San Juan Acazuchitlan Weather Records (MXN00015217)

Record envelope, standing records and threshold days for San Juan Acazuchitlan (MXN00015217), Mexico, with 35 years of record.

Key Facts for San Juan Acazuchitlan

San Juan Acazuchitlan (MXN00015217) is a weather station in Mexico at 20.13 latitude and -99.60 longitude, 2,605 m (8,546 ft) above sea level.
The station reports from 1975 to 2009, 35 years of record.
1,464 records set at San Juan Acazuchitlan still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
San Juan Acazuchitlan tied a daily record low minimum temperature of 6.7 C (44.1 F) on 22 May 2009.

About the Station

Location: Mexico, 20.13 latitude, -99.60 longitude.
Elevation: 2,605 m (8,546 ft).
Period of record: 1975 to 2009, 35 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 San Juan Acazuchitlan. 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 Acazuchitlan, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	27.8 C (82.0 F)	-6.1 C (21.0 F)	n/a	n/a
Feb	32.8 C (91.0 F)	-5.0 C (23.0 F)	n/a	n/a
Mar	32.8 C (91.0 F)	-5.0 C (23.0 F)	n/a	n/a
Apr	35.0 C (95.0 F)	1.1 C (34.0 F)	n/a	n/a
May	38.9 C (102.0 F)	5.0 C (41.0 F)	n/a	n/a
Jun	33.9 C (93.0 F)	1.7 C (35.1 F)	n/a	n/a
Jul	30.0 C (86.0 F)	4.4 C (39.9 F)	n/a	n/a
Aug	28.9 C (84.0 F)	1.7 C (35.1 F)	n/a	n/a
Sep	30.0 C (86.0 F)	0.0 C (32.0 F)	n/a	n/a
Oct	27.8 C (82.0 F)	-0.6 C (30.9 F)	n/a	n/a
Nov	30.0 C (86.0 F)	-5.0 C (23.0 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 San Juan Acazuchitlan still stand. 2004 holds the most, with 134.

Standing records at San Juan Acazuchitlan by the year they were set
Year set	Standing records
1975	26
1976	36
1977	52
1978	32
1979	33
1980	27
1981	23
1982	61
1983	49
1984	10
1985	31
1986	39
1987	48
1988	25
1989	29
1990	20
1991	9
1992	19
1993	19
1994	29
1995	51
1996	34
1997	108
1998	100
1999	37
2000	10
2001	32
2002	76
2003	72
2004	134
2005	54
2006	89
2007	30
2008	17
2009	3

All-Time Record Progression

1 new records

1 all-time records were set at San Juan Acazuchitlan between 9 July 2008 and 9 July 2008. Each dot is a new record.

Wettest Day of Each Month

Jul: 97.8 mm (3.9 in)

The wettest day on record for each calendar month at San Juan Acazuchitlan. The most was 97.8 mm (3.9 in) on 9 July 2008.

Record daily precipitation for each month at San Juan Acazuchitlan
Month	Record daily precipitation (mm)	Date
Jan	30.0 mm (1.2 in)	28 January 1992
Feb	30.0 mm (1.2 in)	2 February 1992
Mar	53.8 mm (2.1 in)	17 March 1980
Apr	39.9 mm (1.6 in)	24 April 1986
May	57.7 mm (2.3 in)	25 May 1983
Jun	82.3 mm (3.2 in)	22 June 1978
Jul	97.8 mm (3.9 in)	9 July 2008
Aug	71.9 mm (2.8 in)	4 August 1998
Sep	95.8 mm (3.8 in)	3 September 2001
Oct	67.8 mm (2.7 in)	22 October 2000
Nov	53.8 mm (2.1 in)	14 November 2003
Dec	18.8 mm (0.7 in)	25 December 1991

Period of Record Coverage

1975 to 2009

35 years of record at San Juan Acazuchitlan, 1975 to 2009. 10 years have data for under 90 percent of days and are left out of rankings: 1975, 1984, 1989, 1994, 1996, 1998, 2000, 2004 and others.

Days with data per year at San Juan Acazuchitlan
Year	Days with data	Share of year	Complete
1975	122	33%	No
1976	336	92%	Yes
1977	365	100%	Yes
1978	364	100%	Yes
1979	335	92%	Yes
1980	366	100%	Yes
1981	364	100%	Yes
1982	364	100%	Yes
1983	335	92%	Yes
1984	121	33%	No
1985	364	100%	Yes
1986	365	100%	Yes
1987	365	100%	Yes
1988	365	100%	Yes
1989	289	79%	No
1990	365	100%	Yes
1991	335	92%	Yes
1992	333	91%	Yes
1993	357	98%	Yes
1994	211	58%	No
1995	360	99%	Yes
1996	329	90%	No
1997	360	99%	Yes
1998	327	90%	No
1999	364	100%	Yes
2000	325	89%	No
2001	335	92%	Yes
2002	365	100%	Yes
2003	364	100%	Yes
2004	326	89%	No
2005	361	99%	Yes
2006	344	94%	Yes
2007	354	97%	Yes
2008	315	86%	No
2009	148	41%	No

Latest Records

Latest records at San Juan Acazuchitlan
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
22 May 2009	San Juan Acazuchitlan, MX	daily low min (Tie)	6.7 C (44.1 F)	tie	22 years	2 of 100 (Routine)
16 May 2009	San Juan Acazuchitlan, MX	daily rain	19.8 mm (0.8 in)	10.9 mm (0.4 in)	12 years	18 of 100 (Routine)
16 May 2009	San Juan Acazuchitlan, MX	daily low min	6.7 C (44.1 F)	0.5 C (0.9 F)	22 years	11 of 100 (Routine)
12 May 2009	San Juan Acazuchitlan, MX	daily high max	32.8 C (91.0 F)	1.1 C (2.0 F)	26 years	13 of 100 (Routine)
26 February 2009	San Juan Acazuchitlan, MX	daily high min	10.0 C (50.0 F)	1.1 C (2.0 F)	15 years	11 of 100 (Routine)
25 January 2009	San Juan Acazuchitlan, MX	daily high min (Tie)	8.9 C (48.0 F)	tie	15 years	1 of 100 (Routine)
30 September 2008	San Juan Acazuchitlan, MX	daily high max	28.9 C (84.0 F)	2.2 C (4.0 F)	2 years	9 of 100 (Routine)
29 September 2008	San Juan Acazuchitlan, MX	daily high max	27.8 C (82.0 F)	1.1 C (2.0 F)	26 years	13 of 100 (Routine)
28 September 2008	San Juan Acazuchitlan, MX	daily high max (Tie)	28.9 C (84.0 F)	tie	5 years	1 of 100 (Routine)
27 September 2008	San Juan Acazuchitlan, MX	daily high max	28.9 C (84.0 F)	1.1 C (2.0 F)	33 years	15 of 100 (Routine)
26 September 2008	San Juan Acazuchitlan, MX	daily high max (Tie)	26.7 C (80.1 F)	tie	9 years	1 of 100 (Routine)
18 September 2008	San Juan Acazuchitlan, MX	daily high max	28.9 C (84.0 F)	1.1 C (2.0 F)	11 years	9 of 100 (Routine)
13 September 2008	San Juan Acazuchitlan, MX	daily rain (Tie)	24.9 mm (1.0 in)	tie	18 years	2 of 100 (Routine)
6 September 2008	San Juan Acazuchitlan, MX	daily high max	28.9 C (84.0 F)	1.1 C (2.0 F)	1 year	6 of 100 (Routine)
5 September 2008	San Juan Acazuchitlan, MX	daily high max	27.8 C (82.0 F)	1.1 C (2.0 F)	1 year	6 of 100 (Routine)
4 September 2008	San Juan Acazuchitlan, MX	daily high max	28.9 C (84.0 F)	2.2 C (4.0 F)	1 year	9 of 100 (Routine)
3 September 2008	San Juan Acazuchitlan, MX	daily high max (Tie)	27.8 C (82.0 F)	tie	1 year	0 of 100 (Routine)
2 September 2008	San Juan Acazuchitlan, MX	daily high max (Tie)	26.7 C (80.1 F)	tie	9 years	1 of 100 (Routine)
31 August 2008	San Juan Acazuchitlan, MX	daily high max (Tie)	27.8 C (82.0 F)	tie	1 year	0 of 100 (Routine)
30 August 2008	San Juan Acazuchitlan, MX	monthly high max (Tie)	28.9 C (84.0 F)	tie	2 years	3 of 100 (Routine)

Climate Trend

18 complete years, 1977 to 2007

One stripe for each of 18 complete years at San Juan Acazuchitlan, 1977 to 2007. Blue stripes are years cooler than the station's own mean of 14.9 C (58.8 F); red stripes are warmer. The coolest year was 2005, at 13.1 C (55.6 F), and the warmest was 2003, at 16.8 C (62.2 F). The strongest colour marks a difference of 2.0 C (3.6 F).

Annual mean temperature at San Juan Acazuchitlan as warming stripes, 1977 to 2007
Year	Annual mean temperature	Difference from the station mean
1977	15.0 C	+0.09 C
1978	14.7 C	-0.18 C
1980	15.1 C	+0.21 C
1981	14.9 C	+0.07 C
1982	15.8 C	+0.98 C
1985	14.3 C	-0.57 C
1986	13.8 C	-1.02 C
1987	14.2 C	-0.63 C
1988	14.4 C	-0.47 C
1990	14.3 C	-0.54 C
1993	14.3 C	-0.52 C
1995	14.7 C	-0.18 C
1997	15.3 C	+0.42 C
1999	15.6 C	+0.71 C
2002	16.1 C	+1.24 C
2003	16.8 C	+1.93 C
2005	13.1 C	-1.74 C
2007	15.1 C	+0.26 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

1975 to 2009

Yearly extremes at San Juan Acazuchitlan: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	38.9 C (102.0 F)	1983	30.0 C (86.0 F)	35
Coldest night (TNn)	-7.2 C (19.0 F)	2004	-2.2 C (28.0 F)	35
Wettest day (Rx1day)	97.8 mm (3.9 in)	2008	46.0 mm (1.8 in)	35
Wettest five days (Rx5day)	206.5 mm (8.1 in)	1998	90.2 mm (3.6 in)	35
Longest dry spell (CDD)	120 days	2009	47 days	35

Hottest day (TXx)

The hottest day of the year at San Juan Acazuchitlan, 1975 to 2009. The record is 38.9 C (102.0 F) in 1983, marked on the chart; the median year is 30.0 C (86.0 F).

Hottest day (TXx) at San Juan Acazuchitlan by year
Year	Hottest day (TXx)
1975	27.8 C (82.0 F)
1976	28.9 C (84.0 F)
1977	30.0 C (86.0 F)
1978	30.6 C (87.1 F)
1979	29.4 C (84.9 F)
1980	28.9 C (84.0 F)
1981	29.4 C (84.9 F)
1982	32.2 C (90.0 F)
1983	38.9 C (102.0 F)
1984	31.1 C (88.0 F)
1985	30.0 C (86.0 F)
1986	29.4 C (84.9 F)
1987	27.2 C (81.0 F)
1988	29.4 C (84.9 F)
1989	30.0 C (86.0 F)
1990	28.9 C (84.0 F)
1991	30.0 C (86.0 F)
1992	25.6 C (78.1 F)
1993	30.6 C (87.1 F)
1994	26.1 C (79.0 F)
1995	30.6 C (87.1 F)
1996	26.7 C (80.1 F)
1997	30.0 C (86.0 F)
1998	32.8 C (91.0 F)
1999	33.9 C (93.0 F)
2000	28.9 C (84.0 F)
2001	30.0 C (86.0 F)
2002	28.9 C (84.0 F)
2003	35.0 C (95.0 F)
2004	30.0 C (86.0 F)
2005	30.0 C (86.0 F)
2006	30.0 C (86.0 F)
2007	30.6 C (87.1 F)
2008	33.9 C (93.0 F)
2009	33.9 C (93.0 F)

Coldest night (TNn)

The coldest night of the year at San Juan Acazuchitlan, 1975 to 2009. The record is -7.2 C (19.0 F) in 2004, marked on the chart; the median year is -2.2 C (28.0 F).

Coldest night (TNn) at San Juan Acazuchitlan by year
Year	Coldest night (TNn)
1975	-4.4 C (24.1 F)
1976	-5.0 C (23.0 F)
1977	-2.8 C (27.0 F)
1978	-1.1 C (30.0 F)
1979	0.0 C (32.0 F)
1980	-3.9 C (25.0 F)
1981	0.0 C (32.0 F)
1982	-2.8 C (27.0 F)
1983	-2.8 C (27.0 F)
1984	-1.7 C (28.9 F)
1985	-5.0 C (23.0 F)
1986	-5.0 C (23.0 F)
1987	-5.0 C (23.0 F)
1988	-6.1 C (21.0 F)
1989	-4.4 C (24.1 F)
1990	-2.8 C (27.0 F)
1991	0.0 C (32.0 F)
1992	0.0 C (32.0 F)
1993	0.0 C (32.0 F)
1994	2.2 C (36.0 F)
1995	-1.1 C (30.0 F)
1996	0.6 C (33.1 F)
1997	-2.2 C (28.0 F)
1998	-2.2 C (28.0 F)
1999	-1.1 C (30.0 F)
2000	-1.1 C (30.0 F)
2001	-2.2 C (28.0 F)
2002	-2.8 C (27.0 F)
2003	-2.8 C (27.0 F)
2004	-7.2 C (19.0 F)
2005	-2.2 C (28.0 F)
2006	-5.0 C (23.0 F)
2007	-1.1 C (30.0 F)
2008	1.7 C (35.1 F)
2009	0.6 C (33.1 F)

Wettest day (Rx1day)

The wettest day of the year at San Juan Acazuchitlan, 1975 to 2009. The record is 97.8 mm (3.9 in) in 2008, marked on the chart; the median year is 46.0 mm (1.8 in).

Wettest day (Rx1day) at San Juan Acazuchitlan by year
Year	Wettest day (Rx1day)
1975	2.8 mm (0.11 in)
1976	39.9 mm (1.6 in)
1977	37.8 mm (1.5 in)
1978	82.3 mm (3.2 in)
1979	38.9 mm (1.5 in)
1980	55.4 mm (2.2 in)
1981	42.4 mm (1.7 in)
1982	31.5 mm (1.2 in)
1983	60.2 mm (2.4 in)
1984	5.6 mm (0.22 in)
1985	61.5 mm (2.4 in)
1986	50.8 mm (2.0 in)
1987	46.0 mm (1.8 in)
1988	62.5 mm (2.5 in)
1989	45.0 mm (1.8 in)
1990	59.9 mm (2.4 in)
1991	49.8 mm (2.0 in)
1992	41.9 mm (1.6 in)
1993	33.8 mm (1.3 in)
1994	9.9 mm (0.39 in)
1995	74.9 mm (2.9 in)
1996	31.8 mm (1.3 in)
1997	17.8 mm (0.7 in)
1998	71.9 mm (2.8 in)
1999	53.8 mm (2.1 in)
2000	67.8 mm (2.7 in)
2001	95.8 mm (3.8 in)
2002	33.3 mm (1.3 in)
2003	58.9 mm (2.3 in)
2004	47.8 mm (1.9 in)
2005	45.0 mm (1.8 in)
2006	39.9 mm (1.6 in)
2007	59.9 mm (2.4 in)
2008	97.8 mm (3.9 in)
2009	19.8 mm (0.8 in)

Wettest five days (Rx5day)

The wettest five days of the year at San Juan Acazuchitlan, 1975 to 2009. The record is 206.5 mm (8.1 in) in 1998, marked on the chart; the median year is 90.2 mm (3.6 in).

Wettest five days (Rx5day) at San Juan Acazuchitlan by year
Year	Wettest five days (Rx5day)
1975	5.6 mm (0.22 in)
1976	90.2 mm (3.6 in)
1977	92.2 mm (3.6 in)
1978	100.1 mm (3.9 in)
1979	74.8 mm (2.9 in)
1980	88.2 mm (3.5 in)
1981	93.2 mm (3.7 in)
1982	57.9 mm (2.3 in)
1983	165.0 mm (6.5 in)
1984	9.7 mm (0.38 in)
1985	114.6 mm (4.5 in)
1986	86.7 mm (3.4 in)
1987	75.2 mm (3.0 in)
1988	123.9 mm (4.9 in)
1989	97.6 mm (3.8 in)
1990	101.8 mm (4.0 in)
1991	127.6 mm (5.0 in)
1992	79.6 mm (3.1 in)
1993	98.0 mm (3.9 in)
1994	26.0 mm (1.0 in)
1995	148.4 mm (5.8 in)
1996	72.4 mm (2.9 in)
1997	47.4 mm (1.9 in)
1998	206.5 mm (8.1 in)
1999	88.1 mm (3.5 in)
2000	79.7 mm (3.1 in)
2001	122.5 mm (4.8 in)
2002	61.7 mm (2.4 in)
2003	113.3 mm (4.5 in)
2004	56.0 mm (2.2 in)
2005	111.2 mm (4.4 in)
2006	79.5 mm (3.1 in)
2007	144.5 mm (5.7 in)
2008	189.6 mm (7.5 in)
2009	46.7 mm (1.8 in)

Longest dry spell (CDD)

The longest dry spell of the year at San Juan Acazuchitlan, 1975 to 2009. The record is 120 days in 2009, marked on the chart; the median year is 47 days.

Longest dry spell (CDD) at San Juan Acazuchitlan by year
Year	Longest dry spell (CDD)
1975	106 days
1976	79 days
1977	31 days
1978	23 days
1979	38 days
1980	40 days
1981	33 days
1982	43 days
1983	55 days
1984	47 days
1985	44 days
1986	52 days
1987	50 days
1988	38 days
1989	23 days
1990	27 days
1991	52 days
1992	29 days
1993	49 days
1994	41 days
1995	36 days
1996	83 days
1997	69 days
1998	100 days
1999	51 days
2000	39 days
2001	45 days
2002	52 days
2003	86 days
2004	96 days
2005	53 days
2006	38 days
2007	25 days
2008	111 days
2009	120 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 San Juan Acazuchitlan standing records by year: CSV or JSON. Field meanings are on the data page.
Data for San Juan Acazuchitlan 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).