Acayucan Weather Records (MXN00030001)

Record envelope, standing records and threshold days for Acayucan (MXN00030001), Mexico, with 34 years of record.

Key Facts for Acayucan

Acayucan (MXN00030001) is a weather station in Mexico at 17.93 latitude and -94.90 longitude, 93 m (305 ft) above sea level.
The station reports from 1948 to 1981, 34 years of record.
1,464 records set at Acayucan still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.
Acayucan set a daily record precipitation of 7.9 mm (0.31 in) on 26 April 1981.

About the Station

Location: Mexico, 17.93 latitude, -94.90 longitude.
Elevation: 93 m (305 ft).
Period of record: 1948 to 1981, 34 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 Acayucan. 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 Acayucan, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	33.9 C (93.0 F)	9.4 C (48.9 F)	n/a	n/a
Feb	35.6 C (96.1 F)	10.0 C (50.0 F)	n/a	n/a
Mar	40.6 C (105.1 F)	11.1 C (52.0 F)	n/a	n/a
Apr	40.6 C (105.1 F)	11.7 C (53.1 F)	n/a	n/a
May	42.8 C (109.0 F)	13.9 C (57.0 F)	n/a	n/a
Jun	39.4 C (102.9 F)	18.9 C (66.0 F)	n/a	n/a
Jul	37.8 C (100.0 F)	12.8 C (55.0 F)	n/a	n/a
Aug	40.0 C (104.0 F)	11.7 C (53.1 F)	n/a	n/a
Sep	40.0 C (104.0 F)	13.9 C (57.0 F)	n/a	n/a
Oct	40.0 C (104.0 F)	10.0 C (50.0 F)	n/a	n/a
Nov	37.2 C (99.0 F)	10.0 C (50.0 F)	n/a	n/a
Dec	36.7 C (98.1 F)	7.8 C (46.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Acayucan still stand. 1954 holds the most, with 250.

Standing records at Acayucan by the year they were set
Year set	Standing records
1948	16
1949	76
1950	44
1951	58
1952	65
1953	29
1954	250
1955	99
1956	44
1957	30
1961	50
1962	38
1963	37
1964	62
1965	34
1966	64
1967	28
1968	28
1969	36
1970	39
1971	37
1972	24
1973	54
1974	34
1975	27
1976	24
1977	31
1978	22
1979	27
1980	51
1981	6

All-Time Record Progression

1 new records

1 all-time records were set at Acayucan between 24 September 1980 and 24 September 1980. Each dot is a new record.

Wettest Day of Each Month

Sep: 174.0 mm (6.9 in)

The wettest day on record for each calendar month at Acayucan. The most was 174.0 mm (6.9 in) on 24 September 1980.

Record daily precipitation for each month at Acayucan
Month	Record daily precipitation (mm)	Date
Jan	55.6 mm (2.2 in)	16 January 1972
Feb	50.8 mm (2.0 in)	13 February 1981
Mar	59.9 mm (2.4 in)	15 March 1957
Apr	62.0 mm (2.4 in)	16 April 1954
May	69.6 mm (2.7 in)	29 May 1956
Jun	167.9 mm (6.6 in)	19 June 1968
Jul	160.8 mm (6.3 in)	23 July 1977
Aug	107.2 mm (4.2 in)	7 August 1976
Sep	174.0 mm (6.9 in)	24 September 1980
Oct	134.9 mm (5.3 in)	27 October 1957
Nov	109.7 mm (4.3 in)	1 November 1961
Dec	66.8 mm (2.6 in)	12 December 1978

Period of Record Coverage

1948 to 1981

31 years of record at Acayucan, 1948 to 1981. 7 years have data for under 90 percent of days and are left out of rankings: 1948, 1951, 1956, 1957, 1961, 1969, 1981.

Days with data per year at Acayucan
Year	Days with data	Share of year	Complete
1948	115	31%	No
1949	361	99%	Yes
1950	357	98%	Yes
1951	325	89%	No
1952	358	98%	Yes
1953	357	98%	Yes
1954	343	94%	Yes
1955	352	96%	Yes
1956	295	81%	No
1957	270	74%	No
1961	302	83%	No
1962	365	100%	Yes
1963	364	100%	Yes
1964	365	100%	Yes
1965	365	100%	Yes
1966	364	100%	Yes
1967	363	99%	Yes
1968	365	100%	Yes
1969	301	82%	No
1970	365	100%	Yes
1971	364	100%	Yes
1972	366	100%	Yes
1973	365	100%	Yes
1974	365	100%	Yes
1975	364	100%	Yes
1976	366	100%	Yes
1977	365	100%	Yes
1978	363	99%	Yes
1979	365	100%	Yes
1980	364	99%	Yes
1981	120	33%	No

Latest Records

Latest records at Acayucan
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
26 April 1981	Acayucan, MX	daily rain	7.9 mm (0.31 in)	5.6 mm (0.22 in)	32 years	16 of 100 (Routine)
25 April 1981	Acayucan, MX	daily rain	11.7 mm (0.5 in)	1.8 mm (0.07 in)	28 years	12 of 100 (Routine)
13 February 1981	Acayucan, MX	monthly rain	50.8 mm (2.0 in)	4.6 mm (0.18 in)	15 years	22 of 100 (Routine)
12 January 1981	Acayucan, MX	daily rain	15.0 mm (0.6 in)	8.1 mm (0.32 in)	13 years	16 of 100 (Routine)
4 December 1980	Acayucan, MX	daily rain	20.8 mm (0.8 in)	15.0 mm (0.6 in)	2 years	16 of 100 (Routine)
3 December 1980	Acayucan, MX	daily rain	36.8 mm (1.4 in)	29.9 mm (1.2 in)	12 years	33 of 100 (Routine)
4 November 1980	Acayucan, MX	daily rain	29.0 mm (1.1 in)	8.2 mm (0.32 in)	11 years	12 of 100 (Routine)
26 September 1980	Acayucan, MX	daily rain	47.8 mm (1.9 in)	10.2 mm (0.4 in)	23 years	13 of 100 (Routine)
24 September 1980	Acayucan, MX	all-time rain	174.0 mm (6.9 in)	6.1 mm (0.24 in)	12 years	28 of 100 (Routine)
23 September 1980	Acayucan, MX	monthly rain	164.8 mm (6.5 in)	10.9 mm (0.4 in)	6 years	19 of 100 (Routine)
31 July 1980	Acayucan, MX	daily rain	24.9 mm (1.0 in)	4.8 mm (0.19 in)	10 years	8 of 100 (Routine)
9 July 1980	Acayucan, MX	daily rain	95.8 mm (3.8 in)	33.8 mm (1.3 in)	25 years	26 of 100 (Routine)
19 May 1980	Acayucan, MX	daily rain	15.0 mm (0.6 in)	2.0 mm (0.08 in)	16 years	8 of 100 (Routine)
13 April 1980	Acayucan, MX	daily rain	21.8 mm (0.9 in)	16.5 mm (0.6 in)	29 years	20 of 100 (Routine)
8 April 1980	Acayucan, MX	daily rain	39.9 mm (1.6 in)	26.2 mm (1.0 in)	26 years	33 of 100 (Routine)
23 February 1980	Acayucan, MX	daily rain	31.5 mm (1.2 in)	21.6 mm (0.9 in)	4 years	29 of 100 (Routine)
9 December 1979	Acayucan, MX	daily rain	46.0 mm (1.8 in)	19.6 mm (0.8 in)	4 years	21 of 100 (Routine)
10 September 1979	Acayucan, MX	daily rain	70.4 mm (2.8 in)	8.2 mm (0.32 in)	9 years	8 of 100 (Routine)
24 August 1979	Acayucan, MX	daily rain	48.3 mm (1.9 in)	23.4 mm (0.9 in)	13 years	20 of 100 (Routine)
4 August 1979	Acayucan, MX	daily rain	59.9 mm (2.4 in)	28.9 mm (1.1 in)	5 years	20 of 100 (Routine)

Climate Trend

24 complete years, 1949 to 1980

One stripe for each of 24 complete years at Acayucan, 1949 to 1980. Blue stripes are years cooler than the station's own mean of 25.7 C (78.2 F); red stripes are warmer. The coolest year was 1963, at 24.4 C (75.9 F), and the warmest was 1954, at 28.1 C (82.5 F). The strongest colour marks a difference of 2.4 C (4.3 F).

Annual mean temperature at Acayucan as warming stripes, 1949 to 1980
Year	Annual mean temperature	Difference from the station mean
1949	24.8 C	-0.84 C
1950	24.7 C	-0.98 C
1952	24.6 C	-1.08 C
1953	25.1 C	-0.60 C
1954	28.1 C	+2.39 C
1955	25.5 C	-0.16 C
1962	24.6 C	-1.07 C
1963	24.4 C	-1.27 C
1964	25.0 C	-0.67 C
1965	25.6 C	-0.08 C
1966	25.0 C	-0.71 C
1967	25.4 C	-0.29 C
1968	25.2 C	-0.51 C
1970	25.6 C	-0.03 C
1971	26.4 C	+0.77 C
1972	26.8 C	+1.16 C
1973	26.6 C	+0.97 C
1974	26.3 C	+0.63 C
1975	26.6 C	+0.92 C
1976	26.0 C	+0.28 C
1977	25.9 C	+0.27 C
1978	25.8 C	+0.10 C
1979	25.8 C	+0.15 C
1980	26.3 C	+0.61 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 1981

Yearly extremes at Acayucan: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	42.8 C (109.0 F)	1980	38.9 C (102.0 F)	31
Coldest night (TNn)	7.8 C (46.0 F)	1963	11.1 C (52.0 F)	31
Wettest day (Rx1day)	174.0 mm (6.9 in)	1980	99.1 mm (3.9 in)	34
Wettest five days (Rx5day)	465.4 mm (18.3 in)	1968	187.4 mm (7.4 in)	34
Longest dry spell (CDD)	78 days	1976	31 days	34

Hottest day (TXx)

The hottest day of the year at Acayucan, 1948 to 1981. The record is 42.8 C (109.0 F) in 1980, marked on the chart; the median year is 38.9 C (102.0 F).

Hottest day (TXx) at Acayucan by year
Year	Hottest day (TXx)
1948	36.7 C (98.1 F)
1949	35.6 C (96.1 F)
1950	38.3 C (100.9 F)
1951	39.4 C (102.9 F)
1952	37.8 C (100.0 F)
1953	38.9 C (102.0 F)
1954	40.0 C (104.0 F)
1955	39.4 C (102.9 F)
1956	35.6 C (96.1 F)
1957	40.0 C (104.0 F)
1958	n/a
1959	n/a
1960	n/a
1961	38.9 C (102.0 F)
1962	38.9 C (102.0 F)
1963	38.9 C (102.0 F)
1964	40.0 C (104.0 F)
1965	40.0 C (104.0 F)
1966	38.9 C (102.0 F)
1967	38.9 C (102.0 F)
1968	37.2 C (99.0 F)
1969	38.9 C (102.0 F)
1970	39.4 C (102.9 F)
1971	39.4 C (102.9 F)
1972	38.9 C (102.0 F)
1973	39.4 C (102.9 F)
1974	40.0 C (104.0 F)
1975	40.0 C (104.0 F)
1976	40.6 C (105.1 F)
1977	37.8 C (100.0 F)
1978	38.9 C (102.0 F)
1979	38.9 C (102.0 F)
1980	42.8 C (109.0 F)
1981	39.4 C (102.9 F)

Coldest night (TNn)

The coldest night of the year at Acayucan, 1948 to 1981. The record is 7.8 C (46.0 F) in 1963, marked on the chart; the median year is 11.1 C (52.0 F).

Coldest night (TNn) at Acayucan by year
Year	Coldest night (TNn)
1948	10.0 C (50.0 F)
1949	11.7 C (53.1 F)
1950	11.1 C (52.0 F)
1951	10.0 C (50.0 F)
1952	11.1 C (52.0 F)
1953	10.6 C (51.1 F)
1954	11.1 C (52.0 F)
1955	11.1 C (52.0 F)
1956	9.4 C (48.9 F)
1957	13.9 C (57.0 F)
1958	n/a
1959	n/a
1960	n/a
1961	10.6 C (51.1 F)
1962	10.6 C (51.1 F)
1963	7.8 C (46.0 F)
1964	10.6 C (51.1 F)
1965	12.8 C (55.0 F)
1966	11.7 C (53.1 F)
1967	10.6 C (51.1 F)
1968	12.8 C (55.0 F)
1969	12.8 C (55.0 F)
1970	10.0 C (50.0 F)
1971	11.7 C (53.1 F)
1972	14.4 C (57.9 F)
1973	11.7 C (53.1 F)
1974	11.7 C (53.1 F)
1975	10.0 C (50.0 F)
1976	11.1 C (52.0 F)
1977	11.7 C (53.1 F)
1978	11.7 C (53.1 F)
1979	10.6 C (51.1 F)
1980	12.8 C (55.0 F)
1981	12.8 C (55.0 F)

Wettest day (Rx1day)

The wettest day of the year at Acayucan, 1948 to 1981. The record is 174.0 mm (6.9 in) in 1980, marked on the chart; the median year is 99.1 mm (3.9 in).

Wettest day (Rx1day) at Acayucan by year
Year	Wettest day (Rx1day)
1948	32.3 mm (1.3 in)
1949	79.0 mm (3.1 in)
1950	98.3 mm (3.9 in)
1951	69.1 mm (2.7 in)
1952	78.0 mm (3.1 in)
1953	72.9 mm (2.9 in)
1954	141.2 mm (5.6 in)
1955	99.8 mm (3.9 in)
1956	87.9 mm (3.5 in)
1957	134.9 mm (5.3 in)
1958	98.3 mm (3.9 in)
1959	85.9 mm (3.4 in)
1960	108.0 mm (4.3 in)
1961	109.7 mm (4.3 in)
1962	57.4 mm (2.3 in)
1963	112.5 mm (4.4 in)
1964	123.4 mm (4.9 in)
1965	86.4 mm (3.4 in)
1966	123.2 mm (4.9 in)
1967	125.0 mm (4.9 in)
1968	167.9 mm (6.6 in)
1969	105.7 mm (4.2 in)
1970	74.9 mm (2.9 in)
1971	115.6 mm (4.6 in)
1972	88.9 mm (3.5 in)
1973	121.2 mm (4.8 in)
1974	153.9 mm (6.1 in)
1975	67.3 mm (2.6 in)
1976	107.2 mm (4.2 in)
1977	160.8 mm (6.3 in)
1978	85.9 mm (3.4 in)
1979	85.9 mm (3.4 in)
1980	174.0 mm (6.9 in)
1981	50.8 mm (2.0 in)

Wettest five days (Rx5day)

The wettest five days of the year at Acayucan, 1948 to 1981. The record is 465.4 mm (18.3 in) in 1968, marked on the chart; the median year is 187.4 mm (7.4 in).

Wettest five days (Rx5day) at Acayucan by year
Year	Wettest five days (Rx5day)
1948	68.9 mm (2.7 in)
1949	106.0 mm (4.2 in)
1950	213.8 mm (8.4 in)
1951	144.9 mm (5.7 in)
1952	160.9 mm (6.3 in)
1953	163.4 mm (6.4 in)
1954	181.0 mm (7.1 in)
1955	338.0 mm (13.3 in)
1956	161.7 mm (6.4 in)
1957	235.7 mm (9.3 in)
1958	238.2 mm (9.4 in)
1959	186.3 mm (7.3 in)
1960	243.4 mm (9.6 in)
1961	188.5 mm (7.4 in)
1962	119.5 mm (4.7 in)
1963	176.6 mm (7.0 in)
1964	213.0 mm (8.4 in)
1965	179.8 mm (7.1 in)
1966	222.4 mm (8.8 in)
1967	260.4 mm (10.3 in)
1968	465.4 mm (18.3 in)
1969	217.2 mm (8.6 in)
1970	169.3 mm (6.7 in)
1971	237.0 mm (9.3 in)
1972	224.0 mm (8.8 in)
1973	215.4 mm (8.5 in)
1974	271.2 mm (10.7 in)
1975	155.7 mm (6.1 in)
1976	132.9 mm (5.2 in)
1977	238.3 mm (9.4 in)
1978	129.5 mm (5.1 in)
1979	131.2 mm (5.2 in)
1980	427.3 mm (16.8 in)
1981	60.0 mm (2.4 in)

Longest dry spell (CDD)

The longest dry spell of the year at Acayucan, 1948 to 1981. The record is 78 days in 1976, marked on the chart; the median year is 31 days.

Longest dry spell (CDD) at Acayucan by year
Year	Longest dry spell (CDD)
1948	34 days
1949	28 days
1950	30 days
1951	41 days
1952	40 days
1953	35 days
1954	23 days
1955	30 days
1956	27 days
1957	39 days
1958	20 days
1959	30 days
1960	42 days
1961	32 days
1962	30 days
1963	29 days
1964	42 days
1965	29 days
1966	22 days
1967	34 days
1968	16 days
1969	38 days
1970	39 days
1971	35 days
1972	20 days
1973	41 days
1974	22 days
1975	38 days
1976	78 days
1977	23 days
1978	29 days
1979	18 days
1980	42 days
1981	32 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, 1949 to 1980

A day with at least 101.5 mm (4.0 in) of rain is expected about once in 2 years. A day with at least 202.2 mm (8.0 in) of rain is expected about once in 100 years.

Rainfall return levels at Acayucan: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	101.5 mm (4.0 in)
5 years	129.6 mm (5.1 in)
10 years	147.7 mm (5.8 in)
25 years	170.1 mm (6.7 in)
50 years	186.3 mm (7.3 in)	Longer than the 32 years of record
100 years	202.2 mm (8.0 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 1949 to 1980.

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: 174.0 mm (6.9 in) in 1980; 167.9 mm (6.6 in) in 1968; 160.8 mm (6.3 in) in 1977.

Download the Data

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