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Union de San Antonio Weather Records (MXN00014157)

Record envelope, standing records and threshold days for Union de San Antonio (MXN00014157), Mexico, with 51 years of record.

Key Facts for Union de San Antonio

  • Union de San Antonio (MXN00014157) is a weather station in Mexico at 21.12 latitude and -102.00 longitude, 1,917 m (6,289 ft) above sea level.
  • The station reports from 1961 to 2011, 51 years of record.
  • 1,464 records set at Union de San Antonio still stand.
  • Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
  • Union de San Antonio tied a daily record low minimum temperature of 1.7 C (35.1 F) on 1 December 2011.

About the Station

  • Location: Mexico, 21.12 latitude, -102.00 longitude.
  • Elevation: 1,917 m (6,289 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 Union de San Antonio, with 2026 drawn through them The band shows the record high and record low for each calendar day at Union de San Antonio. The lines show the 2026 daily maximum and minimum. 0 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 Union de San Antonio. 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 Union de San Antonio, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan35.0 C (95.0 F)-4.4 C (24.1 F)n/an/a
Feb38.9 C (102.0 F)-3.3 C (26.1 F)n/an/a
Mar40.6 C (105.1 F)-3.3 C (26.1 F)n/an/a
Apr44.4 C (111.9 F)0.6 C (33.1 F)n/an/a
May41.7 C (107.1 F)3.3 C (37.9 F)n/an/a
Jun40.6 C (105.1 F)3.9 C (39.0 F)n/an/a
Jul38.9 C (102.0 F)3.9 C (39.0 F)n/an/a
Aug38.3 C (100.9 F)3.9 C (39.0 F)n/an/a
Sep35.6 C (96.1 F)3.9 C (39.0 F)n/an/a
Oct40.0 C (104.0 F)0.6 C (33.1 F)n/an/a
Nov37.8 C (100.0 F)-2.8 C (27.0 F)n/an/a
Dec36.1 C (97.0 F)-5.0 C (23.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Union de San Antonio by the year they were set 1,464 records at Union de San Antonio still stand. 1999 holds the most, with 145. 0501001501961: 231962: 161963: 171964: 211965: 231966: 281967: 351968: 241969: 131970: 361971: 241972: 301973: 231974: 121975: 71976: 271977: 61978: 201979: 161980: 151981: 131982: 141983: 171984: 131985: 331986: 471987: 711988: 521989: 111990: 231992: 81993: 621994: 381995: 181996: 231998: 221999: 1452000: 1072001: 372003: 72004: 742005: 332006: 832007: 542008: 22009: 42010: 272011: 101961196619711976198119861992199820042009
1,464 records at Union de San Antonio still stand. 1999 holds the most, with 145.
Standing records at Union de San Antonio by the year they were set
Year setStanding records
196123
196216
196317
196421
196523
196628
196735
196824
196913
197036
197124
197230
197323
197412
19757
197627
19776
197820
197916
198015
198113
198214
198317
198413
198533
198647
198771
198852
198911
199023
19928
199362
199438
199518
199623
199822
1999145
2000107
200137
20037
200474
200533
200683
200754
20082
20094
201027
201110

All-Time Record Progression

2 new records
When Union de San Antonio set new all-time records 2 all-time records were set at Union de San Antonio between 5 April 1999 and 9 April 1999. Each dot is a new record. Record high maximum temperature5 April 1999: Record high maximum temperature 43.3 C (109.9 F)9 April 1999: Record high maximum temperature 44.4 C (111.9 F)2000
2 all-time records were set at Union de San Antonio between 5 April 1999 and 9 April 1999. Each dot is a new record.
When Union de San Antonio set new all-time records
DateKindDetail
1999-04-05Record high maximum temperatureRecord high maximum temperature 43.3 C (109.9 F)
1999-04-09Record high maximum temperatureRecord high maximum temperature 44.4 C (111.9 F)

Wettest Day of Each Month

Jul: 104.9 mm (4.1 in)
Record daily precipitation for each month at Union de San Antonio The wettest day on record for each calendar month at Union de San Antonio. The most was 104.9 mm (4.1 in) on 10 July 1976. 050100150 Jan: 28.4 mm (1.1 in), 25 January 1992 Jan Feb: 71.6 mm (2.8 in), 3 February 2010 Feb Mar: 31.5 mm (1.2 in), 4 March 1968 Mar Apr: 39.9 mm (1.6 in), 14 April 1981 Apr May: 42.7 mm (1.7 in), 22 May 2004 May Jun: 64.8 mm (2.6 in), 27 June 1963 Jun Jul: 104.9 mm (4.1 in), 10 July 1976 Jul Aug: 98.8 mm (3.9 in), 13 August 2002 Aug Sep: 93.0 mm (3.7 in), 4 September 2003 Sep Oct: 56.9 mm (2.2 in), 10 October 1994 Oct Nov: 69.9 mm (2.8 in), 15 November 1964 Nov Dec: 27.4 mm (1.1 in), 3 December 1979 Dec
The wettest day on record for each calendar month at Union de San Antonio. The most was 104.9 mm (4.1 in) on 10 July 1976.
Record daily precipitation for each month at Union de San Antonio
MonthRecord daily precipitation (mm)Date
Jan28.4 mm (1.1 in)25 January 1992
Feb71.6 mm (2.8 in)3 February 2010
Mar31.5 mm (1.2 in)4 March 1968
Apr39.9 mm (1.6 in)14 April 1981
May42.7 mm (1.7 in)22 May 2004
Jun64.8 mm (2.6 in)27 June 1963
Jul104.9 mm (4.1 in)10 July 1976
Aug98.8 mm (3.9 in)13 August 2002
Sep93.0 mm (3.7 in)4 September 2003
Oct56.9 mm (2.2 in)10 October 1994
Nov69.9 mm (2.8 in)15 November 1964
Dec27.4 mm (1.1 in)3 December 1979

Period of Record Coverage

1961 to 2011
Days with data per year at Union de San Antonio 49 years of record at Union de San Antonio, 1961 to 2011. 19 years have data for under 90 percent of days and are left out of rankings: 1962, 1974, 1987, 1988, 1989, 1990, 1991, 1992 and others. 1961: 361 of 365 days1962: 312 of 365 days1963: 360 of 365 days1964: 334 of 366 days1965: 363 of 365 days1966: 363 of 365 days1967: 362 of 365 days1968: 363 of 366 days1969: 363 of 365 days1970: 362 of 365 days1971: 360 of 365 days1972: 361 of 366 days1973: 361 of 365 days1974: 304 of 365 days1975: 335 of 365 days1976: 365 of 366 days1977: 365 of 365 days1978: 364 of 365 days1979: 365 of 365 days1980: 366 of 366 days1981: 364 of 365 days1982: 365 of 365 days1983: 363 of 365 days1984: 366 of 366 days1985: 351 of 365 days1986: 358 of 365 days1987: 181 of 365 days1988: 210 of 366 days1989: 270 of 365 days1990: 210 of 365 days1991: 59 of 365 days1992: 117 of 366 days1993: 270 of 365 days1994: 193 of 365 days1995: 129 of 365 days1996: 30 of 366 days1998: 31 of 365 days1999: 295 of 365 days2000: 293 of 366 days2001: 176 of 365 days2003: 39 of 365 days2004: 26 of 366 days2005: 362 of 365 days2006: 363 of 365 days2007: 365 of 365 days2008: 366 of 366 days2009: 364 of 365 days2010: 365 of 365 days2011: 304 of 365 days19701980199020002010
49 years of record at Union de San Antonio, 1961 to 2011. 19 years have data for under 90 percent of days and are left out of rankings: 1962, 1974, 1987, 1988, 1989, 1990, 1991, 1992 and others.
Days with data per year at Union de San Antonio
YearDays with dataShare of yearComplete
196136199%Yes
196231285%No
196336099%Yes
196433491%Yes
196536399%Yes
196636399%Yes
196736299%Yes
196836399%Yes
196936399%Yes
197036299%Yes
197136099%Yes
197236199%Yes
197336199%Yes
197430483%No
197533592%Yes
1976365100%Yes
1977365100%Yes
1978364100%Yes
1979365100%Yes
1980366100%Yes
1981364100%Yes
1982365100%Yes
198336399%Yes
1984366100%Yes
198535196%Yes
198635898%Yes
198718150%No
198821057%No
198927074%No
199021058%No
19915916%No
199211732%No
199327074%No
199419353%No
199512935%No
1996308%No
1998318%No
199929581%No
200029380%No
200117648%No
20033911%No
2004267%No
200536299%Yes
200636399%Yes
2007365100%Yes
2008366100%Yes
2009364100%Yes
2010365100%Yes
201130483%No

Latest Records

20
Latest records at Union de San Antonio
DateStationRecordValueBeat old record byOld record stoodSignificance
1 December 2011Union de San Antonio, MXdaily low min (Tie)1.7 C (35.1 F)tie44 years4 of 100 (Routine)
28 November 2011Union de San Antonio, MXdaily low min (Tie)1.7 C (35.1 F)tie42 years4 of 100 (Routine)
13 October 2011Union de San Antonio, MXdaily low max (Tie)20.0 C (68.0 F)tie34 years3 of 100 (Routine)
12 October 2011Union de San Antonio, MXdaily low max (Tie)20.6 C (69.1 F)tie20 years2 of 100 (Routine)
8 October 2011Union de San Antonio, MXdaily high min (Tie)15.6 C (60.1 F)tie4 years1 of 100 (Routine)
6 October 2011Union de San Antonio, MXdaily high min (Tie)15.6 C (60.1 F)tie12 years2 of 100 (Routine)
24 September 2011Union de San Antonio, MXdaily high min (Tie)15.6 C (60.1 F)tie9 years1 of 100 (Routine)
2 September 2011Union de San Antonio, MXdaily rain51.8 mm (2.0 in)12.7 mm (0.5 in)6 years17 of 100 (Routine)
31 August 2011Union de San Antonio, MXdaily high min (Tie)15.6 C (60.1 F)tie40 years4 of 100 (Routine)
29 August 2011Union de San Antonio, MXdaily high min (Tie)15.0 C (59.0 F)tie48 years4 of 100 (Routine)
16 August 2011Union de San Antonio, MXdaily high min (Tie)15.6 C (60.1 F)tie42 years4 of 100 (Routine)
15 August 2011Union de San Antonio, MXdaily high min15.6 C (60.1 F)0.6 C (1.1 F)29 years15 of 100 (Routine)
10 August 2011Union de San Antonio, MXdaily high min (Tie)15.0 C (59.0 F)tie44 years4 of 100 (Routine)
7 August 2011Union de San Antonio, MXdaily high min (Tie)15.6 C (60.1 F)tie40 years4 of 100 (Routine)
4 August 2011Union de San Antonio, MXdaily high min (Tie)15.0 C (59.0 F)tie44 years4 of 100 (Routine)
3 August 2011Union de San Antonio, MXdaily high min15.6 C (60.1 F)0.6 C (1.1 F)26 years15 of 100 (Routine)
17 May 2011Union de San Antonio, MXdaily high min (Tie)15.6 C (60.1 F)tie9 years1 of 100 (Routine)
14 May 2011Union de San Antonio, MXdaily high min (Tie)15.6 C (60.1 F)tie28 years3 of 100 (Routine)
1 May 2011Union de San Antonio, MXdaily high min (Tie)15.6 C (60.1 F)tie24 years3 of 100 (Routine)
27 April 2011Union de San Antonio, MXdaily high min15.6 C (60.1 F)1.7 C (3.1 F)49 years25 of 100 (Routine)

Climate Trend

27 complete years, 1961 to 2010
Annual mean temperature at Union de San Antonio as warming stripes, 1961 to 2010 One stripe for each of 27 complete years at Union de San Antonio, 1961 to 2010. Blue stripes are years cooler than the station's own mean of 17.5 C (63.4 F); red stripes are warmer. The coolest year was 1985, at 16.3 C (61.3 F), and the warmest was 2007, at 19.3 C (66.8 F). The strongest colour marks a difference of 1.9 C (3.4 F). 1961: 17.7 C, +0.2 C from the station mean1963: 18.1 C, +0.6 C from the station mean1966: 16.9 C, -0.5 C from the station mean1967: 16.5 C, -1.0 C from the station mean1968: 17.2 C, -0.3 C from the station mean1969: 17.6 C, +0.1 C from the station mean1970: 17.8 C, +0.3 C from the station mean1971: 17.2 C, -0.3 C from the station mean1972: 17.8 C, +0.4 C from the station mean1973: 17.6 C, +0.1 C from the station mean1976: 17.0 C, -0.4 C from the station mean1977: 17.3 C, -0.1 C from the station mean1978: 17.3 C, -0.2 C from the station mean1979: 17.7 C, +0.3 C from the station mean1980: 17.9 C, +0.4 C from the station mean1981: 17.6 C, +0.1 C from the station mean1982: 18.4 C, +0.9 C from the station mean1983: 17.6 C, +0.1 C from the station mean1984: 17.5 C, +0.1 C from the station mean1985: 16.3 C, -1.2 C from the station mean1986: 16.8 C, -0.7 C from the station mean2005: 16.4 C, -1.0 C from the station mean2006: 17.9 C, +0.4 C from the station mean2007: 19.3 C, +1.8 C from the station mean2008: 17.6 C, +0.1 C from the station mean2009: 17.4 C, -0.1 C from the station mean2010: 17.2 C, -0.3 C from the station mean19611965197019751980198519901995200020052010
One stripe for each of 27 complete years at Union de San Antonio, 1961 to 2010. Blue stripes are years cooler than the station's own mean of 17.5 C (63.4 F); red stripes are warmer. The coolest year was 1985, at 16.3 C (61.3 F), and the warmest was 2007, at 19.3 C (66.8 F). The strongest colour marks a difference of 1.9 C (3.4 F).
Annual mean temperature at Union de San Antonio as warming stripes, 1961 to 2010
YearAnnual mean temperatureDifference from the station mean
196117.7 C+0.20 C
196318.1 C+0.63 C
196616.9 C-0.52 C
196716.5 C-1.00 C
196817.2 C-0.31 C
196917.6 C+0.11 C
197017.8 C+0.35 C
197117.2 C-0.26 C
197217.8 C+0.37 C
197317.6 C+0.12 C
197617.0 C-0.43 C
197717.3 C-0.13 C
197817.3 C-0.20 C
197917.7 C+0.28 C
198017.9 C+0.43 C
198117.6 C+0.14 C
198218.4 C+0.89 C
198317.6 C+0.09 C
198417.5 C+0.07 C
198516.3 C-1.19 C
198616.8 C-0.66 C
200516.4 C-1.02 C
200617.9 C+0.45 C
200719.3 C+1.85 C
200817.6 C+0.12 C
200917.4 C-0.07 C
201017.2 C-0.26 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

1961 to 2011
Yearly extremes at Union de San Antonio: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)44.4 C (111.9 F)199935.0 C (95.0 F)49
Coldest night (TNn)-5.0 C (23.0 F)19700.0 C (32.0 F)49
Wettest day (Rx1day)104.9 mm (4.1 in)197648.8 mm (1.9 in)51
Wettest five days (Rx5day)213.9 mm (8.4 in)197695.3 mm (3.8 in)51
Longest dry spell (CDD)157 days199380 days51

Hottest day (TXx)

Hottest day (TXx) at Union de San Antonio by year The hottest day of the year at Union de San Antonio, 1961 to 2011. The record is 44.4 C (111.9 F) in 1999, marked on the chart; the median year is 35.0 C (95.0 F). 2030405019701980199020002010Record: 44.4 C (111.9 F) in 1999
The hottest day of the year at Union de San Antonio, 1961 to 2011. The record is 44.4 C (111.9 F) in 1999, marked on the chart; the median year is 35.0 C (95.0 F).
Hottest day (TXx) at Union de San Antonio by year
YearHottest day (TXx)
196135.0 C (95.0 F)
196235.0 C (95.0 F)
196337.8 C (100.0 F)
196433.9 C (93.0 F)
196536.7 C (98.1 F)
196633.9 C (93.0 F)
196732.8 C (91.0 F)
196833.9 C (93.0 F)
196935.0 C (95.0 F)
197032.8 C (91.0 F)
197132.8 C (91.0 F)
197232.8 C (91.0 F)
197335.0 C (95.0 F)
197435.0 C (95.0 F)
197533.9 C (93.0 F)
197632.8 C (91.0 F)
197732.8 C (91.0 F)
197833.9 C (93.0 F)
197935.0 C (95.0 F)
198036.7 C (98.1 F)
198133.9 C (93.0 F)
198235.6 C (96.1 F)
198337.8 C (100.0 F)
198433.9 C (93.0 F)
198532.8 C (91.0 F)
198635.0 C (95.0 F)
198738.9 C (102.0 F)
198836.1 C (97.0 F)
198938.3 C (100.9 F)
199030.6 C (87.1 F)
199123.3 C (73.9 F)
199230.0 C (86.0 F)
199341.7 C (107.1 F)
199441.7 C (107.1 F)
199529.4 C (84.9 F)
199628.9 C (84.0 F)
1997n/a
199828.9 C (84.0 F)
199944.4 C (111.9 F)
200040.6 C (105.1 F)
200131.1 C (88.0 F)
2002n/a
200325.0 C (77.0 F)
200434.4 C (93.9 F)
200533.9 C (93.0 F)
200635.6 C (96.1 F)
200736.7 C (98.1 F)
200835.6 C (96.1 F)
200935.0 C (95.0 F)
201035.0 C (95.0 F)
201135.6 C (96.1 F)

Coldest night (TNn)

Coldest night (TNn) at Union de San Antonio by year The coldest night of the year at Union de San Antonio, 1961 to 2011. The record is -5.0 C (23.0 F) in 1970, marked on the chart; the median year is 0.0 C (32.0 F). -5051019701980199020002010Record: -5.0 C (23.0 F) in 1970
The coldest night of the year at Union de San Antonio, 1961 to 2011. The record is -5.0 C (23.0 F) in 1970, marked on the chart; the median year is 0.0 C (32.0 F).
Coldest night (TNn) at Union de San Antonio by year
YearColdest night (TNn)
1961-1.1 C (30.0 F)
1962-2.2 C (28.0 F)
1963-3.3 C (26.1 F)
19640.6 C (33.1 F)
1965-3.3 C (26.1 F)
1966-1.1 C (30.0 F)
1967-3.3 C (26.1 F)
19680.0 C (32.0 F)
1969-2.8 C (27.0 F)
1970-5.0 C (23.0 F)
1971-2.2 C (28.0 F)
1972-3.3 C (26.1 F)
1973-3.3 C (26.1 F)
19740.6 C (33.1 F)
1975-1.1 C (30.0 F)
1976-3.3 C (26.1 F)
19770.0 C (32.0 F)
1978-0.6 C (30.9 F)
19790.6 C (33.1 F)
19800.6 C (33.1 F)
19810.6 C (33.1 F)
1982-1.7 C (28.9 F)
19830.6 C (33.1 F)
19840.6 C (33.1 F)
1985-4.4 C (24.1 F)
1986-3.3 C (26.1 F)
19874.4 C (39.9 F)
1988-1.7 C (28.9 F)
19890.0 C (32.0 F)
19905.0 C (41.0 F)
19918.3 C (46.9 F)
19923.9 C (39.0 F)
19930.0 C (32.0 F)
19940.0 C (32.0 F)
19951.7 C (35.1 F)
19968.9 C (48.0 F)
1997n/a
199810.0 C (50.0 F)
19991.7 C (35.1 F)
20002.8 C (37.0 F)
20016.7 C (44.1 F)
2002n/a
20030.6 C (33.1 F)
20040.0 C (32.0 F)
20053.9 C (39.0 F)
20060.0 C (32.0 F)
20070.0 C (32.0 F)
20080.0 C (32.0 F)
20091.7 C (35.1 F)
2010-3.3 C (26.1 F)
20111.7 C (35.1 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Union de San Antonio by year The wettest day of the year at Union de San Antonio, 1961 to 2011. The record is 104.9 mm (4.1 in) in 1976, marked on the chart; the median year is 48.8 mm (1.9 in). 025507510012519701980199020002010Record: 104.9 mm (4.1 in) in 1976
The wettest day of the year at Union de San Antonio, 1961 to 2011. The record is 104.9 mm (4.1 in) in 1976, marked on the chart; the median year is 48.8 mm (1.9 in).
Wettest day (Rx1day) at Union de San Antonio by year
YearWettest day (Rx1day)
196141.4 mm (1.6 in)
196257.9 mm (2.3 in)
196364.8 mm (2.6 in)
196469.9 mm (2.8 in)
196556.9 mm (2.2 in)
196650.8 mm (2.0 in)
196741.9 mm (1.6 in)
196847.8 mm (1.9 in)
196935.8 mm (1.4 in)
197041.9 mm (1.6 in)
197152.8 mm (2.1 in)
197234.8 mm (1.4 in)
197339.9 mm (1.6 in)
197439.9 mm (1.6 in)
197539.4 mm (1.6 in)
1976104.9 mm (4.1 in)
197755.9 mm (2.2 in)
197847.0 mm (1.9 in)
197947.8 mm (1.9 in)
198025.4 mm (1.0 in)
198149.8 mm (2.0 in)
198241.4 mm (1.6 in)
198377.2 mm (3.0 in)
198454.4 mm (2.1 in)
198530.0 mm (1.2 in)
198638.9 mm (1.5 in)
198730.0 mm (1.2 in)
198845.2 mm (1.8 in)
198970.4 mm (2.8 in)
199040.1 mm (1.6 in)
19917.6 mm (0.30 in)
199253.3 mm (2.1 in)
199334.8 mm (1.4 in)
199457.9 mm (2.3 in)
199573.4 mm (2.9 in)
199647.8 mm (1.9 in)
199741.4 mm (1.6 in)
199847.5 mm (1.9 in)
199948.8 mm (1.9 in)
200054.9 mm (2.2 in)
200146.7 mm (1.8 in)
200298.8 mm (3.9 in)
200393.0 mm (3.7 in)
200452.1 mm (2.1 in)
200543.7 mm (1.7 in)
200662.2 mm (2.4 in)
200771.4 mm (2.8 in)
200853.6 mm (2.1 in)
200978.5 mm (3.1 in)
201071.6 mm (2.8 in)
201151.8 mm (2.0 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Union de San Antonio by year The wettest five days of the year at Union de San Antonio, 1961 to 2011. The record is 213.9 mm (8.4 in) in 1976, marked on the chart; the median year is 95.3 mm (3.8 in). 05010015020025019701980199020002010Record: 213.9 mm (8.4 in) in 1976
The wettest five days of the year at Union de San Antonio, 1961 to 2011. The record is 213.9 mm (8.4 in) in 1976, marked on the chart; the median year is 95.3 mm (3.8 in).
Wettest five days (Rx5day) at Union de San Antonio by year
YearWettest five days (Rx5day)
196174.7 mm (2.9 in)
1962144.8 mm (5.7 in)
1963177.4 mm (7.0 in)
196476.5 mm (3.0 in)
1965151.9 mm (6.0 in)
196681.6 mm (3.2 in)
1967129.5 mm (5.1 in)
196886.7 mm (3.4 in)
196985.1 mm (3.4 in)
1970105.5 mm (4.2 in)
1971114.2 mm (4.5 in)
197265.5 mm (2.6 in)
1973103.5 mm (4.1 in)
197493.2 mm (3.7 in)
197594.9 mm (3.7 in)
1976213.9 mm (8.4 in)
197797.8 mm (3.9 in)
197893.0 mm (3.7 in)
197983.6 mm (3.3 in)
198071.7 mm (2.8 in)
198190.8 mm (3.6 in)
198285.9 mm (3.4 in)
1983137.9 mm (5.4 in)
198485.1 mm (3.4 in)
198580.2 mm (3.2 in)
1986112.6 mm (4.4 in)
198752.6 mm (2.1 in)
1988125.8 mm (5.0 in)
198995.3 mm (3.8 in)
199081.3 mm (3.2 in)
199114.9 mm (0.6 in)
1992113.5 mm (4.5 in)
199376.7 mm (3.0 in)
1994106.9 mm (4.2 in)
1995117.4 mm (4.6 in)
1996111.1 mm (4.4 in)
199764.3 mm (2.5 in)
1998105.9 mm (4.2 in)
199992.0 mm (3.6 in)
200072.1 mm (2.8 in)
200196.2 mm (3.8 in)
2002168.7 mm (6.6 in)
2003180.2 mm (7.1 in)
2004113.4 mm (4.5 in)
200572.4 mm (2.9 in)
200685.8 mm (3.4 in)
2007107.5 mm (4.2 in)
2008143.2 mm (5.6 in)
2009106.2 mm (4.2 in)
2010124.7 mm (4.9 in)
201190.2 mm (3.6 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Union de San Antonio by year The longest dry spell of the year at Union de San Antonio, 1961 to 2011. The record is 157 days in 1993, marked on the chart; the median year is 80 days. 05010015020019701980199020002010Record: 157 days in 1993
The longest dry spell of the year at Union de San Antonio, 1961 to 2011. The record is 157 days in 1993, marked on the chart; the median year is 80 days.
Longest dry spell (CDD) at Union de San Antonio by year
YearLongest dry spell (CDD)
1961112 days
196260 days
196358 days
196444 days
196553 days
196657 days
1967125 days
196840 days
196995 days
197097 days
1971135 days
1972146 days
197373 days
197475 days
197587 days
1976130 days
197780 days
197844 days
197963 days
198068 days
198136 days
198262 days
1983124 days
198475 days
198598 days
1986118 days
198750 days
198861 days
1989153 days
199065 days
199149 days
199231 days
1993157 days
199478 days
1995114 days
1996113 days
199738 days
1998157 days
199984 days
2000140 days
2001130 days
200295 days
200399 days
200453 days
200594 days
200649 days
2007110 days
2008103 days
200973 days
201052 days
201180 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

42 years, 1961 to 2010

A day with at least 49.8 mm (2.0 in) of rain is expected about once in 2 years. A day with at least 119.8 mm (4.7 in) of rain is expected about once in 100 years.

Rainfall return levels at Union de San Antonio: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years49.8 mm (2.0 in)
5 years65.5 mm (2.6 in)
10 years77.1 mm (3.0 in)
25 years93.0 mm (3.7 in)
50 years105.9 mm (4.2 in)Longer than the 42 years of record
100 years119.8 mm (4.7 in)Longer than the 42 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, 42 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: 104.9 mm (4.1 in) in 1976; 98.8 mm (3.9 in) in 2002; 93.0 mm (3.7 in) in 2003.

Download the Data

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