San Isidro Weather Records (MXN00028194)

Record envelope, standing records and threshold days for San Isidro (MXN00028194), Mexico, with 31 years of record.

Key Facts for San Isidro

San Isidro (MXN00028194) is a weather station in Mexico at 24.18 latitude and -99.33 longitude, 273 m (895 ft) above sea level.
The station reports from 1979 to 2009, 31 years of record.
1,464 records set at San Isidro still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Mexico, 24.18 latitude, -99.33 longitude.
Elevation: 273 m (895 ft).
Period of record: 1979 to 2009, 31 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 San Isidro. 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 Isidro, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	36.1 C (97.0 F)	-2.2 C (28.0 F)	n/a	n/a
Feb	37.8 C (100.0 F)	-1.1 C (30.0 F)	n/a	n/a
Mar	40.6 C (105.1 F)	-2.2 C (28.0 F)	n/a	n/a
Apr	47.8 C (118.0 F)	1.7 C (35.1 F)	n/a	n/a
May	47.8 C (118.0 F)	8.9 C (48.0 F)	n/a	n/a
Jun	46.7 C (116.1 F)	12.8 C (55.0 F)	n/a	n/a
Jul	45.0 C (113.0 F)	12.8 C (55.0 F)	n/a	n/a
Aug	45.6 C (114.1 F)	11.7 C (53.1 F)	n/a	n/a
Sep	43.9 C (111.0 F)	7.8 C (46.0 F)	n/a	n/a
Oct	40.6 C (105.1 F)	5.0 C (41.0 F)	n/a	n/a
Nov	38.9 C (102.0 F)	1.7 C (35.1 F)	n/a	n/a
Dec	35.0 C (95.0 F)	-5.0 C (23.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at San Isidro still stand. 2006 holds the most, with 104.

Standing records at San Isidro by the year they were set
Year set	Standing records
1980	46
1981	100
1982	77
1983	54
1984	65
1985	33
1986	20
1987	31
1988	42
1989	26
1990	36
1991	51
1992	32
1993	42
1994	69
1995	40
1996	76
1997	44
1998	27
1999	29
2000	24
2001	50
2002	54
2003	21
2004	45
2005	78
2006	104
2007	48
2008	51
2009	49

Wettest Day of Each Month

Sep: 339.9 mm (13.4 in)

The wettest day on record for each calendar month at San Isidro. The most was 339.9 mm (13.4 in) on 2 September 2004.

Record daily precipitation for each month at San Isidro
Month	Record daily precipitation (mm)	Date
Jan	59.9 mm (2.4 in)	21 January 1994
Feb	39.9 mm (1.6 in)	10 February 2008
Mar	69.9 mm (2.8 in)	30 March 1992
Apr	99.8 mm (3.9 in)	24 April 2006
May	80.0 mm (3.1 in)	29 May 1986
Jun	80.3 mm (3.2 in)	16 June 1981
Jul	140.0 mm (5.5 in)	6 July 2008
Aug	110.0 mm (4.3 in)	23 August 1996
Sep	339.9 mm (13.4 in)	2 September 2004
Oct	99.8 mm (3.9 in)	9 October 1982
Nov	45.0 mm (1.8 in)	17 November 1995
Dec	68.3 mm (2.7 in)	2 December 1979

Period of Record Coverage

1980 to 2009

30 years of record at San Isidro, 1980 to 2009. 7 years have data for under 90 percent of days and are left out of rankings: 1980, 1984, 1985, 1986, 1989, 1998, 2003.

Days with data per year at San Isidro
Year	Days with data	Share of year	Complete
1980	313	86%	No
1981	363	99%	Yes
1982	359	98%	Yes
1983	361	99%	Yes
1984	298	81%	No
1985	301	82%	No
1986	306	84%	No
1987	365	100%	Yes
1988	337	92%	Yes
1989	153	42%	No
1990	365	100%	Yes
1991	365	100%	Yes
1992	363	99%	Yes
1993	364	100%	Yes
1994	363	99%	Yes
1995	363	99%	Yes
1996	364	99%	Yes
1997	363	99%	Yes
1998	273	75%	No
1999	365	100%	Yes
2000	365	100%	Yes
2001	365	100%	Yes
2002	365	100%	Yes
2003	302	83%	No
2004	363	99%	Yes
2005	362	99%	Yes
2006	364	100%	Yes
2007	361	99%	Yes
2008	366	100%	Yes
2009	357	98%	Yes

Latest Records

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

Climate Trend

22 complete years, 1981 to 2009

One stripe for each of 22 complete years at San Isidro, 1981 to 2009. Blue stripes are years cooler than the station's own mean of 22.7 C (72.8 F); red stripes are warmer. The coolest year was 2007, at 21.9 C (71.5 F), and the warmest was 2001, at 23.9 C (75.0 F). The strongest colour marks a difference of 1.3 C (2.3 F).

Annual mean temperature at San Isidro as warming stripes, 1981 to 2009
Year	Annual mean temperature	Difference from the station mean
1981	22.8 C	+0.12 C
1982	22.8 C	+0.09 C
1983	22.9 C	+0.21 C
1987	22.2 C	-0.50 C
1990	23.3 C	+0.66 C
1991	23.4 C	+0.74 C
1992	22.0 C	-0.72 C
1993	22.8 C	+0.15 C
1994	23.4 C	+0.75 C
1995	22.3 C	-0.40 C
1996	23.1 C	+0.44 C
1997	22.3 C	-0.38 C
1999	22.8 C	+0.16 C
2000	22.8 C	+0.15 C
2001	23.9 C	+1.20 C
2002	22.0 C	-0.69 C
2004	22.0 C	-0.67 C
2005	22.7 C	+0.01 C
2006	23.3 C	+0.64 C
2007	21.9 C	-0.76 C
2008	22.1 C	-0.59 C
2009	22.0 C	-0.71 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

1979 to 2009

Yearly extremes at San Isidro: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	47.8 C (118.0 F)	1998	42.0 C (107.5 F)	30
Coldest night (TNn)	-5.0 C (23.0 F)	1989	0.0 C (32.0 F)	30
Wettest day (Rx1day)	339.9 mm (13.4 in)	2004	80.0 mm (3.1 in)	31
Wettest five days (Rx5day)	434.7 mm (17.1 in)	2004	159.3 mm (6.3 in)	31
Longest dry spell (CDD)	108 days	2000	60 days	31

Hottest day (TXx)

The hottest day of the year at San Isidro, 1979 to 2009. The record is 47.8 C (118.0 F) in 1998, marked on the chart; the median year is 42.0 C (107.5 F).

Hottest day (TXx) at San Isidro by year
Year	Hottest day (TXx)
1979	n/a
1980	42.2 C (108.0 F)
1981	38.9 C (102.0 F)
1982	40.6 C (105.1 F)
1983	42.2 C (108.0 F)
1984	45.0 C (113.0 F)
1985	40.0 C (104.0 F)
1986	40.0 C (104.0 F)
1987	40.0 C (104.0 F)
1988	40.6 C (105.1 F)
1989	40.0 C (104.0 F)
1990	41.7 C (107.1 F)
1991	45.0 C (113.0 F)
1992	45.0 C (113.0 F)
1993	40.0 C (104.0 F)
1994	40.0 C (104.0 F)
1995	42.8 C (109.0 F)
1996	41.7 C (107.1 F)
1997	41.7 C (107.1 F)
1998	47.8 C (118.0 F)
1999	45.0 C (113.0 F)
2000	43.9 C (111.0 F)
2001	41.7 C (107.1 F)
2002	40.0 C (104.0 F)
2003	40.0 C (104.0 F)
2004	45.0 C (113.0 F)
2005	46.7 C (116.1 F)
2006	47.8 C (118.0 F)
2007	45.6 C (114.1 F)
2008	45.0 C (113.0 F)
2009	45.0 C (113.0 F)

Coldest night (TNn)

The coldest night of the year at San Isidro, 1979 to 2009. The record is -5.0 C (23.0 F) in 1989, marked on the chart; the median year is 0.0 C (32.0 F).

Coldest night (TNn) at San Isidro by year
Year	Coldest night (TNn)
1979	n/a
1980	0.6 C (33.1 F)
1981	0.0 C (32.0 F)
1982	-1.7 C (28.9 F)
1983	-4.4 C (24.1 F)
1984	0.0 C (32.0 F)
1985	0.0 C (32.0 F)
1986	3.9 C (39.0 F)
1987	0.6 C (33.1 F)
1988	0.0 C (32.0 F)
1989	-5.0 C (23.0 F)
1990	0.0 C (32.0 F)
1991	0.6 C (33.1 F)
1992	1.7 C (35.1 F)
1993	1.7 C (35.1 F)
1994	3.9 C (39.0 F)
1995	-1.1 C (30.0 F)
1996	-1.1 C (30.0 F)
1997	-1.1 C (30.0 F)
1998	2.8 C (37.0 F)
1999	2.8 C (37.0 F)
2000	5.0 C (41.0 F)
2001	5.0 C (41.0 F)
2002	0.6 C (33.1 F)
2003	1.7 C (35.1 F)
2004	-1.1 C (30.0 F)
2005	0.6 C (33.1 F)
2006	-2.2 C (28.0 F)
2007	0.0 C (32.0 F)
2008	-2.2 C (28.0 F)
2009	-1.1 C (30.0 F)

Wettest day (Rx1day)

The wettest day of the year at San Isidro, 1979 to 2009. The record is 339.9 mm (13.4 in) in 2004, marked on the chart; the median year is 80.0 mm (3.1 in).

Wettest day (Rx1day) at San Isidro by year
Year	Wettest day (Rx1day)
1979	68.3 mm (2.7 in)
1980	47.5 mm (1.9 in)
1981	80.3 mm (3.2 in)
1982	99.8 mm (3.9 in)
1983	80.0 mm (3.1 in)
1984	45.0 mm (1.8 in)
1985	78.0 mm (3.1 in)
1986	80.0 mm (3.1 in)
1987	79.8 mm (3.1 in)
1988	69.9 mm (2.8 in)
1989	49.8 mm (2.0 in)
1990	99.8 mm (3.9 in)
1991	64.8 mm (2.6 in)
1992	69.9 mm (2.8 in)
1993	89.9 mm (3.5 in)
1994	79.8 mm (3.1 in)
1995	72.9 mm (2.9 in)
1996	110.0 mm (4.3 in)
1997	89.9 mm (3.5 in)
1998	34.8 mm (1.4 in)
1999	9.9 mm (0.39 in)
2000	30.0 mm (1.2 in)
2001	89.9 mm (3.5 in)
2002	119.9 mm (4.7 in)
2003	140.0 mm (5.5 in)
2004	339.9 mm (13.4 in)
2005	104.9 mm (4.1 in)
2006	99.8 mm (3.9 in)
2007	104.9 mm (4.1 in)
2008	140.0 mm (5.5 in)
2009	114.8 mm (4.5 in)

Wettest five days (Rx5day)

The wettest five days of the year at San Isidro, 1979 to 2009. The record is 434.7 mm (17.1 in) in 2004, marked on the chart; the median year is 159.3 mm (6.3 in).

Wettest five days (Rx5day) at San Isidro by year
Year	Wettest five days (Rx5day)
1979	118.1 mm (4.6 in)
1980	57.7 mm (2.3 in)
1981	168.3 mm (6.6 in)
1982	133.4 mm (5.3 in)
1983	155.5 mm (6.1 in)
1984	73.9 mm (2.9 in)
1985	112.6 mm (4.4 in)
1986	191.7 mm (7.5 in)
1987	211.4 mm (8.3 in)
1988	160.3 mm (6.3 in)
1989	113.1 mm (4.5 in)
1990	139.5 mm (5.5 in)
1991	159.3 mm (6.3 in)
1992	89.7 mm (3.5 in)
1993	173.5 mm (6.8 in)
1994	139.9 mm (5.5 in)
1995	109.7 mm (4.3 in)
1996	199.7 mm (7.9 in)
1997	284.3 mm (11.2 in)
1998	42.7 mm (1.7 in)
1999	22.3 mm (0.9 in)
2000	49.5 mm (1.9 in)
2001	195.3 mm (7.7 in)
2002	309.4 mm (12.2 in)
2003	276.4 mm (10.9 in)
2004	434.7 mm (17.1 in)
2005	294.3 mm (11.6 in)
2006	121.4 mm (4.8 in)
2007	184.5 mm (7.3 in)
2008	307.3 mm (12.1 in)
2009	229.4 mm (9.0 in)

Longest dry spell (CDD)

The longest dry spell of the year at San Isidro, 1979 to 2009. The record is 108 days in 2000, marked on the chart; the median year is 60 days.

Longest dry spell (CDD) at San Isidro by year
Year	Longest dry spell (CDD)
1979	41 days
1980	39 days
1981	32 days
1982	85 days
1983	52 days
1984	95 days
1985	43 days
1986	64 days
1987	65 days
1988	60 days
1989	54 days
1990	40 days
1991	56 days
1992	69 days
1993	70 days
1994	35 days
1995	60 days
1996	86 days
1997	71 days
1998	80 days
1999	76 days
2000	108 days
2001	106 days
2002	97 days
2003	60 days
2004	41 days
2005	37 days
2006	53 days
2007	46 days
2008	50 days
2009	65 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 Isidro standing records by year: CSV or JSON. Field meanings are on the data page.
Data for San Isidro 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).