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Atotonilco El Alto Weather Records (MXN00014017)

Record envelope, standing records and threshold days for Atotonilco El Alto (MXN00014017), Mexico, with 71 years of record.

Key Facts for Atotonilco El Alto

  • Atotonilco El Alto (MXN00014017) is a weather station in Mexico at 20.55 latitude and -102.50 longitude, 1,600 m (5,249 ft) above sea level.
  • The station reports from 1942 to 2012, 71 years of record.
  • 1,464 records set at Atotonilco El Alto still stand.
  • Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
  • Atotonilco El Alto tied a daily record high maximum temperature of 28.3 C (82.9 F) on 30 December 2011.

About the Station

  • Location: Mexico, 20.55 latitude, -102.50 longitude.
  • Elevation: 1,600 m (5,249 ft).
  • Period of record: 1942 to 2012, 71 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 Atotonilco El Alto, with 2026 drawn through them The band shows the record high and record low for each calendar day at Atotonilco El Alto. 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 Atotonilco El Alto. 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 Atotonilco El Alto, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan34.4 C (93.9 F)0.0 C (32.0 F)n/an/a
Feb33.9 C (93.0 F)-2.2 C (28.0 F)n/an/a
Mar38.9 C (102.0 F)1.7 C (35.1 F)n/an/a
Apr36.7 C (98.1 F)0.0 C (32.0 F)n/an/a
May39.4 C (102.9 F)4.4 C (39.9 F)n/an/a
Jun39.4 C (102.9 F)7.8 C (46.0 F)n/an/a
Jul39.4 C (102.9 F)8.9 C (48.0 F)n/an/a
Aug33.9 C (93.0 F)7.2 C (45.0 F)n/an/a
Sep35.0 C (95.0 F)3.9 C (39.0 F)n/an/a
Oct33.3 C (91.9 F)0.0 C (32.0 F)n/an/a
Nov32.8 C (91.0 F)0.0 C (32.0 F)n/an/a
Dec35.0 C (95.0 F)0.0 C (32.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Atotonilco El Alto by the year they were set 1,464 records at Atotonilco El Alto still stand. 1948 holds the most, with 95. 02550751001942: 171943: 441944: 461945: 651946: 511947: 481948: 951949: 301955: 71963: 221964: 121965: 151966: 221967: 241968: 111969: 701970: 221971: 171972: 141973: 221974: 211975: 181976: 101977: 201978: 471979: 251980: 221981: 241982: 91983: 651984: 381986: 201987: 371988: 61989: 161991: 21992: 51993: 61994: 41995: 81996: 291997: 431998: 321999: 392000: 122001: 72002: 112003: 172004: 102005: 102006: 222007: 72008: 82009: 862010: 502011: 241942194819661972197819841992199820042010
1,464 records at Atotonilco El Alto still stand. 1948 holds the most, with 95.
Standing records at Atotonilco El Alto by the year they were set
Year setStanding records
194217
194344
194446
194565
194651
194748
194895
194930
19557
196322
196412
196515
196622
196724
196811
196970
197022
197117
197214
197322
197421
197518
197610
197720
197847
197925
198022
198124
19829
198365
198438
198620
198737
19886
198916
19912
19925
19936
19944
19958
199629
199743
199832
199939
200012
20017
200211
200317
200410
200510
200622
20077
20088
200986
201050
201124

All-Time Record Progression

3 new records
When Atotonilco El Alto set new all-time records 3 all-time records were set at Atotonilco El Alto between 16 September 2003 and 23 December 2009. Each dot is a new record. Record high minimum temperatureRecord low maximum temperature16 September 2003: Record high minimum temperature 22.8 C (73.0 F)17 September 2003: Record high minimum temperature 23.3 C (73.9 F)23 December 2009: Record low maximum temperature 10.0 C (50.0 F)20052010
3 all-time records were set at Atotonilco El Alto between 16 September 2003 and 23 December 2009. Each dot is a new record.
When Atotonilco El Alto set new all-time records
DateKindDetail
2003-09-16Record high minimum temperatureRecord high minimum temperature 22.8 C (73.0 F)
2003-09-17Record high minimum temperatureRecord high minimum temperature 23.3 C (73.9 F)
2009-12-23Record low maximum temperatureRecord low maximum temperature 10.0 C (50.0 F)

Wettest Day of Each Month

Nov: 104.9 mm (4.1 in)
Record daily precipitation for each month at Atotonilco El Alto The wettest day on record for each calendar month at Atotonilco El Alto. The most was 104.9 mm (4.1 in) on 4 November 1952. 050100150 Jan: 44.5 mm (1.8 in), 25 January 1992 Jan Feb: 65.3 mm (2.6 in), 3 February 2010 Feb Mar: 39.4 mm (1.6 in), 4 March 1968 Mar Apr: 32.0 mm (1.3 in), 9 April 1948 Apr May: 87.4 mm (3.4 in), 31 May 2004 May Jun: 95.0 mm (3.7 in), 23 June 2005 Jun Jul: 100.8 mm (4.0 in), 12 July 1975 Jul Aug: 70.1 mm (2.8 in), 29 August 1971 Aug Sep: 78.5 mm (3.1 in), 6 September 2003 Sep Oct: 59.9 mm (2.4 in), 16 October 1955 Oct Nov: 104.9 mm (4.1 in), 4 November 1952 Nov Dec: 19.8 mm (0.8 in), 3 December 1979 Dec
The wettest day on record for each calendar month at Atotonilco El Alto. The most was 104.9 mm (4.1 in) on 4 November 1952.
Record daily precipitation for each month at Atotonilco El Alto
MonthRecord daily precipitation (mm)Date
Jan44.5 mm (1.8 in)25 January 1992
Feb65.3 mm (2.6 in)3 February 2010
Mar39.4 mm (1.6 in)4 March 1968
Apr32.0 mm (1.3 in)9 April 1948
May87.4 mm (3.4 in)31 May 2004
Jun95.0 mm (3.7 in)23 June 2005
Jul100.8 mm (4.0 in)12 July 1975
Aug70.1 mm (2.8 in)29 August 1971
Sep78.5 mm (3.1 in)6 September 2003
Oct59.9 mm (2.4 in)16 October 1955
Nov104.9 mm (4.1 in)4 November 1952
Dec19.8 mm (0.8 in)3 December 1979

Period of Record Coverage

1942 to 2012
Days with data per year at Atotonilco El Alto 56 years of record at Atotonilco El Alto, 1942 to 2012. 15 years have data for under 90 percent of days and are left out of rankings: 1942, 1949, 1963, 1984, 1986, 1988, 1991, 1992 and others. 1942: 98 of 365 days1943: 364 of 365 days1944: 365 of 366 days1945: 365 of 365 days1946: 365 of 365 days1947: 364 of 365 days1948: 365 of 366 days1949: 100 of 365 days1963: 213 of 365 days1964: 366 of 366 days1965: 365 of 365 days1966: 365 of 365 days1967: 365 of 365 days1968: 363 of 366 days1969: 362 of 365 days1970: 365 of 365 days1971: 365 of 365 days1972: 365 of 366 days1973: 365 of 365 days1974: 365 of 365 days1975: 365 of 365 days1976: 365 of 366 days1977: 364 of 365 days1978: 364 of 365 days1979: 365 of 365 days1980: 365 of 366 days1981: 365 of 365 days1982: 365 of 365 days1983: 365 of 365 days1984: 298 of 366 days1986: 299 of 365 days1987: 363 of 365 days1988: 214 of 366 days1989: 334 of 365 days1991: 81 of 365 days1992: 25 of 366 days1993: 146 of 365 days1994: 306 of 365 days1995: 349 of 365 days1996: 366 of 366 days1997: 321 of 365 days1998: 346 of 365 days1999: 344 of 365 days2000: 339 of 366 days2001: 288 of 365 days2002: 285 of 365 days2003: 331 of 365 days2004: 340 of 366 days2005: 355 of 365 days2006: 365 of 365 days2007: 357 of 365 days2008: 323 of 366 days2009: 350 of 365 days2010: 364 of 365 days2011: 355 of 365 days2012: 31 of 366 days1970198020002010
56 years of record at Atotonilco El Alto, 1942 to 2012. 15 years have data for under 90 percent of days and are left out of rankings: 1942, 1949, 1963, 1984, 1986, 1988, 1991, 1992 and others.
Days with data per year at Atotonilco El Alto
YearDays with dataShare of yearComplete
19429827%No
1943364100%Yes
1944365100%Yes
1945365100%Yes
1946365100%Yes
1947364100%Yes
1948365100%Yes
194910027%No
196321358%No
1964366100%Yes
1965365100%Yes
1966365100%Yes
1967365100%Yes
196836399%Yes
196936299%Yes
1970365100%Yes
1971365100%Yes
1972365100%Yes
1973365100%Yes
1974365100%Yes
1975365100%Yes
1976365100%Yes
1977364100%Yes
1978364100%Yes
1979365100%Yes
1980365100%Yes
1981365100%Yes
1982365100%Yes
1983365100%Yes
198429881%No
198629982%No
198736399%Yes
198821458%No
198933492%Yes
19918122%No
1992257%No
199314640%No
199430684%No
199534996%Yes
1996366100%Yes
199732188%No
199834695%Yes
199934494%Yes
200033993%Yes
200128879%No
200228578%No
200333191%Yes
200434093%Yes
200535597%Yes
2006365100%Yes
200735798%Yes
200832388%No
200935096%Yes
2010364100%Yes
201135597%Yes
2012318%No

Latest Records

20
Latest records at Atotonilco El Alto
DateStationRecordValueBeat old record byOld record stoodSignificance
30 December 2011Atotonilco El Alto, MXdaily high max (Tie)28.3 C (82.9 F)tie45 years5 of 100 (Routine)
29 December 2011Atotonilco El Alto, MXdaily high max (Tie)28.3 C (82.9 F)tie44 years5 of 100 (Routine)
28 December 2011Atotonilco El Alto, MXdaily high max (Tie)28.3 C (82.9 F)tie65 years6 of 100 (Routine)
12 December 2011Atotonilco El Alto, MXdaily low max (Tie)20.0 C (68.0 F)tie64 years6 of 100 (Routine)
1 December 2011Atotonilco El Alto, MXdaily low min (Tie)1.7 C (35.1 F)tie12 years2 of 100 (Routine)
29 November 2011Atotonilco El Alto, MXmonthly low min (Tie)0.0 C (32.0 F)tie14 years5 of 100 (Routine)
27 October 2011Atotonilco El Alto, MXdaily low max18.3 C (64.9 F)1.7 C (3.1 F)1 year14 of 100 (Routine)
10 October 2011Atotonilco El Alto, MXdaily high min (Tie)16.7 C (62.1 F)tie33 years4 of 100 (Routine)
4 October 2011Atotonilco El Alto, MXdaily high max (Tie)30.6 C (87.1 F)tie66 years6 of 100 (Routine)
3 October 2011Atotonilco El Alto, MXdaily high max (Tie)30.6 C (87.1 F)tie29 years3 of 100 (Routine)
28 September 2011Atotonilco El Alto, MXdaily high max (Tie)31.7 C (89.1 F)tie62 years6 of 100 (Routine)
27 September 2011Atotonilco El Alto, MXdaily high min (Tie)16.7 C (62.1 F)tie68 years6 of 100 (Routine)
26 September 2011Atotonilco El Alto, MXdaily high min (Tie)16.7 C (62.1 F)tie68 years6 of 100 (Routine)
25 September 2011Atotonilco El Alto, MXdaily high min (Tie)16.7 C (62.1 F)tie2 years1 of 100 (Routine)
24 September 2011Atotonilco El Alto, MXdaily high max (Tie)30.6 C (87.1 F)tie64 years6 of 100 (Routine)
18 September 2011Atotonilco El Alto, MXdaily high max (Tie)31.1 C (88.0 F)tie9 years2 of 100 (Routine)
9 September 2011Atotonilco El Alto, MXdaily low min7.8 C (46.0 F)1.6 C (2.9 F)24 years21 of 100 (Routine)
4 September 2011Atotonilco El Alto, MXdaily high min17.8 C (64.0 F)0.6 C (1.1 F)65 years28 of 100 (Routine)
3 September 2011Atotonilco El Alto, MXdaily high min17.8 C (64.0 F)1.1 C (2.0 F)8 years14 of 100 (Routine)
2 September 2011Atotonilco El Alto, MXdaily high min (Tie)16.7 C (62.1 F)tie33 years4 of 100 (Routine)

Climate Trend

31 complete years, 1943 to 2011
Annual mean temperature at Atotonilco El Alto as warming stripes, 1943 to 2011 One stripe for each of 31 complete years at Atotonilco El Alto, 1943 to 2011. Blue stripes are years cooler than the station's own mean of 19.8 C (67.6 F); red stripes are warmer. The coolest year was 1983, at 18.5 C (65.3 F), and the warmest was 1948, at 21.2 C (70.1 F). The strongest colour marks a difference of 1.5 C (2.7 F). 1943: 20.6 C, +0.8 C from the station mean1944: 20.4 C, +0.6 C from the station mean1945: 21.1 C, +1.3 C from the station mean1947: 20.3 C, +0.5 C from the station mean1948: 21.2 C, +1.4 C from the station mean1964: 19.6 C, -0.2 C from the station mean1965: 19.6 C, -0.1 C from the station mean1966: 19.2 C, -0.5 C from the station mean1967: 19.7 C, -0.1 C from the station mean1968: 19.5 C, -0.2 C from the station mean1969: 19.4 C, -0.3 C from the station mean1970: 19.2 C, -0.6 C from the station mean1971: 19.5 C, -0.2 C from the station mean1972: 20.0 C, +0.2 C from the station mean1973: 19.5 C, -0.3 C from the station mean1974: 19.4 C, -0.4 C from the station mean1975: 19.3 C, -0.5 C from the station mean1976: 19.4 C, -0.4 C from the station mean1977: 19.8 C, +0.1 C from the station mean1978: 19.2 C, -0.6 C from the station mean1979: 19.9 C, +0.2 C from the station mean1980: 20.2 C, +0.4 C from the station mean1981: 20.0 C, +0.2 C from the station mean1982: 20.1 C, +0.3 C from the station mean1983: 18.5 C, -1.3 C from the station mean1999: 18.5 C, -1.2 C from the station mean2005: 20.1 C, +0.4 C from the station mean2006: 20.1 C, +0.3 C from the station mean2007: 19.9 C, +0.1 C from the station mean2010: 19.5 C, -0.3 C from the station mean2011: 20.1 C, +0.3 C from the station mean19431950196019701980199020002010
One stripe for each of 31 complete years at Atotonilco El Alto, 1943 to 2011. Blue stripes are years cooler than the station's own mean of 19.8 C (67.6 F); red stripes are warmer. The coolest year was 1983, at 18.5 C (65.3 F), and the warmest was 1948, at 21.2 C (70.1 F). The strongest colour marks a difference of 1.5 C (2.7 F).
Annual mean temperature at Atotonilco El Alto as warming stripes, 1943 to 2011
YearAnnual mean temperatureDifference from the station mean
194320.6 C+0.82 C
194420.4 C+0.61 C
194521.1 C+1.34 C
194720.3 C+0.49 C
194821.2 C+1.43 C
196419.6 C-0.16 C
196519.6 C-0.15 C
196619.2 C-0.55 C
196719.7 C-0.07 C
196819.5 C-0.25 C
196919.4 C-0.33 C
197019.2 C-0.59 C
197119.5 C-0.25 C
197220.0 C+0.19 C
197319.5 C-0.31 C
197419.4 C-0.38 C
197519.3 C-0.49 C
197619.4 C-0.37 C
197719.8 C+0.05 C
197819.2 C-0.57 C
197919.9 C+0.17 C
198020.2 C+0.40 C
198120.0 C+0.20 C
198220.1 C+0.32 C
198318.5 C-1.26 C
199918.5 C-1.23 C
200520.1 C+0.37 C
200620.1 C+0.34 C
200719.9 C+0.10 C
201019.5 C-0.30 C
201120.1 C+0.34 C

The annual mean temperature here has fallen by 0.12 C (0.01 to 0.23) per decade over 1943 to 2011. In Fahrenheit: 0.21 F (0.01 to 0.41) 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 Atotonilco El Alto
MeasurePer decade (C)Per decade (F)PeriodComplete yearsReading
Annual mean temperature-0.12 C (-0.23 to -0.01) per decade-0.21 F (-0.41 to -0.01) per decade1943 to 201131Fall
Mean daily maximum0.00 C (-0.16 to 0.15) per decade-0.01 F (-0.29 to 0.28) per decade1943 to 201131Not clearly different from zero
Mean daily minimum-0.2 C (-0.4 to -0.1) per decade-0.4 F (-0.7 to -0.2) per decade1943 to 201131Fall

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

1942 to 2012
Yearly extremes at Atotonilco El Alto: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)39.4 C (102.9 F)194735.9 C (96.5 F)56
Coldest night (TNn)-2.2 C (28.0 F)19872.8 C (37.0 F)57
Wettest day (Rx1day)104.9 mm (4.1 in)195255.4 mm (2.2 in)69
Wettest five days (Rx5day)237.0 mm (9.3 in)1976111.5 mm (4.4 in)69
Longest dry spell (CDD)172 days196992 days69

Hottest day (TXx)

Hottest day (TXx) at Atotonilco El Alto by year The hottest day of the year at Atotonilco El Alto, 1942 to 2012. The record is 39.4 C (102.9 F) in 1947, marked on the chart; the median year is 35.9 C (96.5 F). 2025303540196019802000Record: 39.4 C (102.9 F) in 1947
The hottest day of the year at Atotonilco El Alto, 1942 to 2012. The record is 39.4 C (102.9 F) in 1947, marked on the chart; the median year is 35.9 C (96.5 F).
Hottest day (TXx) at Atotonilco El Alto by year
YearHottest day (TXx)
194233.3 C (91.9 F)
194338.3 C (100.9 F)
194435.6 C (96.1 F)
194538.9 C (102.0 F)
194638.9 C (102.0 F)
194739.4 C (102.9 F)
194838.9 C (102.0 F)
194934.4 C (93.9 F)
1950n/a
1951n/a
1952n/a
1953n/a
1954n/a
1955n/a
1956n/a
1957n/a
1958n/a
1959n/a
1960n/a
1961n/a
1962n/a
196337.8 C (100.0 F)
196436.1 C (97.0 F)
196537.8 C (100.0 F)
196636.1 C (97.0 F)
196736.1 C (97.0 F)
196835.0 C (95.0 F)
196937.2 C (99.0 F)
197035.6 C (96.1 F)
197136.1 C (97.0 F)
197235.0 C (95.0 F)
197335.0 C (95.0 F)
197434.4 C (93.9 F)
197535.0 C (95.0 F)
197635.6 C (96.1 F)
197735.6 C (96.1 F)
197835.0 C (95.0 F)
197935.0 C (95.0 F)
198039.4 C (102.9 F)
198135.6 C (96.1 F)
198236.1 C (97.0 F)
198336.7 C (98.1 F)
198433.9 C (93.0 F)
198636.1 C (97.0 F)
198734.4 C (93.9 F)
198835.0 C (95.0 F)
198936.1 C (97.0 F)
199128.9 C (84.0 F)
199223.9 C (75.0 F)
199332.8 C (91.0 F)
199435.6 C (96.1 F)
199536.1 C (97.0 F)
199634.4 C (93.9 F)
199733.9 C (93.0 F)
199836.1 C (97.0 F)
199935.6 C (96.1 F)
200035.0 C (95.0 F)
200136.1 C (97.0 F)
200236.7 C (98.1 F)
200337.2 C (99.0 F)
200435.0 C (95.0 F)
200537.8 C (100.0 F)
200639.4 C (102.9 F)
200735.0 C (95.0 F)
200837.2 C (99.0 F)
200936.1 C (97.0 F)
201036.1 C (97.0 F)
201137.8 C (100.0 F)
201229.4 C (84.9 F)

Coldest night (TNn)

Coldest night (TNn) at Atotonilco El Alto by year The coldest night of the year at Atotonilco El Alto, 1942 to 2012. The record is -2.2 C (28.0 F) in 1987, marked on the chart; the median year is 2.8 C (37.0 F). -2.502.557.5196019802000Record: -2.2 C (28.0 F) in 1987
The coldest night of the year at Atotonilco El Alto, 1942 to 2012. The record is -2.2 C (28.0 F) in 1987, marked on the chart; the median year is 2.8 C (37.0 F).
Coldest night (TNn) at Atotonilco El Alto by year
YearColdest night (TNn)
19423.9 C (39.0 F)
19432.2 C (36.0 F)
19442.8 C (37.0 F)
19453.9 C (39.0 F)
19465.0 C (41.0 F)
19475.0 C (41.0 F)
19483.9 C (39.0 F)
19496.7 C (44.1 F)
1950n/a
1951n/a
1952n/a
1953n/a
1954n/a
19555.0 C (41.0 F)
1956n/a
1957n/a
1958n/a
1959n/a
1960n/a
1961n/a
1962n/a
19636.7 C (44.1 F)
19641.1 C (34.0 F)
19652.8 C (37.0 F)
19661.1 C (34.0 F)
19673.3 C (37.9 F)
19684.4 C (39.9 F)
19692.8 C (37.0 F)
19701.7 C (35.1 F)
19713.9 C (39.0 F)
19723.9 C (39.0 F)
19731.7 C (35.1 F)
19744.4 C (39.9 F)
19751.1 C (34.0 F)
19762.2 C (36.0 F)
19774.4 C (39.9 F)
19783.9 C (39.0 F)
19793.9 C (39.0 F)
19804.4 C (39.9 F)
19812.8 C (37.0 F)
19824.4 C (39.9 F)
19830.0 C (32.0 F)
19842.8 C (37.0 F)
19861.7 C (35.1 F)
1987-2.2 C (28.0 F)
19883.9 C (39.0 F)
19892.8 C (37.0 F)
19914.4 C (39.9 F)
19924.4 C (39.9 F)
19934.4 C (39.9 F)
19943.3 C (37.9 F)
19951.7 C (35.1 F)
19960.0 C (32.0 F)
19970.0 C (32.0 F)
19980.0 C (32.0 F)
19990.0 C (32.0 F)
20002.8 C (37.0 F)
20015.0 C (41.0 F)
20020.6 C (33.1 F)
20031.7 C (35.1 F)
20040.6 C (33.1 F)
20052.8 C (37.0 F)
20060.6 C (33.1 F)
20073.9 C (39.0 F)
20082.2 C (36.0 F)
20093.3 C (37.9 F)
20100.0 C (32.0 F)
20110.0 C (32.0 F)
20122.8 C (37.0 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Atotonilco El Alto by year The wettest day of the year at Atotonilco El Alto, 1942 to 2012. The record is 104.9 mm (4.1 in) in 1952, marked on the chart; the median year is 55.4 mm (2.2 in). 050100150196019802000Record: 104.9 mm (4.1 in) in 1952
The wettest day of the year at Atotonilco El Alto, 1942 to 2012. The record is 104.9 mm (4.1 in) in 1952, marked on the chart; the median year is 55.4 mm (2.2 in).
Wettest day (Rx1day) at Atotonilco El Alto by year
YearWettest day (Rx1day)
19429.7 mm (0.38 in)
194349.3 mm (1.9 in)
194456.6 mm (2.2 in)
194542.9 mm (1.7 in)
194658.9 mm (2.3 in)
194749.3 mm (1.9 in)
194881.0 mm (3.2 in)
194946.7 mm (1.8 in)
195079.0 mm (3.1 in)
195137.1 mm (1.5 in)
1952104.9 mm (4.1 in)
195335.8 mm (1.4 in)
195446.7 mm (1.8 in)
195559.9 mm (2.4 in)
195663.5 mm (2.5 in)
195753.3 mm (2.1 in)
195863.0 mm (2.5 in)
195947.8 mm (1.9 in)
196054.9 mm (2.2 in)
196179.8 mm (3.1 in)
196248.0 mm (1.9 in)
196380.5 mm (3.2 in)
196443.9 mm (1.7 in)
196586.9 mm (3.4 in)
196649.5 mm (1.9 in)
196772.1 mm (2.8 in)
196878.0 mm (3.1 in)
196943.7 mm (1.7 in)
197054.4 mm (2.1 in)
197170.1 mm (2.8 in)
197257.4 mm (2.3 in)
197368.6 mm (2.7 in)
197457.7 mm (2.3 in)
1975100.8 mm (4.0 in)
197690.2 mm (3.6 in)
197757.2 mm (2.3 in)
197861.2 mm (2.4 in)
197948.3 mm (1.9 in)
198052.3 mm (2.1 in)
198145.7 mm (1.8 in)
198231.0 mm (1.2 in)
198356.4 mm (2.2 in)
198463.0 mm (2.5 in)
198650.3 mm (2.0 in)
198749.5 mm (1.9 in)
198855.9 mm (2.2 in)
198947.0 mm (1.9 in)
19916.1 mm (0.24 in)
199244.5 mm (1.8 in)
199348.8 mm (1.9 in)
199461.5 mm (2.4 in)
199548.8 mm (1.9 in)
199642.2 mm (1.7 in)
199752.3 mm (2.1 in)
199875.4 mm (3.0 in)
199993.0 mm (3.7 in)
200078.0 mm (3.1 in)
200155.4 mm (2.2 in)
200244.5 mm (1.8 in)
200378.5 mm (3.1 in)
200487.4 mm (3.4 in)
200595.0 mm (3.7 in)
200632.8 mm (1.3 in)
200743.4 mm (1.7 in)
200857.4 mm (2.3 in)
200955.6 mm (2.2 in)
201065.3 mm (2.6 in)
201135.6 mm (1.4 in)
20123.0 mm (0.12 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Atotonilco El Alto by year The wettest five days of the year at Atotonilco El Alto, 1942 to 2012. The record is 237.0 mm (9.3 in) in 1976, marked on the chart; the median year is 111.5 mm (4.4 in). 0100200300196019802000Record: 237.0 mm (9.3 in) in 1976
The wettest five days of the year at Atotonilco El Alto, 1942 to 2012. The record is 237.0 mm (9.3 in) in 1976, marked on the chart; the median year is 111.5 mm (4.4 in).
Wettest five days (Rx5day) at Atotonilco El Alto by year
YearWettest five days (Rx5day)
194218.3 mm (0.7 in)
1943106.9 mm (4.2 in)
1944141.1 mm (5.6 in)
194593.7 mm (3.7 in)
1946100.8 mm (4.0 in)
1947124.8 mm (4.9 in)
1948189.7 mm (7.5 in)
1949102.0 mm (4.0 in)
1950152.7 mm (6.0 in)
195174.7 mm (2.9 in)
1952116.7 mm (4.6 in)
195387.4 mm (3.4 in)
1954115.5 mm (4.5 in)
1955140.3 mm (5.5 in)
1956118.9 mm (4.7 in)
1957110.9 mm (4.4 in)
1958129.5 mm (5.1 in)
195990.0 mm (3.5 in)
1960108.4 mm (4.3 in)
1961158.2 mm (6.2 in)
1962144.2 mm (5.7 in)
196396.2 mm (3.8 in)
1964116.9 mm (4.6 in)
1965204.1 mm (8.0 in)
1966117.8 mm (4.6 in)
1967136.2 mm (5.4 in)
1968132.9 mm (5.2 in)
196997.6 mm (3.8 in)
1970111.5 mm (4.4 in)
1971130.4 mm (5.1 in)
197286.1 mm (3.4 in)
1973149.3 mm (5.9 in)
1974106.9 mm (4.2 in)
1975188.9 mm (7.4 in)
1976237.0 mm (9.3 in)
1977109.7 mm (4.3 in)
197875.5 mm (3.0 in)
197990.7 mm (3.6 in)
1980124.4 mm (4.9 in)
198195.4 mm (3.8 in)
198281.5 mm (3.2 in)
1983166.4 mm (6.6 in)
1984118.6 mm (4.7 in)
198674.4 mm (2.9 in)
198799.2 mm (3.9 in)
1988101.7 mm (4.0 in)
198995.8 mm (3.8 in)
19916.4 mm (0.25 in)
199265.3 mm (2.6 in)
1993148.9 mm (5.9 in)
1994108.0 mm (4.3 in)
1995116.8 mm (4.6 in)
199665.3 mm (2.6 in)
199771.7 mm (2.8 in)
1998120.6 mm (4.7 in)
1999112.3 mm (4.4 in)
2000123.5 mm (4.9 in)
2001103.2 mm (4.1 in)
200295.7 mm (3.8 in)
2003216.9 mm (8.5 in)
2004168.8 mm (6.6 in)
2005111.8 mm (4.4 in)
200667.3 mm (2.6 in)
200789.7 mm (3.5 in)
2008136.0 mm (5.4 in)
2009130.6 mm (5.1 in)
2010152.7 mm (6.0 in)
201184.4 mm (3.3 in)
20123.0 mm (0.12 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Atotonilco El Alto by year The longest dry spell of the year at Atotonilco El Alto, 1942 to 2012. The record is 172 days in 1969, marked on the chart; the median year is 92 days. 050100150200196019802000Record: 172 days in 1969
The longest dry spell of the year at Atotonilco El Alto, 1942 to 2012. The record is 172 days in 1969, marked on the chart; the median year is 92 days.
Longest dry spell (CDD) at Atotonilco El Alto by year
YearLongest dry spell (CDD)
194223 days
1943117 days
194462 days
1945118 days
194645 days
1947109 days
194870 days
194938 days
1950144 days
195174 days
195259 days
1953112 days
195496 days
1955119 days
1956112 days
1957126 days
1958119 days
1959105 days
1960139 days
1961114 days
1962105 days
196369 days
1964108 days
196579 days
196649 days
1967122 days
196870 days
1969172 days
1970158 days
1971131 days
1972108 days
1973119 days
1974114 days
1975123 days
197691 days
1977102 days
197887 days
197999 days
198067 days
198141 days
1982138 days
1983125 days
198489 days
198660 days
198797 days
198872 days
1989126 days
199141 days
19925 days
199323 days
199447 days
199584 days
199686 days
199777 days
199892 days
199997 days
2000108 days
200170 days
200282 days
200371 days
200461 days
2005100 days
200657 days
200757 days
200881 days
200961 days
2010112 days
2011153 days
201230 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

56 years, 1943 to 2011

A day with at least 57.0 mm (2.2 in) of rain is expected about once in 2 years. A day with at least 119.5 mm (4.7 in) of rain is expected about once in 100 years.

Rainfall return levels at Atotonilco El Alto: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years57.0 mm (2.2 in)
5 years73.5 mm (2.9 in)
10 years84.6 mm (3.3 in)
25 years98.6 mm (3.9 in)
50 years109.1 mm (4.3 in)
100 years119.5 mm (4.7 in)Longer than the 56 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, 56 years of values from 1943 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: 104.9 mm (4.1 in) in 1952; 100.8 mm (4.0 in) in 1975; 95.0 mm (3.7 in) in 2005.

Download the Data

  • Data for Atotonilco El Alto standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Atotonilco El Alto 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).