Ahualulco de Mercado (Smn) Weather Records (MXN00014269)

Record envelope, standing records and threshold days for Ahualulco de Mercado (Smn) (MXN00014269), Mexico, with 75 years of record.

Key Facts for Ahualulco de Mercado (Smn)

Ahualulco de Mercado (Smn) (MXN00014269) is a weather station in Mexico at 20.70 latitude and -103.97 longitude, 1,340 m (4,396 ft) above sea level.
The station reports from 1938 to 2012, 75 years of record.
1,464 records set at Ahualulco de Mercado (Smn) still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Mexico, 20.70 latitude, -103.97 longitude.
Elevation: 1,340 m (4,396 ft).
Period of record: 1938 to 2012, 75 years.
Eligible elements: none yet.

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 Ahualulco de Mercado (Smn). 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 Ahualulco de Mercado (Smn), with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	35.6 C (96.1 F)	-1.1 C (30.0 F)	n/a	n/a
Feb	35.6 C (96.1 F)	-3.3 C (26.1 F)	n/a	n/a
Mar	40.0 C (104.0 F)	-1.1 C (30.0 F)	n/a	n/a
Apr	46.7 C (116.1 F)	5.0 C (41.0 F)	n/a	n/a
May	46.7 C (116.1 F)	6.7 C (44.1 F)	n/a	n/a
Jun	41.7 C (107.1 F)	5.6 C (42.1 F)	n/a	n/a
Jul	37.8 C (100.0 F)	10.0 C (50.0 F)	n/a	n/a
Aug	36.1 C (97.0 F)	10.0 C (50.0 F)	n/a	n/a
Sep	37.8 C (100.0 F)	6.7 C (44.1 F)	n/a	n/a
Oct	37.8 C (100.0 F)	3.9 C (39.0 F)	n/a	n/a
Nov	37.8 C (100.0 F)	0.6 C (33.1 F)	n/a	n/a
Dec	40.0 C (104.0 F)	0.0 C (32.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Ahualulco de Mercado (Smn) still stand. 1939 holds the most, with 414.

Standing records at Ahualulco de Mercado (Smn) by the year they were set
Year set	Standing records
1938	9
1939	414
1940	61
1945	126
1946	68
1947	78
1948	115
1949	5
1964	44
1965	100
1966	36
1967	16
1968	31
1991	17
1992	36
1993	29
1994	7
1995	33
1996	4
1997	26
1998	13
1999	19
2000	17
2001	8
2002	24
2003	18
2004	20
2005	18
2006	11
2007	6
2008	3
2009	4
2010	26
2011	20
2012	2

Wettest Day of Each Month

Aug: 80.3 mm (3.2 in)

The wettest day on record for each calendar month at Ahualulco de Mercado (Smn). The most was 80.3 mm (3.2 in) on 2 August 2006.

Record daily precipitation for each month at Ahualulco de Mercado (Smn)
Month	Record daily precipitation (mm)	Date
Jan	63.0 mm (2.5 in)	24 January 1992
Feb	73.9 mm (2.9 in)	2 February 2010
Mar	54.9 mm (2.2 in)	4 March 1968
Apr	26.4 mm (1.0 in)	28 April 1965
May	30.0 mm (1.2 in)	24 May 1968
Jun	74.9 mm (2.9 in)	22 June 1993
Jul	73.9 mm (2.9 in)	1 July 2005
Aug	80.3 mm (3.2 in)	2 August 2006
Sep	58.9 mm (2.3 in)	16 September 2004
Oct	41.4 mm (1.6 in)	9 October 1992
Nov	24.9 mm (1.0 in)	17 November 1967
Dec	38.9 mm (1.5 in)	15 December 1965

Period of Record Coverage

1938 to 2012

35 years of record at Ahualulco de Mercado (Smn), 1938 to 2012. 10 years have data for under 90 percent of days and are left out of rankings: 1938, 1940, 1946, 1948, 1949, 1964, 1965, 1967 and others.

Days with data per year at Ahualulco de Mercado (Smn)
Year	Days with data	Share of year	Complete
1938	31	8%	No
1939	362	99%	Yes
1940	83	23%	No
1945	361	99%	Yes
1946	150	41%	No
1947	332	91%	Yes
1948	301	82%	No
1949	31	8%	No
1964	107	29%	No
1965	288	79%	No
1966	363	99%	Yes
1967	272	75%	No
1968	361	99%	Yes
1991	302	83%	No
1992	364	99%	Yes
1993	331	91%	Yes
1994	363	99%	Yes
1995	362	99%	Yes
1996	366	100%	Yes
1997	364	100%	Yes
1998	359	98%	Yes
1999	364	100%	Yes
2000	366	100%	Yes
2001	365	100%	Yes
2002	363	99%	Yes
2003	364	100%	Yes
2004	366	100%	Yes
2005	365	100%	Yes
2006	364	100%	Yes
2007	365	100%	Yes
2008	366	100%	Yes
2009	335	92%	Yes
2010	365	100%	Yes
2011	365	100%	Yes
2012	31	8%	No

Latest Records

No records were set at this station in the latest data.

Climate Trend

21 complete years, 1939 to 2011

One stripe for each of 21 complete years at Ahualulco de Mercado (Smn), 1939 to 2011. Blue stripes are years cooler than the station's own mean of 20.8 C (69.5 F); red stripes are warmer. The coolest year was 1966, at 20.1 C (68.1 F), and the warmest was 1945, at 22.9 C (73.2 F). The strongest colour marks a difference of 2.1 C (3.8 F).

Annual mean temperature at Ahualulco de Mercado (Smn) as warming stripes, 1939 to 2011
Year	Annual mean temperature	Difference from the station mean
1939	20.5 C	-0.39 C
1945	22.9 C	+2.03 C
1966	20.1 C	-0.78 C
1992	20.5 C	-0.30 C
1994	20.9 C	+0.03 C
1995	20.8 C	-0.02 C
1996	20.5 C	-0.32 C
1997	20.1 C	-0.71 C
1998	21.0 C	+0.18 C
1999	20.7 C	-0.12 C
2000	20.8 C	-0.05 C
2001	20.9 C	+0.07 C
2002	21.2 C	+0.32 C
2003	21.5 C	+0.61 C
2004	20.7 C	-0.12 C
2005	21.2 C	+0.36 C
2006	20.7 C	-0.18 C
2007	20.8 C	-0.09 C
2008	20.5 C	-0.30 C
2010	20.2 C	-0.61 C
2011	21.3 C	+0.48 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

1938 to 2012

Yearly extremes at Ahualulco de Mercado (Smn): the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	46.7 C (116.1 F)	1946	37.2 C (99.0 F)	35
Coldest night (TNn)	-3.3 C (26.1 F)	2003	2.2 C (36.0 F)	35
Wettest day (Rx1day)	80.3 mm (3.2 in)	2006	47.8 mm (1.9 in)	35
Wettest five days (Rx5day)	179.5 mm (7.1 in)	1993	96.1 mm (3.8 in)	35
Longest dry spell (CDD)	160 days	1998	106 days	35

Hottest day (TXx)

The hottest day of the year at Ahualulco de Mercado (Smn), 1938 to 2012. The record is 46.7 C (116.1 F) in 1946, marked on the chart; the median year is 37.2 C (99.0 F).

Hottest day (TXx) at Ahualulco de Mercado (Smn) by year
Year	Hottest day (TXx)
1938	21.7 C (71.1 F)
1939	29.4 C (84.9 F)
1940	28.9 C (84.0 F)
1945	41.7 C (107.1 F)
1946	46.7 C (116.1 F)
1947	38.9 C (102.0 F)
1948	46.7 C (116.1 F)
1949	32.8 C (91.0 F)
1964	23.9 C (75.0 F)
1965	35.6 C (96.1 F)
1966	35.6 C (96.1 F)
1967	39.4 C (102.9 F)
1968	37.2 C (99.0 F)
1991	38.9 C (102.0 F)
1992	37.8 C (100.0 F)
1993	36.7 C (98.1 F)
1994	36.7 C (98.1 F)
1995	38.9 C (102.0 F)
1996	35.6 C (96.1 F)
1997	35.6 C (96.1 F)
1998	37.8 C (100.0 F)
1999	37.8 C (100.0 F)
2000	36.7 C (98.1 F)
2001	37.2 C (99.0 F)
2002	39.4 C (102.9 F)
2003	39.4 C (102.9 F)
2004	37.8 C (100.0 F)
2005	37.8 C (100.0 F)
2006	35.6 C (96.1 F)
2007	37.8 C (100.0 F)
2008	36.7 C (98.1 F)
2009	36.7 C (98.1 F)
2010	38.9 C (102.0 F)
2011	38.9 C (102.0 F)
2012	33.9 C (93.0 F)

Coldest night (TNn)

The coldest night of the year at Ahualulco de Mercado (Smn), 1938 to 2012. The record is -3.3 C (26.1 F) in 2003, marked on the chart; the median year is 2.2 C (36.0 F).

Coldest night (TNn) at Ahualulco de Mercado (Smn) by year
Year	Coldest night (TNn)
1938	8.3 C (46.9 F)
1939	8.9 C (48.0 F)
1940	10.0 C (50.0 F)
1945	3.9 C (39.0 F)
1946	2.8 C (37.0 F)
1947	3.9 C (39.0 F)
1948	3.9 C (39.0 F)
1949	5.0 C (41.0 F)
1964	3.9 C (39.0 F)
1965	2.2 C (36.0 F)
1966	2.8 C (37.0 F)
1967	0.0 C (32.0 F)
1968	2.8 C (37.0 F)
1991	0.6 C (33.1 F)
1992	0.6 C (33.1 F)
1993	-1.1 C (30.0 F)
1994	1.7 C (35.1 F)
1995	0.6 C (33.1 F)
1996	1.7 C (35.1 F)
1997	-1.1 C (30.0 F)
1998	-0.6 C (30.9 F)
1999	0.6 C (33.1 F)
2000	2.2 C (36.0 F)
2001	2.8 C (37.0 F)
2002	0.6 C (33.1 F)
2003	-3.3 C (26.1 F)
2004	0.0 C (32.0 F)
2005	2.8 C (37.0 F)
2006	0.6 C (33.1 F)
2007	2.8 C (37.0 F)
2008	1.7 C (35.1 F)
2009	3.9 C (39.0 F)
2010	0.0 C (32.0 F)
2011	0.0 C (32.0 F)
2012	3.9 C (39.0 F)

Wettest day (Rx1day)

The wettest day of the year at Ahualulco de Mercado (Smn), 1938 to 2012. The record is 80.3 mm (3.2 in) in 2006, marked on the chart; the median year is 47.8 mm (1.9 in).

Wettest day (Rx1day) at Ahualulco de Mercado (Smn) by year
Year	Wettest day (Rx1day)
1938	2.3 mm (0.09 in)
1939	52.1 mm (2.1 in)
1940	21.8 mm (0.9 in)
1945	46.0 mm (1.8 in)
1946	17.8 mm (0.7 in)
1947	34.3 mm (1.4 in)
1948	41.9 mm (1.6 in)
1949	0.0 mm (0.00 in)
1964	37.3 mm (1.5 in)
1965	47.8 mm (1.9 in)
1966	40.4 mm (1.6 in)
1967	30.0 mm (1.2 in)
1968	54.9 mm (2.2 in)
1991	40.9 mm (1.6 in)
1992	63.0 mm (2.5 in)
1993	74.9 mm (2.9 in)
1994	41.9 mm (1.6 in)
1995	39.9 mm (1.6 in)
1996	53.6 mm (2.1 in)
1997	54.9 mm (2.2 in)
1998	59.9 mm (2.4 in)
1999	49.8 mm (2.0 in)
2000	49.3 mm (1.9 in)
2001	52.8 mm (2.1 in)
2002	49.8 mm (2.0 in)
2003	50.3 mm (2.0 in)
2004	70.9 mm (2.8 in)
2005	73.9 mm (2.9 in)
2006	80.3 mm (3.2 in)
2007	40.9 mm (1.6 in)
2008	54.9 mm (2.2 in)
2009	46.0 mm (1.8 in)
2010	73.9 mm (2.9 in)
2011	47.8 mm (1.9 in)
2012	0.0 mm (0.00 in)

Wettest five days (Rx5day)

The wettest five days of the year at Ahualulco de Mercado (Smn), 1938 to 2012. The record is 179.5 mm (7.1 in) in 1993, marked on the chart; the median year is 96.1 mm (3.8 in).

Wettest five days (Rx5day) at Ahualulco de Mercado (Smn) by year
Year	Wettest five days (Rx5day)
1938	2.3 mm (0.09 in)
1939	114.2 mm (4.5 in)
1940	23.6 mm (0.9 in)
1945	90.8 mm (3.6 in)
1946	25.7 mm (1.0 in)
1947	73.5 mm (2.9 in)
1948	112.3 mm (4.4 in)
1949	0.0 mm (0.00 in)
1964	61.0 mm (2.4 in)
1965	104.7 mm (4.1 in)
1966	92.7 mm (3.6 in)
1967	80.3 mm (3.2 in)
1968	160.6 mm (6.3 in)
1991	95.0 mm (3.7 in)
1992	126.0 mm (5.0 in)
1993	179.5 mm (7.1 in)
1994	96.1 mm (3.8 in)
1995	85.5 mm (3.4 in)
1996	88.4 mm (3.5 in)
1997	97.5 mm (3.8 in)
1998	116.4 mm (4.6 in)
1999	120.4 mm (4.7 in)
2000	98.6 mm (3.9 in)
2001	92.0 mm (3.6 in)
2002	101.4 mm (4.0 in)
2003	86.1 mm (3.4 in)
2004	165.4 mm (6.5 in)
2005	120.2 mm (4.7 in)
2006	109.3 mm (4.3 in)
2007	77.3 mm (3.0 in)
2008	113.5 mm (4.5 in)
2009	89.5 mm (3.5 in)
2010	131.3 mm (5.2 in)
2011	118.6 mm (4.7 in)
2012	0.0 mm (0.00 in)

Longest dry spell (CDD)

The longest dry spell of the year at Ahualulco de Mercado (Smn), 1938 to 2012. The record is 160 days in 1998, marked on the chart; the median year is 106 days.

Longest dry spell (CDD) at Ahualulco de Mercado (Smn) by year
Year	Longest dry spell (CDD)
1938	23 days
1939	135 days
1940	44 days
1945	118 days
1946	47 days
1947	140 days
1948	106 days
1949	31 days
1964	25 days
1965	66 days
1966	52 days
1967	126 days
1968	54 days
1991	55 days
1992	78 days
1993	132 days
1994	147 days
1995	144 days
1996	136 days
1997	50 days
1998	160 days
1999	137 days
2000	148 days
2001	81 days
2002	88 days
2003	130 days
2004	110 days
2005	116 days
2006	144 days
2007	111 days
2008	103 days
2009	62 days
2010	114 days
2011	105 days
2012	31 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.

Download the Data

Data for Ahualulco de Mercado (Smn) standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Ahualulco de Mercado (Smn) 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).