Ayo El Chico Weather Records (MXN00014020)

Record envelope, standing records and threshold days for Ayo El Chico (MXN00014020), Mexico, with 43 years of record.

Key Facts for Ayo El Chico

Ayo El Chico (MXN00014020) is a weather station in Mexico at 20.53 latitude and -102.33 longitude, 1,610 m (5,282 ft) above sea level.
The station reports from 1948 to 1990, 43 years of record.
1,464 records set at Ayo El Chico still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Ayo El Chico set a daily record precipitation of 39.9 mm (1.6 in) on 10 August 1990.

About the Station

Location: Mexico, 20.53 latitude, -102.33 longitude.
Elevation: 1,610 m (5,282 ft).
Period of record: 1948 to 1990, 43 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 Ayo El Chico. 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 Ayo El Chico, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	32.8 C (91.0 F)	-2.2 C (28.0 F)	n/a	n/a
Feb	34.4 C (93.9 F)	0.6 C (33.1 F)	n/a	n/a
Mar	37.8 C (100.0 F)	0.6 C (33.1 F)	n/a	n/a
Apr	38.9 C (102.0 F)	3.9 C (39.0 F)	n/a	n/a
May	38.9 C (102.0 F)	0.6 C (33.1 F)	n/a	n/a
Jun	37.8 C (100.0 F)	4.4 C (39.9 F)	n/a	n/a
Jul	35.0 C (95.0 F)	4.4 C (39.9 F)	n/a	n/a
Aug	35.0 C (95.0 F)	5.6 C (42.1 F)	n/a	n/a
Sep	35.0 C (95.0 F)	5.6 C (42.1 F)	n/a	n/a
Oct	35.6 C (96.1 F)	-1.1 C (30.0 F)	n/a	n/a
Nov	35.0 C (95.0 F)	-5.0 C (23.0 F)	n/a	n/a
Dec	33.3 C (91.9 F)	1.1 C (34.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Ayo El Chico still stand. 1988 holds the most, with 209.

Standing records at Ayo El Chico by the year they were set
Year set	Standing records
1964	24
1965	68
1966	87
1967	65
1968	40
1969	56
1970	38
1971	26
1972	69
1973	28
1974	123
1975	52
1976	24
1977	53
1978	31
1979	50
1980	40
1981	40
1982	51
1983	59
1984	27
1985	20
1986	18
1987	49
1988	209
1989	48
1990	69

Wettest Day of Each Month

Jul: 94.5 mm (3.7 in)

The wettest day on record for each calendar month at Ayo El Chico. The most was 94.5 mm (3.7 in) on 4 July 1960.

Record daily precipitation for each month at Ayo El Chico
Month	Record daily precipitation (mm)	Date
Jan	32.3 mm (1.3 in)	23 January 1980
Feb	23.4 mm (0.9 in)	17 February 1968
Mar	43.4 mm (1.7 in)	4 March 1968
Apr	30.5 mm (1.2 in)	17 April 1959
May	82.6 mm (3.3 in)	18 May 1966
Jun	69.1 mm (2.7 in)	6 June 1959
Jul	94.5 mm (3.7 in)	4 July 1960
Aug	72.6 mm (2.9 in)	11 August 1975
Sep	70.4 mm (2.8 in)	2 September 1977
Oct	62.5 mm (2.5 in)	25 October 1959
Nov	38.4 mm (1.5 in)	26 November 1982
Dec	22.9 mm (0.9 in)	10 December 1953

Period of Record Coverage

1964 to 1990

27 years of record at Ayo El Chico, 1964 to 1990. 5 years have data for under 90 percent of days and are left out of rankings: 1964, 1986, 1987, 1989, 1990.

Days with data per year at Ayo El Chico
Year	Days with data	Share of year	Complete
1964	167	46%	No
1965	364	100%	Yes
1966	365	100%	Yes
1967	364	100%	Yes
1968	363	99%	Yes
1969	363	99%	Yes
1970	364	100%	Yes
1971	364	100%	Yes
1972	366	100%	Yes
1973	365	100%	Yes
1974	365	100%	Yes
1975	363	99%	Yes
1976	334	91%	Yes
1977	364	100%	Yes
1978	365	100%	Yes
1979	364	100%	Yes
1980	332	91%	Yes
1981	365	100%	Yes
1982	364	100%	Yes
1983	364	100%	Yes
1984	366	100%	Yes
1985	365	100%	Yes
1986	296	81%	No
1987	92	25%	No
1988	366	100%	Yes
1989	104	28%	No
1990	54	15%	No

Latest Records

Latest records at Ayo El Chico
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
10 August 1990	Ayo El Chico, MX	daily rain	39.9 mm (1.6 in)	7.9 mm (0.31 in)	12 years	14 of 100 (Routine)
16 July 1990	Ayo El Chico, MX	daily rain	34.3 mm (1.4 in)	2.0 mm (0.08 in)	35 years	15 of 100 (Routine)
2 July 1990	Ayo El Chico, MX	daily rain	93.0 mm (3.7 in)	46.3 mm (1.8 in)	0 years	40 of 100 (Notable)
14 June 1990	Ayo El Chico, MX	daily rain	28.7 mm (1.1 in)	0.5 mm (0.02 in)	7 years	6 of 100 (Routine)
7 June 1990	Ayo El Chico, MX	daily rain	19.8 mm (0.8 in)	7.6 mm (0.30 in)	17 years	15 of 100 (Routine)
7 May 1990	Ayo El Chico, MX	daily rain	8.4 mm (0.33 in)	5.6 mm (0.22 in)	41 years	20 of 100 (Routine)
5 May 1990	Ayo El Chico, MX	daily rain	17.5 mm (0.7 in)	9.6 mm (0.38 in)	41 years	20 of 100 (Routine)
21 April 1990	Ayo El Chico, MX	daily rain	1.3 mm (0.05 in)	1.3 mm (0.05 in)	41 years	17 of 100 (Routine)
14 January 1990	Ayo El Chico, MX	daily rain	0.5 mm (0.02 in)	0.5 mm (0.02 in)	39 years	15 of 100 (Routine)
6 December 1989	Ayo El Chico, MX	daily rain	16.8 mm (0.7 in)	15.5 mm (0.6 in)	36 years	20 of 100 (Routine)
5 December 1989	Ayo El Chico, MX	daily rain (Tie)	3.6 mm (0.14 in)	tie	20 years	2 of 100 (Routine)
2 July 1989	Ayo El Chico, MX	daily rain	46.7 mm (1.8 in)	10.4 mm (0.4 in)	20 years	18 of 100 (Routine)
30 November 1988	Ayo El Chico, MX	daily rain	7.4 mm (0.29 in)	2.6 mm (0.10 in)	1 year	6 of 100 (Routine)
7 March 1988	Ayo El Chico, MX	daily rain	19.8 mm (0.8 in)	13.7 mm (0.5 in)	30 years	20 of 100 (Routine)
3 March 1988	Ayo El Chico, MX	daily rain	19.8 mm (0.8 in)	1.3 mm (0.05 in)	20 years	11 of 100 (Routine)
2 January 1988	Ayo El Chico, MX	daily rain	8.4 mm (0.33 in)	3.1 mm (0.12 in)	4 years	8 of 100 (Routine)
30 December 1987	Ayo El Chico, MX	daily rain	15.0 mm (0.6 in)	15.0 mm (0.6 in)	36 years	20 of 100 (Routine)
30 November 1987	Ayo El Chico, MX	daily rain	4.8 mm (0.19 in)	4.8 mm (0.19 in)	36 years	20 of 100 (Routine)
28 November 1987	Ayo El Chico, MX	daily rain	11.9 mm (0.5 in)	10.1 mm (0.4 in)	8 years	17 of 100 (Routine)
10 November 1987	Ayo El Chico, MX	daily rain	7.9 mm (0.31 in)	7.6 mm (0.30 in)	9 years	14 of 100 (Routine)

Climate Trend

20 complete years, 1965 to 1988

One stripe for each of 20 complete years at Ayo El Chico, 1965 to 1988. Blue stripes are years cooler than the station's own mean of 20.2 C (68.4 F); red stripes are warmer. The coolest year was 1988, at 17.9 C (64.3 F), and the warmest was 1982, at 20.9 C (69.6 F). The strongest colour marks a difference of 2.3 C (4.1 F).

Annual mean temperature at Ayo El Chico as warming stripes, 1965 to 1988
Year	Annual mean temperature	Difference from the station mean
1965	20.7 C	+0.51 C
1966	20.2 C	-0.08 C
1967	20.0 C	-0.25 C
1968	20.0 C	-0.27 C
1969	20.6 C	+0.40 C
1970	20.4 C	+0.20 C
1971	19.9 C	-0.30 C
1972	20.9 C	+0.66 C
1973	20.6 C	+0.34 C
1974	19.1 C	-1.10 C
1975	20.3 C	+0.04 C
1977	20.6 C	+0.40 C
1978	20.5 C	+0.29 C
1979	20.8 C	+0.52 C
1981	20.7 C	+0.46 C
1982	20.9 C	+0.68 C
1983	20.1 C	-0.12 C
1984	20.1 C	-0.10 C
1985	20.3 C	+0.04 C
1988	17.9 C	-2.29 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

1948 to 1990

Yearly extremes at Ayo El Chico: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	38.9 C (102.0 F)	1965	36.7 C (98.1 F)	27
Coldest night (TNn)	-5.0 C (23.0 F)	1989	1.7 C (35.1 F)	27
Wettest day (Rx1day)	94.5 mm (3.7 in)	1960	53.8 mm (2.1 in)	42
Wettest five days (Rx5day)	207.5 mm (8.2 in)	1976	105.3 mm (4.1 in)	42
Longest dry spell (CDD)	143 days	1953	70 days	42

Hottest day (TXx)

The hottest day of the year at Ayo El Chico, 1948 to 1990. The record is 38.9 C (102.0 F) in 1965, marked on the chart; the median year is 36.7 C (98.1 F).

Hottest day (TXx) at Ayo El Chico by year
Year	Hottest day (TXx)
1948	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	32.2 C (90.0 F)
1965	38.9 C (102.0 F)
1966	36.7 C (98.1 F)
1967	38.9 C (102.0 F)
1968	36.1 C (97.0 F)
1969	37.2 C (99.0 F)
1970	36.1 C (97.0 F)
1971	36.7 C (98.1 F)
1972	38.3 C (100.9 F)
1973	36.7 C (98.1 F)
1974	36.1 C (97.0 F)
1975	35.0 C (95.0 F)
1976	36.7 C (98.1 F)
1977	36.7 C (98.1 F)
1978	37.2 C (99.0 F)
1979	35.6 C (96.1 F)
1980	37.8 C (100.0 F)
1981	36.1 C (97.0 F)
1982	38.9 C (102.0 F)
1983	38.9 C (102.0 F)
1984	35.0 C (95.0 F)
1985	35.6 C (96.1 F)
1986	35.6 C (96.1 F)
1987	35.0 C (95.0 F)
1988	36.7 C (98.1 F)
1989	31.7 C (89.1 F)
1990	21.1 C (70.0 F)

Coldest night (TNn)

The coldest night of the year at Ayo El Chico, 1948 to 1990. The record is -5.0 C (23.0 F) in 1989, marked on the chart; the median year is 1.7 C (35.1 F).

Coldest night (TNn) at Ayo El Chico by year
Year	Coldest night (TNn)
1948	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	2.2 C (36.0 F)
1965	1.1 C (34.0 F)
1966	1.7 C (35.1 F)
1967	0.6 C (33.1 F)
1968	2.8 C (37.0 F)
1969	2.8 C (37.0 F)
1970	1.7 C (35.1 F)
1971	2.2 C (36.0 F)
1972	2.8 C (37.0 F)
1973	1.7 C (35.1 F)
1974	0.6 C (33.1 F)
1975	1.1 C (34.0 F)
1976	0.6 C (33.1 F)
1977	3.3 C (37.9 F)
1978	2.8 C (37.0 F)
1979	1.1 C (34.0 F)
1980	2.2 C (36.0 F)
1981	1.1 C (34.0 F)
1982	3.3 C (37.9 F)
1983	0.6 C (33.1 F)
1984	4.4 C (39.9 F)
1985	1.7 C (35.1 F)
1986	2.2 C (36.0 F)
1987	1.1 C (34.0 F)
1988	-2.2 C (28.0 F)
1989	-5.0 C (23.0 F)
1990	4.4 C (39.9 F)

Wettest day (Rx1day)

The wettest day of the year at Ayo El Chico, 1948 to 1990. The record is 94.5 mm (3.7 in) in 1960, marked on the chart; the median year is 53.8 mm (2.1 in).

Wettest day (Rx1day) at Ayo El Chico by year
Year	Wettest day (Rx1day)
1948	36.3 mm (1.4 in)
1950	40.6 mm (1.6 in)
1951	42.2 mm (1.7 in)
1952	43.2 mm (1.7 in)
1953	43.2 mm (1.7 in)
1954	64.3 mm (2.5 in)
1955	57.2 mm (2.3 in)
1956	36.6 mm (1.4 in)
1957	42.7 mm (1.7 in)
1958	47.5 mm (1.9 in)
1959	69.1 mm (2.7 in)
1960	94.5 mm (3.7 in)
1961	49.5 mm (1.9 in)
1962	51.6 mm (2.0 in)
1963	47.8 mm (1.9 in)
1964	41.4 mm (1.6 in)
1965	57.7 mm (2.3 in)
1966	82.6 mm (3.3 in)
1967	56.6 mm (2.2 in)
1968	52.6 mm (2.1 in)
1969	56.6 mm (2.2 in)
1970	46.2 mm (1.8 in)
1971	61.2 mm (2.4 in)
1972	54.4 mm (2.1 in)
1973	58.7 mm (2.3 in)
1974	68.8 mm (2.7 in)
1975	72.6 mm (2.9 in)
1976	89.7 mm (3.5 in)
1977	70.4 mm (2.8 in)
1978	53.1 mm (2.1 in)
1979	62.2 mm (2.4 in)
1980	44.5 mm (1.8 in)
1981	37.8 mm (1.5 in)
1982	46.5 mm (1.8 in)
1983	57.2 mm (2.3 in)
1984	81.3 mm (3.2 in)
1985	58.7 mm (2.3 in)
1986	55.6 mm (2.2 in)
1987	15.0 mm (0.6 in)
1988	51.8 mm (2.0 in)
1989	46.7 mm (1.8 in)
1990	93.0 mm (3.7 in)

Wettest five days (Rx5day)

The wettest five days of the year at Ayo El Chico, 1948 to 1990. The record is 207.5 mm (8.2 in) in 1976, marked on the chart; the median year is 105.3 mm (4.1 in).

Wettest five days (Rx5day) at Ayo El Chico by year
Year	Wettest five days (Rx5day)
1948	102.4 mm (4.0 in)
1950	113.0 mm (4.4 in)
1951	75.0 mm (3.0 in)
1952	108.0 mm (4.3 in)
1953	89.8 mm (3.5 in)
1954	112.6 mm (4.4 in)
1955	110.8 mm (4.4 in)
1956	85.1 mm (3.4 in)
1957	73.4 mm (2.9 in)
1958	81.0 mm (3.2 in)
1959	167.9 mm (6.6 in)
1960	127.3 mm (5.0 in)
1961	96.3 mm (3.8 in)
1962	99.7 mm (3.9 in)
1963	169.0 mm (6.7 in)
1964	73.6 mm (2.9 in)
1965	108.2 mm (4.3 in)
1966	98.3 mm (3.9 in)
1967	127.2 mm (5.0 in)
1968	91.1 mm (3.6 in)
1969	91.4 mm (3.6 in)
1970	104.4 mm (4.1 in)
1971	106.2 mm (4.2 in)
1972	98.3 mm (3.9 in)
1973	180.2 mm (7.1 in)
1974	81.2 mm (3.2 in)
1975	144.0 mm (5.7 in)
1976	207.5 mm (8.2 in)
1977	128.8 mm (5.1 in)
1978	79.0 mm (3.1 in)
1979	102.6 mm (4.0 in)
1980	122.5 mm (4.8 in)
1981	119.6 mm (4.7 in)
1982	74.7 mm (2.9 in)
1983	127.9 mm (5.0 in)
1984	136.9 mm (5.4 in)
1985	116.7 mm (4.6 in)
1986	111.5 mm (4.4 in)
1987	16.7 mm (0.7 in)
1988	70.9 mm (2.8 in)
1989	72.9 mm (2.9 in)
1990	134.4 mm (5.3 in)

Longest dry spell (CDD)

The longest dry spell of the year at Ayo El Chico, 1948 to 1990. The record is 143 days in 1953, marked on the chart; the median year is 70 days.

Longest dry spell (CDD) at Ayo El Chico by year
Year	Longest dry spell (CDD)
1948	15 days
1950	84 days
1951	70 days
1952	52 days
1953	143 days
1954	77 days
1955	119 days
1956	112 days
1957	61 days
1958	67 days
1959	60 days
1960	103 days
1961	67 days
1962	101 days
1963	58 days
1964	108 days
1965	55 days
1966	73 days
1967	70 days
1968	56 days
1969	56 days
1970	97 days
1971	67 days
1972	113 days
1973	73 days
1974	53 days
1975	63 days
1976	72 days
1977	47 days
1978	77 days
1979	100 days
1980	65 days
1981	35 days
1982	53 days
1983	71 days
1984	89 days
1985	92 days
1986	89 days
1987	40 days
1988	98 days
1989	44 days
1990	61 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

34 years, 1951 to 1988

A day with at least 55.1 mm (2.2 in) of rain is expected about once in 2 years. A day with at least 105.7 mm (4.2 in) of rain is expected about once in 100 years.

Rainfall return levels at Ayo El Chico: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	55.1 mm (2.2 in)
5 years	68.1 mm (2.7 in)
10 years	77.0 mm (3.0 in)
25 years	88.4 mm (3.5 in)
50 years	97.0 mm (3.8 in)	Longer than the 34 years of record
100 years	105.7 mm (4.2 in)	Longer than the 34 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, 34 years of values from 1951 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: 94.5 mm (3.7 in) in 1960; 89.7 mm (3.5 in) in 1976; 82.6 mm (3.3 in) in 1966.

Download the Data

Data for Ayo El Chico standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Ayo El Chico 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).