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San Juan Tlacotenco Weather Records (MXN00017039)

Record envelope, standing records and threshold days for San Juan Tlacotenco (MXN00017039), Mexico, with 38 years of record.

Key Facts for San Juan Tlacotenco

  • San Juan Tlacotenco (MXN00017039) is a weather station in Mexico at 19.03 latitude and -99.08 longitude, 2,836 m (9,304 ft) above sea level.
  • The station reports from 1975 to 2012, 38 years of record.
  • 1,464 records set at San Juan Tlacotenco still stand.
  • Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
  • San Juan Tlacotenco set a daily record low maximum temperature of 13.9 C (57.0 F) on 30 October 2012.

About the Station

  • Location: Mexico, 19.03 latitude, -99.08 longitude.
  • Elevation: 2,836 m (9,304 ft).
  • Period of record: 1975 to 2012, 38 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 Tlacotenco, with 2026 drawn through them The band shows the record high and record low for each calendar day at San Juan Tlacotenco. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -10010203040 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at San Juan Tlacotenco. 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 Tlacotenco, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan23.9 C (75.0 F)0.0 C (32.0 F)n/an/a
Feb26.7 C (80.1 F)-3.3 C (26.1 F)n/an/a
Mar30.0 C (86.0 F)3.9 C (39.0 F)n/an/a
Apr31.7 C (89.1 F)3.9 C (39.0 F)n/an/a
May32.8 C (91.0 F)6.7 C (44.1 F)n/an/a
Jun30.0 C (86.0 F)6.7 C (44.1 F)n/an/a
Jul25.0 C (77.0 F)6.7 C (44.1 F)n/an/a
Aug25.0 C (77.0 F)7.8 C (46.0 F)n/an/a
Sep25.0 C (77.0 F)6.7 C (44.1 F)n/an/a
Oct25.0 C (77.0 F)2.8 C (37.0 F)n/an/a
Nov26.7 C (80.1 F)1.7 C (35.1 F)n/an/a
Dec23.9 C (75.0 F)0.0 C (32.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at San Juan Tlacotenco by the year they were set 1,464 records at San Juan Tlacotenco still stand. 1998 holds the most, with 80. 0204060801975: 351976: 531977: 701978: 571979: 601980: 331981: 391982: 451983: 711984: 421985: 331986: 171987: 351988: 421989: 491990: 451991: 391992: 381993: 331994: 271995: 531996: 281997: 521998: 801999: 222000: 232001: 242002: 172003: 672004: 212005: 132006: 462007: 172008: 212009: 342010: 432011: 162012: 241975197919831987199119951999200320072011
1,464 records at San Juan Tlacotenco still stand. 1998 holds the most, with 80.
Standing records at San Juan Tlacotenco by the year they were set
Year setStanding records
197535
197653
197770
197857
197960
198033
198139
198245
198371
198442
198533
198617
198735
198842
198949
199045
199139
199238
199333
199427
199553
199628
199752
199880
199922
200023
200124
200217
200367
200421
200513
200646
200717
200821
200934
201043
201116
201224

All-Time Record Progression

2 new records
When San Juan Tlacotenco set new all-time records 2 all-time records were set at San Juan Tlacotenco between 3 February 2010 and 30 June 2011. Each dot is a new record. Record daily precipitation3 February 2010: Record daily precipitation 160.5 mm (6.3 in)30 June 2011: Record daily precipitation 218.2 mm (8.6 in)2010
2 all-time records were set at San Juan Tlacotenco between 3 February 2010 and 30 June 2011. Each dot is a new record.
When San Juan Tlacotenco set new all-time records
DateKindDetail
2010-02-03Record daily precipitationRecord daily precipitation 160.5 mm (6.3 in)
2011-06-30Record daily precipitationRecord daily precipitation 218.2 mm (8.6 in)

Wettest Day of Each Month

Jun: 218.2 mm (8.6 in)
Record daily precipitation for each month at San Juan Tlacotenco The wettest day on record for each calendar month at San Juan Tlacotenco. The most was 218.2 mm (8.6 in) on 30 June 2011. 0100200300 Jan: 62.5 mm (2.5 in), 26 January 1980 Jan Feb: 160.5 mm (6.3 in), 3 February 2010 Feb Mar: 32.5 mm (1.3 in), 4 March 1988 Mar Apr: 39.4 mm (1.6 in), 13 April 1985 Apr May: 91.2 mm (3.6 in), 20 May 1982 May Jun: 218.2 mm (8.6 in), 30 June 2011 Jun Jul: 91.9 mm (3.6 in), 11 July 2012 Jul Aug: 147.3 mm (5.8 in), 22 August 1976 Aug Sep: 84.3 mm (3.3 in), 22 September 1996 Sep Oct: 134.9 mm (5.3 in), 10 October 2011 Oct Nov: 54.4 mm (2.1 in), 6 November 1992 Nov Dec: 48.5 mm (1.9 in), 30 December 1995 Dec
The wettest day on record for each calendar month at San Juan Tlacotenco. The most was 218.2 mm (8.6 in) on 30 June 2011.
Record daily precipitation for each month at San Juan Tlacotenco
MonthRecord daily precipitation (mm)Date
Jan62.5 mm (2.5 in)26 January 1980
Feb160.5 mm (6.3 in)3 February 2010
Mar32.5 mm (1.3 in)4 March 1988
Apr39.4 mm (1.6 in)13 April 1985
May91.2 mm (3.6 in)20 May 1982
Jun218.2 mm (8.6 in)30 June 2011
Jul91.9 mm (3.6 in)11 July 2012
Aug147.3 mm (5.8 in)22 August 1976
Sep84.3 mm (3.3 in)22 September 1996
Oct134.9 mm (5.3 in)10 October 2011
Nov54.4 mm (2.1 in)6 November 1992
Dec48.5 mm (1.9 in)30 December 1995

Period of Record Coverage

1975 to 2012
Days with data per year at San Juan Tlacotenco 38 years of record at San Juan Tlacotenco, 1975 to 2012. 5 years have data for under 90 percent of days and are left out of rankings: 1975, 1980, 1986, 1987, 2012. 1975: 143 of 365 days1976: 365 of 366 days1977: 365 of 365 days1978: 365 of 365 days1979: 365 of 365 days1980: 299 of 366 days1981: 365 of 365 days1982: 364 of 365 days1983: 362 of 365 days1984: 363 of 366 days1985: 365 of 365 days1986: 148 of 365 days1987: 199 of 365 days1988: 366 of 366 days1989: 365 of 365 days1990: 363 of 365 days1991: 364 of 365 days1992: 364 of 366 days1993: 365 of 365 days1994: 365 of 365 days1995: 364 of 365 days1996: 366 of 366 days1997: 365 of 365 days1998: 364 of 365 days1999: 365 of 365 days2000: 366 of 366 days2001: 365 of 365 days2002: 365 of 365 days2003: 333 of 365 days2004: 335 of 366 days2005: 365 of 365 days2006: 365 of 365 days2007: 365 of 365 days2008: 366 of 366 days2009: 365 of 365 days2010: 364 of 365 days2011: 365 of 365 days2012: 305 of 366 days19751980198519901995200020052010
38 years of record at San Juan Tlacotenco, 1975 to 2012. 5 years have data for under 90 percent of days and are left out of rankings: 1975, 1980, 1986, 1987, 2012.
Days with data per year at San Juan Tlacotenco
YearDays with dataShare of yearComplete
197514339%No
1976365100%Yes
1977365100%Yes
1978365100%Yes
1979365100%Yes
198029982%No
1981365100%Yes
1982364100%Yes
198336299%Yes
198436399%Yes
1985365100%Yes
198614841%No
198719955%No
1988366100%Yes
1989365100%Yes
199036399%Yes
1991364100%Yes
199236499%Yes
1993365100%Yes
1994365100%Yes
1995364100%Yes
1996366100%Yes
1997365100%Yes
1998364100%Yes
1999365100%Yes
2000366100%Yes
2001365100%Yes
2002365100%Yes
200333391%Yes
200433592%Yes
2005365100%Yes
2006365100%Yes
2007365100%Yes
2008366100%Yes
2009365100%Yes
2010364100%Yes
2011365100%Yes
201230583%No

Latest Records

20
Latest records at San Juan Tlacotenco
DateStationRecordValueBeat old record byOld record stoodSignificance
30 October 2012San Juan Tlacotenco, MXdaily low max13.9 C (57.0 F)1.1 C (2.0 F)33 years17 of 100 (Routine)
29 October 2012San Juan Tlacotenco, MXdaily low max (Tie)15.0 C (59.0 F)tie22 years2 of 100 (Routine)
28 October 2012San Juan Tlacotenco, MXdaily rain38.9 mm (1.5 in)16.0 mm (0.6 in)34 years23 of 100 (Routine)
16 October 2012San Juan Tlacotenco, MXdaily low min (Tie)7.8 C (46.0 F)tie34 years3 of 100 (Routine)
7 October 2012San Juan Tlacotenco, MXdaily low min (Tie)10.0 C (50.0 F)tie37 years3 of 100 (Routine)
6 October 2012San Juan Tlacotenco, MXdaily low min (Tie)10.0 C (50.0 F)tie37 years3 of 100 (Routine)
5 October 2012San Juan Tlacotenco, MXdaily low min (Tie)8.9 C (48.0 F)tie2 years0 of 100 (Routine)
2 October 2012San Juan Tlacotenco, MXdaily low min (Tie)10.0 C (50.0 F)tie35 years3 of 100 (Routine)
1 October 2012San Juan Tlacotenco, MXdaily low max15.6 C (60.1 F)1.1 C (2.0 F)27 years16 of 100 (Routine)
21 September 2012San Juan Tlacotenco, MXdaily low max (Tie)15.6 C (60.1 F)tie23 years2 of 100 (Routine)
15 September 2012San Juan Tlacotenco, MXdaily rain61.0 mm (2.4 in)21.6 mm (0.9 in)37 years28 of 100 (Routine)
13 September 2012San Juan Tlacotenco, MXdaily low min (Tie)10.0 C (50.0 F)tie36 years3 of 100 (Routine)
4 September 2012San Juan Tlacotenco, MXdaily low min (Tie)10.0 C (50.0 F)tie36 years3 of 100 (Routine)
1 September 2012San Juan Tlacotenco, MXdaily low max15.6 C (60.1 F)1.1 C (2.0 F)37 years20 of 100 (Routine)
30 August 2012San Juan Tlacotenco, MXdaily low max (Tie)16.7 C (62.1 F)tie37 years3 of 100 (Routine)
27 August 2012San Juan Tlacotenco, MXdaily low max (Tie)16.7 C (62.1 F)tie31 years3 of 100 (Routine)
26 August 2012San Juan Tlacotenco, MXdaily low min (Tie)10.0 C (50.0 F)tie36 years3 of 100 (Routine)
25 August 2012San Juan Tlacotenco, MXdaily rain95.0 mm (3.7 in)32.5 mm (1.3 in)16 years25 of 100 (Routine)
25 August 2012San Juan Tlacotenco, MXdaily low max (Tie)15.6 C (60.1 F)tie27 years2 of 100 (Routine)
23 August 2012San Juan Tlacotenco, MXdaily low max15.6 C (60.1 F)2.2 C (4.0 F)28 years22 of 100 (Routine)

Climate Trend

31 complete years, 1976 to 2011
Annual mean temperature at San Juan Tlacotenco as warming stripes, 1976 to 2011 One stripe for each of 31 complete years at San Juan Tlacotenco, 1976 to 2011. Blue stripes are years cooler than the station's own mean of 15.6 C (60.0 F); red stripes are warmer. The coolest year was 2010, at 14.9 C (58.9 F), and the warmest was 1998, at 16.6 C (61.8 F). The strongest colour marks a difference of 1.1 C (2.0 F). 1976: 15.1 C, -0.5 C from the station mean1977: 15.4 C, -0.2 C from the station mean1978: 15.3 C, -0.3 C from the station mean1979: 15.8 C, +0.3 C from the station mean1981: 15.2 C, -0.4 C from the station mean1982: 16.0 C, +0.4 C from the station mean1983: 15.7 C, +0.2 C from the station mean1984: 15.2 C, -0.3 C from the station mean1985: 15.2 C, -0.3 C from the station mean1988: 16.0 C, +0.4 C from the station mean1989: 15.1 C, -0.4 C from the station mean1990: 15.0 C, -0.5 C from the station mean1991: 15.7 C, +0.2 C from the station mean1992: 15.0 C, -0.6 C from the station mean1993: 15.8 C, +0.2 C from the station mean1994: 15.9 C, +0.4 C from the station mean1995: 16.1 C, +0.6 C from the station mean1996: 15.7 C, +0.1 C from the station mean1997: 15.7 C, +0.2 C from the station mean1998: 16.6 C, +1.0 C from the station mean1999: 15.7 C, +0.1 C from the station mean2000: 15.9 C, +0.3 C from the station mean2001: 15.8 C, +0.2 C from the station mean2002: 16.1 C, +0.6 C from the station mean2005: 15.8 C, +0.2 C from the station mean2006: 15.4 C, -0.2 C from the station mean2007: 15.4 C, -0.1 C from the station mean2008: 15.1 C, -0.5 C from the station mean2009: 15.4 C, -0.2 C from the station mean2010: 14.9 C, -0.6 C from the station mean2011: 15.3 C, -0.2 C from the station mean19761980198519901995200020052010
One stripe for each of 31 complete years at San Juan Tlacotenco, 1976 to 2011. Blue stripes are years cooler than the station's own mean of 15.6 C (60.0 F); red stripes are warmer. The coolest year was 2010, at 14.9 C (58.9 F), and the warmest was 1998, at 16.6 C (61.8 F). The strongest colour marks a difference of 1.1 C (2.0 F).
Annual mean temperature at San Juan Tlacotenco as warming stripes, 1976 to 2011
YearAnnual mean temperatureDifference from the station mean
197615.1 C-0.45 C
197715.4 C-0.18 C
197815.3 C-0.29 C
197915.8 C+0.29 C
198115.2 C-0.40 C
198216.0 C+0.41 C
198315.7 C+0.18 C
198415.2 C-0.34 C
198515.2 C-0.33 C
198816.0 C+0.41 C
198915.1 C-0.41 C
199015.0 C-0.53 C
199115.7 C+0.17 C
199215.0 C-0.55 C
199315.8 C+0.20 C
199415.9 C+0.37 C
199516.1 C+0.57 C
199615.7 C+0.15 C
199715.7 C+0.18 C
199816.6 C+1.02 C
199915.7 C+0.12 C
200015.9 C+0.34 C
200115.8 C+0.20 C
200216.1 C+0.59 C
200515.8 C+0.25 C
200615.4 C-0.18 C
200715.4 C-0.13 C
200815.1 C-0.50 C
200915.4 C-0.18 C
201014.9 C-0.63 C
201115.3 C-0.24 C

The fitted trend in annual mean temperature here over 1976 to 2011 is 0.02 C (-0.12 to 0.17) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.04 F (-0.22 to 0.30) 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 Juan Tlacotenco
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.02 C (-0.12 to 0.17) per decade0.04 F (-0.22 to 0.30) per decade1976 to 201131Not clearly different from zero
Mean daily maximum-0.05 C (-0.28 to 0.19) per decade-0.1 F (-0.5 to 0.3) per decade1976 to 201131Not clearly different from zero
Mean daily minimum0.09 C (0.00 to 0.19) per decade0.17 F (-0.01 to 0.34) per decade1976 to 201131Not 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

1975 to 2012
Yearly extremes at San Juan Tlacotenco: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)32.8 C (91.0 F)199828.9 C (84.0 F)38
Coldest night (TNn)-3.3 C (26.1 F)20043.9 C (39.0 F)38
Wettest day (Rx1day)218.2 mm (8.6 in)201180.9 mm (3.2 in)38
Wettest five days (Rx5day)331.3 mm (13.0 in)2011160.1 mm (6.3 in)38
Longest dry spell (CDD)135 days199862 days38

Hottest day (TXx)

Hottest day (TXx) at San Juan Tlacotenco by year The hottest day of the year at San Juan Tlacotenco, 1975 to 2012. The record is 32.8 C (91.0 F) in 1998, marked on the chart; the median year is 28.9 C (84.0 F). 2426283032341980199020002010Record: 32.8 C (91.0 F) in 1998
The hottest day of the year at San Juan Tlacotenco, 1975 to 2012. The record is 32.8 C (91.0 F) in 1998, marked on the chart; the median year is 28.9 C (84.0 F).
Hottest day (TXx) at San Juan Tlacotenco by year
YearHottest day (TXx)
197525.0 C (77.0 F)
197627.8 C (82.0 F)
197728.9 C (84.0 F)
197830.0 C (86.0 F)
197927.8 C (82.0 F)
198028.9 C (84.0 F)
198127.8 C (82.0 F)
198228.9 C (84.0 F)
198330.0 C (86.0 F)
198430.0 C (86.0 F)
198527.8 C (82.0 F)
198630.0 C (86.0 F)
198725.0 C (77.0 F)
198830.0 C (86.0 F)
198928.9 C (84.0 F)
199026.7 C (80.1 F)
199130.0 C (86.0 F)
199226.7 C (80.1 F)
199330.0 C (86.0 F)
199430.0 C (86.0 F)
199530.0 C (86.0 F)
199628.9 C (84.0 F)
199728.9 C (84.0 F)
199832.8 C (91.0 F)
199930.0 C (86.0 F)
200028.9 C (84.0 F)
200130.0 C (86.0 F)
200230.0 C (86.0 F)
200330.0 C (86.0 F)
200427.8 C (82.0 F)
200528.9 C (84.0 F)
200627.8 C (82.0 F)
200727.8 C (82.0 F)
200827.8 C (82.0 F)
200927.8 C (82.0 F)
201028.9 C (84.0 F)
201126.7 C (80.1 F)
201226.7 C (80.1 F)

Coldest night (TNn)

Coldest night (TNn) at San Juan Tlacotenco by year The coldest night of the year at San Juan Tlacotenco, 1975 to 2012. The record is -3.3 C (26.1 F) in 2004, marked on the chart; the median year is 3.9 C (39.0 F). -5-2.502.557.51980199020002010Record: -3.3 C (26.1 F) in 2004
The coldest night of the year at San Juan Tlacotenco, 1975 to 2012. The record is -3.3 C (26.1 F) in 2004, marked on the chart; the median year is 3.9 C (39.0 F).
Coldest night (TNn) at San Juan Tlacotenco by year
YearColdest night (TNn)
19752.8 C (37.0 F)
19763.9 C (39.0 F)
19771.7 C (35.1 F)
19783.9 C (39.0 F)
19795.0 C (41.0 F)
19803.9 C (39.0 F)
19810.0 C (32.0 F)
19823.9 C (39.0 F)
19832.8 C (37.0 F)
19843.9 C (39.0 F)
19855.6 C (42.1 F)
19862.8 C (37.0 F)
19875.6 C (42.1 F)
19880.6 C (33.1 F)
19890.0 C (32.0 F)
19902.8 C (37.0 F)
19915.0 C (41.0 F)
19922.8 C (37.0 F)
19935.0 C (41.0 F)
19943.9 C (39.0 F)
19955.0 C (41.0 F)
19963.9 C (39.0 F)
19972.8 C (37.0 F)
19983.9 C (39.0 F)
19992.8 C (37.0 F)
20002.8 C (37.0 F)
20015.0 C (41.0 F)
20025.0 C (41.0 F)
20035.0 C (41.0 F)
2004-3.3 C (26.1 F)
20055.0 C (41.0 F)
20061.7 C (35.1 F)
20072.8 C (37.0 F)
20082.8 C (37.0 F)
20090.0 C (32.0 F)
20101.7 C (35.1 F)
20115.0 C (41.0 F)
20125.0 C (41.0 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at San Juan Tlacotenco by year The wettest day of the year at San Juan Tlacotenco, 1975 to 2012. The record is 218.2 mm (8.6 in) in 2011, marked on the chart; the median year is 80.9 mm (3.2 in). 501001502002501980199020002010Record: 218.2 mm (8.6 in) in 2011
The wettest day of the year at San Juan Tlacotenco, 1975 to 2012. The record is 218.2 mm (8.6 in) in 2011, marked on the chart; the median year is 80.9 mm (3.2 in).
Wettest day (Rx1day) at San Juan Tlacotenco by year
YearWettest day (Rx1day)
197580.8 mm (3.2 in)
1976147.3 mm (5.8 in)
197761.0 mm (2.4 in)
1978117.9 mm (4.6 in)
197981.0 mm (3.2 in)
198084.8 mm (3.3 in)
198175.9 mm (3.0 in)
198291.2 mm (3.6 in)
198373.9 mm (2.9 in)
198459.4 mm (2.3 in)
198568.6 mm (2.7 in)
198683.3 mm (3.3 in)
198772.6 mm (2.9 in)
1988107.2 mm (4.2 in)
198982.8 mm (3.3 in)
199070.4 mm (2.8 in)
199181.8 mm (3.2 in)
199286.9 mm (3.4 in)
199398.3 mm (3.9 in)
199474.7 mm (2.9 in)
199568.6 mm (2.7 in)
199684.3 mm (3.3 in)
199751.3 mm (2.0 in)
1998101.9 mm (4.0 in)
199975.9 mm (3.0 in)
200084.8 mm (3.3 in)
200157.4 mm (2.3 in)
200263.8 mm (2.5 in)
200379.0 mm (3.1 in)
200474.9 mm (2.9 in)
200579.8 mm (3.1 in)
200655.4 mm (2.2 in)
200769.9 mm (2.8 in)
200898.8 mm (3.9 in)
200998.8 mm (3.9 in)
2010160.5 mm (6.3 in)
2011218.2 mm (8.6 in)
201295.0 mm (3.7 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at San Juan Tlacotenco by year The wettest five days of the year at San Juan Tlacotenco, 1975 to 2012. The record is 331.3 mm (13.0 in) in 2011, marked on the chart; the median year is 160.1 mm (6.3 in). 01002003004001980199020002010Record: 331.3 mm (13.0 in) in 2011
The wettest five days of the year at San Juan Tlacotenco, 1975 to 2012. The record is 331.3 mm (13.0 in) in 2011, marked on the chart; the median year is 160.1 mm (6.3 in).
Wettest five days (Rx5day) at San Juan Tlacotenco by year
YearWettest five days (Rx5day)
1975230.4 mm (9.1 in)
1976288.5 mm (11.4 in)
1977127.2 mm (5.0 in)
1978187.2 mm (7.4 in)
1979182.6 mm (7.2 in)
1980153.9 mm (6.1 in)
1981205.6 mm (8.1 in)
1982118.7 mm (4.7 in)
1983155.1 mm (6.1 in)
1984166.9 mm (6.6 in)
1985160.8 mm (6.3 in)
1986130.6 mm (5.1 in)
1987208.2 mm (8.2 in)
1988204.7 mm (8.1 in)
1989121.2 mm (4.8 in)
1990168.7 mm (6.6 in)
1991151.4 mm (6.0 in)
1992137.4 mm (5.4 in)
1993199.4 mm (7.9 in)
1994130.0 mm (5.1 in)
1995144.6 mm (5.7 in)
1996158.1 mm (6.2 in)
1997131.7 mm (5.2 in)
1998190.6 mm (7.5 in)
1999157.0 mm (6.2 in)
2000151.3 mm (6.0 in)
2001173.1 mm (6.8 in)
2002214.3 mm (8.4 in)
2003181.8 mm (7.2 in)
2004130.0 mm (5.1 in)
2005159.4 mm (6.3 in)
200693.2 mm (3.7 in)
2007140.2 mm (5.5 in)
2008235.0 mm (9.3 in)
2009156.4 mm (6.2 in)
2010206.9 mm (8.1 in)
2011331.3 mm (13.0 in)
2012232.4 mm (9.1 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at San Juan Tlacotenco by year The longest dry spell of the year at San Juan Tlacotenco, 1975 to 2012. The record is 135 days in 1998, marked on the chart; the median year is 62 days. 0501001501980199020002010Record: 135 days in 1998
The longest dry spell of the year at San Juan Tlacotenco, 1975 to 2012. The record is 135 days in 1998, marked on the chart; the median year is 62 days.
Longest dry spell (CDD) at San Juan Tlacotenco by year
YearLongest dry spell (CDD)
197544 days
197656 days
197749 days
197852 days
197950 days
198067 days
198163 days
198252 days
198368 days
198458 days
198534 days
198677 days
1987115 days
198880 days
198995 days
199041 days
1991120 days
199233 days
199373 days
199471 days
199558 days
199659 days
199739 days
1998135 days
199978 days
2000103 days
200165 days
200246 days
200388 days
200461 days
2005105 days
200659 days
200742 days
2008107 days
200966 days
201059 days
201164 days
201260 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

34 years, 1976 to 2011

A day with at least 78.0 mm (3.1 in) of rain is expected about once in 2 years. A day with at least 227.1 mm (8.9 in) of rain is expected about once in 100 years.

Rainfall return levels at San Juan Tlacotenco: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years78.0 mm (3.1 in)
5 years101.4 mm (4.0 in)
10 years122.0 mm (4.8 in)
25 years155.7 mm (6.1 in)
50 years187.7 mm (7.4 in)Longer than the 34 years of record
100 years227.1 mm (8.9 in)Longer than the 34 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, 34 years of values from 1976 to 2011.

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: 218.2 mm (8.6 in) in 2011; 160.5 mm (6.3 in) in 2010; 147.3 mm (5.8 in) in 1976.

Download the Data

  • Data for San Juan Tlacotenco standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for San Juan Tlacotenco 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

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