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San Francisco Weather Records (MXN00024066)

Record envelope, standing records and threshold days for San Francisco (MXN00024066), Mexico, with 51 years of record.

Key Facts for San Francisco

  • San Francisco (MXN00024066) is a weather station in Mexico at 22.07 latitude and -99.85 longitude, 1,013 m (3,323 ft) above sea level.
  • The station reports from 1961 to 2011, 51 years of record.
  • 1,464 records set at San Francisco still stand.
  • Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
  • San Francisco set a daily record precipitation of 46.0 mm (1.8 in) on 30 June 2011.

About the Station

  • Location: Mexico, 22.07 latitude, -99.85 longitude.
  • Elevation: 1,013 m (3,323 ft).
  • Period of record: 1961 to 2011, 51 years.
  • Eligible elements: tmax, tmin, prcp.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at San Francisco, with 2026 drawn through them The band shows the record high and record low for each calendar day at San Francisco. The lines show the 2026 daily maximum and minimum. 0 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 Francisco. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at San Francisco, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan36.7 C (98.1 F)-6.1 C (21.0 F)n/an/a
Feb40.0 C (104.0 F)-8.3 C (17.1 F)n/an/a
Mar42.8 C (109.0 F)-3.3 C (26.1 F)n/an/a
Apr45.0 C (113.0 F)-1.7 C (28.9 F)n/an/a
May45.0 C (113.0 F)6.7 C (44.1 F)n/an/a
Jun45.0 C (113.0 F)10.0 C (50.0 F)n/an/a
Jul43.9 C (111.0 F)10.0 C (50.0 F)n/an/a
Aug40.6 C (105.1 F)10.0 C (50.0 F)n/an/a
Sep36.7 C (98.1 F)5.0 C (41.0 F)n/an/a
Oct38.9 C (102.0 F)0.6 C (33.1 F)n/an/a
Nov35.6 C (96.1 F)-7.2 C (19.0 F)n/an/a
Dec35.6 C (96.1 F)-8.3 C (17.1 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at San Francisco by the year they were set 1,464 records at San Francisco still stand. 1971 holds the most, with 71. 0204060801961: 591962: 571963: 391964: 511965: 321966: 231967: 261968: 591969: 501970: 601971: 711972: 571973: 381974: 471975: 271976: 381977: 271978: 271979: 391980: 211981: 281982: 151983: 211984: 221987: 341988: 171989: 311990: 231991: 221992: 321993: 181994: 221995: 261996: 241997: 201998: 201999: 132000: 82001: 72002: 152003: 32004: 112005: 92006: 112007: 222008: 462009: 622010: 341961196619711976198119881993199820032008
1,464 records at San Francisco still stand. 1971 holds the most, with 71.
Standing records at San Francisco by the year they were set
Year setStanding records
196159
196257
196339
196451
196532
196623
196726
196859
196950
197060
197171
197257
197338
197447
197527
197638
197727
197827
197939
198021
198128
198215
198321
198422
198734
198817
198931
199023
199122
199232
199318
199422
199526
199624
199720
199820
199913
20008
20017
200215
20033
200411
20059
200611
200722
200846
200962
201034

Wettest Day of Each Month

Sep: 134.9 mm (5.3 in)
Record daily precipitation for each month at San Francisco The wettest day on record for each calendar month at San Francisco. The most was 134.9 mm (5.3 in) on 12 September 1990. 050100150 Jan: 18.8 mm (0.7 in), 30 January 1972 Jan Feb: 31.8 mm (1.3 in), 25 February 2005 Feb Mar: 24.9 mm (1.0 in), 25 March 1996 Mar Apr: 45.0 mm (1.8 in), 29 April 1981 Apr May: 47.8 mm (1.9 in), 14 May 1997 May Jun: 86.9 mm (3.4 in), 23 June 2011 Jun Jul: 111.3 mm (4.4 in), 30 July 1968 Jul Aug: 86.4 mm (3.4 in), 7 August 1990 Aug Sep: 134.9 mm (5.3 in), 12 September 1990 Sep Oct: 83.8 mm (3.3 in), 10 October 1966 Oct Nov: 21.8 mm (0.9 in), 10 November 1967 Nov Dec: 41.9 mm (1.6 in), 3 December 1979 Dec
The wettest day on record for each calendar month at San Francisco. The most was 134.9 mm (5.3 in) on 12 September 1990.
Record daily precipitation for each month at San Francisco
MonthRecord daily precipitation (mm)Date
Jan18.8 mm (0.7 in)30 January 1972
Feb31.8 mm (1.3 in)25 February 2005
Mar24.9 mm (1.0 in)25 March 1996
Apr45.0 mm (1.8 in)29 April 1981
May47.8 mm (1.9 in)14 May 1997
Jun86.9 mm (3.4 in)23 June 2011
Jul111.3 mm (4.4 in)30 July 1968
Aug86.4 mm (3.4 in)7 August 1990
Sep134.9 mm (5.3 in)12 September 1990
Oct83.8 mm (3.3 in)10 October 1966
Nov21.8 mm (0.9 in)10 November 1967
Dec41.9 mm (1.6 in)3 December 1979

Period of Record Coverage

1961 to 2010
Days with data per year at San Francisco 48 years of record at San Francisco, 1961 to 2010. 7 years have data for under 90 percent of days and are left out of rankings: 1965, 1967, 1968, 1981, 1993, 1997, 2010. 1961: 365 of 365 days1962: 365 of 365 days1963: 333 of 365 days1964: 364 of 366 days1965: 301 of 365 days1966: 364 of 365 days1967: 321 of 365 days1968: 302 of 366 days1969: 331 of 365 days1970: 364 of 365 days1971: 365 of 365 days1972: 365 of 366 days1973: 365 of 365 days1974: 365 of 365 days1975: 364 of 365 days1976: 359 of 366 days1977: 333 of 365 days1978: 364 of 365 days1979: 363 of 365 days1980: 350 of 366 days1981: 313 of 365 days1982: 364 of 365 days1983: 365 of 365 days1984: 334 of 366 days1987: 334 of 365 days1988: 366 of 366 days1989: 365 of 365 days1990: 365 of 365 days1991: 364 of 365 days1992: 366 of 366 days1993: 302 of 365 days1994: 365 of 365 days1995: 364 of 365 days1996: 363 of 366 days1997: 301 of 365 days1998: 365 of 365 days1999: 365 of 365 days2000: 366 of 366 days2001: 365 of 365 days2002: 365 of 365 days2003: 332 of 365 days2004: 364 of 366 days2005: 360 of 365 days2006: 364 of 365 days2007: 364 of 365 days2008: 366 of 366 days2009: 365 of 365 days2010: 209 of 365 days19701980199020002010
48 years of record at San Francisco, 1961 to 2010. 7 years have data for under 90 percent of days and are left out of rankings: 1965, 1967, 1968, 1981, 1993, 1997, 2010.
Days with data per year at San Francisco
YearDays with dataShare of yearComplete
1961365100%Yes
1962365100%Yes
196333391%Yes
196436499%Yes
196530182%No
1966364100%Yes
196732188%No
196830283%No
196933191%Yes
1970364100%Yes
1971365100%Yes
1972365100%Yes
1973365100%Yes
1974365100%Yes
1975364100%Yes
197635998%Yes
197733391%Yes
1978364100%Yes
197936399%Yes
198035096%Yes
198131386%No
1982364100%Yes
1983365100%Yes
198433491%Yes
198733492%Yes
1988366100%Yes
1989365100%Yes
1990365100%Yes
1991364100%Yes
1992366100%Yes
199330283%No
1994365100%Yes
1995364100%Yes
199636399%Yes
199730182%No
1998365100%Yes
1999365100%Yes
2000366100%Yes
2001365100%Yes
2002365100%Yes
200333291%Yes
200436499%Yes
200536099%Yes
2006364100%Yes
2007364100%Yes
2008366100%Yes
2009365100%Yes
201020957%No

Latest Records

20
Latest records at San Francisco
DateStationRecordValueBeat old record byOld record stoodSignificance
30 June 2011San Francisco, MXdaily rain46.0 mm (1.8 in)33.6 mm (1.3 in)20 years48 of 100 (Notable)
23 June 2011San Francisco, MXmonthly rain86.9 mm (3.4 in)41.4 mm (1.6 in)7 years57 of 100 (Notable)
25 September 2010San Francisco, MXdaily rain39.9 mm (1.6 in)12.0 mm (0.5 in)40 years24 of 100 (Routine)
17 September 2010San Francisco, MXdaily rain39.9 mm (1.6 in)28.0 mm (1.1 in)29 years29 of 100 (Routine)
28 July 2010San Francisco, MXdaily rain22.9 mm (0.9 in)4.1 mm (0.16 in)32 years17 of 100 (Routine)
27 July 2010San Francisco, MXdaily low max (Tie)25.6 C (78.1 F)tie20 years2 of 100 (Routine)
25 July 2010San Francisco, MXdaily rain19.8 mm (0.8 in)8.9 mm (0.35 in)13 years15 of 100 (Routine)
24 July 2010San Francisco, MXdaily low max25.6 C (78.1 F)1.1 C (2.0 F)36 years19 of 100 (Routine)
23 July 2010San Francisco, MXdaily rain36.8 mm (1.4 in)15.0 mm (0.6 in)36 years27 of 100 (Routine)
22 July 2010San Francisco, MXdaily rain10.9 mm (0.4 in)6.1 mm (0.24 in)37 years20 of 100 (Routine)
21 July 2010San Francisco, MXdaily high min (Tie)20.0 C (68.0 F)tie41 years4 of 100 (Routine)
15 July 2010San Francisco, MXdaily low max21.7 C (71.1 F)3.3 C (5.9 F)25 years21 of 100 (Routine)
14 July 2010San Francisco, MXdaily low max21.7 C (71.1 F)3.3 C (5.9 F)28 years22 of 100 (Routine)
13 July 2010San Francisco, MXdaily low max21.7 C (71.1 F)1.1 C (2.0 F)36 years18 of 100 (Routine)
11 July 2010San Francisco, MXdaily low max21.7 C (71.1 F)2.2 C (4.0 F)33 years21 of 100 (Routine)
10 July 2010San Francisco, MXdaily low max21.7 C (71.1 F)3.3 C (5.9 F)33 years24 of 100 (Routine)
10 July 2010San Francisco, MXdaily rain22.9 mm (0.9 in)11.0 mm (0.4 in)33 years20 of 100 (Routine)
9 July 2010San Francisco, MXdaily low max21.7 C (71.1 F)2.2 C (4.0 F)1 year11 of 100 (Routine)
8 July 2010San Francisco, MXdaily low max21.7 C (71.1 F)1.1 C (2.0 F)1 year8 of 100 (Routine)
7 July 2010San Francisco, MXdaily low max21.7 C (71.1 F)1.1 C (2.0 F)33 years18 of 100 (Routine)

Climate Trend

34 complete years, 1961 to 2009
Annual mean temperature at San Francisco as warming stripes, 1961 to 2009 One stripe for each of 34 complete years at San Francisco, 1961 to 2009. Blue stripes are years cooler than the station's own mean of 21.2 C (70.2 F); red stripes are warmer. The coolest year was 1976, at 20.1 C (68.2 F), and the warmest was 2009, at 22.2 C (71.9 F). The strongest colour marks a difference of 1.2 C (2.2 F). 1961: 20.6 C, -0.7 C from the station mean1962: 21.4 C, +0.1 C from the station mean1964: 22.0 C, +0.8 C from the station mean1966: 20.4 C, -0.9 C from the station mean1970: 21.1 C, -0.1 C from the station mean1971: 21.8 C, +0.6 C from the station mean1972: 22.1 C, +0.9 C from the station mean1973: 21.3 C, +0.1 C from the station mean1974: 21.1 C, -0.2 C from the station mean1975: 21.1 C, -0.2 C from the station mean1976: 20.1 C, -1.1 C from the station mean1978: 21.2 C, 0.0 C from the station mean1979: 20.8 C, -0.4 C from the station mean1980: 21.2 C, 0.0 C from the station mean1982: 21.2 C, -0.1 C from the station mean1983: 20.8 C, -0.4 C from the station mean1988: 21.3 C, 0.0 C from the station mean1989: 21.2 C, -0.1 C from the station mean1990: 21.3 C, +0.1 C from the station mean1991: 21.2 C, 0.0 C from the station mean1994: 21.8 C, +0.6 C from the station mean1995: 22.2 C, +1.0 C from the station mean1996: 21.1 C, -0.2 C from the station mean1998: 21.9 C, +0.7 C from the station mean1999: 20.5 C, -0.7 C from the station mean2000: 21.3 C, 0.0 C from the station mean2001: 20.8 C, -0.4 C from the station mean2002: 20.8 C, -0.4 C from the station mean2004: 21.2 C, 0.0 C from the station mean2005: 21.2 C, 0.0 C from the station mean2006: 21.6 C, +0.3 C from the station mean2007: 21.2 C, -0.1 C from the station mean2008: 21.2 C, -0.1 C from the station mean2009: 22.2 C, +1.0 C from the station mean1961196519701975198019851990199520002005
One stripe for each of 34 complete years at San Francisco, 1961 to 2009. Blue stripes are years cooler than the station's own mean of 21.2 C (70.2 F); red stripes are warmer. The coolest year was 1976, at 20.1 C (68.2 F), and the warmest was 2009, at 22.2 C (71.9 F). The strongest colour marks a difference of 1.2 C (2.2 F).
Annual mean temperature at San Francisco as warming stripes, 1961 to 2009
YearAnnual mean temperatureDifference from the station mean
196120.6 C-0.66 C
196221.4 C+0.12 C
196422.0 C+0.78 C
196620.4 C-0.89 C
197021.1 C-0.11 C
197121.8 C+0.58 C
197222.1 C+0.89 C
197321.3 C+0.09 C
197421.1 C-0.18 C
197521.1 C-0.17 C
197620.1 C-1.11 C
197821.2 C-0.01 C
197920.8 C-0.41 C
198021.2 C-0.05 C
198221.2 C-0.06 C
198320.8 C-0.45 C
198821.3 C+0.02 C
198921.2 C-0.06 C
199021.3 C+0.06 C
199121.2 C-0.03 C
199421.8 C+0.59 C
199522.2 C+0.95 C
199621.1 C-0.19 C
199821.9 C+0.66 C
199920.5 C-0.72 C
200021.3 C+0.04 C
200120.8 C-0.43 C
200220.8 C-0.40 C
200421.2 C+0.00 C
200521.2 C+0.00 C
200621.6 C+0.31 C
200721.2 C-0.06 C
200821.2 C-0.09 C
200922.2 C+0.95 C

The fitted trend in annual mean temperature here over 1961 to 2009 is 0.1 C (-0.1 to 0.2) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.1 to 0.3) per decade. The slope is a straight line fitted to 34 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at San Francisco
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.1 C (-0.1 to 0.2) per decade0.1 F (-0.1 to 0.3) per decade1961 to 200934Not clearly different from zero
Mean daily maximum-0.1 C (-0.3 to 0.1) per decade-0.2 F (-0.5 to 0.2) per decade1961 to 200934Not clearly different from zero
Mean daily minimum0.2 C (0.1 to 0.3) per decade0.3 F (0.1 to 0.6) per decade1961 to 200934Rise

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

1961 to 2011
Yearly extremes at San Francisco: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)45.0 C (113.0 F)197140.6 C (105.1 F)48
Coldest night (TNn)-8.3 C (17.1 F)1976-2.2 C (28.0 F)48
Wettest day (Rx1day)134.9 mm (5.3 in)199041.9 mm (1.6 in)49
Wettest five days (Rx5day)346.3 mm (13.6 in)199077.4 mm (3.0 in)49
Longest dry spell (CDD)195 days199884 days49

Hottest day (TXx)

Hottest day (TXx) at San Francisco by year The hottest day of the year at San Francisco, 1961 to 2011. The record is 45.0 C (113.0 F) in 1971, marked on the chart; the median year is 40.6 C (105.1 F). 3537.54042.54519701980199020002010Record: 45.0 C (113.0 F) in 1971
The hottest day of the year at San Francisco, 1961 to 2011. The record is 45.0 C (113.0 F) in 1971, marked on the chart; the median year is 40.6 C (105.1 F).
Hottest day (TXx) at San Francisco by year
YearHottest day (TXx)
196141.7 C (107.1 F)
196241.7 C (107.1 F)
196340.0 C (104.0 F)
196442.8 C (109.0 F)
196540.0 C (104.0 F)
196638.9 C (102.0 F)
196741.7 C (107.1 F)
196838.9 C (102.0 F)
196941.7 C (107.1 F)
197042.8 C (109.0 F)
197145.0 C (113.0 F)
197240.6 C (105.1 F)
197343.9 C (111.0 F)
197441.7 C (107.1 F)
197540.6 C (105.1 F)
197640.6 C (105.1 F)
197740.0 C (104.0 F)
197840.6 C (105.1 F)
197940.6 C (105.1 F)
198041.7 C (107.1 F)
198141.7 C (107.1 F)
198240.0 C (104.0 F)
198340.6 C (105.1 F)
198440.6 C (105.1 F)
198738.9 C (102.0 F)
198840.0 C (104.0 F)
198942.8 C (109.0 F)
199045.0 C (113.0 F)
199141.7 C (107.1 F)
199238.9 C (102.0 F)
199340.6 C (105.1 F)
199438.9 C (102.0 F)
199542.8 C (109.0 F)
199640.6 C (105.1 F)
199737.8 C (100.0 F)
199843.9 C (111.0 F)
199940.0 C (104.0 F)
200040.0 C (104.0 F)
200140.0 C (104.0 F)
200237.8 C (100.0 F)
200340.0 C (104.0 F)
200438.9 C (102.0 F)
200537.8 C (100.0 F)
200636.7 C (98.1 F)
200738.9 C (102.0 F)
200845.0 C (113.0 F)
200945.0 C (113.0 F)
201045.0 C (113.0 F)
2011n/a

Coldest night (TNn)

Coldest night (TNn) at San Francisco by year The coldest night of the year at San Francisco, 1961 to 2011. The record is -8.3 C (17.1 F) in 1976, marked on the chart; the median year is -2.2 C (28.0 F). -10-7.5-5-2.502.519701980199020002010Record: -8.3 C (17.1 F) in 1976
The coldest night of the year at San Francisco, 1961 to 2011. The record is -8.3 C (17.1 F) in 1976, marked on the chart; the median year is -2.2 C (28.0 F).
Coldest night (TNn) at San Francisco by year
YearColdest night (TNn)
19610.6 C (33.1 F)
1962-1.1 C (30.0 F)
1963-3.3 C (26.1 F)
1964-3.3 C (26.1 F)
1965-2.2 C (28.0 F)
1966-7.2 C (19.0 F)
1967-2.2 C (28.0 F)
19680.6 C (33.1 F)
1969-0.6 C (30.9 F)
1970-3.3 C (26.1 F)
1971-3.3 C (26.1 F)
1972-2.2 C (28.0 F)
1973-6.1 C (21.0 F)
1974-5.0 C (23.0 F)
1975-5.0 C (23.0 F)
1976-8.3 C (17.1 F)
1977-6.1 C (21.0 F)
1978-1.1 C (30.0 F)
1979-3.3 C (26.1 F)
1980-1.1 C (30.0 F)
1981-2.2 C (28.0 F)
1982-4.4 C (24.1 F)
1983-2.2 C (28.0 F)
19840.6 C (33.1 F)
1987-3.3 C (26.1 F)
1988-0.6 C (30.9 F)
1989-2.2 C (28.0 F)
1990-0.6 C (30.9 F)
1991-1.1 C (30.0 F)
1992-1.1 C (30.0 F)
1993-3.3 C (26.1 F)
1994-4.4 C (24.1 F)
1995-0.6 C (30.9 F)
1996-4.4 C (24.1 F)
1997-8.3 C (17.1 F)
1998-1.1 C (30.0 F)
1999-3.3 C (26.1 F)
2000-5.0 C (23.0 F)
2001-1.1 C (30.0 F)
2002-2.2 C (28.0 F)
2003-2.2 C (28.0 F)
2004-4.4 C (24.1 F)
2005-5.0 C (23.0 F)
2006-3.3 C (26.1 F)
2007-1.1 C (30.0 F)
2008-3.3 C (26.1 F)
2009-1.1 C (30.0 F)
20100.0 C (32.0 F)
2011n/a

Wettest day (Rx1day)

Wettest day (Rx1day) at San Francisco by year The wettest day of the year at San Francisco, 1961 to 2011. The record is 134.9 mm (5.3 in) in 1990, marked on the chart; the median year is 41.9 mm (1.6 in). 05010015019701980199020002010Record: 134.9 mm (5.3 in) in 1990
The wettest day of the year at San Francisco, 1961 to 2011. The record is 134.9 mm (5.3 in) in 1990, marked on the chart; the median year is 41.9 mm (1.6 in).
Wettest day (Rx1day) at San Francisco by year
YearWettest day (Rx1day)
196115.0 mm (0.6 in)
196224.9 mm (1.0 in)
196311.9 mm (0.5 in)
196411.9 mm (0.5 in)
19656.9 mm (0.27 in)
196683.8 mm (3.3 in)
196739.9 mm (1.6 in)
1968111.3 mm (4.4 in)
196941.9 mm (1.6 in)
197035.8 mm (1.4 in)
197152.8 mm (2.1 in)
197220.8 mm (0.8 in)
197356.9 mm (2.2 in)
197441.9 mm (1.6 in)
197542.9 mm (1.7 in)
197625.9 mm (1.0 in)
197778.0 mm (3.1 in)
197856.9 mm (2.2 in)
197941.9 mm (1.6 in)
198030.0 mm (1.2 in)
198184.8 mm (3.3 in)
198278.0 mm (3.1 in)
198340.9 mm (1.6 in)
198421.8 mm (0.9 in)
198722.9 mm (0.9 in)
198837.8 mm (1.5 in)
198943.2 mm (1.7 in)
1990134.9 mm (5.3 in)
199145.0 mm (1.8 in)
199242.2 mm (1.7 in)
199342.9 mm (1.7 in)
199435.8 mm (1.4 in)
199531.8 mm (1.3 in)
199664.3 mm (2.5 in)
199748.8 mm (1.9 in)
199838.9 mm (1.5 in)
199963.8 mm (2.5 in)
200043.9 mm (1.7 in)
200143.9 mm (1.7 in)
200253.8 mm (2.1 in)
200339.9 mm (1.6 in)
200445.5 mm (1.8 in)
200541.9 mm (1.6 in)
200626.9 mm (1.1 in)
200730.0 mm (1.2 in)
200874.9 mm (2.9 in)
200941.9 mm (1.6 in)
201039.9 mm (1.6 in)
201186.9 mm (3.4 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at San Francisco by year The wettest five days of the year at San Francisco, 1961 to 2011. The record is 346.3 mm (13.6 in) in 1990, marked on the chart; the median year is 77.4 mm (3.0 in). 010020030040019701980199020002010Record: 346.3 mm (13.6 in) in 1990
The wettest five days of the year at San Francisco, 1961 to 2011. The record is 346.3 mm (13.6 in) in 1990, marked on the chart; the median year is 77.4 mm (3.0 in).
Wettest five days (Rx5day) at San Francisco by year
YearWettest five days (Rx5day)
196143.4 mm (1.7 in)
196260.3 mm (2.4 in)
196316.7 mm (0.7 in)
196416.7 mm (0.7 in)
196511.6 mm (0.5 in)
196692.7 mm (3.6 in)
196757.2 mm (2.3 in)
1968141.0 mm (5.6 in)
1969123.4 mm (4.9 in)
197078.7 mm (3.1 in)
197187.2 mm (3.4 in)
197250.2 mm (2.0 in)
197391.5 mm (3.6 in)
197484.5 mm (3.3 in)
197557.7 mm (2.3 in)
197658.4 mm (2.3 in)
1977126.5 mm (5.0 in)
197882.1 mm (3.2 in)
197993.5 mm (3.7 in)
198030.0 mm (1.2 in)
1981192.3 mm (7.6 in)
1982143.8 mm (5.7 in)
198374.5 mm (2.9 in)
198473.1 mm (2.9 in)
198775.2 mm (3.0 in)
198894.1 mm (3.7 in)
198948.3 mm (1.9 in)
1990346.3 mm (13.6 in)
1991113.5 mm (4.5 in)
199265.1 mm (2.6 in)
1993109.5 mm (4.3 in)
199459.2 mm (2.3 in)
199548.8 mm (1.9 in)
199694.8 mm (3.7 in)
1997103.6 mm (4.1 in)
199887.7 mm (3.5 in)
1999117.9 mm (4.6 in)
200064.8 mm (2.6 in)
200176.5 mm (3.0 in)
200291.6 mm (3.6 in)
200363.5 mm (2.5 in)
200472.2 mm (2.8 in)
200561.2 mm (2.4 in)
200648.6 mm (1.9 in)
200748.5 mm (1.9 in)
2008134.6 mm (5.3 in)
200977.4 mm (3.0 in)
201094.0 mm (3.7 in)
201186.9 mm (3.4 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at San Francisco by year The longest dry spell of the year at San Francisco, 1961 to 2011. The record is 195 days in 1998, marked on the chart; the median year is 84 days. 05010015020019701980199020002010Record: 195 days in 1998
The longest dry spell of the year at San Francisco, 1961 to 2011. The record is 195 days in 1998, marked on the chart; the median year is 84 days.
Longest dry spell (CDD) at San Francisco by year
YearLongest dry spell (CDD)
196186 days
1962111 days
1963125 days
1964130 days
1965109 days
196668 days
196750 days
196882 days
196966 days
197094 days
197167 days
197279 days
197394 days
197437 days
197582 days
197668 days
197762 days
197849 days
197943 days
198055 days
198168 days
1982121 days
198373 days
198498 days
198750 days
1988119 days
198990 days
199064 days
199190 days
199252 days
199377 days
199484 days
1995165 days
199688 days
199751 days
1998195 days
199984 days
200088 days
2001106 days
200268 days
200388 days
200488 days
200578 days
2006104 days
200783 days
2008134 days
2009150 days
201097 days
2011173 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.

Rainfall Return Levels

43 years, 1961 to 2010

A day with at least 39.4 mm (1.6 in) of rain is expected about once in 2 years. A day with at least 114.5 mm (4.5 in) of rain is expected about once in 100 years.

Rainfall return levels at San Francisco: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years39.4 mm (1.6 in)
5 years58.7 mm (2.3 in)
10 years71.7 mm (2.8 in)
25 years88.7 mm (3.5 in)
50 years101.5 mm (4.0 in)Longer than the 43 years of record
100 years114.5 mm (4.5 in)Longer than the 43 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, 43 years of values from 1961 to 2010.

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: 134.9 mm (5.3 in) in 1990; 83.8 mm (3.3 in) in 1966; 78.0 mm (3.1 in) in 1977.

Download the Data

  • Data for San Francisco standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for San Francisco 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 (2025-12-31).