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San Juan Londo Weather Records (MXN00003099)

Record envelope, standing records and threshold days for San Juan Londo (MXN00003099), Mexico, with 39 years of record.

Key Facts for San Juan Londo

  • San Juan Londo (MXN00003099) is a weather station in Mexico at 26.22 latitude and -111.47 longitude, 40 m (131 ft) above sea level.
  • The station reports from 1974 to 2012, 39 years of record.
  • 1,464 records set at San Juan Londo still stand.
  • Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
  • San Juan Londo set a daily record high maximum temperature of 32.8 C (91.0 F) on 22 December 2012.

About the Station

  • Location: Mexico, 26.22 latitude, -111.47 longitude.
  • Elevation: 40 m (131 ft).
  • Period of record: 1974 to 2012, 39 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 Juan Londo, with 2026 drawn through them The band shows the record high and record low for each calendar day at San Juan Londo. 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 San Juan Londo. 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 Juan Londo, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan35.0 C (95.0 F)0.0 C (32.0 F)n/an/a
Feb36.7 C (98.1 F)0.0 C (32.0 F)n/an/a
Mar38.9 C (102.0 F)1.1 C (34.0 F)n/an/a
Apr42.8 C (109.0 F)3.9 C (39.0 F)n/an/a
May45.0 C (113.0 F)5.6 C (42.1 F)n/an/a
Jun46.1 C (115.0 F)10.0 C (50.0 F)n/an/a
Jul45.6 C (114.1 F)13.9 C (57.0 F)n/an/a
Aug45.0 C (113.0 F)15.0 C (59.0 F)n/an/a
Sep44.4 C (111.9 F)8.9 C (48.0 F)n/an/a
Oct43.9 C (111.0 F)6.1 C (43.0 F)n/an/a
Nov38.9 C (102.0 F)2.8 C (37.0 F)n/an/a
Dec38.9 C (102.0 F)-1.1 C (30.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at San Juan Londo by the year they were set 1,464 records at San Juan Londo still stand. 1986 holds the most, with 65. 0204060801974: 51975: 531976: 361977: 521978: 591979: 381980: 151981: 531982: 291983: 541984: 461985: 631986: 651987: 601988: 391989: 461990: 471991: 331992: 221993: 351994: 221995: 531996: 471997: 341998: 411999: 472000: 522001: 122002: 342003: 122004: 302005: 152006: 192007: 312008: 382009: 342010: 362011: 372012: 201974197819821986199019941998200220062010
1,464 records at San Juan Londo still stand. 1986 holds the most, with 65.
Standing records at San Juan Londo by the year they were set
Year setStanding records
19745
197553
197636
197752
197859
197938
198015
198153
198229
198354
198446
198563
198665
198760
198839
198946
199047
199133
199222
199335
199422
199553
199647
199734
199841
199947
200052
200112
200234
200312
200430
200515
200619
200731
200838
200934
201036
201137
201220

All-Time Record Progression

3 new records
When San Juan Londo set new all-time records 3 all-time records were set at San Juan Londo between 20 January 2008 and 14 July 2009. Each dot is a new record. Record low maximum temperatureRecord high minimum temperature20 January 2008: Record low maximum temperature 12.8 C (55.0 F)1 September 2008: Record high minimum temperature 33.9 C (93.0 F)14 July 2009: Record high minimum temperature 35.0 C (95.0 F)2010
3 all-time records were set at San Juan Londo between 20 January 2008 and 14 July 2009. Each dot is a new record.
When San Juan Londo set new all-time records
DateKindDetail
2008-01-20Record low maximum temperatureRecord low maximum temperature 12.8 C (55.0 F)
2008-09-01Record high minimum temperatureRecord high minimum temperature 33.9 C (93.0 F)
2009-07-14Record high minimum temperatureRecord high minimum temperature 35.0 C (95.0 F)

Wettest Day of Each Month

Sep: 259.8 mm (10.2 in)
Record daily precipitation for each month at San Juan Londo The wettest day on record for each calendar month at San Juan Londo. The most was 259.8 mm (10.2 in) on 1 September 2006. 0100200300 Jan: 55.9 mm (2.2 in), 5 January 1993 Jan Feb: 34.8 mm (1.4 in), 2 February 1992 Feb Mar: 17.3 mm (0.7 in), 2 March 1983 Mar Apr: 7.9 mm (0.31 in), 4 April 1992 Apr May: 2.8 mm (0.11 in), 26 May 2005 May Jun: 2.8 mm (0.11 in), 27 June 1999 Jun Jul: 48.8 mm (1.9 in), 13 July 1984 Jul Aug: 179.8 mm (7.1 in), 24 August 2008 Aug Sep: 259.8 mm (10.2 in), 1 September 2006 Sep Oct: 125.0 mm (4.9 in), 16 October 2012 Oct Nov: 53.8 mm (2.1 in), 12 November 1991 Nov Dec: 79.8 mm (3.1 in), 15 December 1990 Dec
The wettest day on record for each calendar month at San Juan Londo. The most was 259.8 mm (10.2 in) on 1 September 2006.
Record daily precipitation for each month at San Juan Londo
MonthRecord daily precipitation (mm)Date
Jan55.9 mm (2.2 in)5 January 1993
Feb34.8 mm (1.4 in)2 February 1992
Mar17.3 mm (0.7 in)2 March 1983
Apr7.9 mm (0.31 in)4 April 1992
May2.8 mm (0.11 in)26 May 2005
Jun2.8 mm (0.11 in)27 June 1999
Jul48.8 mm (1.9 in)13 July 1984
Aug179.8 mm (7.1 in)24 August 2008
Sep259.8 mm (10.2 in)1 September 2006
Oct125.0 mm (4.9 in)16 October 2012
Nov53.8 mm (2.1 in)12 November 1991
Dec79.8 mm (3.1 in)15 December 1990

Period of Record Coverage

1974 to 2012
Days with data per year at San Juan Londo 39 years of record at San Juan Londo, 1974 to 2012. 9 years have data for under 90 percent of days and are left out of rankings: 1974, 1977, 1978, 1979, 1980, 1981, 1982, 1989 and others. 1974: 122 of 365 days1975: 365 of 365 days1976: 366 of 366 days1977: 327 of 365 days1978: 288 of 365 days1979: 312 of 365 days1980: 122 of 366 days1981: 261 of 365 days1982: 206 of 365 days1983: 334 of 365 days1984: 366 of 366 days1985: 359 of 365 days1986: 365 of 365 days1987: 365 of 365 days1988: 336 of 366 days1989: 275 of 365 days1990: 365 of 365 days1991: 365 of 365 days1992: 366 of 366 days1993: 365 of 365 days1994: 365 of 365 days1995: 364 of 365 days1996: 366 of 366 days1997: 365 of 365 days1998: 365 of 365 days1999: 364 of 365 days2000: 366 of 366 days2001: 160 of 365 days2002: 365 of 365 days2003: 365 of 365 days2004: 335 of 366 days2005: 365 of 365 days2006: 365 of 365 days2007: 364 of 365 days2008: 365 of 366 days2009: 363 of 365 days2010: 365 of 365 days2011: 364 of 365 days2012: 364 of 366 days19751980198519901995200020052010
39 years of record at San Juan Londo, 1974 to 2012. 9 years have data for under 90 percent of days and are left out of rankings: 1974, 1977, 1978, 1979, 1980, 1981, 1982, 1989 and others.
Days with data per year at San Juan Londo
YearDays with dataShare of yearComplete
197412233%No
1975365100%Yes
1976366100%Yes
197732790%No
197828879%No
197931285%No
198012233%No
198126172%No
198220656%No
198333492%Yes
1984366100%Yes
198535998%Yes
1986365100%Yes
1987365100%Yes
198833692%Yes
198927575%No
1990365100%Yes
1991365100%Yes
1992366100%Yes
1993365100%Yes
1994365100%Yes
1995364100%Yes
1996366100%Yes
1997365100%Yes
1998365100%Yes
1999364100%Yes
2000366100%Yes
200116044%No
2002365100%Yes
2003365100%Yes
200433592%Yes
2005365100%Yes
2006365100%Yes
2007364100%Yes
2008365100%Yes
200936399%Yes
2010365100%Yes
2011364100%Yes
201236499%Yes

Latest Records

20
Latest records at San Juan Londo
DateStationRecordValueBeat old record byOld record stoodSignificance
22 December 2012San Juan Londo, MXdaily high max32.8 C (91.0 F)2.2 C (4.0 F)24 years16 of 100 (Routine)
21 December 2012San Juan Londo, MXdaily high min (Tie)12.8 C (55.0 F)tie26 years2 of 100 (Routine)
23 November 2012San Juan Londo, MXdaily low min (Tie)5.6 C (42.1 F)tie25 years2 of 100 (Routine)
20 November 2012San Juan Londo, MXdaily high min18.9 C (66.0 F)0.6 C (1.1 F)22 years10 of 100 (Routine)
18 November 2012San Juan Londo, MXdaily high min20.0 C (68.0 F)1.1 C (2.0 F)26 years13 of 100 (Routine)
17 November 2012San Juan Londo, MXdaily high min (Tie)15.6 C (60.1 F)tie36 years3 of 100 (Routine)
11 November 2012San Juan Londo, MXdaily low max (Tie)23.9 C (75.0 F)tie30 years3 of 100 (Routine)
9 November 2012San Juan Londo, MXdaily high min (Tie)16.7 C (62.1 F)tie3 years0 of 100 (Routine)
17 October 2012San Juan Londo, MXdaily high min (Tie)20.6 C (69.1 F)tie33 years3 of 100 (Routine)
16 October 2012San Juan Londo, MXmonthly rain125.0 mm (4.9 in)40.2 mm (1.6 in)4 years54 of 100 (Notable)
15 October 2012San Juan Londo, MXdaily low max27.8 C (82.0 F)1.1 C (2.0 F)18 years11 of 100 (Routine)
13 October 2012San Juan Londo, MXdaily low max (Tie)28.9 C (84.0 F)tie4 years1 of 100 (Routine)
7 October 2012San Juan Londo, MXdaily low min11.7 C (53.1 F)2.2 C (4.0 F)14 years12 of 100 (Routine)
27 September 2012San Juan Londo, MXdaily rain89.9 mm (3.5 in)70.1 mm (2.8 in)11 years19 of 100 (Routine)
25 September 2012San Juan Londo, MXdaily rain3.8 mm (0.15 in)3.8 mm (0.15 in)38 years14 of 100 (Routine)
5 September 2012San Juan Londo, MXdaily rain24.9 mm (1.0 in)9.2 mm (0.36 in)22 years10 of 100 (Routine)
25 August 2012San Juan Londo, MXdaily high min (Tie)27.8 C (82.0 F)tie1 year0 of 100 (Routine)
18 August 2012San Juan Londo, MXdaily low max (Tie)33.9 C (93.0 F)tie29 years2 of 100 (Routine)
16 August 2012San Juan Londo, MXdaily rain81.8 mm (3.2 in)58.9 mm (2.3 in)29 years33 of 100 (Routine)
14 August 2012San Juan Londo, MXdaily high min (Tie)28.9 C (84.0 F)tie2 years0 of 100 (Routine)

Climate Trend

27 complete years, 1975 to 2012
Annual mean temperature at San Juan Londo as warming stripes, 1975 to 2012 One stripe for each of 27 complete years at San Juan Londo, 1975 to 2012. Blue stripes are years cooler than the station's own mean of 23.1 C (73.6 F); red stripes are warmer. The coolest year was 2002, at 22.6 C (72.6 F), and the warmest was 1986, at 24.0 C (75.2 F). The strongest colour marks a difference of 0.9 C (1.6 F). 1975: 22.8 C, -0.3 C from the station mean1976: 23.3 C, +0.1 C from the station mean1984: 22.9 C, -0.2 C from the station mean1985: 23.0 C, -0.1 C from the station mean1986: 24.0 C, +0.9 C from the station mean1987: 23.1 C, 0.0 C from the station mean1990: 22.8 C, -0.3 C from the station mean1991: 22.6 C, -0.5 C from the station mean1992: 22.8 C, -0.3 C from the station mean1993: 23.1 C, 0.0 C from the station mean1994: 23.1 C, 0.0 C from the station mean1995: 22.8 C, -0.3 C from the station mean1996: 23.1 C, -0.1 C from the station mean1997: 23.2 C, +0.1 C from the station mean1998: 23.0 C, -0.2 C from the station mean1999: 22.9 C, -0.2 C from the station mean2000: 22.9 C, -0.2 C from the station mean2002: 22.6 C, -0.6 C from the station mean2003: 22.8 C, -0.3 C from the station mean2005: 22.9 C, -0.2 C from the station mean2006: 23.6 C, +0.5 C from the station mean2007: 23.2 C, +0.1 C from the station mean2008: 23.4 C, +0.3 C from the station mean2009: 23.8 C, +0.7 C from the station mean2010: 23.1 C, 0.0 C from the station mean2011: 23.8 C, +0.7 C from the station mean2012: 23.7 C, +0.6 C from the station mean19751980198519901995200020052010
One stripe for each of 27 complete years at San Juan Londo, 1975 to 2012. Blue stripes are years cooler than the station's own mean of 23.1 C (73.6 F); red stripes are warmer. The coolest year was 2002, at 22.6 C (72.6 F), and the warmest was 1986, at 24.0 C (75.2 F). The strongest colour marks a difference of 0.9 C (1.6 F).
Annual mean temperature at San Juan Londo as warming stripes, 1975 to 2012
YearAnnual mean temperatureDifference from the station mean
197522.8 C-0.32 C
197623.3 C+0.13 C
198422.9 C-0.23 C
198523.0 C-0.12 C
198624.0 C+0.86 C
198723.1 C+0.01 C
199022.8 C-0.33 C
199122.6 C-0.52 C
199222.8 C-0.30 C
199323.1 C-0.02 C
199423.1 C-0.03 C
199522.8 C-0.33 C
199623.1 C-0.06 C
199723.2 C+0.12 C
199823.0 C-0.16 C
199922.9 C-0.23 C
200022.9 C-0.23 C
200222.6 C-0.56 C
200322.8 C-0.33 C
200522.9 C-0.19 C
200623.6 C+0.46 C
200723.2 C+0.06 C
200823.4 C+0.29 C
200923.8 C+0.68 C
201023.1 C+0.01 C
201123.8 C+0.67 C
201223.7 C+0.61 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

1974 to 2012
Yearly extremes at San Juan Londo: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)46.1 C (115.0 F)197942.8 C (109.0 F)39
Coldest night (TNn)-1.1 C (30.0 F)19881.1 C (34.0 F)39
Wettest day (Rx1day)259.8 mm (10.2 in)200645.0 mm (1.8 in)39
Wettest five days (Rx5day)259.8 mm (10.2 in)200656.7 mm (2.2 in)39
Longest dry spell (CDD)237 days2011181 days39

Hottest day (TXx)

Hottest day (TXx) at San Juan Londo by year The hottest day of the year at San Juan Londo, 1974 to 2012. The record is 46.1 C (115.0 F) in 1979, marked on the chart; the median year is 42.8 C (109.0 F). 40424446481980199020002010Record: 46.1 C (115.0 F) in 1979
The hottest day of the year at San Juan Londo, 1974 to 2012. The record is 46.1 C (115.0 F) in 1979, marked on the chart; the median year is 42.8 C (109.0 F).
Hottest day (TXx) at San Juan Londo by year
YearHottest day (TXx)
197442.2 C (108.0 F)
197542.8 C (109.0 F)
197644.4 C (111.9 F)
197743.3 C (109.9 F)
197845.6 C (114.1 F)
197946.1 C (115.0 F)
198041.7 C (107.1 F)
198145.0 C (113.0 F)
198242.8 C (109.0 F)
198342.8 C (109.0 F)
198441.7 C (107.1 F)
198545.0 C (113.0 F)
198645.0 C (113.0 F)
198745.0 C (113.0 F)
198843.9 C (111.0 F)
198945.0 C (113.0 F)
199041.1 C (106.0 F)
199141.7 C (107.1 F)
199243.9 C (111.0 F)
199344.4 C (111.9 F)
199443.9 C (111.0 F)
199542.2 C (108.0 F)
199643.9 C (111.0 F)
199744.4 C (111.9 F)
199845.0 C (113.0 F)
199943.9 C (111.0 F)
200042.2 C (108.0 F)
200140.0 C (104.0 F)
200242.8 C (109.0 F)
200341.7 C (107.1 F)
200440.6 C (105.1 F)
200541.7 C (107.1 F)
200641.7 C (107.1 F)
200745.0 C (113.0 F)
200842.8 C (109.0 F)
200943.9 C (111.0 F)
201042.8 C (109.0 F)
201142.8 C (109.0 F)
201242.8 C (109.0 F)

Coldest night (TNn)

Coldest night (TNn) at San Juan Londo by year The coldest night of the year at San Juan Londo, 1974 to 2012. The record is -1.1 C (30.0 F) in 1988, marked on the chart; the median year is 1.1 C (34.0 F). -2024681980199020002010Record: -1.1 C (30.0 F) in 1988
The coldest night of the year at San Juan Londo, 1974 to 2012. The record is -1.1 C (30.0 F) in 1988, marked on the chart; the median year is 1.1 C (34.0 F).
Coldest night (TNn) at San Juan Londo by year
YearColdest night (TNn)
19746.7 C (44.1 F)
19752.8 C (37.0 F)
19761.7 C (35.1 F)
19773.3 C (37.9 F)
19783.3 C (37.9 F)
19793.9 C (39.0 F)
19806.7 C (44.1 F)
19813.9 C (39.0 F)
19821.7 C (35.1 F)
19830.6 C (33.1 F)
19841.7 C (35.1 F)
19850.0 C (32.0 F)
19860.0 C (32.0 F)
19870.0 C (32.0 F)
1988-1.1 C (30.0 F)
19890.6 C (33.1 F)
19900.0 C (32.0 F)
19910.6 C (33.1 F)
19920.6 C (33.1 F)
19932.8 C (37.0 F)
19940.6 C (33.1 F)
19951.1 C (34.0 F)
19960.6 C (33.1 F)
19970.0 C (32.0 F)
19981.1 C (34.0 F)
19990.0 C (32.0 F)
20000.0 C (32.0 F)
20010.6 C (33.1 F)
20021.7 C (35.1 F)
20030.0 C (32.0 F)
20040.0 C (32.0 F)
20051.7 C (35.1 F)
20061.7 C (35.1 F)
20070.0 C (32.0 F)
20080.0 C (32.0 F)
20091.7 C (35.1 F)
20101.7 C (35.1 F)
20111.7 C (35.1 F)
20122.8 C (37.0 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at San Juan Londo by year The wettest day of the year at San Juan Londo, 1974 to 2012. The record is 259.8 mm (10.2 in) in 2006, marked on the chart; the median year is 45.0 mm (1.8 in). 01002003001980199020002010Record: 259.8 mm (10.2 in) in 2006
The wettest day of the year at San Juan Londo, 1974 to 2012. The record is 259.8 mm (10.2 in) in 2006, marked on the chart; the median year is 45.0 mm (1.8 in).
Wettest day (Rx1day) at San Juan Londo by year
YearWettest day (Rx1day)
197491.4 mm (3.6 in)
19755.8 mm (0.23 in)
197637.8 mm (1.5 in)
197740.4 mm (1.6 in)
197837.8 mm (1.5 in)
1979244.9 mm (9.6 in)
19800.0 mm (0.00 in)
198146.0 mm (1.8 in)
198215.7 mm (0.6 in)
198345.0 mm (1.8 in)
198448.8 mm (1.9 in)
198525.9 mm (1.0 in)
198632.8 mm (1.3 in)
19879.9 mm (0.39 in)
198816.8 mm (0.7 in)
198917.3 mm (0.7 in)
199079.8 mm (3.1 in)
199153.8 mm (2.1 in)
199234.8 mm (1.4 in)
199355.9 mm (2.2 in)
199463.0 mm (2.5 in)
19959.9 mm (0.39 in)
199655.9 mm (2.2 in)
1997110.0 mm (4.3 in)
199831.8 mm (1.3 in)
199918.8 mm (0.7 in)
200025.9 mm (1.0 in)
200174.9 mm (2.9 in)
200210.4 mm (0.4 in)
2003140.0 mm (5.5 in)
200469.9 mm (2.8 in)
200517.8 mm (0.7 in)
2006259.8 mm (10.2 in)
200799.8 mm (3.9 in)
2008179.8 mm (7.1 in)
2009140.0 mm (5.5 in)
2010185.9 mm (7.3 in)
201119.8 mm (0.8 in)
2012125.0 mm (4.9 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at San Juan Londo by year The wettest five days of the year at San Juan Londo, 1974 to 2012. The record is 259.8 mm (10.2 in) in 2006, marked on the chart; the median year is 56.7 mm (2.2 in). 01002003001980199020002010Record: 259.8 mm (10.2 in) in 2006
The wettest five days of the year at San Juan Londo, 1974 to 2012. The record is 259.8 mm (10.2 in) in 2006, marked on the chart; the median year is 56.7 mm (2.2 in).
Wettest five days (Rx5day) at San Juan Londo by year
YearWettest five days (Rx5day)
1974136.1 mm (5.4 in)
19757.4 mm (0.29 in)
197641.6 mm (1.6 in)
197740.4 mm (1.6 in)
197841.1 mm (1.6 in)
1979256.8 mm (10.1 in)
19800.0 mm (0.00 in)
198177.5 mm (3.1 in)
198227.1 mm (1.1 in)
198381.7 mm (3.2 in)
198473.7 mm (2.9 in)
198525.9 mm (1.0 in)
198638.6 mm (1.5 in)
198715.2 mm (0.6 in)
198816.8 mm (0.7 in)
198917.3 mm (0.7 in)
1990110.8 mm (4.4 in)
199162.4 mm (2.5 in)
199241.7 mm (1.6 in)
199356.7 mm (2.2 in)
199463.0 mm (2.5 in)
199518.6 mm (0.7 in)
1996115.4 mm (4.5 in)
1997176.8 mm (7.0 in)
199836.6 mm (1.4 in)
199918.8 mm (0.7 in)
200028.2 mm (1.1 in)
2001164.6 mm (6.5 in)
200217.6 mm (0.7 in)
2003140.0 mm (5.5 in)
2004122.7 mm (4.8 in)
200524.9 mm (1.0 in)
2006259.8 mm (10.2 in)
200799.8 mm (3.9 in)
2008179.8 mm (7.1 in)
2009142.8 mm (5.6 in)
2010185.9 mm (7.3 in)
201119.8 mm (0.8 in)
2012153.4 mm (6.0 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at San Juan Londo by year The longest dry spell of the year at San Juan Londo, 1974 to 2012. The record is 237 days in 2011, marked on the chart; the median year is 181 days. 0501001502002501980199020002010Record: 237 days in 2011
The longest dry spell of the year at San Juan Londo, 1974 to 2012. The record is 237 days in 2011, marked on the chart; the median year is 181 days.
Longest dry spell (CDD) at San Juan Londo by year
YearLongest dry spell (CDD)
197440 days
1975225 days
1976156 days
197795 days
197862 days
1979107 days
1980122 days
198175 days
198265 days
1983124 days
1984158 days
1985148 days
1986231 days
1987210 days
1988209 days
1989196 days
1990181 days
1991213 days
1992129 days
1993174 days
1994234 days
1995179 days
1996184 days
1997188 days
1998159 days
1999177 days
2000211 days
200189 days
2002224 days
2003190 days
200447 days
200581 days
2006192 days
2007223 days
2008195 days
2009185 days
2010188 days
2011237 days
2012188 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

31 years, 1975 to 2012

A day with at least 47.2 mm (1.9 in) of rain is expected about once in 2 years. A day with at least 346.8 mm (13.7 in) of rain is expected about once in 100 years.

Rainfall return levels at San Juan Londo: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years47.2 mm (1.9 in)
5 years95.9 mm (3.8 in)
10 years138.1 mm (5.4 in)
25 years206.0 mm (8.1 in)
50 years269.6 mm (10.6 in)Longer than the 31 years of record
100 years346.8 mm (13.7 in)Longer than the 31 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, 31 years of values from 1975 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: 259.8 mm (10.2 in) in 2006; 185.9 mm (7.3 in) in 2010; 179.8 mm (7.1 in) in 2008.

Download the Data

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