Ajochitlan Weather Records (MXN00012138)
Record envelope, standing records and threshold days for Ajochitlan (MXN00012138), Mexico, with 42 years of record.
Key Facts for Ajochitlan
- Ajochitlan (MXN00012138) is a weather station in Mexico at 18.15 latitude and -100.50 longitude, 280 m (918 ft) above sea level.
- The station reports from 1972 to 2013, 42 years of record.
- 1,464 records set at Ajochitlan still stand.
- Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
- Ajochitlan tied a daily record high minimum temperature of 25.0 C (77.0 F) on 26 June 2013.
About the Station
- Location: Mexico, 18.15 latitude, -100.50 longitude.
- Elevation: 280 m (918 ft).
- Period of record: 1972 to 2013, 42 years.
- Eligible elements: tmax, tmin, prcp.
Daily Record Envelope and 2026
0 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 40.0 C (104.0 F) | 6.1 C (43.0 F) | n/a | n/a |
| Feb | 42.2 C (108.0 F) | 10.0 C (50.0 F) | n/a | n/a |
| Mar | 44.4 C (111.9 F) | 12.2 C (54.0 F) | n/a | n/a |
| Apr | 48.3 C (118.9 F) | 15.0 C (59.0 F) | n/a | n/a |
| May | 49.4 C (120.9 F) | 16.1 C (61.0 F) | n/a | n/a |
| Jun | 48.9 C (120.0 F) | 15.0 C (59.0 F) | n/a | n/a |
| Jul | 44.4 C (111.9 F) | 11.7 C (53.1 F) | n/a | n/a |
| Aug | 44.4 C (111.9 F) | 14.4 C (57.9 F) | n/a | n/a |
| Sep | 41.1 C (106.0 F) | 15.6 C (60.1 F) | n/a | n/a |
| Oct | 41.1 C (106.0 F) | 13.9 C (57.0 F) | n/a | n/a |
| Nov | 41.1 C (106.0 F) | 10.6 C (51.1 F) | n/a | n/a |
| Dec | 41.1 C (106.0 F) | 10.0 C (50.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1972 | 8 |
| 1973 | 44 |
| 1974 | 7 |
| 1975 | 15 |
| 1976 | 7 |
| 1977 | 67 |
| 1978 | 21 |
| 1979 | 92 |
| 1980 | 62 |
| 1981 | 9 |
| 1982 | 7 |
| 1983 | 37 |
| 1984 | 11 |
| 1985 | 11 |
| 1986 | 10 |
| 1987 | 7 |
| 1988 | 10 |
| 1989 | 14 |
| 1990 | 30 |
| 1991 | 12 |
| 1992 | 39 |
| 1993 | 23 |
| 1994 | 47 |
| 1995 | 68 |
| 1996 | 82 |
| 1997 | 96 |
| 1998 | 91 |
| 1999 | 100 |
| 2000 | 14 |
| 2001 | 80 |
| 2002 | 25 |
| 2006 | 40 |
| 2008 | 75 |
| 2009 | 68 |
| 2010 | 18 |
| 2011 | 19 |
| 2012 | 80 |
| 2013 | 18 |
Wettest Day of Each Month
Sep: 118.4 mm (4.7 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 64.8 mm (2.6 in) | 24 January 1980 |
| Feb | 78.0 mm (3.1 in) | 3 February 2010 |
| Mar | 21.6 mm (0.9 in) | 4 March 1988 |
| Apr | 11.4 mm (0.4 in) | 26 April 1987 |
| May | 62.0 mm (2.4 in) | 19 May 1980 |
| Jun | 94.0 mm (3.7 in) | 26 June 2002 |
| Jul | 97.8 mm (3.9 in) | 9 July 2000 |
| Aug | 95.8 mm (3.8 in) | 6 August 1998 |
| Sep | 118.4 mm (4.7 in) | 10 September 1998 |
| Oct | 92.7 mm (3.6 in) | 18 October 1998 |
| Nov | 42.4 mm (1.7 in) | 12 November 1992 |
| Dec | 36.3 mm (1.4 in) | 29 December 1995 |
Period of Record Coverage
1972 to 2013| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1972 | 233 | 64% | No |
| 1973 | 365 | 100% | Yes |
| 1974 | 365 | 100% | Yes |
| 1975 | 365 | 100% | Yes |
| 1976 | 366 | 100% | Yes |
| 1977 | 365 | 100% | Yes |
| 1978 | 365 | 100% | Yes |
| 1979 | 365 | 100% | Yes |
| 1980 | 366 | 100% | Yes |
| 1981 | 365 | 100% | Yes |
| 1982 | 365 | 100% | Yes |
| 1983 | 365 | 100% | Yes |
| 1984 | 366 | 100% | Yes |
| 1985 | 365 | 100% | Yes |
| 1986 | 364 | 100% | Yes |
| 1987 | 365 | 100% | Yes |
| 1988 | 366 | 100% | Yes |
| 1989 | 365 | 100% | Yes |
| 1990 | 364 | 100% | Yes |
| 1991 | 365 | 100% | Yes |
| 1992 | 366 | 100% | Yes |
| 1993 | 365 | 100% | Yes |
| 1994 | 364 | 100% | Yes |
| 1995 | 363 | 99% | Yes |
| 1996 | 366 | 100% | Yes |
| 1997 | 364 | 100% | Yes |
| 1998 | 365 | 100% | Yes |
| 1999 | 365 | 100% | Yes |
| 2000 | 366 | 100% | Yes |
| 2001 | 365 | 100% | Yes |
| 2002 | 181 | 50% | No |
| 2006 | 153 | 42% | No |
| 2008 | 344 | 94% | Yes |
| 2009 | 365 | 100% | Yes |
| 2010 | 365 | 100% | Yes |
| 2011 | 320 | 88% | No |
| 2012 | 364 | 99% | Yes |
| 2013 | 150 | 41% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 26 June 2013 | Ajochitlan, MX | daily high min (Tie) | 25.0 C (77.0 F) | tie | 20 years | 2 of 100 (Routine) |
| 25 June 2013 | Ajochitlan, MX | daily high min (Tie) | 25.0 C (77.0 F) | tie | 11 years | 1 of 100 (Routine) |
| 25 May 2013 | Ajochitlan, MX | daily rain | 7.9 mm (0.31 in) | 2.1 mm (0.08 in) | 36 years | 16 of 100 (Routine) |
| 21 May 2013 | Ajochitlan, MX | daily low max (Tie) | 33.9 C (93.0 F) | tie | 4 years | 1 of 100 (Routine) |
| 20 May 2013 | Ajochitlan, MX | daily low max (Tie) | 33.9 C (93.0 F) | tie | 4 years | 1 of 100 (Routine) |
| 19 May 2013 | Ajochitlan, MX | daily low max (Tie) | 33.9 C (93.0 F) | tie | 4 years | 1 of 100 (Routine) |
| 18 May 2013 | Ajochitlan, MX | daily low max (Tie) | 33.9 C (93.0 F) | tie | 4 years | 1 of 100 (Routine) |
| 17 May 2013 | Ajochitlan, MX | daily low max (Tie) | 33.9 C (93.0 F) | tie | 4 years | 1 of 100 (Routine) |
| 16 May 2013 | Ajochitlan, MX | daily low max (Tie) | 33.9 C (93.0 F) | tie | 0 years | 1 of 100 (Routine) |
| 15 May 2013 | Ajochitlan, MX | daily low max (Tie) | 33.9 C (93.0 F) | tie | 0 years | 1 of 100 (Routine) |
| 11 May 2013 | Ajochitlan, MX | daily low max | 32.8 C (91.0 F) | 2.8 C (5.0 F) | 12 years | 15 of 100 (Routine) |
| 10 May 2013 | Ajochitlan, MX | daily low max | 32.8 C (91.0 F) | 2.2 C (4.0 F) | 4 years | 11 of 100 (Routine) |
| 9 May 2013 | Ajochitlan, MX | daily low max | 32.8 C (91.0 F) | 2.2 C (4.0 F) | 4 years | 11 of 100 (Routine) |
| 8 May 2013 | Ajochitlan, MX | daily low max | 32.8 C (91.0 F) | 2.2 C (4.0 F) | 4 years | 11 of 100 (Routine) |
| 7 May 2013 | Ajochitlan, MX | daily low max | 31.7 C (89.1 F) | 2.2 C (4.0 F) | 4 years | 11 of 100 (Routine) |
| 6 May 2013 | Ajochitlan, MX | daily low max | 31.7 C (89.1 F) | 0.5 C (0.9 F) | 23 years | 11 of 100 (Routine) |
| 5 May 2013 | Ajochitlan, MX | daily low max | 31.7 C (89.1 F) | 2.2 C (4.0 F) | 0 years | 10 of 100 (Routine) |
| 4 May 2013 | Ajochitlan, MX | daily low max | 31.7 C (89.1 F) | 2.2 C (4.0 F) | 0 years | 10 of 100 (Routine) |
| 3 May 2013 | Ajochitlan, MX | daily low max | 31.7 C (89.1 F) | 1.1 C (2.0 F) | 0 years | 7 of 100 (Routine) |
| 2 May 2013 | Ajochitlan, MX | daily low max | 31.7 C (89.1 F) | 1.1 C (2.0 F) | 0 years | 7 of 100 (Routine) |
Climate Trend
30 complete years, 1973 to 2010| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1973 | 29.0 C | +1.07 C |
| 1974 | 28.2 C | +0.34 C |
| 1975 | 27.5 C | -0.37 C |
| 1976 | 27.6 C | -0.33 C |
| 1977 | 29.3 C | +1.38 C |
| 1978 | 28.1 C | +0.15 C |
| 1979 | 27.3 C | -0.57 C |
| 1980 | 26.9 C | -1.03 C |
| 1981 | 27.0 C | -0.93 C |
| 1982 | 27.7 C | -0.16 C |
| 1983 | 28.7 C | +0.76 C |
| 1984 | 27.2 C | -0.70 C |
| 1985 | 26.9 C | -0.96 C |
| 1986 | 27.3 C | -0.62 C |
| 1987 | 27.5 C | -0.39 C |
| 1988 | 27.3 C | -0.59 C |
| 1989 | 28.1 C | +0.17 C |
| 1990 | 28.0 C | +0.07 C |
| 1991 | 27.6 C | -0.32 C |
| 1992 | 27.3 C | -0.59 C |
| 1993 | 28.2 C | +0.26 C |
| 1994 | 29.2 C | +1.30 C |
| 1995 | 29.2 C | +1.27 C |
| 1996 | 29.0 C | +1.14 C |
| 1997 | 28.9 C | +0.97 C |
| 1998 | 26.6 C | -1.28 C |
| 1999 | 26.9 C | -0.98 C |
| 2000 | 27.8 C | -0.08 C |
| 2001 | 29.5 C | +1.58 C |
| 2010 | 27.3 C | -0.59 C |
The fitted trend in annual mean temperature here over 1973 to 2010 is 0.05 C (-0.30 to 0.39) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.5 to 0.7) per decade. The slope is a straight line fitted to 30 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.05 C (-0.30 to 0.39) per decade | 0.1 F (-0.5 to 0.7) per decade | 1973 to 2010 | 30 | Not clearly different from zero |
| Mean daily maximum | -0.1 C (-0.8 to 0.5) per decade | -0.2 F (-1.4 to 1.0) per decade | 1973 to 2010 | 30 | Not clearly different from zero |
| Mean daily minimum | 0.2 C (-0.3 to 0.7) per decade | 0.4 F (-0.5 to 1.3) per decade | 1973 to 2010 | 30 | Not 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
1972 to 2013| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 49.4 C (120.9 F) | 1994 | 42.5 C (108.5 F) | 38 |
| Coldest night (TNn) | 6.1 C (43.0 F) | 1999 | 13.3 C (55.9 F) | 38 |
| Wettest day (Rx1day) | 118.4 mm (4.7 in) | 1998 | 67.9 mm (2.7 in) | 38 |
| Wettest five days (Rx5day) | 265.5 mm (10.5 in) | 1973 | 134.3 mm (5.3 in) | 38 |
| Longest dry spell (CDD) | 163 days | 1993 | 122 days | 38 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1972 | 41.1 C (106.0 F) |
| 1973 | 44.4 C (111.9 F) |
| 1974 | 43.3 C (109.9 F) |
| 1975 | 43.3 C (109.9 F) |
| 1976 | 42.8 C (109.0 F) |
| 1977 | 42.2 C (108.0 F) |
| 1978 | 44.4 C (111.9 F) |
| 1979 | 40.6 C (105.1 F) |
| 1980 | 42.2 C (108.0 F) |
| 1981 | 42.2 C (108.0 F) |
| 1982 | 42.2 C (108.0 F) |
| 1983 | 42.8 C (109.0 F) |
| 1984 | 41.1 C (106.0 F) |
| 1985 | 40.0 C (104.0 F) |
| 1986 | 41.7 C (107.1 F) |
| 1987 | 42.2 C (108.0 F) |
| 1988 | 41.7 C (107.1 F) |
| 1989 | 42.8 C (109.0 F) |
| 1990 | 43.3 C (109.9 F) |
| 1991 | 43.9 C (111.0 F) |
| 1992 | 44.4 C (111.9 F) |
| 1993 | 47.2 C (117.0 F) |
| 1994 | 49.4 C (120.9 F) |
| 1995 | 45.0 C (113.0 F) |
| 1996 | 49.4 C (120.9 F) |
| 1997 | 48.9 C (120.0 F) |
| 1998 | 46.1 C (115.0 F) |
| 1999 | 40.6 C (105.1 F) |
| 2000 | 42.8 C (109.0 F) |
| 2001 | 41.7 C (107.1 F) |
| 2002 | 42.8 C (109.0 F) |
| 2006 | 41.7 C (107.1 F) |
| 2008 | 45.6 C (114.1 F) |
| 2009 | 37.8 C (100.0 F) |
| 2010 | 38.9 C (102.0 F) |
| 2011 | 41.7 C (107.1 F) |
| 2012 | 40.0 C (104.0 F) |
| 2013 | 37.8 C (100.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1972 | 15.0 C (59.0 F) |
| 1973 | 13.3 C (55.9 F) |
| 1974 | 15.0 C (59.0 F) |
| 1975 | 13.3 C (55.9 F) |
| 1976 | 11.7 C (53.1 F) |
| 1977 | 13.3 C (55.9 F) |
| 1978 | 15.0 C (59.0 F) |
| 1979 | 11.7 C (53.1 F) |
| 1980 | 10.6 C (51.1 F) |
| 1981 | 12.2 C (54.0 F) |
| 1982 | 14.4 C (57.9 F) |
| 1983 | 15.0 C (59.0 F) |
| 1984 | 13.9 C (57.0 F) |
| 1985 | 14.4 C (57.9 F) |
| 1986 | 6.7 C (44.1 F) |
| 1987 | 13.9 C (57.0 F) |
| 1988 | 12.2 C (54.0 F) |
| 1989 | 12.8 C (55.0 F) |
| 1990 | 14.4 C (57.9 F) |
| 1991 | 13.9 C (57.0 F) |
| 1992 | 10.6 C (51.1 F) |
| 1993 | 11.1 C (52.0 F) |
| 1994 | 10.6 C (51.1 F) |
| 1995 | 11.1 C (52.0 F) |
| 1996 | 10.0 C (50.0 F) |
| 1997 | 6.7 C (44.1 F) |
| 1998 | 10.0 C (50.0 F) |
| 1999 | 6.1 C (43.0 F) |
| 2000 | 10.6 C (51.1 F) |
| 2001 | 17.8 C (64.0 F) |
| 2002 | 11.7 C (53.1 F) |
| 2006 | 20.6 C (69.1 F) |
| 2008 | 15.6 C (60.1 F) |
| 2009 | 20.6 C (69.1 F) |
| 2010 | 17.8 C (64.0 F) |
| 2011 | 18.9 C (66.0 F) |
| 2012 | 18.9 C (66.0 F) |
| 2013 | 20.0 C (68.0 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1972 | 65.3 mm (2.6 in) |
| 1973 | 114.8 mm (4.5 in) |
| 1974 | 66.8 mm (2.6 in) |
| 1975 | 56.9 mm (2.2 in) |
| 1976 | 79.2 mm (3.1 in) |
| 1977 | 61.0 mm (2.4 in) |
| 1978 | 61.0 mm (2.4 in) |
| 1979 | 55.9 mm (2.2 in) |
| 1980 | 64.8 mm (2.6 in) |
| 1981 | 77.0 mm (3.0 in) |
| 1982 | 63.5 mm (2.5 in) |
| 1983 | 52.3 mm (2.1 in) |
| 1984 | 80.0 mm (3.1 in) |
| 1985 | 62.2 mm (2.4 in) |
| 1986 | 68.6 mm (2.7 in) |
| 1987 | 67.3 mm (2.6 in) |
| 1988 | 57.9 mm (2.3 in) |
| 1989 | 82.0 mm (3.2 in) |
| 1990 | 67.1 mm (2.6 in) |
| 1991 | 98.0 mm (3.9 in) |
| 1992 | 84.3 mm (3.3 in) |
| 1993 | 82.3 mm (3.2 in) |
| 1994 | 66.5 mm (2.6 in) |
| 1995 | 59.2 mm (2.3 in) |
| 1996 | 84.1 mm (3.3 in) |
| 1997 | 80.8 mm (3.2 in) |
| 1998 | 118.4 mm (4.7 in) |
| 1999 | 50.8 mm (2.0 in) |
| 2000 | 97.8 mm (3.9 in) |
| 2001 | 74.9 mm (2.9 in) |
| 2002 | 94.0 mm (3.7 in) |
| 2006 | 64.8 mm (2.6 in) |
| 2008 | 74.9 mm (2.9 in) |
| 2009 | 61.0 mm (2.4 in) |
| 2010 | 78.0 mm (3.1 in) |
| 2011 | 80.8 mm (3.2 in) |
| 2012 | 75.9 mm (3.0 in) |
| 2013 | 31.8 mm (1.3 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1972 | 142.8 mm (5.6 in) |
| 1973 | 265.5 mm (10.5 in) |
| 1974 | 159.3 mm (6.3 in) |
| 1975 | 93.3 mm (3.7 in) |
| 1976 | 174.3 mm (6.9 in) |
| 1977 | 115.6 mm (4.6 in) |
| 1978 | 141.7 mm (5.6 in) |
| 1979 | 107.5 mm (4.2 in) |
| 1980 | 149.6 mm (5.9 in) |
| 1981 | 127.3 mm (5.0 in) |
| 1982 | 115.3 mm (4.5 in) |
| 1983 | 110.1 mm (4.3 in) |
| 1984 | 143.2 mm (5.6 in) |
| 1985 | 142.6 mm (5.6 in) |
| 1986 | 114.0 mm (4.5 in) |
| 1987 | 126.9 mm (5.0 in) |
| 1988 | 118.2 mm (4.7 in) |
| 1989 | 171.5 mm (6.8 in) |
| 1990 | 110.9 mm (4.4 in) |
| 1991 | 156.5 mm (6.2 in) |
| 1992 | 138.9 mm (5.5 in) |
| 1993 | 152.2 mm (6.0 in) |
| 1994 | 92.9 mm (3.7 in) |
| 1995 | 117.1 mm (4.6 in) |
| 1996 | 164.4 mm (6.5 in) |
| 1997 | 181.7 mm (7.2 in) |
| 1998 | 199.4 mm (7.9 in) |
| 1999 | 101.4 mm (4.0 in) |
| 2000 | 109.0 mm (4.3 in) |
| 2001 | 258.9 mm (10.2 in) |
| 2002 | 183.7 mm (7.2 in) |
| 2006 | 91.3 mm (3.6 in) |
| 2008 | 129.1 mm (5.1 in) |
| 2009 | 89.8 mm (3.5 in) |
| 2010 | 159.8 mm (6.3 in) |
| 2011 | 140.5 mm (5.5 in) |
| 2012 | 129.6 mm (5.1 in) |
| 2013 | 65.4 mm (2.6 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1972 | 58 days |
| 1973 | 94 days |
| 1974 | 86 days |
| 1975 | 105 days |
| 1976 | 147 days |
| 1977 | 131 days |
| 1978 | 80 days |
| 1979 | 105 days |
| 1980 | 105 days |
| 1981 | 133 days |
| 1982 | 111 days |
| 1983 | 102 days |
| 1984 | 130 days |
| 1985 | 123 days |
| 1986 | 137 days |
| 1987 | 90 days |
| 1988 | 95 days |
| 1989 | 147 days |
| 1990 | 123 days |
| 1991 | 129 days |
| 1992 | 110 days |
| 1993 | 163 days |
| 1994 | 140 days |
| 1995 | 118 days |
| 1996 | 126 days |
| 1997 | 161 days |
| 1998 | 154 days |
| 1999 | 136 days |
| 2000 | 146 days |
| 2001 | 77 days |
| 2002 | 119 days |
| 2006 | 9 days |
| 2008 | 158 days |
| 2009 | 133 days |
| 2010 | 126 days |
| 2011 | 121 days |
| 2012 | 91 days |
| 2013 | 72 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, 1973 to 2012A day with at least 70.7 mm (2.8 in) of rain is expected about once in 2 years. A day with at least 127.1 mm (5.0 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 70.7 mm (2.8 in) | |
| 5 years | 85.0 mm (3.3 in) | |
| 10 years | 94.8 mm (3.7 in) | |
| 25 years | 107.5 mm (4.2 in) | |
| 50 years | 117.2 mm (4.6 in) | Longer than the 34 years of record |
| 100 years | 127.1 mm (5.0 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 1973 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: 118.4 mm (4.7 in) in 1998; 114.8 mm (4.5 in) in 1973; 98.0 mm (3.9 in) in 1991.
Download the Data
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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2025-12-31).