Rio Santiago Weather Records (MXN00012158)

Record envelope, standing records and threshold days for Rio Santiago (MXN00012158), Mexico, with 41 years of record.

Key Facts for Rio Santiago

Rio Santiago (MXN00012158) is a weather station in Mexico at 17.25 latitude and -100.32 longitude, 430 m (1,410 ft) above sea level.
The station reports from 1972 to 2012, 41 years of record.
1,464 records set at Rio Santiago still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Rio Santiago set a daily record precipitation of 61.0 mm (2.4 in) on 6 September 2012.

About the Station

Location: Mexico, 17.25 latitude, -100.32 longitude.
Elevation: 430 m (1,410 ft).
Period of record: 1972 to 2012, 41 years.
Eligible elements: 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 Rio Santiago. 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 Rio Santiago, 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)	7.8 C (46.0 F)	n/a	n/a
Feb	35.0 C (95.0 F)	7.8 C (46.0 F)	n/a	n/a
Mar	39.4 C (102.9 F)	8.3 C (46.9 F)	n/a	n/a
Apr	33.9 C (93.0 F)	10.0 C (50.0 F)	n/a	n/a
May	36.7 C (98.1 F)	11.7 C (53.1 F)	n/a	n/a
Jun	38.9 C (102.0 F)	10.6 C (51.1 F)	n/a	n/a
Jul	36.1 C (97.0 F)	11.7 C (53.1 F)	n/a	n/a
Aug	36.1 C (97.0 F)	10.6 C (51.1 F)	n/a	n/a
Sep	38.9 C (102.0 F)	11.7 C (53.1 F)	n/a	n/a
Oct	35.0 C (95.0 F)	11.7 C (53.1 F)	n/a	n/a
Nov	36.7 C (98.1 F)	10.0 C (50.0 F)	n/a	n/a
Dec	37.2 C (99.0 F)	10.0 C (50.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Rio Santiago still stand. 1990 holds the most, with 187.

Standing records at Rio Santiago by the year they were set
Year set	Standing records
1972	6
1973	47
1974	16
1975	19
1976	27
1977	10
1978	26
1979	30
1980	15
1981	57
1982	9
1983	46
1984	32
1985	47
1986	24
1987	12
1988	106
1990	187
1993	16
1994	100
1995	22
1996	113
1997	43
1998	83
1999	23
2000	6
2001	20
2002	50
2003	31
2004	29
2005	54
2006	25
2007	44
2009	46
2010	21
2011	3
2012	19

Wettest Day of Each Month

Jun: 183.9 mm (7.2 in)

The wettest day on record for each calendar month at Rio Santiago. The most was 183.9 mm (7.2 in) on 22 June 1973.

Record daily precipitation for each month at Rio Santiago
Month	Record daily precipitation (mm)	Date
Jan	52.3 mm (2.1 in)	24 January 1980
Feb	36.3 mm (1.4 in)	1 February 1992
Mar	15.0 mm (0.6 in)	28 March 2011
Apr	30.0 mm (1.2 in)	5 April 1973
May	92.5 mm (3.6 in)	30 May 1994
Jun	183.9 mm (7.2 in)	22 June 1973
Jul	126.5 mm (5.0 in)	6 July 1996
Aug	141.0 mm (5.6 in)	16 August 1988
Sep	150.4 mm (5.9 in)	13 September 1984
Oct	140.5 mm (5.5 in)	8 October 1996
Nov	133.4 mm (5.3 in)	29 November 1990
Dec	23.9 mm (0.9 in)	22 December 1978

Period of Record Coverage

1972 to 2012

38 years of record at Rio Santiago, 1972 to 2012. 21 years have data for under 90 percent of days and are left out of rankings: 1972, 1974, 1975, 1976, 1977, 1978, 1979, 1980 and others.

Days with data per year at Rio Santiago
Year	Days with data	Share of year	Complete
1972	15	4%	No
1973	365	100%	Yes
1974	151	41%	No
1975	151	41%	No
1976	117	32%	No
1977	121	33%	No
1978	199	55%	No
1979	181	50%	No
1980	117	32%	No
1981	353	97%	Yes
1982	295	81%	No
1983	319	87%	No
1984	238	65%	No
1985	190	52%	No
1986	243	67%	No
1987	255	70%	No
1988	366	100%	Yes
1989	6	2%	No
1990	249	68%	No
1993	254	70%	No
1994	365	100%	Yes
1995	365	100%	Yes
1996	366	100%	Yes
1997	273	75%	No
1998	365	100%	Yes
1999	334	92%	Yes
2000	366	100%	Yes
2001	365	100%	Yes
2002	365	100%	Yes
2003	363	99%	Yes
2004	335	92%	Yes
2005	365	100%	Yes
2006	243	67%	No
2007	334	92%	Yes
2009	334	92%	Yes
2010	334	92%	Yes
2011	122	33%	No
2012	213	58%	No

Latest Records

Latest records at Rio Santiago
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
6 September 2012	Rio Santiago, MX	daily rain	61.0 mm (2.4 in)	15.0 mm (0.6 in)	7 years	14 of 100 (Routine)
5 September 2012	Rio Santiago, MX	daily rain	57.9 mm (2.3 in)	7.1 mm (0.28 in)	5 years	8 of 100 (Routine)
15 June 2012	Rio Santiago, MX	daily rain	61.0 mm (2.4 in)	13.2 mm (0.5 in)	24 years	17 of 100 (Routine)
14 May 2012	Rio Santiago, MX	daily rain	2.8 mm (0.11 in)	2.8 mm (0.11 in)	39 years	17 of 100 (Routine)
21 January 2012	Rio Santiago, MX	daily rain	3.8 mm (0.15 in)	3.8 mm (0.15 in)	38 years	18 of 100 (Routine)
10 October 2011	Rio Santiago, MX	daily rain	55.9 mm (2.2 in)	33.0 mm (1.3 in)	5 years	23 of 100 (Routine)
4 October 2011	Rio Santiago, MX	daily rain	61.0 mm (2.4 in)	14.5 mm (0.6 in)	16 years	16 of 100 (Routine)
5 September 2011	Rio Santiago, MX	daily rain (Tie)	50.8 mm (2.0 in)	tie	4 years	1 of 100 (Routine)
28 August 2011	Rio Santiago, MX	daily rain	62.0 mm (2.4 in)	12.2 mm (0.5 in)	29 years	18 of 100 (Routine)
17 August 2011	Rio Santiago, MX	daily rain	61.0 mm (2.4 in)	23.2 mm (0.9 in)	9 years	18 of 100 (Routine)
28 July 2011	Rio Santiago, MX	daily rain	61.0 mm (2.4 in)	11.7 mm (0.5 in)	16 years	15 of 100 (Routine)
27 July 2011	Rio Santiago, MX	daily rain	37.8 mm (1.5 in)	9.9 mm (0.39 in)	8 years	11 of 100 (Routine)
26 July 2011	Rio Santiago, MX	daily rain	57.9 mm (2.3 in)	5.1 mm (0.20 in)	4 years	8 of 100 (Routine)
12 July 2011	Rio Santiago, MX	daily rain	50.8 mm (2.0 in)	0.3 mm (0.01 in)	26 years	12 of 100 (Routine)
28 March 2011	Rio Santiago, MX	monthly rain	15.0 mm (0.6 in)	10.2 mm (0.4 in)	26 years	20 of 100 (Routine)
13 July 2010	Rio Santiago, MX	daily rain	31.0 mm (1.2 in)	10.2 mm (0.4 in)	1 year	8 of 100 (Routine)
15 January 2010	Rio Santiago, MX	daily rain	16.8 mm (0.7 in)	3.8 mm (0.15 in)	6 years	7 of 100 (Routine)
4 January 2010	Rio Santiago, MX	daily rain	11.9 mm (0.5 in)	8.1 mm (0.32 in)	30 years	18 of 100 (Routine)
17 October 2009	Rio Santiago, MX	daily rain	53.8 mm (2.1 in)	30.9 mm (1.2 in)	2 years	20 of 100 (Routine)
6 August 2009	Rio Santiago, MX	daily rain	35.8 mm (1.4 in)	7.9 mm (0.31 in)	6 years	8 of 100 (Routine)

Climate Trend

11 complete years, 1973 to 2005

One stripe for each of 11 complete years at Rio Santiago, 1973 to 2005. Blue stripes are years cooler than the station's own mean of 23.4 C (74.1 F); red stripes are warmer. The coolest year was 2005, at 21.6 C (70.8 F), and the warmest was 1988, at 25.5 C (78.0 F). The strongest colour marks a difference of 2.2 C (4.0 F).

Annual mean temperature at Rio Santiago as warming stripes, 1973 to 2005
Year	Annual mean temperature	Difference from the station mean
1973	22.5 C	-0.93 C
1988	25.5 C	+2.14 C
1994	24.9 C	+1.55 C
1995	24.5 C	+1.06 C
1996	25.2 C	+1.84 C
1998	22.5 C	-0.94 C
2000	23.2 C	-0.21 C
2001	23.2 C	-0.19 C
2002	22.5 C	-0.94 C
2003	21.9 C	-1.54 C
2005	21.6 C	-1.84 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

1972 to 2012

Yearly extremes at Rio Santiago: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	39.4 C (102.9 F)	1990	33.9 C (93.0 F)	38
Coldest night (TNn)	7.8 C (46.0 F)	1973	11.7 C (53.1 F)	38
Wettest day (Rx1day)	183.9 mm (7.2 in)	1973	58.9 mm (2.3 in)	41
Wettest five days (Rx5day)	312.3 mm (12.3 in)	1976	150.1 mm (5.9 in)	41
Longest dry spell (CDD)	184 days	2001	100 days	41

Hottest day (TXx)

The hottest day of the year at Rio Santiago, 1972 to 2012. The record is 39.4 C (102.9 F) in 1990, marked on the chart; the median year is 33.9 C (93.0 F).

Hottest day (TXx) at Rio Santiago by year
Year	Hottest day (TXx)
1972	30.6 C (87.1 F)
1973	35.0 C (95.0 F)
1974	31.7 C (89.1 F)
1975	33.9 C (93.0 F)
1976	36.7 C (98.1 F)
1977	32.8 C (91.0 F)
1978	33.9 C (93.0 F)
1979	38.9 C (102.0 F)
1980	33.9 C (93.0 F)
1981	35.0 C (95.0 F)
1982	33.9 C (93.0 F)
1983	33.3 C (91.9 F)
1984	35.0 C (95.0 F)
1985	33.9 C (93.0 F)
1986	33.3 C (91.9 F)
1987	31.7 C (89.1 F)
1988	35.0 C (95.0 F)
1989	31.1 C (88.0 F)
1990	39.4 C (102.9 F)
1991	n/a
1992	n/a
1993	32.2 C (90.0 F)
1994	36.1 C (97.0 F)
1995	33.3 C (91.9 F)
1996	34.4 C (93.9 F)
1997	36.7 C (98.1 F)
1998	36.7 C (98.1 F)
1999	33.3 C (91.9 F)
2000	35.6 C (96.1 F)
2001	35.0 C (95.0 F)
2002	33.9 C (93.0 F)
2003	33.9 C (93.0 F)
2004	31.7 C (89.1 F)
2005	32.8 C (91.0 F)
2006	31.7 C (89.1 F)
2007	33.9 C (93.0 F)
2008	n/a
2009	32.8 C (91.0 F)
2010	32.8 C (91.0 F)
2011	31.7 C (89.1 F)
2012	31.7 C (89.1 F)

Coldest night (TNn)

The coldest night of the year at Rio Santiago, 1972 to 2012. The record is 7.8 C (46.0 F) in 1973, marked on the chart; the median year is 11.7 C (53.1 F).

Coldest night (TNn) at Rio Santiago by year
Year	Coldest night (TNn)
1972	10.0 C (50.0 F)
1973	7.8 C (46.0 F)
1974	7.8 C (46.0 F)
1975	7.8 C (46.0 F)
1976	8.9 C (48.0 F)
1977	10.0 C (50.0 F)
1978	8.9 C (48.0 F)
1979	10.0 C (50.0 F)
1980	10.0 C (50.0 F)
1981	7.8 C (46.0 F)
1982	10.6 C (51.1 F)
1983	8.3 C (46.9 F)
1984	10.0 C (50.0 F)
1985	10.0 C (50.0 F)
1986	15.0 C (59.0 F)
1987	15.0 C (59.0 F)
1988	15.0 C (59.0 F)
1989	17.8 C (64.0 F)
1990	11.7 C (53.1 F)
1991	n/a
1992	n/a
1993	15.0 C (59.0 F)
1994	12.8 C (55.0 F)
1995	16.7 C (62.1 F)
1996	16.1 C (61.0 F)
1997	11.7 C (53.1 F)
1998	11.7 C (53.1 F)
1999	13.9 C (57.0 F)
2000	13.9 C (57.0 F)
2001	12.8 C (55.0 F)
2002	11.7 C (53.1 F)
2003	11.7 C (53.1 F)
2004	11.7 C (53.1 F)
2005	10.0 C (50.0 F)
2006	10.0 C (50.0 F)
2007	10.0 C (50.0 F)
2008	n/a
2009	11.7 C (53.1 F)
2010	11.7 C (53.1 F)
2011	13.9 C (57.0 F)
2012	11.7 C (53.1 F)

Wettest day (Rx1day)

The wettest day of the year at Rio Santiago, 1972 to 2012. The record is 183.9 mm (7.2 in) in 1973, marked on the chart; the median year is 58.9 mm (2.3 in).

Wettest day (Rx1day) at Rio Santiago by year
Year	Wettest day (Rx1day)
1972	0.0 mm (0.00 in)
1973	183.9 mm (7.2 in)
1974	4.8 mm (0.19 in)
1975	47.2 mm (1.9 in)
1976	123.4 mm (4.9 in)
1977	8.4 mm (0.33 in)
1978	79.8 mm (3.1 in)
1979	40.9 mm (1.6 in)
1980	52.3 mm (2.1 in)
1981	99.8 mm (3.9 in)
1982	71.1 mm (2.8 in)
1983	55.4 mm (2.2 in)
1984	150.4 mm (5.9 in)
1985	45.0 mm (1.8 in)
1986	75.4 mm (3.0 in)
1987	120.4 mm (4.7 in)
1988	141.0 mm (5.6 in)
1989	31.8 mm (1.3 in)
1990	134.4 mm (5.3 in)
1991	119.9 mm (4.7 in)
1992	78.0 mm (3.1 in)
1993	20.8 mm (0.8 in)
1994	92.5 mm (3.6 in)
1995	105.4 mm (4.1 in)
1996	140.5 mm (5.5 in)
1997	21.8 mm (0.9 in)
1998	31.0 mm (1.2 in)
1999	0.8 mm (0.03 in)
2000	20.8 mm (0.8 in)
2001	61.0 mm (2.4 in)
2002	37.8 mm (1.5 in)
2003	50.8 mm (2.0 in)
2004	31.0 mm (1.2 in)
2005	52.8 mm (2.1 in)
2006	67.8 mm (2.7 in)
2007	63.0 mm (2.5 in)
2008	40.9 mm (1.6 in)
2009	58.9 mm (2.3 in)
2010	40.9 mm (1.6 in)
2011	71.9 mm (2.8 in)
2012	61.0 mm (2.4 in)

Wettest five days (Rx5day)

The wettest five days of the year at Rio Santiago, 1972 to 2012. The record is 312.3 mm (12.3 in) in 1976, marked on the chart; the median year is 150.1 mm (5.9 in).

Wettest five days (Rx5day) at Rio Santiago by year
Year	Wettest five days (Rx5day)
1972	0.0 mm (0.00 in)
1973	239.2 mm (9.4 in)
1974	4.8 mm (0.19 in)
1975	101.9 mm (4.0 in)
1976	312.3 mm (12.3 in)
1977	8.4 mm (0.33 in)
1978	135.9 mm (5.4 in)
1979	59.4 mm (2.3 in)
1980	124.5 mm (4.9 in)
1981	249.4 mm (9.8 in)
1982	119.9 mm (4.7 in)
1983	150.1 mm (5.9 in)
1984	175.8 mm (6.9 in)
1985	92.0 mm (3.6 in)
1986	111.0 mm (4.4 in)
1987	150.1 mm (5.9 in)
1988	274.9 mm (10.8 in)
1989	67.3 mm (2.6 in)
1990	190.6 mm (7.5 in)
1991	269.8 mm (10.6 in)
1992	189.3 mm (7.5 in)
1993	91.1 mm (3.6 in)
1994	168.6 mm (6.6 in)
1995	205.3 mm (8.1 in)
1996	299.8 mm (11.8 in)
1997	92.2 mm (3.6 in)
1998	107.6 mm (4.2 in)
1999	0.8 mm (0.03 in)
2000	73.4 mm (2.9 in)
2001	190.0 mm (7.5 in)
2002	116.2 mm (4.6 in)
2003	173.3 mm (6.8 in)
2004	86.1 mm (3.4 in)
2005	213.4 mm (8.4 in)
2006	217.7 mm (8.6 in)
2007	205.5 mm (8.1 in)
2008	129.6 mm (5.1 in)
2009	162.2 mm (6.4 in)
2010	124.5 mm (4.9 in)
2011	239.6 mm (9.4 in)
2012	202.5 mm (8.0 in)

Longest dry spell (CDD)

The longest dry spell of the year at Rio Santiago, 1972 to 2012. The record is 184 days in 2001, marked on the chart; the median year is 100 days.

Longest dry spell (CDD) at Rio Santiago by year
Year	Longest dry spell (CDD)
1972	16 days
1973	94 days
1974	92 days
1975	59 days
1976	26 days
1977	90 days
1978	40 days
1979	109 days
1980	58 days
1981	79 days
1982	102 days
1983	86 days
1984	96 days
1985	43 days
1986	103 days
1987	44 days
1988	149 days
1989	140 days
1990	114 days
1991	148 days
1992	118 days
1993	90 days
1994	124 days
1995	91 days
1996	136 days
1997	131 days
1998	165 days
1999	151 days
2000	141 days
2001	184 days
2002	113 days
2003	98 days
2004	86 days
2005	97 days
2006	150 days
2007	98 days
2008	123 days
2009	136 days
2010	152 days
2011	86 days
2012	100 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 Rio Santiago standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Rio Santiago 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 2026-10-15 (15 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).