San Isidro Weather Records (MXN00011160)

Record envelope, standing records and threshold days for San Isidro (MXN00011160), Mexico, with 33 years of record.

Key Facts for San Isidro

San Isidro (MXN00011160) is a weather station in Mexico at 20.57 latitude and -101.53 longitude, 1,694 m (5,557 ft) above sea level.
The station reports from 1980 to 2012, 33 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, 20.57 latitude, -101.53 longitude.
Elevation: 1,694 m (5,557 ft).
Period of record: 1980 to 2012, 33 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	29.4 C (84.9 F)	-10.6 C (12.9 F)	n/a	n/a
Feb	32.8 C (91.0 F)	-10.0 C (14.0 F)	n/a	n/a
Mar	36.7 C (98.1 F)	-8.3 C (17.1 F)	n/a	n/a
Apr	36.1 C (97.0 F)	-2.8 C (27.0 F)	n/a	n/a
May	37.8 C (100.0 F)	-0.6 C (30.9 F)	n/a	n/a
Jun	36.7 C (98.1 F)	3.9 C (39.0 F)	n/a	n/a
Jul	32.8 C (91.0 F)	3.9 C (39.0 F)	n/a	n/a
Aug	32.8 C (91.0 F)	0.6 C (33.1 F)	n/a	n/a
Sep	32.8 C (91.0 F)	0.0 C (32.0 F)	n/a	n/a
Oct	33.9 C (93.0 F)	-6.1 C (21.0 F)	n/a	n/a
Nov	30.6 C (87.1 F)	-13.3 C (8.1 F)	n/a	n/a
Dec	30.0 C (86.0 F)	-11.1 C (12.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at San Isidro still stand. 1980 holds the most, with 167.

Standing records at San Isidro by the year they were set
Year set	Standing records
1980	167
1981	71
1982	49
1983	66
1984	46
1985	42
1986	20
1987	46
1988	62
1989	56
1990	37
1991	6
1994	47
1995	47
1996	55
1997	73
1998	88
1999	64
2000	51
2001	27
2002	12
2003	25
2004	34
2005	22
2006	48
2007	26
2008	39
2009	39
2010	46
2011	33
2012	20

Wettest Day of Each Month

Jul: 66.5 mm (2.6 in)

The wettest day on record for each calendar month at San Isidro. The most was 66.5 mm (2.6 in) on 5 July 2003.

Record daily precipitation for each month at San Isidro
Month	Record daily precipitation (mm)	Date
Jan	17.3 mm (0.7 in)	31 January 2010
Feb	56.9 mm (2.2 in)	3 February 2010
Mar	30.2 mm (1.2 in)	19 March 1997
Apr	41.9 mm (1.6 in)	22 April 2006
May	35.6 mm (1.4 in)	26 May 2000
Jun	56.9 mm (2.2 in)	10 June 1999
Jul	66.5 mm (2.6 in)	5 July 2003
Aug	64.8 mm (2.6 in)	6 August 1989
Sep	66.0 mm (2.6 in)	7 September 2003
Oct	41.9 mm (1.6 in)	1 October 1998
Nov	22.9 mm (0.9 in)	8 November 1983
Dec	17.8 mm (0.7 in)	14 December 2004

Period of Record Coverage

1980 to 2012

31 years of record at San Isidro, 1980 to 2012. 5 years have data for under 90 percent of days and are left out of rankings: 1980, 1986, 1991, 2002, 2012.

Days with data per year at San Isidro
Year	Days with data	Share of year	Complete
1980	223	61%	No
1981	335	92%	Yes
1982	334	92%	Yes
1983	365	100%	Yes
1984	365	100%	Yes
1985	364	100%	Yes
1986	181	50%	No
1987	334	92%	Yes
1988	366	100%	Yes
1989	358	98%	Yes
1990	365	100%	Yes
1991	59	16%	No
1994	364	100%	Yes
1995	363	99%	Yes
1996	366	100%	Yes
1997	363	99%	Yes
1998	365	100%	Yes
1999	365	100%	Yes
2000	366	100%	Yes
2001	334	92%	Yes
2002	92	25%	No
2003	364	100%	Yes
2004	366	100%	Yes
2005	365	100%	Yes
2006	365	100%	Yes
2007	365	100%	Yes
2008	366	100%	Yes
2009	334	92%	Yes
2010	365	100%	Yes
2011	364	100%	Yes
2012	305	83%	No

Latest Records

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

Climate Trend

21 complete years, 1983 to 2011

One stripe for each of 21 complete years at San Isidro, 1983 to 2011. Blue stripes are years cooler than the station's own mean of 16.0 C (60.9 F); red stripes are warmer. The coolest year was 1984, at 15.3 C (59.6 F), and the warmest was 1996, at 16.6 C (61.9 F). The strongest colour marks a difference of 0.8 C (1.4 F).

Annual mean temperature at San Isidro as warming stripes, 1983 to 2011
Year	Annual mean temperature	Difference from the station mean
1983	15.8 C	-0.27 C
1984	15.3 C	-0.71 C
1985	15.5 C	-0.50 C
1988	15.8 C	-0.27 C
1989	15.9 C	-0.13 C
1990	16.1 C	+0.03 C
1994	16.4 C	+0.31 C
1995	16.6 C	+0.55 C
1996	16.6 C	+0.58 C
1997	15.9 C	-0.18 C
1998	16.2 C	+0.15 C
1999	16.0 C	-0.02 C
2000	16.4 C	+0.36 C
2003	16.6 C	+0.51 C
2004	16.1 C	+0.01 C
2005	16.6 C	+0.55 C
2006	16.0 C	-0.01 C
2007	15.8 C	-0.29 C
2008	15.5 C	-0.54 C
2010	15.7 C	-0.37 C
2011	16.2 C	+0.16 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

1980 to 2012

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)	37.8 C (100.0 F)	1998	35.6 C (96.1 F)	31
Coldest night (TNn)	-13.3 C (8.1 F)	2011	-7.2 C (19.0 F)	31
Wettest day (Rx1day)	66.5 mm (2.6 in)	2003	35.6 mm (1.4 in)	31
Wettest five days (Rx5day)	152.8 mm (6.0 in)	2003	78.8 mm (3.1 in)	31
Longest dry spell (CDD)	154 days	1989	79 days	31

Hottest day (TXx)

The hottest day of the year at San Isidro, 1980 to 2012. The record is 37.8 C (100.0 F) in 1998, marked on the chart; the median year is 35.6 C (96.1 F).

Hottest day (TXx) at San Isidro by year
Year	Hottest day (TXx)
1980	36.7 C (98.1 F)
1981	33.9 C (93.0 F)
1982	35.6 C (96.1 F)
1983	36.7 C (98.1 F)
1984	32.8 C (91.0 F)
1985	35.0 C (95.0 F)
1986	35.6 C (96.1 F)
1987	32.8 C (91.0 F)
1988	35.0 C (95.0 F)
1989	36.7 C (98.1 F)
1990	36.1 C (97.0 F)
1991	27.8 C (82.0 F)
1994	35.0 C (95.0 F)
1995	35.0 C (95.0 F)
1996	35.6 C (96.1 F)
1997	35.0 C (95.0 F)
1998	37.8 C (100.0 F)
1999	36.7 C (98.1 F)
2000	35.6 C (96.1 F)
2001	37.8 C (100.0 F)
2002	30.0 C (86.0 F)
2003	36.7 C (98.1 F)
2004	32.8 C (91.0 F)
2005	36.7 C (98.1 F)
2006	35.0 C (95.0 F)
2007	33.9 C (93.0 F)
2008	36.7 C (98.1 F)
2009	35.6 C (96.1 F)
2010	35.6 C (96.1 F)
2011	37.8 C (100.0 F)
2012	37.8 C (100.0 F)

Coldest night (TNn)

The coldest night of the year at San Isidro, 1980 to 2012. The record is -13.3 C (8.1 F) in 2011, marked on the chart; the median year is -7.2 C (19.0 F).

Coldest night (TNn) at San Isidro by year
Year	Coldest night (TNn)
1980	-2.2 C (28.0 F)
1981	-3.3 C (26.1 F)
1982	-6.1 C (21.0 F)
1983	-5.0 C (23.0 F)
1984	-5.0 C (23.0 F)
1985	-5.0 C (23.0 F)
1986	-5.0 C (23.0 F)
1987	-6.1 C (21.0 F)
1988	-10.0 C (14.0 F)
1989	-8.3 C (17.1 F)
1990	-7.2 C (19.0 F)
1991	-7.2 C (19.0 F)
1994	-7.2 C (19.0 F)
1995	-2.8 C (27.0 F)
1996	-8.3 C (17.1 F)
1997	-8.3 C (17.1 F)
1998	-10.0 C (14.0 F)
1999	-10.6 C (12.9 F)
2000	-5.0 C (23.0 F)
2001	-4.4 C (24.1 F)
2002	1.7 C (35.1 F)
2003	0.0 C (32.0 F)
2004	0.0 C (32.0 F)
2005	-7.2 C (19.0 F)
2006	-11.1 C (12.0 F)
2007	-6.1 C (21.0 F)
2008	-9.4 C (15.1 F)
2009	-7.2 C (19.0 F)
2010	-10.0 C (14.0 F)
2011	-13.3 C (8.1 F)
2012	-7.2 C (19.0 F)

Wettest day (Rx1day)

The wettest day of the year at San Isidro, 1980 to 2012. The record is 66.5 mm (2.6 in) in 2003, marked on the chart; the median year is 35.6 mm (1.4 in).

Wettest day (Rx1day) at San Isidro by year
Year	Wettest day (Rx1day)
1980	34.8 mm (1.4 in)
1981	30.0 mm (1.2 in)
1982	24.9 mm (1.0 in)
1983	25.9 mm (1.0 in)
1984	28.4 mm (1.1 in)
1985	34.5 mm (1.4 in)
1986	29.0 mm (1.1 in)
1987	19.8 mm (0.8 in)
1988	46.5 mm (1.8 in)
1989	64.8 mm (2.6 in)
1990	47.0 mm (1.9 in)
1991	6.9 mm (0.27 in)
1994	42.9 mm (1.7 in)
1995	41.9 mm (1.6 in)
1996	32.8 mm (1.3 in)
1997	30.2 mm (1.2 in)
1998	41.9 mm (1.6 in)
1999	56.9 mm (2.2 in)
2000	35.6 mm (1.4 in)
2001	32.3 mm (1.3 in)
2002	19.8 mm (0.8 in)
2003	66.5 mm (2.6 in)
2004	29.5 mm (1.2 in)
2005	56.4 mm (2.2 in)
2006	49.8 mm (2.0 in)
2007	42.2 mm (1.7 in)
2008	62.7 mm (2.5 in)
2009	31.5 mm (1.2 in)
2010	56.9 mm (2.2 in)
2011	54.9 mm (2.2 in)
2012	35.8 mm (1.4 in)

Wettest five days (Rx5day)

The wettest five days of the year at San Isidro, 1980 to 2012. The record is 152.8 mm (6.0 in) in 2003, marked on the chart; the median year is 78.8 mm (3.1 in).

Wettest five days (Rx5day) at San Isidro by year
Year	Wettest five days (Rx5day)
1980	133.9 mm (5.3 in)
1981	55.7 mm (2.2 in)
1982	76.6 mm (3.0 in)
1983	41.9 mm (1.6 in)
1984	73.8 mm (2.9 in)
1985	88.5 mm (3.5 in)
1986	77.2 mm (3.0 in)
1987	54.1 mm (2.1 in)
1988	117.9 mm (4.6 in)
1989	85.1 mm (3.4 in)
1990	78.8 mm (3.1 in)
1991	9.7 mm (0.38 in)
1994	82.1 mm (3.2 in)
1995	73.7 mm (2.9 in)
1996	86.7 mm (3.4 in)
1997	64.7 mm (2.5 in)
1998	104.8 mm (4.1 in)
1999	66.9 mm (2.6 in)
2000	58.0 mm (2.3 in)
2001	68.9 mm (2.7 in)
2002	32.5 mm (1.3 in)
2003	152.8 mm (6.0 in)
2004	76.6 mm (3.0 in)
2005	84.1 mm (3.3 in)
2006	88.8 mm (3.5 in)
2007	108.0 mm (4.3 in)
2008	104.3 mm (4.1 in)
2009	79.7 mm (3.1 in)
2010	123.7 mm (4.9 in)
2011	85.4 mm (3.4 in)
2012	74.5 mm (2.9 in)

Longest dry spell (CDD)

The longest dry spell of the year at San Isidro, 1980 to 2012. The record is 154 days in 1989, marked on the chart; the median year is 79 days.

Longest dry spell (CDD) at San Isidro by year
Year	Longest dry spell (CDD)
1980	68 days
1981	41 days
1982	43 days
1983	124 days
1984	55 days
1985	97 days
1986	151 days
1987	40 days
1988	61 days
1989	154 days
1990	69 days
1991	22 days
1994	87 days
1995	101 days
1996	126 days
1997	38 days
1998	89 days
1999	85 days
2000	140 days
2001	60 days
2002	57 days
2003	116 days
2004	32 days
2005	79 days
2006	86 days
2007	54 days
2008	102 days
2009	63 days
2010	102 days
2011	80 days
2012	62 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

21 years with a frost

Across 21 years with a frost, the median last spring frost at San Isidro falls on 30 March and the median first autumn frost on 24 October, which leaves a median of 214 days between them.

Frost dates and growing season at San Isidro
Measure	Median, all years	Earliest period	Recent period (1983 to 2011)	Recent against earliest	Fitted trend
Last spring frost	30 March	n/a	30 March	n/a	n/a
First autumn frost	24 October	n/a	24 October	n/a	n/a
Growing days	214 days	n/a	214 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.

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).