Presa Ansaldo Weather Records (MXN00009037)

Record envelope, standing records and threshold days for Presa Ansaldo (MXN00009037), Mexico, with 36 years of record.

Key Facts for Presa Ansaldo

Presa Ansaldo (MXN00009037) is a weather station in Mexico at 19.33 latitude and -99.22 longitude, 2,363 m (7,752 ft) above sea level.
The station reports from 1953 to 1988, 36 years of record.
1,464 records set at Presa Ansaldo still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Presa Ansaldo tied a daily record high minimum temperature of 10.0 C (50.0 F) on 13 December 1988.

About the Station

Location: Mexico, 19.33 latitude, -99.22 longitude.
Elevation: 2,363 m (7,752 ft).
Period of record: 1953 to 1988, 36 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 Presa Ansaldo. 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 Ansaldo, 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)	-5.6 C (21.9 F)	n/a	n/a
Feb	30.0 C (86.0 F)	-4.4 C (24.1 F)	n/a	n/a
Mar	31.7 C (89.1 F)	-2.2 C (28.0 F)	n/a	n/a
Apr	33.3 C (91.9 F)	0.0 C (32.0 F)	n/a	n/a
May	32.8 C (91.0 F)	3.9 C (39.0 F)	n/a	n/a
Jun	31.1 C (88.0 F)	4.4 C (39.9 F)	n/a	n/a
Jul	28.3 C (82.9 F)	3.9 C (39.0 F)	n/a	n/a
Aug	28.9 C (84.0 F)	3.9 C (39.0 F)	n/a	n/a
Sep	29.4 C (84.9 F)	2.8 C (37.0 F)	n/a	n/a
Oct	27.2 C (81.0 F)	0.0 C (32.0 F)	n/a	n/a
Nov	28.9 C (84.0 F)	-3.3 C (26.1 F)	n/a	n/a
Dec	26.7 C (80.1 F)	-4.4 C (24.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Presa Ansaldo still stand. 1955 holds the most, with 89.

Standing records at Presa Ansaldo by the year they were set
Year set	Standing records
1953	18
1954	87
1955	89
1956	45
1957	49
1958	54
1959	45
1960	57
1961	61
1962	65
1963	31
1964	33
1965	33
1966	60
1967	31
1968	25
1969	42
1970	30
1971	29
1972	21
1973	30
1974	52
1975	32
1976	40
1977	37
1978	39
1979	32
1980	24
1981	22
1982	13
1983	17
1984	71
1985	37
1986	25
1987	54
1988	34

Wettest Day of Each Month

Aug: 77.0 mm (3.0 in)

The wettest day on record for each calendar month at Presa Ansaldo. The most was 77.0 mm (3.0 in) on 9 August 1978.

Record daily precipitation for each month at Presa Ansaldo
Month	Record daily precipitation (mm)	Date
Jan	34.5 mm (1.4 in)	10 January 1967
Feb	19.1 mm (0.8 in)	21 February 1965
Mar	35.1 mm (1.4 in)	16 March 1978
Apr	42.7 mm (1.7 in)	13 April 1962
May	52.8 mm (2.1 in)	28 May 1986
Jun	55.6 mm (2.2 in)	19 June 1985
Jul	53.6 mm (2.1 in)	7 July 1966
Aug	77.0 mm (3.0 in)	9 August 1978
Sep	71.6 mm (2.8 in)	4 September 1973
Oct	57.9 mm (2.3 in)	3 October 1986
Nov	26.9 mm (1.1 in)	21 November 1974
Dec	16.8 mm (0.7 in)	2 December 1976

Period of Record Coverage

1953 to 1988

36 years of record at Presa Ansaldo, 1953 to 1988. 2 years have data for under 90 percent of days and are left out of rankings: 1953, 1985.

Days with data per year at Presa Ansaldo
Year	Days with data	Share of year	Complete
1953	61	17%	No
1954	365	100%	Yes
1955	365	100%	Yes
1956	366	100%	Yes
1957	364	100%	Yes
1958	364	100%	Yes
1959	364	100%	Yes
1960	366	100%	Yes
1961	363	99%	Yes
1962	365	100%	Yes
1963	365	100%	Yes
1964	366	100%	Yes
1965	365	100%	Yes
1966	365	100%	Yes
1967	365	100%	Yes
1968	366	100%	Yes
1969	365	100%	Yes
1970	365	100%	Yes
1971	365	100%	Yes
1972	366	100%	Yes
1973	365	100%	Yes
1974	365	100%	Yes
1975	337	92%	Yes
1976	366	100%	Yes
1977	365	100%	Yes
1978	364	100%	Yes
1979	365	100%	Yes
1980	366	100%	Yes
1981	365	100%	Yes
1982	350	96%	Yes
1983	334	92%	Yes
1984	366	100%	Yes
1985	306	84%	No
1986	365	100%	Yes
1987	365	100%	Yes
1988	366	100%	Yes

Latest Records

Latest records at Presa Ansaldo
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
13 December 1988	Presa Ansaldo, MX	daily high min (Tie)	10.0 C (50.0 F)	tie	5 years	1 of 100 (Routine)
12 December 1988	Presa Ansaldo, MX	daily high min	10.0 C (50.0 F)	1.1 C (2.0 F)	5 years	8 of 100 (Routine)
28 November 1988	Presa Ansaldo, MX	daily high max (Tie)	25.0 C (77.0 F)	tie	35 years	3 of 100 (Routine)
14 November 1988	Presa Ansaldo, MX	daily high max	25.6 C (78.1 F)	0.6 C (1.1 F)	30 years	14 of 100 (Routine)
13 November 1988	Presa Ansaldo, MX	daily high max (Tie)	25.6 C (78.1 F)	tie	19 years	2 of 100 (Routine)
11 November 1988	Presa Ansaldo, MX	daily high max (Tie)	25.0 C (77.0 F)	tie	27 years	2 of 100 (Routine)
5 November 1988	Presa Ansaldo, MX	daily high max	27.8 C (82.0 F)	2.8 C (5.0 F)	21 years	19 of 100 (Routine)
2 November 1988	Presa Ansaldo, MX	daily low min (Tie)	2.8 C (37.0 F)	tie	21 years	2 of 100 (Routine)
1 November 1988	Presa Ansaldo, MX	daily low max (Tie)	18.9 C (66.0 F)	tie	23 years	2 of 100 (Routine)
31 October 1988	Presa Ansaldo, MX	monthly high min	13.9 C (57.0 F)	0.6 C (1.1 F)	10 years	18 of 100 (Routine)
30 October 1988	Presa Ansaldo, MX	daily high min	11.7 C (53.1 F)	1.1 C (2.0 F)	34 years	17 of 100 (Routine)
29 October 1988	Presa Ansaldo, MX	daily high max (Tie)	25.0 C (77.0 F)	tie	29 years	2 of 100 (Routine)
23 October 1988	Presa Ansaldo, MX	daily high min	12.8 C (55.0 F)	2.2 C (4.0 F)	31 years	21 of 100 (Routine)
17 October 1988	Presa Ansaldo, MX	daily high min	12.8 C (55.0 F)	0.6 C (1.1 F)	8 years	7 of 100 (Routine)
10 October 1988	Presa Ansaldo, MX	daily rain	19.8 mm (0.8 in)	5.3 mm (0.21 in)	5 years	9 of 100 (Routine)
20 September 1988	Presa Ansaldo, MX	daily high max (Tie)	25.0 C (77.0 F)	tie	7 years	1 of 100 (Routine)
19 September 1988	Presa Ansaldo, MX	daily high max (Tie)	25.0 C (77.0 F)	tie	34 years	3 of 100 (Routine)
11 September 1988	Presa Ansaldo, MX	daily low min	7.8 C (46.0 F)	0.5 C (0.9 F)	3 years	6 of 100 (Routine)
2 September 1988	Presa Ansaldo, MX	daily high min	13.9 C (57.0 F)	1.1 C (2.0 F)	26 years	16 of 100 (Routine)
31 August 1988	Presa Ansaldo, MX	daily rain	34.8 mm (1.4 in)	9.1 mm (0.36 in)	22 years	17 of 100 (Routine)

Climate Trend

31 complete years, 1954 to 1988

One stripe for each of 31 complete years at Presa Ansaldo, 1954 to 1988. Blue stripes are years cooler than the station's own mean of 15.3 C (59.6 F); red stripes are warmer. The coolest year was 1974, at 14.2 C (57.5 F), and the warmest was 1984, at 16.3 C (61.3 F). The strongest colour marks a difference of 1.2 C (2.2 F).

Annual mean temperature at Presa Ansaldo as warming stripes, 1954 to 1988
Year	Annual mean temperature	Difference from the station mean
1954	15.7 C	+0.36 C
1955	15.4 C	+0.07 C
1956	14.8 C	-0.51 C
1957	15.6 C	+0.23 C
1958	15.8 C	+0.41 C
1959	15.7 C	+0.31 C
1960	15.9 C	+0.58 C
1961	15.8 C	+0.41 C
1962	15.8 C	+0.42 C
1963	15.1 C	-0.28 C
1964	15.3 C	0.00 C
1965	14.9 C	-0.49 C
1966	14.7 C	-0.66 C
1967	14.8 C	-0.54 C
1968	14.9 C	-0.45 C
1969	15.7 C	+0.39 C
1970	15.4 C	+0.09 C
1971	15.4 C	+0.08 C
1972	15.1 C	-0.28 C
1973	15.0 C	-0.39 C
1974	14.2 C	-1.16 C
1976	14.2 C	-1.10 C
1977	14.9 C	-0.40 C
1978	15.3 C	-0.04 C
1979	15.5 C	+0.15 C
1980	15.5 C	+0.18 C
1981	15.5 C	+0.13 C
1984	16.3 C	+0.95 C
1986	15.8 C	+0.47 C
1987	16.0 C	+0.69 C
1988	15.9 C	+0.51 C

The fitted trend in annual mean temperature here over 1954 to 1988 is 0.1 C (-0.1 to 0.2) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.1 F (-0.2 to 0.4) per decade. The slope is a straight line fitted to 31 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Presa Ansaldo
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.1 C (-0.1 to 0.2) per decade	0.1 F (-0.2 to 0.4) per decade	1954 to 1988	31	Not clearly different from zero
Mean daily maximum	-0.1 C (-0.4 to 0.1) per decade	-0.3 F (-0.8 to 0.3) per decade	1954 to 1988	31	Not clearly different from zero
Mean daily minimum	0.25 C (0.04 to 0.46) per decade	0.4 F (0.1 to 0.8) per decade	1954 to 1988	31	Rise

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

1953 to 1988

Yearly extremes at Presa Ansaldo: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	33.3 C (91.9 F)	1978	30.0 C (86.0 F)	36
Coldest night (TNn)	-5.6 C (21.9 F)	1956	-1.1 C (30.0 F)	36
Wettest day (Rx1day)	77.0 mm (3.0 in)	1978	44.8 mm (1.8 in)	36
Wettest five days (Rx5day)	162.4 mm (6.4 in)	1984	95.9 mm (3.8 in)	36
Longest dry spell (CDD)	112 days	1984	57 days	36

Hottest day (TXx)

The hottest day of the year at Presa Ansaldo, 1953 to 1988. The record is 33.3 C (91.9 F) in 1978, marked on the chart; the median year is 30.0 C (86.0 F).

Hottest day (TXx) at Presa Ansaldo by year
Year	Hottest day (TXx)
1953	27.2 C (81.0 F)
1954	31.7 C (89.1 F)
1955	30.6 C (87.1 F)
1956	30.6 C (87.1 F)
1957	30.6 C (87.1 F)
1958	30.6 C (87.1 F)
1959	28.9 C (84.0 F)
1960	30.6 C (87.1 F)
1961	32.8 C (91.0 F)
1962	31.1 C (88.0 F)
1963	30.0 C (86.0 F)
1964	30.0 C (86.0 F)
1965	30.0 C (86.0 F)
1966	30.6 C (87.1 F)
1967	31.1 C (88.0 F)
1968	27.8 C (82.0 F)
1969	31.1 C (88.0 F)
1970	31.1 C (88.0 F)
1971	31.7 C (89.1 F)
1972	28.9 C (84.0 F)
1973	30.0 C (86.0 F)
1974	27.8 C (82.0 F)
1975	28.9 C (84.0 F)
1976	27.2 C (81.0 F)
1977	30.0 C (86.0 F)
1978	33.3 C (91.9 F)
1979	30.0 C (86.0 F)
1980	30.6 C (87.1 F)
1981	30.0 C (86.0 F)
1982	31.1 C (88.0 F)
1983	29.4 C (84.9 F)
1984	25.0 C (77.0 F)
1985	25.6 C (78.1 F)
1986	30.0 C (86.0 F)
1987	29.4 C (84.9 F)
1988	31.7 C (89.1 F)

Coldest night (TNn)

The coldest night of the year at Presa Ansaldo, 1953 to 1988. The record is -5.6 C (21.9 F) in 1956, marked on the chart; the median year is -1.1 C (30.0 F).

Coldest night (TNn) at Presa Ansaldo by year
Year	Coldest night (TNn)
1953	-3.3 C (26.1 F)
1954	-4.4 C (24.1 F)
1955	-3.3 C (26.1 F)
1956	-5.6 C (21.9 F)
1957	-3.3 C (26.1 F)
1958	0.0 C (32.0 F)
1959	0.6 C (33.1 F)
1960	-4.4 C (24.1 F)
1961	-2.2 C (28.0 F)
1962	0.0 C (32.0 F)
1963	0.0 C (32.0 F)
1964	0.0 C (32.0 F)
1965	0.0 C (32.0 F)
1966	-3.3 C (26.1 F)
1967	-2.2 C (28.0 F)
1968	-3.3 C (26.1 F)
1969	-1.1 C (30.0 F)
1970	-1.7 C (28.9 F)
1971	-1.1 C (30.0 F)
1972	-1.1 C (30.0 F)
1973	-2.2 C (28.0 F)
1974	-2.2 C (28.0 F)
1975	-3.3 C (26.1 F)
1976	-3.3 C (26.1 F)
1977	0.0 C (32.0 F)
1978	0.6 C (33.1 F)
1979	0.0 C (32.0 F)
1980	0.0 C (32.0 F)
1981	0.0 C (32.0 F)
1982	1.7 C (35.1 F)
1983	0.0 C (32.0 F)
1984	2.8 C (37.0 F)
1985	3.3 C (37.9 F)
1986	-2.8 C (27.0 F)
1987	0.0 C (32.0 F)
1988	0.0 C (32.0 F)

Wettest day (Rx1day)

The wettest day of the year at Presa Ansaldo, 1953 to 1988. The record is 77.0 mm (3.0 in) in 1978, marked on the chart; the median year is 44.8 mm (1.8 in).

Wettest day (Rx1day) at Presa Ansaldo by year
Year	Wettest day (Rx1day)
1953	23.9 mm (0.9 in)
1954	42.9 mm (1.7 in)
1955	31.0 mm (1.2 in)
1956	30.5 mm (1.2 in)
1957	32.3 mm (1.3 in)
1958	56.9 mm (2.2 in)
1959	39.4 mm (1.6 in)
1960	52.3 mm (2.1 in)
1961	34.0 mm (1.3 in)
1962	48.0 mm (1.9 in)
1963	43.7 mm (1.7 in)
1964	39.1 mm (1.5 in)
1965	39.4 mm (1.6 in)
1966	53.6 mm (2.1 in)
1967	50.3 mm (2.0 in)
1968	65.5 mm (2.6 in)
1969	54.9 mm (2.2 in)
1970	36.8 mm (1.4 in)
1971	43.7 mm (1.7 in)
1972	45.0 mm (1.8 in)
1973	71.6 mm (2.8 in)
1974	55.4 mm (2.2 in)
1975	47.8 mm (1.9 in)
1976	42.2 mm (1.7 in)
1977	44.5 mm (1.8 in)
1978	77.0 mm (3.0 in)
1979	32.3 mm (1.3 in)
1980	47.8 mm (1.9 in)
1981	44.5 mm (1.8 in)
1982	39.9 mm (1.6 in)
1983	33.8 mm (1.3 in)
1984	63.8 mm (2.5 in)
1985	55.6 mm (2.2 in)
1986	57.9 mm (2.3 in)
1987	45.0 mm (1.8 in)
1988	68.8 mm (2.7 in)

Wettest five days (Rx5day)

The wettest five days of the year at Presa Ansaldo, 1953 to 1988. The record is 162.4 mm (6.4 in) in 1984, marked on the chart; the median year is 95.9 mm (3.8 in).

Wettest five days (Rx5day) at Presa Ansaldo by year
Year	Wettest five days (Rx5day)
1953	34.1 mm (1.3 in)
1954	89.9 mm (3.5 in)
1955	102.3 mm (4.0 in)
1956	86.6 mm (3.4 in)
1957	59.5 mm (2.3 in)
1958	107.5 mm (4.2 in)
1959	86.7 mm (3.4 in)
1960	96.8 mm (3.8 in)
1961	82.1 mm (3.2 in)
1962	94.9 mm (3.7 in)
1963	85.4 mm (3.4 in)
1964	93.0 mm (3.7 in)
1965	101.4 mm (4.0 in)
1966	108.5 mm (4.3 in)
1967	93.5 mm (3.7 in)
1968	104.6 mm (4.1 in)
1969	135.7 mm (5.3 in)
1970	70.7 mm (2.8 in)
1971	97.6 mm (3.8 in)
1972	67.3 mm (2.6 in)
1973	123.5 mm (4.9 in)
1974	137.1 mm (5.4 in)
1975	110.8 mm (4.4 in)
1976	101.7 mm (4.0 in)
1977	97.8 mm (3.9 in)
1978	98.9 mm (3.9 in)
1979	85.4 mm (3.4 in)
1980	85.0 mm (3.3 in)
1981	102.1 mm (4.0 in)
1982	58.9 mm (2.3 in)
1983	105.7 mm (4.2 in)
1984	162.4 mm (6.4 in)
1985	102.4 mm (4.0 in)
1986	94.1 mm (3.7 in)
1987	92.6 mm (3.6 in)
1988	87.4 mm (3.4 in)

Longest dry spell (CDD)

The longest dry spell of the year at Presa Ansaldo, 1953 to 1988. The record is 112 days in 1984, marked on the chart; the median year is 57 days.

Longest dry spell (CDD) at Presa Ansaldo by year
Year	Longest dry spell (CDD)
1953	52 days
1954	42 days
1955	54 days
1956	110 days
1957	65 days
1958	85 days
1959	67 days
1960	101 days
1961	43 days
1962	46 days
1963	73 days
1964	64 days
1965	43 days
1966	58 days
1967	68 days
1968	45 days
1969	84 days
1970	56 days
1971	77 days
1972	68 days
1973	57 days
1974	40 days
1975	65 days
1976	38 days
1977	63 days
1978	31 days
1979	41 days
1980	55 days
1981	48 days
1982	55 days
1983	52 days
1984	112 days
1985	69 days
1986	51 days
1987	92 days
1988	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.

Rainfall Return Levels

35 years, 1954 to 1988

A day with at least 45.8 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 84.8 mm (3.3 in) of rain is expected about once in 100 years.

Rainfall return levels at Presa Ansaldo: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	45.8 mm (1.8 in)
5 years	56.9 mm (2.2 in)
10 years	63.9 mm (2.5 in)
25 years	72.5 mm (2.9 in)
50 years	78.8 mm (3.1 in)	Longer than the 35 years of record
100 years	84.8 mm (3.3 in)	Longer than the 35 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, 35 years of values from 1954 to 1988.

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: 77.0 mm (3.0 in) in 1978; 71.6 mm (2.8 in) in 1973; 68.8 mm (2.7 in) in 1988.

Download the Data

Data for Presa Ansaldo standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Presa Ansaldo 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 2026-10-14 (14 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).