Daily records
Page built 2026-10-18
Data as of 2025-12-31
Search
Built 2026-10-18 (18 October 2026)

San Marcos Weather Records (MXN00012071)

Record envelope, standing records and threshold days for San Marcos (MXN00012071), Mexico, with 52 years of record.

Key Facts for San Marcos

  • San Marcos (MXN00012071) is a weather station in Mexico at 16.78 latitude and -99.42 longitude, 80 m (262 ft) above sea level.
  • The station reports from 1961 to 2012, 52 years of record.
  • 1,464 records set at San Marcos still stand.
  • Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
  • San Marcos set a daily record low minimum temperature of 15.0 C (59.0 F) on 30 August 2012.

About the Station

  • Location: Mexico, 16.78 latitude, -99.42 longitude.
  • Elevation: 80 m (262 ft).
  • Period of record: 1961 to 2012, 52 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 Marcos, with 2026 drawn through them The band shows the record high and record low for each calendar day at San Marcos. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. 01020304050 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at San Marcos. 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 Marcos, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan40.0 C (104.0 F)7.8 C (46.0 F)n/an/a
Feb40.0 C (104.0 F)8.9 C (48.0 F)n/an/a
Mar42.2 C (108.0 F)8.9 C (48.0 F)n/an/a
Apr45.0 C (113.0 F)8.9 C (48.0 F)n/an/a
May45.0 C (113.0 F)10.0 C (50.0 F)n/an/a
Jun42.8 C (109.0 F)10.0 C (50.0 F)n/an/a
Jul43.9 C (111.0 F)11.7 C (53.1 F)n/an/a
Aug41.7 C (107.1 F)13.9 C (57.0 F)n/an/a
Sep42.8 C (109.0 F)13.9 C (57.0 F)n/an/a
Oct41.7 C (107.1 F)10.0 C (50.0 F)n/an/a
Nov40.0 C (104.0 F)6.7 C (44.1 F)n/an/a
Dec40.0 C (104.0 F)5.0 C (41.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at San Marcos by the year they were set 1,464 records at San Marcos still stand. 2006 holds the most, with 126. 0501001501961: 91962: 141963: 161964: 61965: 101966: 71967: 111968: 81969: 21970: 131972: 51973: 61974: 181975: 601976: 461977: 201978: 381979: 1101980: 731981: 131982: 231983: 331984: 271985: 211986: 181987: 111988: 71989: 151990: 261991: 171992: 111993: 51994: 21995: 31996: 21997: 21998: 42000: 332001: 802002: 282003: 342004: 452005: 532006: 1262007: 462008: 952009: 882010: 742011: 212012: 291961196619721977198219871992199720032008
1,464 records at San Marcos still stand. 2006 holds the most, with 126.
Standing records at San Marcos by the year they were set
Year setStanding records
19619
196214
196316
19646
196510
19667
196711
19688
19692
197013
19725
19736
197418
197560
197646
197720
197838
1979110
198073
198113
198223
198333
198427
198521
198618
198711
19887
198915
199026
199117
199211
19935
19942
19953
19962
19972
19984
200033
200180
200228
200334
200445
200553
2006126
200746
200895
200988
201074
201121
201229

All-Time Record Progression

4 new records
When San Marcos set new all-time records 4 all-time records were set at San Marcos between 1 September 2001 and 4 December 2008. Each dot is a new record. Record low maximum temperatureRecord low minimum temperature1 September 2001: Record low maximum temperature 22.8 C (73.0 F)2 September 2001: Record low maximum temperature 22.2 C (72.0 F)15 November 2008: Record low minimum temperature 6.7 C (44.1 F)4 December 2008: Record low minimum temperature 5.0 C (41.0 F)2005
4 all-time records were set at San Marcos between 1 September 2001 and 4 December 2008. Each dot is a new record.
When San Marcos set new all-time records
DateKindDetail
2001-09-01Record low maximum temperatureRecord low maximum temperature 22.8 C (73.0 F)
2001-09-02Record low maximum temperatureRecord low maximum temperature 22.2 C (72.0 F)
2008-11-15Record low minimum temperatureRecord low minimum temperature 6.7 C (44.1 F)
2008-12-04Record low minimum temperatureRecord low minimum temperature 5.0 C (41.0 F)

Wettest Day of Each Month

Jun: 399.8 mm (15.7 in)
Record daily precipitation for each month at San Marcos The wettest day on record for each calendar month at San Marcos. The most was 399.8 mm (15.7 in) on 22 June 1973. 0100200300400 Jan: 54.9 mm (2.2 in), 16 January 2004 Jan Feb: 64.8 mm (2.6 in), 3 February 2010 Feb Mar: 23.9 mm (0.9 in), 12 March 1983 Mar Apr: 39.9 mm (1.6 in), 3 April 1966 Apr May: 129.8 mm (5.1 in), 30 May 1978 May Jun: 399.8 mm (15.7 in), 22 June 1973 Jun Jul: 249.9 mm (9.8 in), 5 July 1996 Jul Aug: 150.4 mm (5.9 in), 30 August 1988 Aug Sep: 295.9 mm (11.6 in), 26 September 1967 Sep Oct: 220.0 mm (8.7 in), 8 October 1997 Oct Nov: 216.9 mm (8.5 in), 11 November 1961 Nov Dec: 77.0 mm (3.0 in), 23 December 1991 Dec
The wettest day on record for each calendar month at San Marcos. The most was 399.8 mm (15.7 in) on 22 June 1973.
Record daily precipitation for each month at San Marcos
MonthRecord daily precipitation (mm)Date
Jan54.9 mm (2.2 in)16 January 2004
Feb64.8 mm (2.6 in)3 February 2010
Mar23.9 mm (0.9 in)12 March 1983
Apr39.9 mm (1.6 in)3 April 1966
May129.8 mm (5.1 in)30 May 1978
Jun399.8 mm (15.7 in)22 June 1973
Jul249.9 mm (9.8 in)5 July 1996
Aug150.4 mm (5.9 in)30 August 1988
Sep295.9 mm (11.6 in)26 September 1967
Oct220.0 mm (8.7 in)8 October 1997
Nov216.9 mm (8.5 in)11 November 1961
Dec77.0 mm (3.0 in)23 December 1991

Period of Record Coverage

1961 to 2012
Days with data per year at San Marcos 51 years of record at San Marcos, 1961 to 2012. 10 years have data for under 90 percent of days and are left out of rankings: 1961, 1967, 1970, 1971, 1998, 2000, 2002, 2005 and others. 1961: 170 of 365 days1962: 365 of 365 days1963: 365 of 365 days1964: 366 of 366 days1965: 357 of 365 days1966: 364 of 365 days1967: 268 of 365 days1968: 366 of 366 days1969: 356 of 365 days1970: 314 of 365 days1971: 324 of 365 days1972: 366 of 366 days1973: 365 of 365 days1974: 359 of 365 days1975: 352 of 365 days1976: 359 of 366 days1977: 365 of 365 days1978: 363 of 365 days1979: 365 of 365 days1980: 366 of 366 days1981: 365 of 365 days1982: 365 of 365 days1983: 361 of 365 days1984: 366 of 366 days1985: 365 of 365 days1986: 365 of 365 days1987: 350 of 365 days1988: 335 of 366 days1989: 334 of 365 days1990: 365 of 365 days1991: 365 of 365 days1992: 366 of 366 days1993: 365 of 365 days1994: 345 of 365 days1995: 365 of 365 days1996: 366 of 366 days1997: 365 of 365 days1998: 243 of 365 days2000: 245 of 366 days2001: 363 of 365 days2002: 313 of 365 days2003: 365 of 365 days2004: 365 of 366 days2005: 273 of 365 days2006: 364 of 365 days2007: 181 of 365 days2008: 350 of 366 days2009: 345 of 365 days2010: 365 of 365 days2011: 334 of 365 days2012: 244 of 366 days19701980199020002010
51 years of record at San Marcos, 1961 to 2012. 10 years have data for under 90 percent of days and are left out of rankings: 1961, 1967, 1970, 1971, 1998, 2000, 2002, 2005 and others.
Days with data per year at San Marcos
YearDays with dataShare of yearComplete
196117047%No
1962365100%Yes
1963365100%Yes
1964366100%Yes
196535798%Yes
1966364100%Yes
196726873%No
1968366100%Yes
196935698%Yes
197031486%No
197132489%No
1972366100%Yes
1973365100%Yes
197435998%Yes
197535296%Yes
197635998%Yes
1977365100%Yes
197836399%Yes
1979365100%Yes
1980366100%Yes
1981365100%Yes
1982365100%Yes
198336199%Yes
1984366100%Yes
1985365100%Yes
1986365100%Yes
198735096%Yes
198833592%Yes
198933492%Yes
1990365100%Yes
1991365100%Yes
1992366100%Yes
1993365100%Yes
199434595%Yes
1995365100%Yes
1996366100%Yes
1997365100%Yes
199824367%No
200024567%No
200136399%Yes
200231386%No
2003365100%Yes
2004365100%Yes
200527375%No
2006364100%Yes
200718150%No
200835096%Yes
200934595%Yes
2010365100%Yes
201133492%Yes
201224467%No

Latest Records

20
Latest records at San Marcos
DateStationRecordValueBeat old record byOld record stoodSignificance
30 August 2012San Marcos, MXdaily low min15.0 C (59.0 F)0.6 C (1.1 F)8 years9 of 100 (Routine)
29 August 2012San Marcos, MXmonthly low min (Tie)13.9 C (57.0 F)tie10 years4 of 100 (Routine)
25 August 2012San Marcos, MXmonthly low min (Tie)13.9 C (57.0 F)tie9 years4 of 100 (Routine)
24 August 2012San Marcos, MXmonthly low min (Tie)13.9 C (57.0 F)tie9 years4 of 100 (Routine)
22 August 2012San Marcos, MXmonthly low min (Tie)13.9 C (57.0 F)tie9 years4 of 100 (Routine)
21 August 2012San Marcos, MXmonthly low min (Tie)13.9 C (57.0 F)tie9 years4 of 100 (Routine)
20 August 2012San Marcos, MXdaily low min (Tie)15.0 C (59.0 F)tie8 years1 of 100 (Routine)
19 August 2012San Marcos, MXmonthly low min (Tie)13.9 C (57.0 F)tie9 years4 of 100 (Routine)
18 August 2012San Marcos, MXmonthly low min (Tie)13.9 C (57.0 F)tie9 years4 of 100 (Routine)
17 August 2012San Marcos, MXmonthly low min (Tie)13.9 C (57.0 F)tie9 years4 of 100 (Routine)
9 August 2012San Marcos, MXmonthly low min (Tie)13.9 C (57.0 F)tie9 years4 of 100 (Routine)
25 July 2012San Marcos, MXdaily low min (Tie)15.0 C (59.0 F)tie1 year1 of 100 (Routine)
24 July 2012San Marcos, MXdaily low min (Tie)13.9 C (57.0 F)tie8 years1 of 100 (Routine)
20 July 2012San Marcos, MXdaily low min13.9 C (57.0 F)1.1 C (2.0 F)6 years10 of 100 (Routine)
19 July 2012San Marcos, MXdaily high max (Tie)37.8 C (100.0 F)tie6 years1 of 100 (Routine)
18 July 2012San Marcos, MXdaily low min (Tie)12.8 C (55.0 F)tie7 years1 of 100 (Routine)
16 July 2012San Marcos, MXdaily low min (Tie)12.8 C (55.0 F)tie8 years1 of 100 (Routine)
13 July 2012San Marcos, MXdaily low min12.8 C (55.0 F)1.1 C (2.0 F)8 years11 of 100 (Routine)
12 July 2012San Marcos, MXdaily low min (Tie)12.8 C (55.0 F)tie7 years1 of 100 (Routine)
11 July 2012San Marcos, MXdaily low min (Tie)12.8 C (55.0 F)tie2 years1 of 100 (Routine)

Climate Trend

31 complete years, 1962 to 2004
Annual mean temperature at San Marcos as warming stripes, 1962 to 2004 One stripe for each of 31 complete years at San Marcos, 1962 to 2004. Blue stripes are years cooler than the station's own mean of 26.8 C (80.2 F); red stripes are warmer. The coolest year was 2004, at 23.7 C (74.7 F), and the warmest was 1975, at 28.8 C (83.8 F). The strongest colour marks a difference of 3.1 C (5.6 F). 1962: 26.5 C, -0.3 C from the station mean1963: 27.1 C, +0.3 C from the station mean1964: 26.8 C, 0.0 C from the station mean1965: 26.8 C, 0.0 C from the station mean1968: 26.8 C, 0.0 C from the station mean1969: 26.8 C, 0.0 C from the station mean1972: 26.7 C, 0.0 C from the station mean1973: 26.4 C, -0.4 C from the station mean1974: 26.5 C, -0.3 C from the station mean1975: 28.8 C, +2.0 C from the station mean1976: 27.3 C, +0.5 C from the station mean1977: 26.9 C, +0.2 C from the station mean1978: 28.1 C, +1.3 C from the station mean1979: 28.4 C, +1.6 C from the station mean1980: 27.9 C, +1.1 C from the station mean1981: 27.1 C, +0.3 C from the station mean1982: 27.0 C, +0.2 C from the station mean1983: 26.4 C, -0.4 C from the station mean1984: 26.1 C, -0.7 C from the station mean1985: 26.2 C, -0.6 C from the station mean1986: 26.5 C, -0.3 C from the station mean1990: 26.7 C, 0.0 C from the station mean1991: 26.6 C, -0.2 C from the station mean1992: 26.2 C, -0.6 C from the station mean1993: 26.4 C, -0.4 C from the station mean1995: 26.9 C, +0.1 C from the station mean1996: 27.0 C, +0.2 C from the station mean1997: 27.1 C, +0.3 C from the station mean2001: 26.5 C, -0.3 C from the station mean2003: 26.3 C, -0.5 C from the station mean2004: 23.7 C, -3.1 C from the station mean196219651970197519801985199019952000
One stripe for each of 31 complete years at San Marcos, 1962 to 2004. Blue stripes are years cooler than the station's own mean of 26.8 C (80.2 F); red stripes are warmer. The coolest year was 2004, at 23.7 C (74.7 F), and the warmest was 1975, at 28.8 C (83.8 F). The strongest colour marks a difference of 3.1 C (5.6 F).
Annual mean temperature at San Marcos as warming stripes, 1962 to 2004
YearAnnual mean temperatureDifference from the station mean
196226.5 C-0.27 C
196327.1 C+0.29 C
196426.8 C-0.03 C
196526.8 C+0.04 C
196826.8 C-0.03 C
196926.8 C-0.02 C
197226.7 C-0.04 C
197326.4 C-0.39 C
197426.5 C-0.25 C
197528.8 C+1.98 C
197627.3 C+0.53 C
197726.9 C+0.16 C
197828.1 C+1.34 C
197928.4 C+1.57 C
198027.9 C+1.09 C
198127.1 C+0.29 C
198227.0 C+0.25 C
198326.4 C-0.43 C
198426.1 C-0.68 C
198526.2 C-0.57 C
198626.5 C-0.25 C
199026.7 C-0.04 C
199126.6 C-0.17 C
199226.2 C-0.62 C
199326.4 C-0.39 C
199526.9 C+0.08 C
199627.0 C+0.23 C
199727.1 C+0.31 C
200126.5 C-0.28 C
200326.3 C-0.48 C
200423.7 C-3.07 C

The annual mean temperature here has fallen by 0.26 C (0.01 to 0.51) per decade over 1962 to 2004. In Fahrenheit: 0.47 F (0.03 to 0.92) 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 San Marcos
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature-0.26 C (-0.51 to -0.01) per decade-0.47 F (-0.92 to -0.03) per decade1962 to 200431Fall
Mean daily maximum-0.5 C (-0.9 to -0.1) per decade-1.0 F (-1.7 to -0.3) per decade1962 to 200431Fall
Mean daily minimum0.01 C (-0.37 to 0.40) per decade0.02 F (-0.67 to 0.72) per decade1962 to 200431Not 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

1961 to 2012
Yearly extremes at San Marcos: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)45.0 C (113.0 F)197936.7 C (98.1 F)51
Coldest night (TNn)5.0 C (41.0 F)200811.7 C (53.1 F)51
Wettest day (Rx1day)399.8 mm (15.7 in)1973113.8 mm (4.5 in)51
Wettest five days (Rx5day)1,013.8 mm (39.9 in)1974216.0 mm (8.5 in)51
Longest dry spell (CDD)170 days1969134 days51

Hottest day (TXx)

Hottest day (TXx) at San Marcos by year The hottest day of the year at San Marcos, 1961 to 2012. The record is 45.0 C (113.0 F) in 1979, marked on the chart; the median year is 36.7 C (98.1 F). 3035404519701980199020002010Record: 45.0 C (113.0 F) in 1979
The hottest day of the year at San Marcos, 1961 to 2012. The record is 45.0 C (113.0 F) in 1979, marked on the chart; the median year is 36.7 C (98.1 F).
Hottest day (TXx) at San Marcos by year
YearHottest day (TXx)
196136.7 C (98.1 F)
196238.9 C (102.0 F)
196340.0 C (104.0 F)
196438.9 C (102.0 F)
196537.8 C (100.0 F)
196638.3 C (100.9 F)
196736.7 C (98.1 F)
196836.7 C (98.1 F)
196936.7 C (98.1 F)
197036.7 C (98.1 F)
197136.7 C (98.1 F)
197236.7 C (98.1 F)
197335.6 C (96.1 F)
197438.9 C (102.0 F)
197542.2 C (108.0 F)
197640.0 C (104.0 F)
197738.3 C (100.9 F)
197839.4 C (102.9 F)
197945.0 C (113.0 F)
198041.7 C (107.1 F)
198138.9 C (102.0 F)
198238.9 C (102.0 F)
198335.6 C (96.1 F)
198436.7 C (98.1 F)
198537.2 C (99.0 F)
198636.1 C (97.0 F)
198737.8 C (100.0 F)
198836.1 C (97.0 F)
198935.0 C (95.0 F)
199035.0 C (95.0 F)
199135.0 C (95.0 F)
199235.0 C (95.0 F)
199336.7 C (98.1 F)
199437.8 C (100.0 F)
199535.6 C (96.1 F)
199636.7 C (98.1 F)
199735.0 C (95.0 F)
199836.7 C (98.1 F)
200034.4 C (93.9 F)
200136.7 C (98.1 F)
200235.6 C (96.1 F)
200336.7 C (98.1 F)
200436.7 C (98.1 F)
200538.9 C (102.0 F)
200643.9 C (111.0 F)
200742.8 C (109.0 F)
200843.9 C (111.0 F)
200941.7 C (107.1 F)
201035.6 C (96.1 F)
201140.0 C (104.0 F)
201238.9 C (102.0 F)

Coldest night (TNn)

Coldest night (TNn) at San Marcos by year The coldest night of the year at San Marcos, 1961 to 2012. The record is 5.0 C (41.0 F) in 2008, marked on the chart; the median year is 11.7 C (53.1 F). 510152019701980199020002010Record: 5.0 C (41.0 F) in 2008
The coldest night of the year at San Marcos, 1961 to 2012. The record is 5.0 C (41.0 F) in 2008, marked on the chart; the median year is 11.7 C (53.1 F).
Coldest night (TNn) at San Marcos by year
YearColdest night (TNn)
196111.7 C (53.1 F)
196210.6 C (51.1 F)
196310.0 C (50.0 F)
196411.7 C (53.1 F)
196510.6 C (51.1 F)
196611.7 C (53.1 F)
196710.0 C (50.0 F)
196810.0 C (50.0 F)
196910.6 C (51.1 F)
19708.9 C (48.0 F)
197111.7 C (53.1 F)
197212.8 C (55.0 F)
197313.9 C (57.0 F)
197412.8 C (55.0 F)
197511.1 C (52.0 F)
197613.3 C (55.9 F)
197713.3 C (55.9 F)
197815.0 C (59.0 F)
197910.6 C (51.1 F)
19807.8 C (46.0 F)
198110.6 C (51.1 F)
198213.9 C (57.0 F)
198311.7 C (53.1 F)
198410.0 C (50.0 F)
198511.7 C (53.1 F)
198611.7 C (53.1 F)
198715.0 C (59.0 F)
198811.7 C (53.1 F)
198915.0 C (59.0 F)
199013.9 C (57.0 F)
199115.6 C (60.1 F)
199215.0 C (59.0 F)
199315.0 C (59.0 F)
199415.0 C (59.0 F)
199515.6 C (60.1 F)
199616.7 C (62.1 F)
199715.0 C (59.0 F)
199810.6 C (51.1 F)
200010.0 C (50.0 F)
200114.4 C (57.9 F)
200210.0 C (50.0 F)
200310.0 C (50.0 F)
200410.0 C (50.0 F)
200510.0 C (50.0 F)
20068.9 C (48.0 F)
20078.9 C (48.0 F)
20085.0 C (41.0 F)
200910.0 C (50.0 F)
20108.9 C (48.0 F)
201110.0 C (50.0 F)
201210.0 C (50.0 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at San Marcos by year The wettest day of the year at San Marcos, 1961 to 2012. The record is 399.8 mm (15.7 in) in 1973, marked on the chart; the median year is 113.8 mm (4.5 in). 010020030040019701980199020002010Record: 399.8 mm (15.7 in) in 1973
The wettest day of the year at San Marcos, 1961 to 2012. The record is 399.8 mm (15.7 in) in 1973, marked on the chart; the median year is 113.8 mm (4.5 in).
Wettest day (Rx1day) at San Marcos by year
YearWettest day (Rx1day)
1961216.9 mm (8.5 in)
196282.3 mm (3.2 in)
1963113.8 mm (4.5 in)
1964106.4 mm (4.2 in)
1965114.8 mm (4.5 in)
1966122.4 mm (4.8 in)
1967295.9 mm (11.6 in)
196885.9 mm (3.4 in)
1969111.8 mm (4.4 in)
197064.8 mm (2.6 in)
197164.8 mm (2.6 in)
1972116.8 mm (4.6 in)
1973399.8 mm (15.7 in)
1974349.8 mm (13.8 in)
197579.5 mm (3.1 in)
1976197.9 mm (7.8 in)
1977118.9 mm (4.7 in)
1978129.8 mm (5.1 in)
1979124.0 mm (4.9 in)
198063.8 mm (2.5 in)
1981147.8 mm (5.8 in)
198268.8 mm (2.7 in)
1983123.4 mm (4.9 in)
1984174.8 mm (6.9 in)
198573.9 mm (2.9 in)
198687.9 mm (3.5 in)
1987126.0 mm (5.0 in)
1988155.4 mm (6.1 in)
1989229.9 mm (9.1 in)
199091.9 mm (3.6 in)
1991110.0 mm (4.3 in)
1992112.8 mm (4.4 in)
1993149.9 mm (5.9 in)
199464.8 mm (2.6 in)
1995119.9 mm (4.7 in)
1996249.9 mm (9.8 in)
1997220.0 mm (8.7 in)
1998199.9 mm (7.9 in)
200069.9 mm (2.8 in)
200179.8 mm (3.1 in)
200284.8 mm (3.3 in)
200385.9 mm (3.4 in)
200497.8 mm (3.9 in)
200597.8 mm (3.9 in)
200691.9 mm (3.6 in)
2007125.0 mm (4.9 in)
2008184.9 mm (7.3 in)
200975.9 mm (3.0 in)
2010126.5 mm (5.0 in)
201185.3 mm (3.4 in)
201266.8 mm (2.6 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at San Marcos by year The wettest five days of the year at San Marcos, 1961 to 2012. The record is 1,013.8 mm (39.9 in) in 1974, marked on the chart; the median year is 216.0 mm (8.5 in). 02505007501,0001,25019701980199020002010Record: 1,013.8 mm (39.9 in) in 1974
The wettest five days of the year at San Marcos, 1961 to 2012. The record is 1,013.8 mm (39.9 in) in 1974, marked on the chart; the median year is 216.0 mm (8.5 in).
Wettest five days (Rx5day) at San Marcos by year
YearWettest five days (Rx5day)
1961403.6 mm (15.9 in)
1962170.9 mm (6.7 in)
1963265.6 mm (10.5 in)
1964165.4 mm (6.5 in)
1965183.9 mm (7.2 in)
1966216.0 mm (8.5 in)
1967608.3 mm (23.9 in)
1968167.4 mm (6.6 in)
1969368.6 mm (14.5 in)
197083.5 mm (3.3 in)
1971173.3 mm (6.8 in)
1972402.4 mm (15.8 in)
1973522.2 mm (20.6 in)
19741,013.8 mm (39.9 in)
1975252.3 mm (9.9 in)
1976286.9 mm (11.3 in)
1977158.0 mm (6.2 in)
1978179.1 mm (7.1 in)
1979221.5 mm (8.7 in)
1980103.2 mm (4.1 in)
1981343.4 mm (13.5 in)
1982105.4 mm (4.1 in)
1983149.3 mm (5.9 in)
1984322.1 mm (12.7 in)
1985164.7 mm (6.5 in)
1986205.8 mm (8.1 in)
1987153.1 mm (6.0 in)
1988405.6 mm (16.0 in)
1989365.5 mm (14.4 in)
1990152.4 mm (6.0 in)
1991209.6 mm (8.3 in)
1992233.5 mm (9.2 in)
1993280.5 mm (11.0 in)
1994161.1 mm (6.3 in)
1995239.6 mm (9.4 in)
1996362.5 mm (14.3 in)
1997314.5 mm (12.4 in)
1998327.6 mm (12.9 in)
2000152.1 mm (6.0 in)
2001185.5 mm (7.3 in)
2002239.5 mm (9.4 in)
2003168.6 mm (6.6 in)
2004318.4 mm (12.5 in)
2005221.0 mm (8.7 in)
2006167.2 mm (6.6 in)
2007144.8 mm (5.7 in)
2008184.9 mm (7.3 in)
2009179.3 mm (7.1 in)
2010235.9 mm (9.3 in)
2011264.3 mm (10.4 in)
2012192.4 mm (7.6 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at San Marcos by year The longest dry spell of the year at San Marcos, 1961 to 2012. The record is 170 days in 1969, marked on the chart; the median year is 134 days. 05010015020019701980199020002010Record: 170 days in 1969
The longest dry spell of the year at San Marcos, 1961 to 2012. The record is 170 days in 1969, marked on the chart; the median year is 134 days.
Longest dry spell (CDD) at San Marcos by year
YearLongest dry spell (CDD)
196149 days
1962105 days
1963124 days
1964139 days
196583 days
196671 days
1967149 days
1968132 days
1969170 days
1970158 days
1971141 days
1972141 days
197382 days
1974146 days
1975107 days
1976152 days
1977121 days
1978110 days
1979114 days
1980122 days
1981134 days
1982138 days
198371 days
1984126 days
1985154 days
1986140 days
1987133 days
1988159 days
1989143 days
199085 days
1991170 days
1992121 days
1993168 days
1994152 days
199584 days
1996148 days
1997122 days
1998161 days
200078 days
2001128 days
200275 days
2003151 days
2004118 days
2005170 days
2006137 days
2007146 days
2008139 days
2009161 days
2010126 days
2011104 days
2012150 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

47 years, 1962 to 2012

A day with at least 107.6 mm (4.2 in) of rain is expected about once in 2 years. A day with at least 463.6 mm (18.3 in) of rain is expected about once in 100 years.

Rainfall return levels at San Marcos: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years107.6 mm (4.2 in)
5 years160.0 mm (6.3 in)
10 years207.5 mm (8.2 in)
25 years287.4 mm (11.3 in)
50 years365.5 mm (14.4 in)Longer than the 47 years of record
100 years463.6 mm (18.3 in)Longer than the 47 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, 47 years of values from 1962 to 2012.

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: 399.8 mm (15.7 in) in 1973; 349.8 mm (13.8 in) in 1974; 295.9 mm (11.6 in) in 1967.

Download the Data

  • Data for San Marcos standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for San Marcos 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 2026-10-16 (16 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2025-12-31).