San Geronimo Weather Records (MXN00032131)

Record envelope, standing records and threshold days for San Geronimo (MXN00032131), Mexico, with 35 years of record.

Key Facts for San Geronimo

San Geronimo (MXN00032131) is a weather station in Mexico at 22.65 latitude and -102.48 longitude, 2,266 m (7,434 ft) above sea level.
The station reports from 1978 to 2012, 35 years of record.
1,464 records set at San Geronimo still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.

About the Station

Location: Mexico, 22.65 latitude, -102.48 longitude.
Elevation: 2,266 m (7,434 ft).
Period of record: 1978 to 2012, 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 Geronimo. 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 Geronimo, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	26.7 C (80.1 F)	-8.3 C (17.1 F)	n/a	n/a
Feb	28.9 C (84.0 F)	-9.4 C (15.1 F)	n/a	n/a
Mar	30.0 C (86.0 F)	-6.1 C (21.0 F)	n/a	n/a
Apr	35.0 C (95.0 F)	-2.2 C (28.0 F)	n/a	n/a
May	35.0 C (95.0 F)	2.8 C (37.0 F)	n/a	n/a
Jun	33.9 C (93.0 F)	6.7 C (44.1 F)	n/a	n/a
Jul	30.0 C (86.0 F)	5.0 C (41.0 F)	n/a	n/a
Aug	30.0 C (86.0 F)	3.9 C (39.0 F)	n/a	n/a
Sep	29.4 C (84.9 F)	1.7 C (35.1 F)	n/a	n/a
Oct	30.0 C (86.0 F)	-2.2 C (28.0 F)	n/a	n/a
Nov	28.9 C (84.0 F)	-12.2 C (10.0 F)	n/a	n/a
Dec	27.8 C (82.0 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 Geronimo still stand. 1998 holds the most, with 97.

Standing records at San Geronimo by the year they were set
Year set	Standing records
1978	5
1979	15
1980	41
1981	27
1982	50
1983	58
1984	42
1985	25
1986	19
1987	62
1988	18
1989	17
1990	39
1991	49
1992	51
1993	36
1994	41
1995	38
1996	35
1997	81
1998	97
1999	56
2000	70
2001	36
2002	43
2003	63
2004	79
2005	71
2009	43
2010	59
2011	53
2012	45

Wettest Day of Each Month

Jun: 68.8 mm (2.7 in)

The wettest day on record for each calendar month at San Geronimo. The most was 68.8 mm (2.7 in) on 25 June 1996.

Record daily precipitation for each month at San Geronimo
Month	Record daily precipitation (mm)	Date
Jan	39.9 mm (1.6 in)	12 January 1987
Feb	33.8 mm (1.3 in)	2 February 2010
Mar	24.9 mm (1.0 in)	30 March 2004
Apr	19.8 mm (0.8 in)	21 April 1994
May	49.8 mm (2.0 in)	27 May 1983
Jun	68.8 mm (2.7 in)	25 June 1996
Jul	49.8 mm (2.0 in)	1 July 1991
Aug	56.4 mm (2.2 in)	20 August 2003
Sep	58.4 mm (2.3 in)	2 September 2011
Oct	39.9 mm (1.6 in)	18 October 1983
Nov	47.8 mm (1.9 in)	14 November 1979
Dec	18.8 mm (0.7 in)	5 December 2009

Period of Record Coverage

1978 to 2012

32 years of record at San Geronimo, 1978 to 2012. 11 years have data for under 90 percent of days and are left out of rankings: 1978, 1979, 1980, 1981, 1982, 1986, 1987, 1988 and others.

Days with data per year at San Geronimo
Year	Days with data	Share of year	Complete
1978	10	3%	No
1979	106	29%	No
1980	244	67%	No
1981	247	68%	No
1982	303	83%	No
1983	364	100%	Yes
1984	366	100%	Yes
1985	365	100%	Yes
1986	273	75%	No
1987	311	85%	No
1988	197	54%	No
1989	238	65%	No
1990	192	53%	No
1991	334	92%	Yes
1992	365	100%	Yes
1993	364	100%	Yes
1994	365	100%	Yes
1995	364	100%	Yes
1996	366	100%	Yes
1997	364	100%	Yes
1998	198	54%	No
1999	365	100%	Yes
2000	364	99%	Yes
2001	333	91%	Yes
2002	364	100%	Yes
2003	365	100%	Yes
2004	365	100%	Yes
2005	365	100%	Yes
2009	365	100%	Yes
2010	364	100%	Yes
2011	365	100%	Yes
2012	365	100%	Yes

Latest Records

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

Climate Trend

17 complete years, 1983 to 2012

One stripe for each of 17 complete years at San Geronimo, 1983 to 2012. Blue stripes are years cooler than the station's own mean of 14.7 C (58.5 F); red stripes are warmer. The coolest year was 1997, at 13.5 C (56.2 F), and the warmest was 2011, at 15.8 C (60.5 F). The strongest colour marks a difference of 1.3 C (2.3 F).

Annual mean temperature at San Geronimo as warming stripes, 1983 to 2012
Year	Annual mean temperature	Difference from the station mean
1983	14.5 C	-0.21 C
1984	14.6 C	-0.15 C
1985	14.6 C	-0.15 C
1992	14.0 C	-0.76 C
1993	14.5 C	-0.23 C
1994	14.9 C	+0.14 C
1995	14.6 C	-0.14 C
1996	14.1 C	-0.65 C
1997	13.5 C	-1.29 C
1999	15.0 C	+0.27 C
2002	15.2 C	+0.50 C
2004	14.4 C	-0.30 C
2005	15.0 C	+0.25 C
2009	15.7 C	+0.93 C
2010	14.6 C	-0.12 C
2011	15.8 C	+1.08 C
2012	15.6 C	+0.89 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

1978 to 2012

Yearly extremes at San Geronimo: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	35.0 C (95.0 F)	1980	31.7 C (89.1 F)	32
Coldest night (TNn)	-12.2 C (10.0 F)	2011	-5.5 C (22.0 F)	32
Wettest day (Rx1day)	68.8 mm (2.7 in)	1996	37.5 mm (1.5 in)	32
Wettest five days (Rx5day)	116.6 mm (4.6 in)	1991	70.8 mm (2.8 in)	32
Longest dry spell (CDD)	171 days	2011	76 days	32

Hottest day (TXx)

The hottest day of the year at San Geronimo, 1978 to 2012. The record is 35.0 C (95.0 F) in 1980, marked on the chart; the median year is 31.7 C (89.1 F).

Hottest day (TXx) at San Geronimo by year
Year	Hottest day (TXx)
1978	23.9 C (75.0 F)
1979	27.8 C (82.0 F)
1980	35.0 C (95.0 F)
1981	28.9 C (84.0 F)
1982	32.8 C (91.0 F)
1983	33.9 C (93.0 F)
1984	30.0 C (86.0 F)
1985	31.7 C (89.1 F)
1986	31.7 C (89.1 F)
1987	29.4 C (84.9 F)
1988	30.0 C (86.0 F)
1989	33.3 C (91.9 F)
1990	33.3 C (91.9 F)
1991	30.0 C (86.0 F)
1992	28.9 C (84.0 F)
1993	30.0 C (86.0 F)
1994	28.9 C (84.0 F)
1995	30.0 C (86.0 F)
1996	30.0 C (86.0 F)
1997	31.7 C (89.1 F)
1998	31.7 C (89.1 F)
1999	32.8 C (91.0 F)
2000	31.7 C (89.1 F)
2001	32.8 C (91.0 F)
2002	31.7 C (89.1 F)
2003	33.9 C (93.0 F)
2004	31.7 C (89.1 F)
2005	33.9 C (93.0 F)
2009	32.8 C (91.0 F)
2010	32.8 C (91.0 F)
2011	35.0 C (95.0 F)
2012	32.8 C (91.0 F)

Coldest night (TNn)

The coldest night of the year at San Geronimo, 1978 to 2012. The record is -12.2 C (10.0 F) in 2011, marked on the chart; the median year is -5.5 C (22.0 F).

Coldest night (TNn) at San Geronimo by year
Year	Coldest night (TNn)
1978	-8.3 C (17.1 F)
1979	-8.3 C (17.1 F)
1980	-2.2 C (28.0 F)
1981	-4.4 C (24.1 F)
1982	-2.2 C (28.0 F)
1983	-4.4 C (24.1 F)
1984	-5.0 C (23.0 F)
1985	-2.8 C (27.0 F)
1986	-5.0 C (23.0 F)
1987	-5.0 C (23.0 F)
1988	0.0 C (32.0 F)
1989	0.0 C (32.0 F)
1990	-6.1 C (21.0 F)
1991	-6.1 C (21.0 F)
1992	-3.3 C (26.1 F)
1993	-3.3 C (26.1 F)
1994	-3.3 C (26.1 F)
1995	-3.3 C (26.1 F)
1996	-6.1 C (21.0 F)
1997	-11.1 C (12.0 F)
1998	-9.4 C (15.1 F)
1999	-7.2 C (19.0 F)
2000	-7.2 C (19.0 F)
2001	-6.1 C (21.0 F)
2002	-7.2 C (19.0 F)
2003	-10.0 C (14.0 F)
2004	-9.4 C (15.1 F)
2005	-5.0 C (23.0 F)
2009	-4.4 C (24.1 F)
2010	-7.2 C (19.0 F)
2011	-12.2 C (10.0 F)
2012	-6.7 C (19.9 F)

Wettest day (Rx1day)

The wettest day of the year at San Geronimo, 1978 to 2012. The record is 68.8 mm (2.7 in) in 1996, marked on the chart; the median year is 37.5 mm (1.5 in).

Wettest day (Rx1day) at San Geronimo by year
Year	Wettest day (Rx1day)
1978	4.8 mm (0.19 in)
1979	47.8 mm (1.9 in)
1980	15.7 mm (0.6 in)
1981	49.8 mm (2.0 in)
1982	30.0 mm (1.2 in)
1983	49.8 mm (2.0 in)
1984	31.0 mm (1.2 in)
1985	33.8 mm (1.3 in)
1986	41.9 mm (1.6 in)
1987	39.9 mm (1.6 in)
1988	34.8 mm (1.4 in)
1989	39.1 mm (1.5 in)
1990	48.3 mm (1.9 in)
1991	49.8 mm (2.0 in)
1992	29.0 mm (1.1 in)
1993	48.8 mm (1.9 in)
1994	24.9 mm (1.0 in)
1995	35.8 mm (1.4 in)
1996	68.8 mm (2.7 in)
1997	30.5 mm (1.2 in)
1998	63.5 mm (2.5 in)
1999	20.3 mm (0.8 in)
2000	39.9 mm (1.6 in)
2001	34.8 mm (1.4 in)
2002	47.5 mm (1.9 in)
2003	56.4 mm (2.2 in)
2004	35.3 mm (1.4 in)
2005	26.9 mm (1.1 in)
2009	30.0 mm (1.2 in)
2010	39.9 mm (1.6 in)
2011	58.4 mm (2.3 in)
2012	25.9 mm (1.0 in)

Wettest five days (Rx5day)

The wettest five days of the year at San Geronimo, 1978 to 2012. The record is 116.6 mm (4.6 in) in 1991, marked on the chart; the median year is 70.8 mm (2.8 in).

Wettest five days (Rx5day) at San Geronimo by year
Year	Wettest five days (Rx5day)
1978	4.8 mm (0.19 in)
1979	48.1 mm (1.9 in)
1980	22.1 mm (0.9 in)
1981	102.7 mm (4.0 in)
1982	52.6 mm (2.1 in)
1983	98.9 mm (3.9 in)
1984	48.2 mm (1.9 in)
1985	86.4 mm (3.4 in)
1986	83.3 mm (3.3 in)
1987	71.3 mm (2.8 in)
1988	79.8 mm (3.1 in)
1989	90.5 mm (3.6 in)
1990	70.2 mm (2.8 in)
1991	116.6 mm (4.6 in)
1992	53.6 mm (2.1 in)
1993	63.3 mm (2.5 in)
1994	67.3 mm (2.6 in)
1995	55.4 mm (2.2 in)
1996	75.7 mm (3.0 in)
1997	46.3 mm (1.8 in)
1998	77.5 mm (3.1 in)
1999	35.6 mm (1.4 in)
2000	52.9 mm (2.1 in)
2001	68.9 mm (2.7 in)
2002	110.0 mm (4.3 in)
2003	90.8 mm (3.6 in)
2004	67.8 mm (2.7 in)
2005	85.1 mm (3.4 in)
2009	98.9 mm (3.9 in)
2010	96.2 mm (3.8 in)
2011	84.4 mm (3.3 in)
2012	50.6 mm (2.0 in)

Longest dry spell (CDD)

The longest dry spell of the year at San Geronimo, 1978 to 2012. The record is 171 days in 2011, marked on the chart; the median year is 76 days.

Longest dry spell (CDD) at San Geronimo by year
Year	Longest dry spell (CDD)
1978	5 days
1979	53 days
1980	50 days
1981	31 days
1982	79 days
1983	73 days
1984	99 days
1985	82 days
1986	83 days
1987	41 days
1988	66 days
1989	119 days
1990	41 days
1991	86 days
1992	30 days
1993	82 days
1994	87 days
1995	93 days
1996	70 days
1997	36 days
1998	159 days
1999	155 days
2000	74 days
2001	56 days
2002	59 days
2003	105 days
2004	61 days
2005	77 days
2009	109 days
2010	102 days
2011	171 days
2012	47 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 Geronimo standing records by year: CSV or JSON. Field meanings are on the data page.
Data for San Geronimo 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 2026-10-16 (16 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).