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San Juan Atepec Weather Records (MXN00020004)

Record envelope, standing records and threshold days for San Juan Atepec (MXN00020004), Mexico, with 56 years of record.

Key Facts for San Juan Atepec

  • San Juan Atepec (MXN00020004) is a weather station in Mexico at 17.42 latitude and -96.53 longitude, 1,975 m (6,479 ft) above sea level.
  • The station reports from 1955 to 2010, 56 years of record.
  • 1,464 records set at San Juan Atepec still stand.
  • Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
  • San Juan Atepec set a daily record low minimum temperature of 3.9 C (39.0 F) on 28 December 2010.

About the Station

  • Location: Mexico, 17.42 latitude, -96.53 longitude.
  • Elevation: 1,975 m (6,479 ft).
  • Period of record: 1955 to 2010, 56 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 Atepec, with 2026 drawn through them The band shows the record high and record low for each calendar day at San Juan Atepec. The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. 010203040 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at San Juan Atepec. 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 Atepec, 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
Feb35.6 C (96.1 F)0.0 C (32.0 F)n/an/a
Mar38.9 C (102.0 F)0.0 C (32.0 F)n/an/a
Apr38.9 C (102.0 F)0.0 C (32.0 F)n/an/a
May38.9 C (102.0 F)5.0 C (41.0 F)n/an/a
Jun36.7 C (98.1 F)5.0 C (41.0 F)n/an/a
Jul30.6 C (87.1 F)7.8 C (46.0 F)n/an/a
Aug30.0 C (86.0 F)6.7 C (44.1 F)n/an/a
Sep30.6 C (87.1 F)6.7 C (44.1 F)n/an/a
Oct31.7 C (89.1 F)0.0 C (32.0 F)n/an/a
Nov35.6 C (96.1 F)0.6 C (33.1 F)n/an/a
Dec33.9 C (93.0 F)0.6 C (33.1 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at San Juan Atepec by the year they were set 1,464 records at San Juan Atepec still stand. 2000 holds the most, with 71. 0204060801955: 271956: 461957: 341958: 311959: 201960: 331961: 241962: 231963: 191964: 311965: 231966: 361967: 341968: 381969: 451970: 221971: 251972: 301973: 301974: 291975: 281976: 281977: 461978: 281979: 451980: 421981: 141982: 271983: 601984: 351991: 431992: 221993: 111997: 82000: 712001: 462002: 402003: 422004: 462005: 362006: 252007: 182008: 172009: 332010: 53195519601965197019751980199120012006
1,464 records at San Juan Atepec still stand. 2000 holds the most, with 71.
Standing records at San Juan Atepec by the year they were set
Year setStanding records
195527
195646
195734
195831
195920
196033
196124
196223
196319
196431
196523
196636
196734
196838
196945
197022
197125
197230
197330
197429
197528
197628
197746
197828
197945
198042
198114
198227
198360
198435
199143
199222
199311
19978
200071
200146
200240
200342
200446
200536
200625
200718
200817
200933
201053

All-Time Record Progression

2 new records
When San Juan Atepec set new all-time records 2 all-time records were set at San Juan Atepec between 14 September 2003 and 4 October 2005. Each dot is a new record. Record daily precipitation14 September 2003: Record daily precipitation 106.9 mm (4.2 in)4 October 2005: Record daily precipitation 285.0 mm (11.2 in)2005
2 all-time records were set at San Juan Atepec between 14 September 2003 and 4 October 2005. Each dot is a new record.
When San Juan Atepec set new all-time records
DateKindDetail
2003-09-14Record daily precipitationRecord daily precipitation 106.9 mm (4.2 in)
2005-10-04Record daily precipitationRecord daily precipitation 285.0 mm (11.2 in)

Wettest Day of Each Month

Oct: 285.0 mm (11.2 in)
Record daily precipitation for each month at San Juan Atepec The wettest day on record for each calendar month at San Juan Atepec. The most was 285.0 mm (11.2 in) on 4 October 2005. 0100200300 Jan: 22.9 mm (0.9 in), 1 January 2008 Jan Feb: 20.6 mm (0.8 in), 26 February 1982 Feb Mar: 32.0 mm (1.3 in), 26 March 2009 Mar Apr: 63.0 mm (2.5 in), 18 April 1967 Apr May: 63.8 mm (2.5 in), 16 May 1957 May Jun: 73.9 mm (2.9 in), 18 June 1967 Jun Jul: 80.3 mm (3.2 in), 25 July 1973 Jul Aug: 102.9 mm (4.1 in), 22 August 2010 Aug Sep: 169.9 mm (6.7 in), 27 September 2010 Sep Oct: 285.0 mm (11.2 in), 4 October 2005 Oct Nov: 30.0 mm (1.2 in), 6 November 1971 Nov Dec: 30.7 mm (1.2 in), 24 December 1971 Dec
The wettest day on record for each calendar month at San Juan Atepec. The most was 285.0 mm (11.2 in) on 4 October 2005.
Record daily precipitation for each month at San Juan Atepec
MonthRecord daily precipitation (mm)Date
Jan22.9 mm (0.9 in)1 January 2008
Feb20.6 mm (0.8 in)26 February 1982
Mar32.0 mm (1.3 in)26 March 2009
Apr63.0 mm (2.5 in)18 April 1967
May63.8 mm (2.5 in)16 May 1957
Jun73.9 mm (2.9 in)18 June 1967
Jul80.3 mm (3.2 in)25 July 1973
Aug102.9 mm (4.1 in)22 August 2010
Sep169.9 mm (6.7 in)27 September 2010
Oct285.0 mm (11.2 in)4 October 2005
Nov30.0 mm (1.2 in)6 November 1971
Dec30.7 mm (1.2 in)24 December 1971

Period of Record Coverage

1955 to 2010
Days with data per year at San Juan Atepec 45 years of record at San Juan Atepec, 1955 to 2010. 3 years have data for under 90 percent of days and are left out of rankings: 1955, 1997, 2000. 1955: 247 of 365 days1956: 366 of 366 days1957: 361 of 365 days1958: 365 of 365 days1959: 364 of 365 days1960: 365 of 366 days1961: 364 of 365 days1962: 364 of 365 days1963: 365 of 365 days1964: 366 of 366 days1965: 332 of 365 days1966: 363 of 365 days1967: 361 of 365 days1968: 365 of 366 days1969: 363 of 365 days1970: 363 of 365 days1971: 364 of 365 days1972: 363 of 366 days1973: 364 of 365 days1974: 364 of 365 days1975: 363 of 365 days1976: 366 of 366 days1977: 364 of 365 days1978: 364 of 365 days1979: 364 of 365 days1980: 366 of 366 days1981: 360 of 365 days1982: 364 of 365 days1983: 365 of 365 days1984: 332 of 366 days1991: 363 of 365 days1992: 366 of 366 days1993: 365 of 365 days1997: 212 of 365 days2000: 274 of 366 days2001: 333 of 365 days2002: 334 of 365 days2003: 364 of 365 days2004: 366 of 366 days2005: 365 of 365 days2006: 363 of 365 days2007: 365 of 365 days2008: 366 of 366 days2009: 365 of 365 days2010: 365 of 365 days19601970198020002010
45 years of record at San Juan Atepec, 1955 to 2010. 3 years have data for under 90 percent of days and are left out of rankings: 1955, 1997, 2000.
Days with data per year at San Juan Atepec
YearDays with dataShare of yearComplete
195524768%No
1956366100%Yes
195736199%Yes
1958365100%Yes
1959364100%Yes
1960365100%Yes
1961364100%Yes
1962364100%Yes
1963365100%Yes
1964366100%Yes
196533291%Yes
196636399%Yes
196736199%Yes
1968365100%Yes
196936399%Yes
197036399%Yes
1971364100%Yes
197236399%Yes
1973364100%Yes
1974364100%Yes
197536399%Yes
1976366100%Yes
1977364100%Yes
1978364100%Yes
1979364100%Yes
1980366100%Yes
198136099%Yes
1982364100%Yes
1983365100%Yes
198433291%Yes
199136399%Yes
1992366100%Yes
1993365100%Yes
199721258%No
200027475%No
200133391%Yes
200233492%Yes
2003364100%Yes
2004366100%Yes
2005365100%Yes
200636399%Yes
2007365100%Yes
2008366100%Yes
2009365100%Yes
2010365100%Yes

Latest Records

20
Latest records at San Juan Atepec
DateStationRecordValueBeat old record byOld record stoodSignificance
28 December 2010San Juan Atepec, MXdaily low min3.9 C (39.0 F)1.1 C (2.0 F)55 years26 of 100 (Routine)
27 December 2010San Juan Atepec, MXdaily low min2.8 C (37.0 F)1.1 C (2.0 F)55 years26 of 100 (Routine)
26 December 2010San Juan Atepec, MXdaily low max11.7 C (53.1 F)1.6 C (2.9 F)44 years21 of 100 (Routine)
16 December 2010San Juan Atepec, MXdaily low min (Tie)5.0 C (41.0 F)tie37 years4 of 100 (Routine)
15 December 2010San Juan Atepec, MXdaily low min3.9 C (39.0 F)1.1 C (2.0 F)1 year10 of 100 (Routine)
14 December 2010San Juan Atepec, MXdaily low min (Tie)3.9 C (39.0 F)tie39 years4 of 100 (Routine)
11 December 2010San Juan Atepec, MXdaily low min1.7 C (35.1 F)3.3 C (5.9 F)52 years36 of 100 (Notable)
10 December 2010San Juan Atepec, MXmonthly low min0.6 C (33.1 F)1.6 C (2.9 F)29 years30 of 100 (Routine)
9 December 2010San Juan Atepec, MXdaily low min2.8 C (37.0 F)2.2 C (4.0 F)52 years30 of 100 (Routine)
7 December 2010San Juan Atepec, MXdaily low min5.6 C (42.1 F)1.1 C (2.0 F)1 year10 of 100 (Routine)
6 December 2010San Juan Atepec, MXdaily low min5.0 C (41.0 F)0.6 C (1.1 F)48 years21 of 100 (Routine)
5 December 2010San Juan Atepec, MXdaily low min3.9 C (39.0 F)1.7 C (3.1 F)48 years27 of 100 (Routine)
16 November 2010San Juan Atepec, MXdaily high max (Tie)28.9 C (84.0 F)tie0 years1 of 100 (Routine)
10 November 2010San Juan Atepec, MXdaily low min (Tie)5.6 C (42.1 F)tie19 years2 of 100 (Routine)
9 November 2010San Juan Atepec, MXdaily low min (Tie)5.0 C (41.0 F)tie28 years3 of 100 (Routine)
8 November 2010San Juan Atepec, MXdaily low min5.0 C (41.0 F)0.6 C (1.1 F)33 years17 of 100 (Routine)
6 November 2010San Juan Atepec, MXdaily low min2.8 C (37.0 F)1.1 C (2.0 F)44 years22 of 100 (Routine)
28 October 2010San Juan Atepec, MXdaily rain37.8 mm (1.5 in)30.9 mm (1.2 in)52 years37 of 100 (Notable)
27 October 2010San Juan Atepec, MXdaily high max (Tie)30.6 C (87.1 F)tie33 years3 of 100 (Routine)
26 October 2010San Juan Atepec, MXdaily high max (Tie)30.0 C (86.0 F)tie8 years1 of 100 (Routine)

Climate Trend

38 complete years, 1956 to 2010
Annual mean temperature at San Juan Atepec as warming stripes, 1956 to 2010 One stripe for each of 38 complete years at San Juan Atepec, 1956 to 2010. Blue stripes are years cooler than the station's own mean of 18.0 C (64.5 F); red stripes are warmer. The coolest year was 1960, at 16.4 C (61.5 F), and the warmest was 2005, at 19.7 C (67.5 F). The strongest colour marks a difference of 1.7 C (3.1 F). 1956: 16.9 C, -1.2 C from the station mean1957: 17.9 C, -0.2 C from the station mean1958: 17.8 C, -0.2 C from the station mean1959: 17.5 C, -0.6 C from the station mean1960: 16.4 C, -1.7 C from the station mean1961: 17.2 C, -0.8 C from the station mean1962: 17.5 C, -0.6 C from the station mean1963: 17.1 C, -1.0 C from the station mean1964: 17.4 C, -0.7 C from the station mean1966: 16.7 C, -1.3 C from the station mean1967: 16.6 C, -1.4 C from the station mean1968: 16.5 C, -1.6 C from the station mean1969: 17.7 C, -0.4 C from the station mean1970: 17.2 C, -0.9 C from the station mean1971: 16.9 C, -1.1 C from the station mean1972: 17.2 C, -0.8 C from the station mean1973: 17.8 C, -0.2 C from the station mean1974: 17.2 C, -0.9 C from the station mean1975: 18.2 C, +0.1 C from the station mean1976: 18.2 C, +0.2 C from the station mean1977: 19.1 C, +1.0 C from the station mean1978: 18.8 C, +0.8 C from the station mean1979: 18.5 C, +0.5 C from the station mean1980: 19.0 C, +1.0 C from the station mean1981: 18.5 C, +0.4 C from the station mean1982: 19.2 C, +1.1 C from the station mean1983: 19.6 C, +1.6 C from the station mean1991: 19.1 C, +1.1 C from the station mean1992: 18.5 C, +0.5 C from the station mean1993: 18.6 C, +0.5 C from the station mean2003: 19.5 C, +1.4 C from the station mean2004: 19.4 C, +1.4 C from the station mean2005: 19.7 C, +1.7 C from the station mean2006: 18.9 C, +0.8 C from the station mean2007: 18.8 C, +0.8 C from the station mean2008: 17.9 C, -0.1 C from the station mean2009: 18.6 C, +0.5 C from the station mean2010: 18.2 C, +0.2 C from the station mean195619601965197019751980198519901995200020052010
One stripe for each of 38 complete years at San Juan Atepec, 1956 to 2010. Blue stripes are years cooler than the station's own mean of 18.0 C (64.5 F); red stripes are warmer. The coolest year was 1960, at 16.4 C (61.5 F), and the warmest was 2005, at 19.7 C (67.5 F). The strongest colour marks a difference of 1.7 C (3.1 F).
Annual mean temperature at San Juan Atepec as warming stripes, 1956 to 2010
YearAnnual mean temperatureDifference from the station mean
195616.9 C-1.17 C
195717.9 C-0.15 C
195817.8 C-0.22 C
195917.5 C-0.58 C
196016.4 C-1.66 C
196117.2 C-0.81 C
196217.5 C-0.59 C
196317.1 C-0.95 C
196417.4 C-0.67 C
196616.7 C-1.33 C
196716.6 C-1.41 C
196816.5 C-1.58 C
196917.7 C-0.38 C
197017.2 C-0.89 C
197116.9 C-1.12 C
197217.2 C-0.82 C
197317.8 C-0.24 C
197417.2 C-0.89 C
197518.2 C+0.15 C
197618.2 C+0.18 C
197719.1 C+1.02 C
197818.8 C+0.79 C
197918.5 C+0.47 C
198019.0 C+0.97 C
198118.5 C+0.41 C
198219.2 C+1.12 C
198319.6 C+1.60 C
199119.1 C+1.09 C
199218.5 C+0.47 C
199318.6 C+0.52 C
200319.5 C+1.44 C
200419.4 C+1.38 C
200519.7 C+1.69 C
200618.9 C+0.84 C
200718.8 C+0.78 C
200817.9 C-0.12 C
200918.6 C+0.52 C
201018.2 C+0.16 C

The annual mean temperature here has risen by 0.4 C (0.3 to 0.5) per decade over 1956 to 2010. In Fahrenheit: 0.7 F (0.5 to 0.9) per decade. The slope is a straight line fitted to 38 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at San Juan Atepec
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature0.4 C (0.3 to 0.5) per decade0.7 F (0.5 to 0.9) per decade1956 to 201038Rise
Mean daily maximum0.7 C (0.5 to 0.9) per decade1.3 F (0.8 to 1.7) per decade1956 to 201038Rise
Mean daily minimum0.08 C (-0.02 to 0.17) per decade0.14 F (-0.03 to 0.31) per decade1956 to 201038Not 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

1955 to 2010
Yearly extremes at San Juan Atepec: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)38.9 C (102.0 F)197835.6 C (96.1 F)45
Coldest night (TNn)0.0 C (32.0 F)19562.8 C (37.0 F)45
Wettest day (Rx1day)285.0 mm (11.2 in)200550.3 mm (2.0 in)45
Wettest five days (Rx5day)347.0 mm (13.7 in)2010111.6 mm (4.4 in)45
Longest dry spell (CDD)132 days200278 days45

Hottest day (TXx)

Hottest day (TXx) at San Juan Atepec by year The hottest day of the year at San Juan Atepec, 1955 to 2010. The record is 38.9 C (102.0 F) in 1978, marked on the chart; the median year is 35.6 C (96.1 F). 3032.53537.540196019701980199020002010Record: 38.9 C (102.0 F) in 1978
The hottest day of the year at San Juan Atepec, 1955 to 2010. The record is 38.9 C (102.0 F) in 1978, marked on the chart; the median year is 35.6 C (96.1 F).
Hottest day (TXx) at San Juan Atepec by year
YearHottest day (TXx)
195531.7 C (89.1 F)
195631.7 C (89.1 F)
195733.3 C (91.9 F)
195834.4 C (93.9 F)
195935.6 C (96.1 F)
196030.6 C (87.1 F)
196133.3 C (91.9 F)
196233.9 C (93.0 F)
196331.7 C (89.1 F)
196436.1 C (97.0 F)
196530.6 C (87.1 F)
196631.7 C (89.1 F)
196731.7 C (89.1 F)
196830.6 C (87.1 F)
196935.6 C (96.1 F)
197033.9 C (93.0 F)
197135.0 C (95.0 F)
197233.9 C (93.0 F)
197335.6 C (96.1 F)
197433.9 C (93.0 F)
197536.7 C (98.1 F)
197635.6 C (96.1 F)
197737.8 C (100.0 F)
197838.9 C (102.0 F)
197936.7 C (98.1 F)
198037.8 C (100.0 F)
198135.6 C (96.1 F)
198236.7 C (98.1 F)
198338.9 C (102.0 F)
198438.9 C (102.0 F)
199138.9 C (102.0 F)
199237.8 C (100.0 F)
199333.9 C (93.0 F)
199737.8 C (100.0 F)
200035.6 C (96.1 F)
200136.7 C (98.1 F)
200235.6 C (96.1 F)
200337.8 C (100.0 F)
200435.6 C (96.1 F)
200536.7 C (98.1 F)
200635.0 C (95.0 F)
200735.0 C (95.0 F)
200836.7 C (98.1 F)
200937.8 C (100.0 F)
201037.8 C (100.0 F)

Coldest night (TNn)

Coldest night (TNn) at San Juan Atepec by year The coldest night of the year at San Juan Atepec, 1955 to 2010. The record is 0.0 C (32.0 F) in 1956, marked on the chart; the median year is 2.8 C (37.0 F). 0246196019701980199020002010Record: 0.0 C (32.0 F) in 1956
The coldest night of the year at San Juan Atepec, 1955 to 2010. The record is 0.0 C (32.0 F) in 1956, marked on the chart; the median year is 2.8 C (37.0 F).
Coldest night (TNn) at San Juan Atepec by year
YearColdest night (TNn)
19553.9 C (39.0 F)
19560.0 C (32.0 F)
19573.9 C (39.0 F)
19583.9 C (39.0 F)
19594.4 C (39.9 F)
19603.3 C (37.9 F)
19613.9 C (39.0 F)
19623.9 C (39.0 F)
19632.2 C (36.0 F)
19642.2 C (36.0 F)
19653.9 C (39.0 F)
19660.6 C (33.1 F)
19673.9 C (39.0 F)
19680.0 C (32.0 F)
19695.0 C (41.0 F)
19703.9 C (39.0 F)
19713.9 C (39.0 F)
19720.6 C (33.1 F)
19730.6 C (33.1 F)
19743.9 C (39.0 F)
19753.9 C (39.0 F)
19761.7 C (35.1 F)
19772.8 C (37.0 F)
19783.9 C (39.0 F)
19792.8 C (37.0 F)
19802.2 C (36.0 F)
19812.8 C (37.0 F)
19820.0 C (32.0 F)
19833.9 C (39.0 F)
19840.6 C (33.1 F)
19913.9 C (39.0 F)
19925.0 C (41.0 F)
19930.0 C (32.0 F)
19970.6 C (33.1 F)
20000.0 C (32.0 F)
20010.6 C (33.1 F)
20021.7 C (35.1 F)
20033.9 C (39.0 F)
20045.0 C (41.0 F)
20055.0 C (41.0 F)
20062.8 C (37.0 F)
20075.6 C (42.1 F)
20082.8 C (37.0 F)
20092.8 C (37.0 F)
20100.6 C (33.1 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at San Juan Atepec by year The wettest day of the year at San Juan Atepec, 1955 to 2010. The record is 285.0 mm (11.2 in) in 2005, marked on the chart; the median year is 50.3 mm (2.0 in). 0100200300196019701980199020002010Record: 285.0 mm (11.2 in) in 2005
The wettest day of the year at San Juan Atepec, 1955 to 2010. The record is 285.0 mm (11.2 in) in 2005, marked on the chart; the median year is 50.3 mm (2.0 in).
Wettest day (Rx1day) at San Juan Atepec by year
YearWettest day (Rx1day)
195547.8 mm (1.9 in)
195643.9 mm (1.7 in)
195763.8 mm (2.5 in)
195875.9 mm (3.0 in)
195946.0 mm (1.8 in)
196045.0 mm (1.8 in)
196160.5 mm (2.4 in)
196231.0 mm (1.2 in)
196352.3 mm (2.1 in)
196434.8 mm (1.4 in)
196539.9 mm (1.6 in)
196640.1 mm (1.6 in)
196773.9 mm (2.9 in)
196859.9 mm (2.4 in)
196970.6 mm (2.8 in)
197040.4 mm (1.6 in)
197140.6 mm (1.6 in)
197250.3 mm (2.0 in)
197380.3 mm (3.2 in)
197459.9 mm (2.4 in)
197550.0 mm (2.0 in)
197639.9 mm (1.6 in)
197750.0 mm (2.0 in)
197870.4 mm (2.8 in)
197960.5 mm (2.4 in)
198050.3 mm (2.0 in)
198159.9 mm (2.4 in)
198240.4 mm (1.6 in)
198369.9 mm (2.8 in)
198440.4 mm (1.6 in)
199160.5 mm (2.4 in)
199280.0 mm (3.1 in)
199350.5 mm (2.0 in)
199740.1 mm (1.6 in)
200030.5 mm (1.2 in)
200171.9 mm (2.8 in)
200263.8 mm (2.5 in)
2003106.9 mm (4.2 in)
200433.8 mm (1.3 in)
2005285.0 mm (11.2 in)
200649.8 mm (2.0 in)
200742.9 mm (1.7 in)
200851.3 mm (2.0 in)
200943.4 mm (1.7 in)
2010169.9 mm (6.7 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at San Juan Atepec by year The wettest five days of the year at San Juan Atepec, 1955 to 2010. The record is 347.0 mm (13.7 in) in 2010, marked on the chart; the median year is 111.6 mm (4.4 in). 0100200300400196019701980199020002010Record: 347.0 mm (13.7 in) in 2010
The wettest five days of the year at San Juan Atepec, 1955 to 2010. The record is 347.0 mm (13.7 in) in 2010, marked on the chart; the median year is 111.6 mm (4.4 in).
Wettest five days (Rx5day) at San Juan Atepec by year
YearWettest five days (Rx5day)
1955120.2 mm (4.7 in)
1956111.6 mm (4.4 in)
1957106.3 mm (4.2 in)
1958118.3 mm (4.7 in)
1959104.4 mm (4.1 in)
196070.9 mm (2.8 in)
1961115.4 mm (4.5 in)
196298.0 mm (3.9 in)
1963105.9 mm (4.2 in)
196477.5 mm (3.1 in)
196574.0 mm (2.9 in)
196671.1 mm (2.8 in)
1967136.4 mm (5.4 in)
1968116.6 mm (4.6 in)
1969198.5 mm (7.8 in)
197091.8 mm (3.6 in)
197161.5 mm (2.4 in)
1972122.2 mm (4.8 in)
1973121.0 mm (4.8 in)
1974120.5 mm (4.7 in)
1975200.8 mm (7.9 in)
197670.7 mm (2.8 in)
1977110.3 mm (4.3 in)
1978170.7 mm (6.7 in)
1979111.6 mm (4.4 in)
1980161.6 mm (6.4 in)
1981150.5 mm (5.9 in)
198262.4 mm (2.5 in)
1983170.7 mm (6.7 in)
198490.2 mm (3.6 in)
1991111.3 mm (4.4 in)
1992131.1 mm (5.2 in)
1993130.4 mm (5.1 in)
199759.9 mm (2.4 in)
200091.0 mm (3.6 in)
2001125.3 mm (4.9 in)
200293.0 mm (3.7 in)
2003124.7 mm (4.9 in)
200479.6 mm (3.1 in)
2005328.4 mm (12.9 in)
200695.3 mm (3.8 in)
200785.6 mm (3.4 in)
2008147.8 mm (5.8 in)
200988.9 mm (3.5 in)
2010347.0 mm (13.7 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at San Juan Atepec by year The longest dry spell of the year at San Juan Atepec, 1955 to 2010. The record is 132 days in 2002, marked on the chart; the median year is 78 days. 050100150196019701980199020002010Record: 132 days in 2002
The longest dry spell of the year at San Juan Atepec, 1955 to 2010. The record is 132 days in 2002, marked on the chart; the median year is 78 days.
Longest dry spell (CDD) at San Juan Atepec by year
YearLongest dry spell (CDD)
195527 days
195637 days
195735 days
195835 days
195961 days
1960121 days
196162 days
196299 days
196380 days
1964131 days
196553 days
196663 days
196797 days
196898 days
196997 days
197093 days
197172 days
197293 days
1973106 days
197487 days
197578 days
1976101 days
1977129 days
197898 days
197969 days
198097 days
198143 days
198259 days
198395 days
198480 days
199150 days
199252 days
199339 days
199763 days
2000103 days
200193 days
2002132 days
200390 days
200443 days
200575 days
200655 days
200748 days
200894 days
200935 days
201052 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

41 years, 1956 to 2010

A day with at least 51.0 mm (2.0 in) of rain is expected about once in 2 years. A day with at least 238.8 mm (9.4 in) of rain is expected about once in 100 years.

Rainfall return levels at San Juan Atepec: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years51.0 mm (2.0 in)
5 years72.3 mm (2.8 in)
10 years93.9 mm (3.7 in)
25 years134.5 mm (5.3 in)
50 years178.4 mm (7.0 in)Longer than the 41 years of record
100 years238.8 mm (9.4 in)Longer than the 41 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, 41 years of values from 1956 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: 285.0 mm (11.2 in) in 2005; 169.9 mm (6.7 in) in 2010; 106.9 mm (4.2 in) in 2003.

Download the Data

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