7 C (10.9 F) in 1903, marked on the chart; the median year is -5.6 C (21.9 F).
Coldest night (TNn) at San Carlos Rsvr by year
YearColdest night (TNn)
1900-7.8 C (18.0 F)
1901-9.4 C (15.1 F)
1902-10.0 C (14.0 F)
1903-11.7 C (10.9 F)
1904-11.1 C (12.0 F)
1905-6.7 C (19.9 F)
1906-6.7 C (19.9 F)
1907-6.7 C (19.9 F)
1908-5.0 C (23.0 F)
1909-10.6 C (12.9 F)
1910-9.4 C (15.1 F)
1911-10.6 C (12.9 F)
1917-5.6 C (21.9 F)
1918-6.7 C (19.9 F)
1919-4.4 C (24.1 F)
1921-8.9 C (16.0 F)
1922-11.1 C (12.0 F)
1923-10.0 C (14.0 F)
1924-7.8 C (18.0 F)
1925-10.6 C (12.9 F)
1926-8.9 C (16.0 F)
1927-6.7 C (19.9 F)
1928-7.8 C (18.0 F)
1930-2.2 C (28.0 F)
1931-2.2 C (28.0 F)
1932-5.6 C (21.9 F)
1933-6.1 C (21.0 F)
1934-3.3 C (26.1 F)
1935-5.0 C (23.0 F)
1936-3.3 C (26.1 F)
1937-8.9 C (16.0 F)
1938-5.6 C (21.9 F)
1939-6.7 C (19.9 F)
1940-3.3 C (26.1 F)
1941-2.8 C (27.0 F)
1942-3.9 C (25.0 F)
1943-2.2 C (28.0 F)
1944-3.3 C (26.1 F)
1945-4.4 C (24.1 F)
1946-6.1 C (21.0 F)
1947-5.0 C (23.0 F)
1948-8.3 C (17.1 F)
1949-8.3 C (17.1 F)
1950-6.1 C (21.0 F)
1951-4.4 C (24.1 F)
1952-3.9 C (25.0 F)
1953-6.7 C (19.9 F)
1954-7.8 C (18.0 F)
1955-5.6 C (21.9 F)
1956-6.1 C (21.0 F)
1957-5.6 C (21.9 F)
1958-4.4 C (24.1 F)
1959-4.4 C (24.1 F)
1960-5.0 C (23.0 F)
1961-3.3 C (26.1 F)
1962-10.0 C (14.0 F)
1963-7.2 C (19.0 F)
1964-7.2 C (19.0 F)
1965-5.6 C (21.9 F)
1966-5.6 C (21.9 F)
1967-4.4 C (24.1 F)
1968-7.2 C (19.0 F)
1969-3.3 C (26.1 F)
1970-5.0 C (23.0 F)
1971-11.7 C (10.9 F)
1972-5.0 C (23.0 F)
1973-2.8 C (27.0 F)
1974-11.1 C (12.0 F)
1975-8.3 C (17.1 F)
1976-8.9 C (16.0 F)
1977-6.7 C (19.9 F)
1978-7.8 C (18.0 F)
1979-6.1 C (21.0 F)
1980-5.0 C (23.0 F)
1981-2.2 C (28.0 F)
1982-2.8 C (27.0 F)
1983-3.3 C (26.1 F)
1984-2.2 C (28.0 F)
1985-4.4 C (24.1 F)
1986-2.2 C (28.0 F)
1987-5.6 C (21.9 F)
1988-4.4 C (24.1 F)
1989-5.6 C (21.9 F)
1990-5.6 C (21.9 F)
1991-3.9 C (25.0 F)
1992-5.0 C (23.0 F)
1993-3.3 C (26.1 F)
1994-3.3 C (26.1 F)
1995-2.8 C (27.0 F)
1996-5.0 C (23.0 F)
1997-3.9 C (25.0 F)
1998-3.3 C (26.1 F)
1999-3.9 C (25.0 F)
2000-3.9 C (25.0 F)
2001-3.9 C (25.0 F)
2002-4.4 C (24.1 F)
2003-6.1 C (21.0 F)
2004-5.0 C (23.0 F)
2005-3.3 C (26.1 F)
2006-2.8 C (27.0 F)
2007-6.7 C (19.9 F)
2008-4.4 C (24.1 F)
2009-6.7 C (19.9 F)
2010-6.1 C (21.0 F)
2011-11.7 C (10.9 F)
2012-2.8 C (27.0 F)
2013-6.1 C (21.0 F)
2014-3.9 C (25.0 F)
2015-7.2 C (19.0 F)
2016-5.0 C (23.0 F)
2017-5.0 C (23.0 F)
2018-8.9 C (16.0 F)
2019-7.8 C (18.0 F)
2020-6.7 C (19.9 F)
2021-3.3 C (26.1 F)
2022n/a
2023n/a
2024-1.7 C (28.9 F)
2025-4.4 C (24.1 F)
2026-0.6 C (30.9 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at San Carlos Rsvr by year The wettest day of the year at San Carlos Rsvr, 1900 to 2026. The record is 86.4 mm (3.4 in) in 1954, marked on the chart; the median year is 37.2 mm (1.5 in). 0204060801001900192019401960198020002020Record: 86.4 mm (3.4 in) in 1954
The wettest day of the year at San Carlos Rsvr, 1900 to 2026. The record is 86.4 mm (3.4 in) in 1954, marked on the chart; the median year is 37.2 mm (1.5 in).
Wettest day (Rx1day) at San Carlos Rsvr by year
YearWettest day (Rx1day)
190034.3 mm (1.4 in)
190145.7 mm (1.8 in)
190210.2 mm (0.4 in)
190326.7 mm (1.1 in)
190425.4 mm (1.0 in)
190557.2 mm (2.3 in)
190640.6 mm (1.6 in)
190773.7 mm (2.9 in)
190848.3 mm (1.9 in)
190927.9 mm (1.1 in)
191020.3 mm (0.8 in)
191131.2 mm (1.2 in)
191732.5 mm (1.3 in)
191851.8 mm (2.0 in)
191911.4 mm (0.4 in)
192130.5 mm (1.2 in)
192248.8 mm (1.9 in)
192358.4 mm (2.3 in)
192417.3 mm (0.7 in)
192557.2 mm (2.3 in)
192638.6 mm (1.5 in)
192728.7 mm (1.1 in)
192854.6 mm (2.1 in)
193029.2 mm (1.1 in)
193152.8 mm (2.1 in)
193236.8 mm (1.4 in)
193330.5 mm (1.2 in)
193440.9 mm (1.6 in)
193545.2 mm (1.8 in)
193623.9 mm (0.9 in)
193747.5 mm (1.9 in)
193840.6 mm (1.6 in)
193951.6 mm (2.0 in)
194056.4 mm (2.2 in)
194165.5 mm (2.6 in)
194225.9 mm (1.0 in)
194338.6 mm (1.5 in)
194455.6 mm (2.2 in)
194529.2 mm (1.1 in)
194631.8 mm (1.3 in)
194727.9 mm (1.1 in)
194845.7 mm (1.8 in)
194921.6 mm (0.9 in)
195020.8 mm (0.8 in)
195154.4 mm (2.1 in)
195246.0 mm (1.8 in)
195324.9 mm (1.0 in)
195486.4 mm (3.4 in)
195534.8 mm (1.4 in)
195645.0 mm (1.8 in)
195733.0 mm (1.3 in)
195848.3 mm (1.9 in)
195939.1 mm (1.5 in)
196035.6 mm (1.4 in)
196132.0 mm (1.3 in)
196230.7 mm (1.2 in)
196336.6 mm (1.4 in)
196433.8 mm (1.3 in)
196540.1 mm (1.6 in)
196638.9 mm (1.5 in)
196738.4 mm (1.5 in)
196843.9 mm (1.7 in)
196932.8 mm (1.3 in)
197050.8 mm (2.0 in)
197136.8 mm (1.4 in)
197247.8 mm (1.9 in)
197330.7 mm (1.2 in)
197422.9 mm (0.9 in)
197533.0 mm (1.3 in)
197643.2 mm (1.7 in)
197762.2 mm (2.4 in)
197876.2 mm (3.0 in)
197931.2 mm (1.2 in)
198036.6 mm (1.4 in)
198128.7 mm (1.1 in)
198231.8 mm (1.3 in)
198374.2 mm (2.9 in)
198432.0 mm (1.3 in)
198538.6 mm (1.5 in)
198632.3 mm (1.3 in)
198739.4 mm (1.6 in)
198835.3 mm (1.4 in)
198937.8 mm (1.5 in)
199050.8 mm (2.0 in)
199141.1 mm (1.6 in)
199249.5 mm (1.9 in)
199371.6 mm (2.8 in)
199455.1 mm (2.2 in)
199523.9 mm (0.9 in)
199631.5 mm (1.2 in)
199753.3 mm (2.1 in)
199826.7 mm (1.1 in)
19996.4 mm (0.25 in)
200050.3 mm (2.0 in)
200110.4 mm (0.4 in)
200215.2 mm (0.6 in)
200330.0 mm (1.2 in)
200434.8 mm (1.4 in)
200542.4 mm (1.7 in)
200637.1 mm (1.5 in)
20079.7 mm (0.38 in)
200813.5 mm (0.5 in)
200924.4 mm (1.0 in)
201038.1 mm (1.5 in)
201124.4 mm (1.0 in)
201249.0 mm (1.9 in)
201320.8 mm (0.8 in)
201427.9 mm (1.1 in)
201539.9 mm (1.6 in)
201633.8 mm (1.3 in)
201740.6 mm (1.6 in)
201844.5 mm (1.8 in)
201941.9 mm (1.6 in)
202033.0 mm (1.3 in)
202140.6 mm (1.6 in)
202237.3 mm (1.5 in)
202339.4 mm (1.6 in)
202438.9 mm (1.5 in)
202538.6 mm (1.5 in)
202615.2 mm (0.6 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at San Carlos Rsvr by year The wettest five days of the year at San Carlos Rsvr, 1900 to 2026. The record is 160.2 mm (6.3 in) in 1993, marked on the chart; the median year is 54.6 mm (2.1 in). 0501001502001900192019401960198020002020Record: 160.2 mm (6.3 in) in 1993
The wettest five days of the year at San Carlos Rsvr, 1900 to 2026. The record is 160.2 mm (6.3 in) in 1993, marked on the chart; the median year is 54.6 mm (2.1 in).
Wettest five days (Rx5day) at San Carlos Rsvr by year
YearWettest five days (Rx5day)
190072.7 mm (2.9 in)
190160.9 mm (2.4 in)
190215.3 mm (0.6 in)
190333.0 mm (1.3 in)
190430.0 mm (1.2 in)
190582.6 mm (3.3 in)
190660.2 mm (2.4 in)
1907130.3 mm (5.1 in)
190884.9 mm (3.3 in)
190932.5 mm (1.3 in)
191029.4 mm (1.2 in)
191152.8 mm (2.1 in)
191765.1 mm (2.6 in)
191855.6 mm (2.2 in)
191911.4 mm (0.4 in)
192145.5 mm (1.8 in)
192248.8 mm (1.9 in)
1923n/a
192437.8 mm (1.5 in)
192526.4 mm (1.0 in)
192639.6 mm (1.6 in)
192737.1 mm (1.5 in)
192854.6 mm (2.1 in)
193058.1 mm (2.3 in)
193155.6 mm (2.2 in)
193267.0 mm (2.6 in)
193352.1 mm (2.1 in)
193445.9 mm (1.8 in)
193569.3 mm (2.7 in)
193649.4 mm (1.9 in)
193750.3 mm (2.0 in)
193866.1 mm (2.6 in)
193951.6 mm (2.0 in)
194067.6 mm (2.7 in)
1941113.1 mm (4.5 in)
194234.1 mm (1.3 in)
194360.7 mm (2.4 in)
194467.8 mm (2.7 in)
194542.2 mm (1.7 in)
194659.2 mm (2.3 in)
194747.5 mm (1.9 in)
194881.3 mm (3.2 in)
194930.8 mm (1.2 in)
195036.3 mm (1.4 in)
195154.4 mm (2.1 in)
195270.9 mm (2.8 in)
195341.2 mm (1.6 in)
1954129.9 mm (5.1 in)
195547.0 mm (1.9 in)
195650.6 mm (2.0 in)
195747.0 mm (1.9 in)
195857.7 mm (2.3 in)
195956.4 mm (2.2 in)
196056.5 mm (2.2 in)
196143.9 mm (1.7 in)
196243.4 mm (1.7 in)
196376.7 mm (3.0 in)
196470.2 mm (2.8 in)
196582.5 mm (3.2 in)
196679.8 mm (3.1 in)
1967112.8 mm (4.4 in)
196857.1 mm (2.2 in)
196936.9 mm (1.5 in)
197092.2 mm (3.6 in)
197163.8 mm (2.5 in)
197273.8 mm (2.9 in)
197341.6 mm (1.6 in)
197438.7 mm (1.5 in)
197538.1 mm (1.5 in)
197651.9 mm (2.0 in)
197762.5 mm (2.5 in)
1978126.7 mm (5.0 in)
197956.2 mm (2.2 in)
198085.1 mm (3.4 in)
198154.3 mm (2.1 in)
198243.0 mm (1.7 in)
1983158.5 mm (6.2 in)
198458.7 mm (2.3 in)
198545.2 mm (1.8 in)
198667.0 mm (2.6 in)
198752.4 mm (2.1 in)
198864.5 mm (2.5 in)
198941.9 mm (1.6 in)
199096.3 mm (3.8 in)
199171.6 mm (2.8 in)
199278.4 mm (3.1 in)
1993160.2 mm (6.3 in)
199468.0 mm (2.7 in)
199538.3 mm (1.5 in)
199657.7 mm (2.3 in)
199762.2 mm (2.4 in)
199839.6 mm (1.6 in)
19996.4 mm (0.25 in)
200071.7 mm (2.8 in)
200116.0 mm (0.6 in)
200223.1 mm (0.9 in)
200363.6 mm (2.5 in)
200442.7 mm (1.7 in)
200568.8 mm (2.7 in)
200640.9 mm (1.6 in)
200715.8 mm (0.6 in)
200827.0 mm (1.1 in)
200924.4 mm (1.0 in)
201040.6 mm (1.6 in)
201137.0 mm (1.5 in)
201252.8 mm (2.1 in)
201343.9 mm (1.7 in)
201451.5 mm (2.0 in)
201547.3 mm (1.9 in)
201664.1 mm (2.5 in)
201769.6 mm (2.7 in)
201857.2 mm (2.3 in)
201975.7 mm (3.0 in)
202043.4 mm (1.7 in)
202156.2 mm (2.2 in)
202246.0 mm (1.8 in)
202368.3 mm (2.7 in)
202459.8 mm (2.4 in)
202578.3 mm (3.1 in)
202627.2 mm (1.1 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at San Carlos Rsvr by year The longest dry spell of the year at San Carlos Rsvr, 1900 to 2026. The record is 145 days in 1928, marked on the chart; the median year is 59 days. 0501001501900192019401960198020002020Record: 145 days in 1928
The longest dry spell of the year at San Carlos Rsvr, 1900 to 2026. The record is 145 days in 1928, marked on the chart; the median year is 59 days.
Longest dry spell (CDD) at San Carlos Rsvr by year
YearLongest dry spell (CDD)
190042 days
190153 days
190254 days
190363 days
190471 days
190535 days
190646 days
190746 days
190839 days
190996 days
191082 days
191178 days
191736 days
191885 days
191931 days
192188 days
192228 days
19232 days
192477 days
192525 days
192636 days
192748 days
1928145 days
193034 days
193140 days
193262 days
193350 days
193439 days
193560 days
193649 days
193765 days
1938105 days
193985 days
194029 days
194132 days
194262 days
194396 days
194451 days
194583 days
194686 days
194763 days
1948120 days
194944 days
195047 days
195159 days
195248 days
195361 days
195476 days
1955105 days
195664 days
195735 days
195850 days
195967 days
196060 days
1961111 days
196296 days
196367 days
196476 days
196573 days
196685 days
196748 days
196855 days
196965 days
197079 days
197191 days
1972143 days
197386 days
197459 days
197576 days
197651 days
197749 days
197851 days
197941 days
198095 days
198155 days
198257 days
198341 days
198483 days
198573 days
198670 days
198755 days
198868 days
1989104 days
199045 days
199169 days
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199459 days
199580 days
199678 days
199733 days
199845 days
199961 days
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200342 days
200480 days
200533 days
200662 days
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200943 days
201048 days
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201352 days
201468 days
201531 days
201680 days
201784 days
201844 days
201945 days
202030 days
202164 days
202280 days
202363 days
202475 days
202565 days
202655 days

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

77 years with a frost

Across 77 years with a frost, the median last spring frost at San Carlos Rsvr falls on 6 March and the median first autumn frost on 24 November, which leaves a median of 271 days between them.

In 1973 to 2018 the median growing season was 276 days. That is 17 days more than in 1904 to 1955.

Fitted over all years, the growing season changes by +3.6 days per decade at this station.

Frost dates and growing season at San Carlos Rsvr
MeasureMedian, all yearsEarliest period (1904 to 1955)Recent period (1973 to 2018)Recent against earliestFitted trend
Last spring frost6 March14 March24 February18 days earlier-2.7 days per decade
First autumn frost24 November21 November26 November5 days later+0.9 days per decade
Growing days271 days259 days276 days17 days more+3.6 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.

Rainfall Return Levels

93 years, 1901 to 2025

A day with at least 37.6 mm (1.5 in) of rain is expected about once in 2 years. A day with at least 82.3 mm (3.2 in) of rain is expected about once in 100 years.

Rainfall return levels at San Carlos Rsvr: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years37.6 mm (1.5 in)
5 years49.4 mm (1.9 in)
10 years57.3 mm (2.3 in)
25 years67.3 mm (2.6 in)
50 years74.8 mm (2.9 in)
100 years82.3 mm (3.2 in)Longer than the 93 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 93 years of values from 1901 to 2025.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 86.4 mm (3.4 in) in 1954; 76.2 mm (3.0 in) in 1978; 74.2 mm (2.9 in) in 1983.

Station Changes

No change in the annual mean temperature of this station was found against its neighbours.

Download the Data

  • Data for San Carlos Rsvr standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for San Carlos Rsvr 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).