Presa Las Ruinas Weather Records (MXN00015075)

Record envelope, standing records and threshold days for Presa Las Ruinas (MXN00015075), Mexico, with 44 years of record.

Key Facts for Presa Las Ruinas

Presa Las Ruinas (MXN00015075) is a weather station in Mexico at 19.57 latitude and -99.27 longitude, 2,360 m (7,742 ft) above sea level.
The station reports from 1969 to 2012, 44 years of record.
1,464 records set at Presa Las Ruinas still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Presa Las Ruinas set a daily record precipitation of 3.3 mm (0.13 in) on 4 November 2012.

About the Station

Location: Mexico, 19.57 latitude, -99.27 longitude.
Elevation: 2,360 m (7,742 ft).
Period of record: 1969 to 2012, 44 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 Presa Las Ruinas. 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 Presa Las Ruinas, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	26.1 C (79.0 F)	-3.3 C (26.1 F)	n/a	n/a
Feb	28.9 C (84.0 F)	-5.6 C (21.9 F)	n/a	n/a
Mar	32.8 C (91.0 F)	-3.3 C (26.1 F)	n/a	n/a
Apr	33.9 C (93.0 F)	0.6 C (33.1 F)	n/a	n/a
May	35.6 C (96.1 F)	0.0 C (32.0 F)	n/a	n/a
Jun	32.8 C (91.0 F)	1.7 C (35.1 F)	n/a	n/a
Jul	30.0 C (86.0 F)	2.8 C (37.0 F)	n/a	n/a
Aug	30.0 C (86.0 F)	2.8 C (37.0 F)	n/a	n/a
Sep	30.0 C (86.0 F)	0.0 C (32.0 F)	n/a	n/a
Oct	29.4 C (84.9 F)	-3.3 C (26.1 F)	n/a	n/a
Nov	27.8 C (82.0 F)	-5.0 C (23.0 F)	n/a	n/a
Dec	26.7 C (80.1 F)	-3.9 C (25.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Presa Las Ruinas still stand. 1983 holds the most, with 89.

Standing records at Presa Las Ruinas by the year they were set
Year set	Standing records
1977	38
1978	39
1979	78
1980	79
1981	58
1982	52
1983	89
1984	62
1985	50
1986	32
1987	67
1988	59
1993	55
1995	24
1996	43
1997	61
1998	77
1999	27
2001	27
2002	36
2003	27
2004	41
2005	45
2006	43
2007	20
2008	14
2009	55
2010	40
2011	57
2012	69

Wettest Day of Each Month

Jul: 76.5 mm (3.0 in)

The wettest day on record for each calendar month at Presa Las Ruinas. The most was 76.5 mm (3.0 in) on 2 July 1984.

Record daily precipitation for each month at Presa Las Ruinas
Month	Record daily precipitation (mm)	Date
Jan	20.3 mm (0.8 in)	17 January 1981
Feb	21.8 mm (0.9 in)	3 February 2010
Mar	27.4 mm (1.1 in)	16 March 1978
Apr	41.7 mm (1.6 in)	16 April 1985
May	54.4 mm (2.1 in)	30 May 1981
Jun	74.9 mm (2.9 in)	28 June 1993
Jul	76.5 mm (3.0 in)	2 July 1984
Aug	75.9 mm (3.0 in)	28 August 2011
Sep	60.5 mm (2.4 in)	17 September 1998
Oct	59.9 mm (2.4 in)	18 October 1998
Nov	30.0 mm (1.2 in)	15 November 1993
Dec	14.0 mm (0.6 in)	2 December 1976

Period of Record Coverage

1977 to 2012

30 years of record at Presa Las Ruinas, 1977 to 2012. 5 years have data for under 90 percent of days and are left out of rankings: 1995, 2005, 2008, 2009, 2010.

Days with data per year at Presa Las Ruinas
Year	Days with data	Share of year	Complete
1977	334	92%	Yes
1978	363	99%	Yes
1979	360	99%	Yes
1980	360	98%	Yes
1981	363	99%	Yes
1982	362	99%	Yes
1983	360	99%	Yes
1984	360	98%	Yes
1985	354	97%	Yes
1986	362	99%	Yes
1987	363	99%	Yes
1988	365	100%	Yes
1993	365	100%	Yes
1995	120	33%	No
1996	335	92%	Yes
1997	365	100%	Yes
1998	365	100%	Yes
1999	364	100%	Yes
2001	364	100%	Yes
2002	364	100%	Yes
2003	365	100%	Yes
2004	366	100%	Yes
2005	304	83%	No
2006	334	92%	Yes
2007	365	100%	Yes
2008	301	82%	No
2009	214	59%	No
2010	243	67%	No
2011	365	100%	Yes
2012	366	100%	Yes

Latest Records

Latest records at Presa Las Ruinas
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
4 November 2012	Presa Las Ruinas, MX	daily rain	3.3 mm (0.13 in)	0.5 mm (0.02 in)	1 year	4 of 100 (Routine)
3 November 2012	Presa Las Ruinas, MX	daily rain	6.9 mm (0.27 in)	2.8 mm (0.11 in)	32 years	18 of 100 (Routine)
16 September 2012	Presa Las Ruinas, MX	daily rain	33.8 mm (1.3 in)	4.8 mm (0.19 in)	37 years	19 of 100 (Routine)
10 August 2012	Presa Las Ruinas, MX	daily rain	38.4 mm (1.5 in)	18.6 mm (0.7 in)	7 years	25 of 100 (Routine)
6 August 2012	Presa Las Ruinas, MX	daily rain	19.8 mm (0.8 in)	4.1 mm (0.16 in)	37 years	19 of 100 (Routine)
26 July 2012	Presa Las Ruinas, MX	daily rain	39.9 mm (1.6 in)	8.7 mm (0.34 in)	25 years	19 of 100 (Routine)
22 June 2012	Presa Las Ruinas, MX	daily rain	47.0 mm (1.9 in)	20.1 mm (0.8 in)	38 years	34 of 100 (Routine)
16 May 2012	Presa Las Ruinas, MX	daily rain	19.8 mm (0.8 in)	9.4 mm (0.37 in)	2 years	17 of 100 (Routine)
11 April 2012	Presa Las Ruinas, MX	daily rain	30.0 mm (1.2 in)	12.2 mm (0.5 in)	10 years	27 of 100 (Routine)
10 March 2012	Presa Las Ruinas, MX	daily rain	3.8 mm (0.15 in)	0.8 mm (0.03 in)	31 years	14 of 100 (Routine)
8 March 2012	Presa Las Ruinas, MX	daily rain (Tie)	5.8 mm (0.23 in)	tie	19 years	2 of 100 (Routine)
29 February 2012	Presa Las Ruinas, MX	daily rain	7.4 mm (0.29 in)	7.4 mm (0.29 in)	40 years	20 of 100 (Routine)
7 February 2012	Presa Las Ruinas, MX	daily rain	4.8 mm (0.19 in)	4.8 mm (0.19 in)	41 years	20 of 100 (Routine)
5 February 2012	Presa Las Ruinas, MX	daily rain	11.9 mm (0.5 in)	4.3 mm (0.17 in)	16 years	18 of 100 (Routine)
29 January 2012	Presa Las Ruinas, MX	daily rain	2.3 mm (0.09 in)	1.5 mm (0.06 in)	14 years	10 of 100 (Routine)
1 January 2012	Presa Las Ruinas, MX	daily rain	2.8 mm (0.11 in)	2.8 mm (0.11 in)	41 years	20 of 100 (Routine)
27 November 2011	Presa Las Ruinas, MX	daily rain	15.0 mm (0.6 in)	9.9 mm (0.39 in)	24 years	20 of 100 (Routine)
26 November 2011	Presa Las Ruinas, MX	daily rain	14.5 mm (0.6 in)	11.7 mm (0.5 in)	38 years	20 of 100 (Routine)
18 November 2011	Presa Las Ruinas, MX	daily rain	1.8 mm (0.07 in)	1.8 mm (0.07 in)	41 years	19 of 100 (Routine)
10 November 2011	Presa Las Ruinas, MX	daily rain	5.8 mm (0.23 in)	0.7 mm (0.03 in)	12 years	8 of 100 (Routine)

Climate Trend

22 complete years, 1978 to 2012

One stripe for each of 22 complete years at Presa Las Ruinas, 1978 to 2012. Blue stripes are years cooler than the station's own mean of 14.4 C (57.9 F); red stripes are warmer. The coolest year was 1993, at 12.8 C (55.1 F), and the warmest was 1998, at 15.7 C (60.3 F). The strongest colour marks a difference of 1.6 C (2.9 F).

Annual mean temperature at Presa Las Ruinas as warming stripes, 1978 to 2012
Year	Annual mean temperature	Difference from the station mean
1978	14.3 C	-0.12 C
1979	13.9 C	-0.51 C
1980	13.7 C	-0.67 C
1981	14.0 C	-0.40 C
1982	14.4 C	0.00 C
1983	14.3 C	-0.08 C
1984	13.7 C	-0.70 C
1985	13.5 C	-0.91 C
1986	14.2 C	-0.18 C
1987	14.4 C	-0.02 C
1988	13.8 C	-0.63 C
1993	12.8 C	-1.55 C
1997	15.6 C	+1.17 C
1998	15.7 C	+1.33 C
1999	14.5 C	+0.13 C
2001	14.9 C	+0.55 C
2002	15.3 C	+0.90 C
2003	15.4 C	+1.02 C
2004	15.5 C	+1.09 C
2007	15.2 C	+0.82 C
2011	14.6 C	+0.19 C
2012	13.0 C	-1.40 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

1969 to 2012

Yearly extremes at Presa Las Ruinas: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	35.6 C (96.1 F)	2010	30.6 C (87.1 F)	30
Coldest night (TNn)	-5.6 C (21.9 F)	1980	0.0 C (32.0 F)	30
Wettest day (Rx1day)	76.5 mm (3.0 in)	1984	49.1 mm (1.9 in)	38
Wettest five days (Rx5day)	171.4 mm (6.7 in)	2011	100.4 mm (4.0 in)	38
Longest dry spell (CDD)	128 days	1998	55 days	38

Hottest day (TXx)

The hottest day of the year at Presa Las Ruinas, 1969 to 2012. The record is 35.6 C (96.1 F) in 2010, marked on the chart; the median year is 30.6 C (87.1 F).

Hottest day (TXx) at Presa Las Ruinas by year
Year	Hottest day (TXx)
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	28.9 C (84.0 F)
1978	32.2 C (90.0 F)
1979	30.0 C (86.0 F)
1980	30.0 C (86.0 F)
1981	30.0 C (86.0 F)
1982	30.0 C (86.0 F)
1983	32.8 C (91.0 F)
1984	31.7 C (89.1 F)
1985	30.0 C (86.0 F)
1986	30.6 C (87.1 F)
1987	30.6 C (87.1 F)
1988	30.6 C (87.1 F)
1993	30.6 C (87.1 F)
1995	31.7 C (89.1 F)
1996	31.7 C (89.1 F)
1997	30.6 C (87.1 F)
1998	33.9 C (93.0 F)
1999	31.7 C (89.1 F)
2001	30.6 C (87.1 F)
2002	30.6 C (87.1 F)
2003	32.8 C (91.0 F)
2004	30.0 C (86.0 F)
2005	32.8 C (91.0 F)
2006	30.6 C (87.1 F)
2007	30.6 C (87.1 F)
2008	33.9 C (93.0 F)
2009	33.9 C (93.0 F)
2010	35.6 C (96.1 F)
2011	32.8 C (91.0 F)
2012	31.7 C (89.1 F)

Coldest night (TNn)

The coldest night of the year at Presa Las Ruinas, 1969 to 2012. The record is -5.6 C (21.9 F) in 1980, marked on the chart; the median year is 0.0 C (32.0 F).

Coldest night (TNn) at Presa Las Ruinas by year
Year	Coldest night (TNn)
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	0.0 C (32.0 F)
1978	0.0 C (32.0 F)
1979	0.0 C (32.0 F)
1980	-5.6 C (21.9 F)
1981	-3.3 C (26.1 F)
1982	0.0 C (32.0 F)
1983	-4.4 C (24.1 F)
1984	-2.2 C (28.0 F)
1985	-2.2 C (28.0 F)
1986	-1.1 C (30.0 F)
1987	0.0 C (32.0 F)
1988	0.0 C (32.0 F)
1993	0.0 C (32.0 F)
1995	0.0 C (32.0 F)
1996	0.0 C (32.0 F)
1997	0.0 C (32.0 F)
1998	0.0 C (32.0 F)
1999	-1.1 C (30.0 F)
2001	0.0 C (32.0 F)
2002	0.0 C (32.0 F)
2003	0.0 C (32.0 F)
2004	0.0 C (32.0 F)
2005	0.0 C (32.0 F)
2006	0.0 C (32.0 F)
2007	0.0 C (32.0 F)
2008	-3.3 C (26.1 F)
2009	2.8 C (37.0 F)
2010	-3.3 C (26.1 F)
2011	-5.0 C (23.0 F)
2012	-3.3 C (26.1 F)

Wettest day (Rx1day)

The wettest day of the year at Presa Las Ruinas, 1969 to 2012. The record is 76.5 mm (3.0 in) in 1984, marked on the chart; the median year is 49.1 mm (1.9 in).

Wettest day (Rx1day) at Presa Las Ruinas by year
Year	Wettest day (Rx1day)
1969	49.8 mm (2.0 in)
1970	52.8 mm (2.1 in)
1971	33.8 mm (1.3 in)
1972	67.8 mm (2.7 in)
1973	26.9 mm (1.1 in)
1974	49.8 mm (2.0 in)
1975	52.8 mm (2.1 in)
1976	54.9 mm (2.2 in)
1977	40.9 mm (1.6 in)
1978	48.3 mm (1.9 in)
1979	50.3 mm (2.0 in)
1980	26.2 mm (1.0 in)
1981	54.4 mm (2.1 in)
1982	37.6 mm (1.5 in)
1983	42.9 mm (1.7 in)
1984	76.5 mm (3.0 in)
1985	58.4 mm (2.3 in)
1986	25.9 mm (1.0 in)
1987	31.8 mm (1.3 in)
1988	60.2 mm (2.4 in)
1993	74.9 mm (2.9 in)
1995	19.8 mm (0.8 in)
1996	47.8 mm (1.9 in)
1997	50.3 mm (2.0 in)
1998	60.5 mm (2.4 in)
1999	46.5 mm (1.8 in)
2001	50.3 mm (2.0 in)
2002	41.4 mm (1.6 in)
2003	40.1 mm (1.6 in)
2004	45.5 mm (1.8 in)
2005	37.8 mm (1.5 in)
2006	63.5 mm (2.5 in)
2007	45.5 mm (1.8 in)
2008	62.5 mm (2.5 in)
2009	49.8 mm (2.0 in)
2010	30.5 mm (1.2 in)
2011	75.9 mm (3.0 in)
2012	47.0 mm (1.9 in)

Wettest five days (Rx5day)

The wettest five days of the year at Presa Las Ruinas, 1969 to 2012. The record is 171.4 mm (6.7 in) in 2011, marked on the chart; the median year is 100.4 mm (4.0 in).

Wettest five days (Rx5day) at Presa Las Ruinas by year
Year	Wettest five days (Rx5day)
1969	136.2 mm (5.4 in)
1970	127.9 mm (5.0 in)
1971	68.2 mm (2.7 in)
1972	106.2 mm (4.2 in)
1973	60.5 mm (2.4 in)
1974	94.4 mm (3.7 in)
1975	98.4 mm (3.9 in)
1976	120.5 mm (4.7 in)
1977	65.3 mm (2.6 in)
1978	75.8 mm (3.0 in)
1979	129.1 mm (5.1 in)
1980	55.2 mm (2.2 in)
1981	70.4 mm (2.8 in)
1982	78.6 mm (3.1 in)
1983	102.4 mm (4.0 in)
1984	118.4 mm (4.7 in)
1985	111.5 mm (4.4 in)
1986	86.6 mm (3.4 in)
1987	76.7 mm (3.0 in)
1988	115.1 mm (4.5 in)
1993	121.1 mm (4.8 in)
1995	26.9 mm (1.1 in)
1996	112.4 mm (4.4 in)
1997	76.5 mm (3.0 in)
1998	159.2 mm (6.3 in)
1999	108.7 mm (4.3 in)
2001	85.6 mm (3.4 in)
2002	88.4 mm (3.5 in)
2003	85.9 mm (3.4 in)
2004	64.9 mm (2.6 in)
2005	104.0 mm (4.1 in)
2006	145.4 mm (5.7 in)
2007	93.6 mm (3.7 in)
2008	117.3 mm (4.6 in)
2009	109.8 mm (4.3 in)
2010	102.4 mm (4.0 in)
2011	171.4 mm (6.7 in)
2012	84.1 mm (3.3 in)

Longest dry spell (CDD)

The longest dry spell of the year at Presa Las Ruinas, 1969 to 2012. The record is 128 days in 1998, marked on the chart; the median year is 55 days.

Longest dry spell (CDD) at Presa Las Ruinas by year
Year	Longest dry spell (CDD)
1969	62 days
1970	63 days
1971	76 days
1972	58 days
1973	57 days
1974	37 days
1975	94 days
1976	38 days
1977	49 days
1978	43 days
1979	41 days
1980	40 days
1981	31 days
1982	56 days
1983	55 days
1984	92 days
1985	55 days
1986	99 days
1987	49 days
1988	39 days
1993	46 days
1995	46 days
1996	67 days
1997	76 days
1998	128 days
1999	78 days
2001	78 days
2002	46 days
2003	47 days
2004	59 days
2005	102 days
2006	52 days
2007	28 days
2008	46 days
2009	24 days
2010	38 days
2011	91 days
2012	57 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

20 years with a frost

Across 20 years with a frost, the median last spring frost at Presa Las Ruinas falls on 24 February and the median first autumn frost on 10 November, which leaves a median of 262 days between them.

Frost dates and growing season at Presa Las Ruinas
Measure	Median, all years	Earliest period	Recent period (1979 to 2012)	Recent against earliest	Fitted trend
Last spring frost	24 February	n/a	24 February	n/a	n/a
First autumn frost	10 November	n/a	10 November	n/a	n/a
Growing days	262 days	n/a	262 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.

Rainfall Return Levels

33 years, 1970 to 2012

A day with at least 48.2 mm (1.9 in) of rain is expected about once in 2 years. A day with at least 83.3 mm (3.3 in) of rain is expected about once in 100 years.

Rainfall return levels at Presa Las Ruinas: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	48.2 mm (1.9 in)
5 years	60.4 mm (2.4 in)
10 years	67.2 mm (2.6 in)
25 years	74.5 mm (2.9 in)
50 years	79.2 mm (3.1 in)	Longer than the 33 years of record
100 years	83.3 mm (3.3 in)	Longer than the 33 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, 33 years of values from 1970 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: 76.5 mm (3.0 in) in 1984; 75.9 mm (3.0 in) in 2011; 74.9 mm (2.9 in) in 1993.

Download the Data

Data for Presa Las Ruinas standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Presa Las Ruinas 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).