Rancho Seco Weather Records (MXN00001081)

Record envelope, standing records and threshold days for Rancho Seco (MXN00001081), Mexico, with 35 years of record.

Key Facts for Rancho Seco

Rancho Seco (MXN00001081) is a weather station in Mexico at 22.08 latitude and -101.97 longitude, 2,067 m (6,782 ft) above sea level.
The station reports from 1979 to 2013, 35 years of record.
1,464 records set at Rancho Seco still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Rancho Seco set a daily record precipitation of 40.1 mm (1.6 in) on 20 July 2013.

About the Station

Location: Mexico, 22.08 latitude, -101.97 longitude.
Elevation: 2,067 m (6,782 ft).
Period of record: 1979 to 2013, 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 Rancho Seco. 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 Rancho Seco, 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)	-6.1 C (21.0 F)	n/a	n/a
Feb	30.0 C (86.0 F)	-5.0 C (23.0 F)	n/a	n/a
Mar	34.4 C (93.9 F)	-1.7 C (28.9 F)	n/a	n/a
Apr	35.0 C (95.0 F)	1.1 C (34.0 F)	n/a	n/a
May	37.2 C (99.0 F)	2.2 C (36.0 F)	n/a	n/a
Jun	35.0 C (95.0 F)	6.7 C (44.1 F)	n/a	n/a
Jul	35.6 C (96.1 F)	6.7 C (44.1 F)	n/a	n/a
Aug	35.6 C (96.1 F)	2.8 C (37.0 F)	n/a	n/a
Sep	35.0 C (95.0 F)	0.6 C (33.1 F)	n/a	n/a
Oct	32.2 C (90.0 F)	0.0 C (32.0 F)	n/a	n/a
Nov	31.7 C (89.1 F)	-5.0 C (23.0 F)	n/a	n/a
Dec	31.1 C (88.0 F)	-8.3 C (17.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Rancho Seco still stand. 1998 holds the most, with 143.

Standing records at Rancho Seco by the year they were set
Year set	Standing records
1979	7
1980	72
1981	37
1982	43
1983	60
1984	50
1985	33
1986	102
1987	52
1988	48
1989	89
1990	11
1991	21
1992	29
1993	20
1994	8
1995	37
1996	24
1997	53
1998	143
1999	37
2000	48
2001	94
2002	29
2003	40
2004	34
2005	30
2006	38
2007	16
2008	33
2009	37
2010	35
2011	22
2012	18
2013	14

Wettest Day of Each Month

Jul: 112.0 mm (4.4 in)

The wettest day on record for each calendar month at Rancho Seco. The most was 112.0 mm (4.4 in) on 26 July 2006.

Record daily precipitation for each month at Rancho Seco
Month	Record daily precipitation (mm)	Date
Jan	52.6 mm (2.1 in)	1 January 2013
Feb	35.3 mm (1.4 in)	3 February 2010
Mar	17.0 mm (0.7 in)	30 March 2004
Apr	26.7 mm (1.1 in)	23 April 1996
May	48.8 mm (1.9 in)	12 May 2001
Jun	79.8 mm (3.1 in)	14 June 2013
Jul	112.0 mm (4.4 in)	26 July 2006
Aug	88.9 mm (3.5 in)	31 August 2001
Sep	59.4 mm (2.3 in)	4 September 2003
Oct	47.8 mm (1.9 in)	9 October 1992
Nov	22.4 mm (0.9 in)	3 November 2002
Dec	14.0 mm (0.6 in)	13 December 1982

Period of Record Coverage

1979 to 2013

35 years of record at Rancho Seco, 1979 to 2013. 6 years have data for under 90 percent of days and are left out of rankings: 1979, 1985, 1986, 1990, 1991, 2013.

Days with data per year at Rancho Seco
Year	Days with data	Share of year	Complete
1979	92	25%	No
1980	366	100%	Yes
1981	365	100%	Yes
1982	365	100%	Yes
1983	365	100%	Yes
1984	365	100%	Yes
1985	212	58%	No
1986	321	88%	No
1987	365	100%	Yes
1988	366	100%	Yes
1989	365	100%	Yes
1990	99	27%	No
1991	275	75%	No
1992	366	100%	Yes
1993	365	100%	Yes
1994	365	100%	Yes
1995	335	92%	Yes
1996	366	100%	Yes
1997	365	100%	Yes
1998	365	100%	Yes
1999	365	100%	Yes
2000	366	100%	Yes
2001	365	100%	Yes
2002	365	100%	Yes
2003	365	100%	Yes
2004	366	100%	Yes
2005	365	100%	Yes
2006	365	100%	Yes
2007	365	100%	Yes
2008	365	100%	Yes
2009	364	100%	Yes
2010	365	100%	Yes
2011	358	98%	Yes
2012	366	100%	Yes
2013	212	58%	No

Latest Records

Latest records at Rancho Seco
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
20 July 2013	Rancho Seco, MX	daily rain	40.1 mm (1.6 in)	15.2 mm (0.6 in)	22 years	20 of 100 (Routine)
20 July 2013	Rancho Seco, MX	daily high min (Tie)	15.0 C (59.0 F)	tie	31 years	3 of 100 (Routine)
16 July 2013	Rancho Seco, MX	daily high min (Tie)	15.6 C (60.1 F)	tie	12 years	1 of 100 (Routine)
15 July 2013	Rancho Seco, MX	daily high min (Tie)	15.0 C (59.0 F)	tie	31 years	3 of 100 (Routine)
7 July 2013	Rancho Seco, MX	daily rain	12.2 mm (0.5 in)	0.3 mm (0.01 in)	23 years	9 of 100 (Routine)
6 July 2013	Rancho Seco, MX	daily high min (Tie)	15.0 C (59.0 F)	tie	31 years	3 of 100 (Routine)
24 June 2013	Rancho Seco, MX	daily low max	20.0 C (68.0 F)	1.7 C (3.1 F)	20 years	14 of 100 (Routine)
16 June 2013	Rancho Seco, MX	daily high min	16.1 C (61.0 F)	0.5 C (0.9 F)	12 years	8 of 100 (Routine)
14 June 2013	Rancho Seco, MX	monthly rain	79.8 mm (3.1 in)	8.4 mm (0.33 in)	14 years	24 of 100 (Routine)
6 June 2013	Rancho Seco, MX	daily high min	16.1 C (61.0 F)	0.5 C (0.9 F)	22 years	11 of 100 (Routine)
1 June 2013	Rancho Seco, MX	daily high min (Tie)	15.0 C (59.0 F)	tie	12 years	1 of 100 (Routine)
31 May 2013	Rancho Seco, MX	daily high min	16.7 C (62.1 F)	1.1 C (2.0 F)	12 years	10 of 100 (Routine)
24 May 2013	Rancho Seco, MX	daily rain	10.2 mm (0.4 in)	5.6 mm (0.22 in)	12 years	15 of 100 (Routine)
24 May 2013	Rancho Seco, MX	daily high min (Tie)	15.0 C (59.0 F)	tie	18 years	2 of 100 (Routine)
20 May 2013	Rancho Seco, MX	daily high min	16.1 C (61.0 F)	0.5 C (0.9 F)	18 years	10 of 100 (Routine)
14 May 2013	Rancho Seco, MX	daily rain	9.4 mm (0.37 in)	2.5 mm (0.10 in)	11 years	10 of 100 (Routine)
13 May 2013	Rancho Seco, MX	daily rain	7.9 mm (0.31 in)	2.1 mm (0.08 in)	20 years	12 of 100 (Routine)
27 April 2013	Rancho Seco, MX	daily high min	13.9 C (57.0 F)	0.6 C (1.1 F)	7 years	7 of 100 (Routine)
20 April 2013	Rancho Seco, MX	daily low min (Tie)	5.0 C (41.0 F)	tie	15 years	1 of 100 (Routine)
14 April 2013	Rancho Seco, MX	daily low min	3.9 C (39.0 F)	1.1 C (2.0 F)	28 years	15 of 100 (Routine)

Climate Trend

28 complete years, 1980 to 2012

One stripe for each of 28 complete years at Rancho Seco, 1980 to 2012. Blue stripes are years cooler than the station's own mean of 17.0 C (62.6 F); red stripes are warmer. The coolest year was 1998, at 14.5 C (58.0 F), and the warmest was 2003, at 18.0 C (64.4 F). The strongest colour marks a difference of 2.6 C (4.7 F).

Annual mean temperature at Rancho Seco as warming stripes, 1980 to 2012
Year	Annual mean temperature	Difference from the station mean
1980	17.9 C	+0.84 C
1981	17.0 C	-0.05 C
1982	17.9 C	+0.91 C
1983	16.1 C	-0.89 C
1984	16.3 C	-0.71 C
1987	15.9 C	-1.10 C
1988	15.7 C	-1.31 C
1989	15.1 C	-1.95 C
1992	16.9 C	-0.17 C
1993	16.9 C	-0.11 C
1994	17.7 C	+0.68 C
1996	17.0 C	+0.00 C
1997	16.8 C	-0.19 C
1998	14.5 C	-2.55 C
1999	16.8 C	-0.23 C
2000	16.7 C	-0.30 C
2001	17.9 C	+0.89 C
2002	17.8 C	+0.77 C
2003	18.0 C	+0.96 C
2004	17.1 C	+0.07 C
2005	17.6 C	+0.61 C
2006	17.7 C	+0.65 C
2007	17.6 C	+0.56 C
2008	17.2 C	+0.21 C
2009	17.9 C	+0.90 C
2010	17.0 C	-0.07 C
2011	17.9 C	+0.90 C
2012	17.7 C	+0.64 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 2013

Yearly extremes at Rancho Seco: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	37.2 C (99.0 F)	1995	33.9 C (93.0 F)	35
Coldest night (TNn)	-8.3 C (17.1 F)	1997	-2.2 C (28.0 F)	35
Wettest day (Rx1day)	112.0 mm (4.4 in)	2006	45.2 mm (1.8 in)	35
Wettest five days (Rx5day)	202.8 mm (8.0 in)	2001	66.6 mm (2.6 in)	35
Longest dry spell (CDD)	178 days	1982	90 days	35

Hottest day (TXx)

The hottest day of the year at Rancho Seco, 1979 to 2013. The record is 37.2 C (99.0 F) in 1995, marked on the chart; the median year is 33.9 C (93.0 F).

Hottest day (TXx) at Rancho Seco by year
Year	Hottest day (TXx)
1979	31.1 C (88.0 F)
1980	35.0 C (95.0 F)
1981	31.1 C (88.0 F)
1982	33.3 C (91.9 F)
1983	32.2 C (90.0 F)
1984	35.0 C (95.0 F)
1985	33.9 C (93.0 F)
1986	31.7 C (89.1 F)
1987	31.7 C (89.1 F)
1988	31.7 C (89.1 F)
1989	33.9 C (93.0 F)
1990	32.8 C (91.0 F)
1991	33.9 C (93.0 F)
1992	32.8 C (91.0 F)
1993	32.8 C (91.0 F)
1994	32.8 C (91.0 F)
1995	37.2 C (99.0 F)
1996	35.0 C (95.0 F)
1997	35.0 C (95.0 F)
1998	32.8 C (91.0 F)
1999	35.6 C (96.1 F)
2000	33.9 C (93.0 F)
2001	35.6 C (96.1 F)
2002	33.9 C (93.0 F)
2003	35.0 C (95.0 F)
2004	32.8 C (91.0 F)
2005	34.4 C (93.9 F)
2006	32.2 C (90.0 F)
2007	33.3 C (91.9 F)
2008	35.0 C (95.0 F)
2009	33.9 C (93.0 F)
2010	35.0 C (95.0 F)
2011	35.0 C (95.0 F)
2012	33.9 C (93.0 F)
2013	32.8 C (91.0 F)

Coldest night (TNn)

The coldest night of the year at Rancho Seco, 1979 to 2013. The record is -8.3 C (17.1 F) in 1997, marked on the chart; the median year is -2.2 C (28.0 F).

Coldest night (TNn) at Rancho Seco by year
Year	Coldest night (TNn)
1979	-2.2 C (28.0 F)
1980	0.6 C (33.1 F)
1981	-2.2 C (28.0 F)
1982	0.6 C (33.1 F)
1983	-2.2 C (28.0 F)
1984	0.6 C (33.1 F)
1985	-6.1 C (21.0 F)
1986	-1.1 C (30.0 F)
1987	-3.3 C (26.1 F)
1988	-5.0 C (23.0 F)
1989	2.8 C (37.0 F)
1990	2.8 C (37.0 F)
1991	0.0 C (32.0 F)
1992	0.0 C (32.0 F)
1993	-1.1 C (30.0 F)
1994	-1.1 C (30.0 F)
1995	-3.3 C (26.1 F)
1996	-2.2 C (28.0 F)
1997	-8.3 C (17.1 F)
1998	-5.0 C (23.0 F)
1999	-2.2 C (28.0 F)
2000	-3.3 C (26.1 F)
2001	-3.3 C (26.1 F)
2002	-1.1 C (30.0 F)
2003	-4.4 C (24.1 F)
2004	-5.0 C (23.0 F)
2005	0.0 C (32.0 F)
2006	-6.1 C (21.0 F)
2007	0.0 C (32.0 F)
2008	-2.2 C (28.0 F)
2009	-1.1 C (30.0 F)
2010	-2.2 C (28.0 F)
2011	-5.0 C (23.0 F)
2012	0.0 C (32.0 F)
2013	-1.7 C (28.9 F)

Wettest day (Rx1day)

The wettest day of the year at Rancho Seco, 1979 to 2013. The record is 112.0 mm (4.4 in) in 2006, marked on the chart; the median year is 45.2 mm (1.8 in).

Wettest day (Rx1day) at Rancho Seco by year
Year	Wettest day (Rx1day)
1979	11.9 mm (0.5 in)
1980	7.4 mm (0.29 in)
1981	3.8 mm (0.15 in)
1982	31.5 mm (1.2 in)
1983	39.4 mm (1.6 in)
1984	33.8 mm (1.3 in)
1985	8.9 mm (0.35 in)
1986	2.8 mm (0.11 in)
1987	16.5 mm (0.6 in)
1988	7.9 mm (0.31 in)
1989	7.9 mm (0.31 in)
1990	55.9 mm (2.2 in)
1991	83.8 mm (3.3 in)
1992	58.9 mm (2.3 in)
1993	35.6 mm (1.4 in)
1994	46.0 mm (1.8 in)
1995	38.9 mm (1.5 in)
1996	46.0 mm (1.8 in)
1997	45.2 mm (1.8 in)
1998	71.4 mm (2.8 in)
1999	29.0 mm (1.1 in)
2000	63.2 mm (2.5 in)
2001	88.9 mm (3.5 in)
2002	48.3 mm (1.9 in)
2003	59.4 mm (2.3 in)
2004	48.8 mm (1.9 in)
2005	30.2 mm (1.2 in)
2006	112.0 mm (4.4 in)
2007	46.7 mm (1.8 in)
2008	71.9 mm (2.8 in)
2009	47.8 mm (1.9 in)
2010	53.3 mm (2.1 in)
2011	37.3 mm (1.5 in)
2012	37.1 mm (1.5 in)
2013	79.8 mm (3.1 in)

Wettest five days (Rx5day)

The wettest five days of the year at Rancho Seco, 1979 to 2013. The record is 202.8 mm (8.0 in) in 2001, marked on the chart; the median year is 66.6 mm (2.6 in).

Wettest five days (Rx5day) at Rancho Seco by year
Year	Wettest five days (Rx5day)
1979	16.1 mm (0.6 in)
1980	9.7 mm (0.38 in)
1981	6.4 mm (0.25 in)
1982	65.5 mm (2.6 in)
1983	54.4 mm (2.1 in)
1984	85.1 mm (3.4 in)
1985	13.2 mm (0.5 in)
1986	10.0 mm (0.4 in)
1987	26.7 mm (1.1 in)
1988	13.5 mm (0.5 in)
1989	10.7 mm (0.4 in)
1990	112.5 mm (4.4 in)
1991	172.5 mm (6.8 in)
1992	91.0 mm (3.6 in)
1993	55.1 mm (2.2 in)
1994	125.8 mm (5.0 in)
1995	73.7 mm (2.9 in)
1996	66.6 mm (2.6 in)
1997	51.3 mm (2.0 in)
1998	103.1 mm (4.1 in)
1999	42.0 mm (1.7 in)
2000	73.5 mm (2.9 in)
2001	202.8 mm (8.0 in)
2002	89.2 mm (3.5 in)
2003	65.0 mm (2.6 in)
2004	113.6 mm (4.5 in)
2005	55.1 mm (2.2 in)
2006	158.5 mm (6.2 in)
2007	83.3 mm (3.3 in)
2008	147.6 mm (5.8 in)
2009	52.9 mm (2.1 in)
2010	138.6 mm (5.5 in)
2011	55.8 mm (2.2 in)
2012	79.1 mm (3.1 in)
2013	106.8 mm (4.2 in)

Longest dry spell (CDD)

The longest dry spell of the year at Rancho Seco, 1979 to 2013. The record is 178 days in 1982, marked on the chart; the median year is 90 days.

Longest dry spell (CDD) at Rancho Seco by year
Year	Longest dry spell (CDD)
1979	62 days
1980	120 days
1981	130 days
1982	178 days
1983	124 days
1984	97 days
1985	53 days
1986	85 days
1987	80 days
1988	107 days
1989	145 days
1990	62 days
1991	84 days
1992	38 days
1993	103 days
1994	87 days
1995	90 days
1996	113 days
1997	57 days
1998	159 days
1999	137 days
2000	77 days
2001	76 days
2002	89 days
2003	133 days
2004	47 days
2005	69 days
2006	86 days
2007	56 days
2008	108 days
2009	78 days
2010	96 days
2011	105 days
2012	124 days
2013	128 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.

Rainfall Return Levels

32 years, 1980 to 2012

A day with at least 40.2 mm (1.6 in) of rain is expected about once in 2 years. A day with at least 111.3 mm (4.4 in) of rain is expected about once in 100 years.

Rainfall return levels at Rancho Seco: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	40.2 mm (1.6 in)
5 years	63.6 mm (2.5 in)
10 years	77.2 mm (3.0 in)
25 years	92.3 mm (3.6 in)
50 years	102.3 mm (4.0 in)	Longer than the 32 years of record
100 years	111.3 mm (4.4 in)	Longer than the 32 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 32 years of values from 1980 to 2012.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 112.0 mm (4.4 in) in 2006; 88.9 mm (3.5 in) in 2001; 83.8 mm (3.3 in) in 1991.

Download the Data

Data for Rancho Seco standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Rancho Seco 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).