El Tajo -Tunel Viejo- Weather Records (MXN00015028)

Record envelope, standing records and threshold days for El Tajo -Tunel Viejo- (MXN00015028), Mexico, with 52 years of record.

Key Facts for El Tajo -Tunel Viejo-

El Tajo -Tunel Viejo- (MXN00015028) is a weather station in Mexico at 19.90 latitude and -99.12 longitude, 2,229 m (7,312 ft) above sea level.
The station reports from 1961 to 2012, 52 years of record.
1,464 records set at El Tajo -Tunel Viejo- still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
El Tajo -Tunel Viejo- tied a daily record high maximum temperature of 25.0 C (77.0 F) on 27 December 2012.

About the Station

Location: Mexico, 19.90 latitude, -99.12 longitude.
Elevation: 2,229 m (7,312 ft).
Period of record: 1961 to 2012, 52 years.
Eligible elements: tmax, tmin, prcp.

Daily Record Envelope and 2026

0 days at or beyond a record

The band shows the record high and record low for each calendar day at El Tajo -Tunel Viejo-. 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 El Tajo -Tunel Viejo-, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	30.0 C (86.0 F)	-10.0 C (14.0 F)	n/a	n/a
Feb	30.0 C (86.0 F)	-9.4 C (15.1 F)	n/a	n/a
Mar	33.9 C (93.0 F)	-7.2 C (19.0 F)	n/a	n/a
Apr	35.6 C (96.1 F)	-3.3 C (26.1 F)	n/a	n/a
May	35.0 C (95.0 F)	0.6 C (33.1 F)	n/a	n/a
Jun	33.3 C (91.9 F)	0.0 C (32.0 F)	n/a	n/a
Jul	28.9 C (84.0 F)	1.7 C (35.1 F)	n/a	n/a
Aug	30.6 C (87.1 F)	3.9 C (39.0 F)	n/a	n/a
Sep	30.0 C (86.0 F)	-2.2 C (28.0 F)	n/a	n/a
Oct	30.0 C (86.0 F)	-3.3 C (26.1 F)	n/a	n/a
Nov	29.4 C (84.9 F)	-9.4 C (15.1 F)	n/a	n/a
Dec	28.9 C (84.0 F)	-7.2 C (19.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at El Tajo -Tunel Viejo- still stand. 1969 holds the most, with 95.

Standing records at El Tajo -Tunel Viejo- by the year they were set
Year set	Standing records
1967	49
1968	49
1969	95
1970	53
1971	38
1972	62
1973	87
1974	47
1975	36
1976	55
1977	46
1978	40
1979	50
1980	43
1981	37
1982	45
1983	60
1984	31
1985	32
1986	40
1987	42
1988	32
1996	70
1998	2
2001	27
2002	24
2003	35
2005	25
2006	30
2007	23
2008	28
2009	42
2010	31
2011	27
2012	31

All-Time Record Progression

1 new records

1 all-time records were set at El Tajo -Tunel Viejo- between 6 September 2002 and 6 September 2002. Each dot is a new record.

Wettest Day of Each Month

Sep: 69.9 mm (2.8 in)

The wettest day on record for each calendar month at El Tajo -Tunel Viejo-. The most was 69.9 mm (2.8 in) on 6 September 2002.

Record daily precipitation for each month at El Tajo -Tunel Viejo-
Month	Record daily precipitation (mm)	Date
Jan	26.9 mm (1.1 in)	17 January 1981
Feb	29.0 mm (1.1 in)	3 February 2010
Mar	37.8 mm (1.5 in)	9 March 1966
Apr	55.9 mm (2.2 in)	28 April 1965
May	53.8 mm (2.1 in)	19 May 1968
Jun	63.0 mm (2.5 in)	4 June 1985
Jul	52.3 mm (2.1 in)	19 July 1977
Aug	67.8 mm (2.7 in)	22 August 2007
Sep	69.9 mm (2.8 in)	6 September 2002
Oct	66.0 mm (2.6 in)	11 October 1982
Nov	41.1 mm (1.6 in)	5 November 2002
Dec	13.0 mm (0.5 in)	9 December 1978

Period of Record Coverage

1967 to 2012

35 years of record at El Tajo -Tunel Viejo-, 1967 to 2012. 6 years have data for under 90 percent of days and are left out of rankings: 1967, 1998, 2002, 2005, 2006, 2010.

Days with data per year at El Tajo -Tunel Viejo-
Year	Days with data	Share of year	Complete
1967	293	80%	No
1968	365	100%	Yes
1969	365	100%	Yes
1970	365	100%	Yes
1971	365	100%	Yes
1972	366	100%	Yes
1973	365	100%	Yes
1974	365	100%	Yes
1975	365	100%	Yes
1976	365	100%	Yes
1977	364	100%	Yes
1978	364	100%	Yes
1979	333	91%	Yes
1980	366	100%	Yes
1981	363	99%	Yes
1982	364	100%	Yes
1983	365	100%	Yes
1984	366	100%	Yes
1985	365	100%	Yes
1986	365	100%	Yes
1987	365	100%	Yes
1988	366	100%	Yes
1996	333	91%	Yes
1998	3	1%	No
2001	358	98%	Yes
2002	323	88%	No
2003	333	91%	Yes
2005	304	83%	No
2006	237	65%	No
2007	332	91%	Yes
2008	357	98%	Yes
2009	360	99%	Yes
2010	273	75%	No
2011	365	100%	Yes
2012	366	100%	Yes

Latest Records

Latest records at El Tajo -Tunel Viejo-
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
27 December 2012	El Tajo -Tunel Viejo-, MX	daily high max (Tie)	25.0 C (77.0 F)	tie	43 years	4 of 100 (Routine)
19 December 2012	El Tajo -Tunel Viejo-, MX	daily high max	25.6 C (78.1 F)	0.6 C (1.1 F)	42 years	18 of 100 (Routine)
16 December 2012	El Tajo -Tunel Viejo-, MX	daily high max (Tie)	25.6 C (78.1 F)	tie	25 years	2 of 100 (Routine)
23 November 2012	El Tajo -Tunel Viejo-, MX	daily low max (Tie)	18.9 C (66.0 F)	tie	32 years	3 of 100 (Routine)
20 November 2012	El Tajo -Tunel Viejo-, MX	daily high max	27.8 C (82.0 F)	2.2 C (4.0 F)	35 years	21 of 100 (Routine)
17 November 2012	El Tajo -Tunel Viejo-, MX	daily low max	17.8 C (64.0 F)	2.2 C (4.0 F)	35 years	21 of 100 (Routine)
15 November 2012	El Tajo -Tunel Viejo-, MX	daily high min (Tie)	6.7 C (44.1 F)	tie	26 years	2 of 100 (Routine)
14 November 2012	El Tajo -Tunel Viejo-, MX	daily high min	10.0 C (50.0 F)	0.6 C (1.1 F)	40 years	17 of 100 (Routine)
6 November 2012	El Tajo -Tunel Viejo-, MX	daily high min	10.6 C (51.1 F)	0.6 C (1.1 F)	29 years	13 of 100 (Routine)
5 November 2012	El Tajo -Tunel Viejo-, MX	daily high min (Tie)	10.0 C (50.0 F)	tie	10 years	1 of 100 (Routine)
7 October 2012	El Tajo -Tunel Viejo-, MX	daily low min (Tie)	0.0 C (32.0 F)	tie	33 years	3 of 100 (Routine)
6 October 2012	El Tajo -Tunel Viejo-, MX	daily low min	-1.1 C (30.0 F)	1.7 C (3.1 F)	33 years	18 of 100 (Routine)
5 October 2012	El Tajo -Tunel Viejo-, MX	daily low min	-2.2 C (28.0 F)	2.8 C (5.0 F)	10 years	15 of 100 (Routine)
4 October 2012	El Tajo -Tunel Viejo-, MX	daily low min	-2.2 C (28.0 F)	2.2 C (4.0 F)	33 years	19 of 100 (Routine)
28 September 2012	El Tajo -Tunel Viejo-, MX	daily high max (Tie)	27.8 C (82.0 F)	tie	30 years	3 of 100 (Routine)
22 September 2012	El Tajo -Tunel Viejo-, MX	daily low min (Tie)	5.0 C (41.0 F)	tie	7 years	1 of 100 (Routine)
21 September 2012	El Tajo -Tunel Viejo-, MX	daily low min	5.0 C (41.0 F)	0.6 C (1.1 F)	35 years	16 of 100 (Routine)
20 September 2012	El Tajo -Tunel Viejo-, MX	daily low min (Tie)	5.0 C (41.0 F)	tie	37 years	3 of 100 (Routine)
19 September 2012	El Tajo -Tunel Viejo-, MX	daily low min (Tie)	3.9 C (39.0 F)	tie	32 years	3 of 100 (Routine)
5 September 2012	El Tajo -Tunel Viejo-, MX	daily low min	5.0 C (41.0 F)	0.6 C (1.1 F)	27 years	14 of 100 (Routine)

Climate Trend

25 complete years, 1968 to 2012

One stripe for each of 25 complete years at El Tajo -Tunel Viejo-, 1968 to 2012. Blue stripes are years cooler than the station's own mean of 15.2 C (59.3 F); red stripes are warmer. The coolest year was 2008, at 14.7 C (58.5 F), and the warmest was 1973, at 16.0 C (60.7 F). The strongest colour marks a difference of 0.8 C (1.4 F).

Annual mean temperature at El Tajo -Tunel Viejo- as warming stripes, 1968 to 2012
Year	Annual mean temperature	Difference from the station mean
1968	14.8 C	-0.39 C
1969	15.8 C	+0.61 C
1970	15.3 C	+0.08 C
1971	15.1 C	-0.05 C
1972	15.6 C	+0.44 C
1973	16.0 C	+0.78 C
1974	15.2 C	+0.00 C
1975	15.0 C	-0.18 C
1976	14.8 C	-0.37 C
1977	15.2 C	-0.03 C
1978	15.3 C	+0.09 C
1980	15.5 C	+0.33 C
1981	15.2 C	-0.02 C
1982	15.5 C	+0.35 C
1983	15.2 C	-0.02 C
1984	15.0 C	-0.15 C
1985	14.9 C	-0.32 C
1986	14.8 C	-0.40 C
1987	14.9 C	-0.26 C
1988	15.0 C	-0.16 C
2001	15.0 C	-0.21 C
2008	14.7 C	-0.47 C
2009	15.5 C	+0.36 C
2011	15.4 C	+0.22 C
2012	14.9 C	-0.30 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

1961 to 2012

Yearly extremes at El Tajo -Tunel Viejo-: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	35.6 C (96.1 F)	1975	32.8 C (91.0 F)	35
Coldest night (TNn)	-10.0 C (14.0 F)	1986	-4.4 C (24.1 F)	35
Wettest day (Rx1day)	69.9 mm (2.8 in)	2002	47.5 mm (1.9 in)	43
Wettest five days (Rx5day)	138.4 mm (5.4 in)	1969	85.7 mm (3.4 in)	43
Longest dry spell (CDD)	109 days	1987	58 days	43

Hottest day (TXx)

The hottest day of the year at El Tajo -Tunel Viejo-, 1961 to 2012. The record is 35.6 C (96.1 F) in 1975, marked on the chart; the median year is 32.8 C (91.0 F).

Hottest day (TXx) at El Tajo -Tunel Viejo- by year
Year	Hottest day (TXx)
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	32.8 C (91.0 F)
1968	31.1 C (88.0 F)
1969	33.3 C (91.9 F)
1970	34.4 C (93.9 F)
1971	33.9 C (93.0 F)
1972	31.7 C (89.1 F)
1973	35.0 C (95.0 F)
1974	33.9 C (93.0 F)
1975	35.6 C (96.1 F)
1976	30.6 C (87.1 F)
1977	33.3 C (91.9 F)
1978	32.2 C (90.0 F)
1979	31.1 C (88.0 F)
1980	31.7 C (89.1 F)
1981	31.7 C (89.1 F)
1982	32.2 C (90.0 F)
1983	35.0 C (95.0 F)
1984	33.9 C (93.0 F)
1985	31.7 C (89.1 F)
1986	32.8 C (91.0 F)
1987	30.6 C (87.1 F)
1988	32.8 C (91.0 F)
1996	32.8 C (91.0 F)
1997	n/a
1998	33.9 C (93.0 F)
1999	n/a
2001	32.8 C (91.0 F)
2002	32.8 C (91.0 F)
2003	33.9 C (93.0 F)
2005	32.8 C (91.0 F)
2006	27.8 C (82.0 F)
2007	32.8 C (91.0 F)
2008	32.8 C (91.0 F)
2009	33.9 C (93.0 F)
2010	32.8 C (91.0 F)
2011	33.9 C (93.0 F)
2012	31.7 C (89.1 F)

Coldest night (TNn)

The coldest night of the year at El Tajo -Tunel Viejo-, 1961 to 2012. The record is -10.0 C (14.0 F) in 1986, marked on the chart; the median year is -4.4 C (24.1 F).

Coldest night (TNn) at El Tajo -Tunel Viejo- by year
Year	Coldest night (TNn)
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	-2.2 C (28.0 F)
1968	-3.3 C (26.1 F)
1969	-2.8 C (27.0 F)
1970	-5.0 C (23.0 F)
1971	-4.4 C (24.1 F)
1972	-5.0 C (23.0 F)
1973	-6.1 C (21.0 F)
1974	-5.0 C (23.0 F)
1975	-6.1 C (21.0 F)
1976	-9.4 C (15.1 F)
1977	-2.2 C (28.0 F)
1978	-0.6 C (30.9 F)
1979	-5.0 C (23.0 F)
1980	-4.4 C (24.1 F)
1981	-4.4 C (24.1 F)
1982	-4.4 C (24.1 F)
1983	-5.0 C (23.0 F)
1984	-4.4 C (24.1 F)
1985	-4.4 C (24.1 F)
1986	-10.0 C (14.0 F)
1987	-7.2 C (19.0 F)
1988	-10.0 C (14.0 F)
1996	-9.4 C (15.1 F)
1997	n/a
1998	1.7 C (35.1 F)
1999	n/a
2001	-3.3 C (26.1 F)
2002	-4.4 C (24.1 F)
2003	-7.2 C (19.0 F)
2005	-1.1 C (30.0 F)
2006	-7.2 C (19.0 F)
2007	-2.2 C (28.0 F)
2008	-6.1 C (21.0 F)
2009	-4.4 C (24.1 F)
2010	-6.1 C (21.0 F)
2011	-6.1 C (21.0 F)
2012	-3.3 C (26.1 F)

Wettest day (Rx1day)

The wettest day of the year at El Tajo -Tunel Viejo-, 1961 to 2012. The record is 69.9 mm (2.8 in) in 2002, marked on the chart; the median year is 47.5 mm (1.9 in).

Wettest day (Rx1day) at El Tajo -Tunel Viejo- by year
Year	Wettest day (Rx1day)
1961	30.0 mm (1.2 in)
1962	49.8 mm (2.0 in)
1963	49.8 mm (2.0 in)
1964	39.9 mm (1.6 in)
1965	55.9 mm (2.2 in)
1966	59.9 mm (2.4 in)
1967	45.0 mm (1.8 in)
1968	53.8 mm (2.1 in)
1969	39.9 mm (1.6 in)
1970	47.0 mm (1.9 in)
1971	38.4 mm (1.5 in)
1972	41.9 mm (1.6 in)
1973	56.9 mm (2.2 in)
1974	49.8 mm (2.0 in)
1975	45.0 mm (1.8 in)
1976	62.0 mm (2.4 in)
1977	52.3 mm (2.1 in)
1978	40.9 mm (1.6 in)
1979	27.9 mm (1.1 in)
1980	50.8 mm (2.0 in)
1981	47.5 mm (1.9 in)
1982	66.0 mm (2.6 in)
1983	42.9 mm (1.7 in)
1984	33.8 mm (1.3 in)
1985	63.0 mm (2.5 in)
1986	45.0 mm (1.8 in)
1987	46.0 mm (1.8 in)
1988	52.3 mm (2.1 in)
1996	48.3 mm (1.9 in)
1997	31.0 mm (1.2 in)
1998	32.8 mm (1.3 in)
1999	34.8 mm (1.4 in)
2001	32.3 mm (1.3 in)
2002	69.9 mm (2.8 in)
2003	50.8 mm (2.0 in)
2005	28.4 mm (1.1 in)
2006	34.3 mm (1.4 in)
2007	67.8 mm (2.7 in)
2008	52.8 mm (2.1 in)
2009	65.8 mm (2.6 in)
2010	47.8 mm (1.9 in)
2011	48.8 mm (1.9 in)
2012	39.9 mm (1.6 in)

Wettest five days (Rx5day)

The wettest five days of the year at El Tajo -Tunel Viejo-, 1961 to 2012. The record is 138.4 mm (5.4 in) in 1969, marked on the chart; the median year is 85.7 mm (3.4 in).

Wettest five days (Rx5day) at El Tajo -Tunel Viejo- by year
Year	Wettest five days (Rx5day)
1961	80.4 mm (3.2 in)
1962	93.5 mm (3.7 in)
1963	98.6 mm (3.9 in)
1964	107.2 mm (4.2 in)
1965	109.5 mm (4.3 in)
1966	86.4 mm (3.4 in)
1967	104.4 mm (4.1 in)
1968	98.4 mm (3.9 in)
1969	138.4 mm (5.4 in)
1970	90.2 mm (3.6 in)
1971	76.8 mm (3.0 in)
1972	69.1 mm (2.7 in)
1973	91.0 mm (3.6 in)
1974	116.1 mm (4.6 in)
1975	80.6 mm (3.2 in)
1976	92.7 mm (3.6 in)
1977	75.5 mm (3.0 in)
1978	71.9 mm (2.8 in)
1979	67.9 mm (2.7 in)
1980	80.8 mm (3.2 in)
1981	89.6 mm (3.5 in)
1982	86.8 mm (3.4 in)
1983	67.9 mm (2.7 in)
1984	120.6 mm (4.7 in)
1985	87.2 mm (3.4 in)
1986	70.1 mm (2.8 in)
1987	60.5 mm (2.4 in)
1988	105.5 mm (4.2 in)
1996	77.8 mm (3.1 in)
1997	78.8 mm (3.1 in)
1998	69.6 mm (2.7 in)
1999	76.0 mm (3.0 in)
2001	73.2 mm (2.9 in)
2002	94.6 mm (3.7 in)
2003	89.9 mm (3.5 in)
2005	39.8 mm (1.6 in)
2006	58.0 mm (2.3 in)
2007	83.1 mm (3.3 in)
2008	112.8 mm (4.4 in)
2009	85.7 mm (3.4 in)
2010	70.4 mm (2.8 in)
2011	121.5 mm (4.8 in)
2012	58.1 mm (2.3 in)

Longest dry spell (CDD)

The longest dry spell of the year at El Tajo -Tunel Viejo-, 1961 to 2012. The record is 109 days in 1987, marked on the chart; the median year is 58 days.

Longest dry spell (CDD) at El Tajo -Tunel Viejo- by year
Year	Longest dry spell (CDD)
1961	27 days
1962	77 days
1963	59 days
1964	46 days
1965	48 days
1966	49 days
1967	24 days
1968	43 days
1969	72 days
1970	80 days
1971	66 days
1972	58 days
1973	92 days
1974	36 days
1975	65 days
1976	74 days
1977	61 days
1978	26 days
1979	63 days
1980	36 days
1981	61 days
1982	46 days
1983	68 days
1984	51 days
1985	39 days
1986	103 days
1987	109 days
1988	61 days
1996	106 days
1997	45 days
1998	55 days
1999	63 days
2001	78 days
2002	47 days
2003	82 days
2005	50 days
2006	48 days
2007	36 days
2008	77 days
2009	62 days
2010	47 days
2011	56 days
2012	57 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.

Frost Dates and Growing Season

23 years with a frost

Across 23 years with a frost, the median last spring frost at El Tajo -Tunel Viejo- falls on 27 March and the median first autumn frost on 2 November, which leaves a median of 215 days between them.

Frost dates and growing season at El Tajo -Tunel Viejo-
Measure	Median, all years	Earliest period	Recent period (1968 to 2012)	Recent against earliest	Fitted trend
Last spring frost	27 March	n/a	27 March	n/a	n/a
First autumn frost	2 November	n/a	2 November	n/a	n/a
Growing days	215 days	n/a	215 days	n/a	n/a

A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.

Rainfall Return Levels

36 years, 1962 to 2012

A day with at least 48.1 mm (1.9 in) of rain is expected about once in 2 years. A day with at least 71.4 mm (2.8 in) of rain is expected about once in 100 years.

Rainfall return levels at El Tajo -Tunel Viejo-: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	48.1 mm (1.9 in)
5 years	57.0 mm (2.2 in)
10 years	61.6 mm (2.4 in)
25 years	66.3 mm (2.6 in)
50 years	69.1 mm (2.7 in)	Longer than the 36 years of record
100 years	71.4 mm (2.8 in)	Longer than the 36 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, 36 years of values from 1962 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: 67.8 mm (2.7 in) in 2007; 66.0 mm (2.6 in) in 1982; 65.8 mm (2.6 in) in 2009.

Download the Data

Data for El Tajo -Tunel Viejo- standing records by year: CSV or JSON. Field meanings are on the data page.
Data for El Tajo -Tunel Viejo- 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 2026-10-17 (17 October 2026). Records are computed by this site and are not official.

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