Cayo Arcas Weather Records (MXN00004005)

Record envelope, standing records and threshold days for Cayo Arcas (MXN00004005), Mexico, with 59 years of record.

Key Facts for Cayo Arcas

Cayo Arcas (MXN00004005) is a weather station in Mexico at 20.20 latitude and -91.95 longitude, 6 m (19 ft) above sea level.
The station reports from 1929 to 1987, 59 years of record.
1,464 records set at Cayo Arcas still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Cayo Arcas tied a daily record high maximum temperature of 33.9 C (93.0 F) on 31 May 1987.

About the Station

Location: Mexico, 20.20 latitude, -91.95 longitude.
Elevation: 6 m (19 ft).
Period of record: 1929 to 1987, 59 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 Cayo Arcas. 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 Cayo Arcas, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	38.3 C (100.9 F)	11.7 C (53.1 F)	n/a	n/a
Feb	35.0 C (95.0 F)	15.6 C (60.1 F)	n/a	n/a
Mar	33.9 C (93.0 F)	16.7 C (62.1 F)	n/a	n/a
Apr	37.8 C (100.0 F)	18.9 C (66.0 F)	n/a	n/a
May	38.9 C (102.0 F)	18.9 C (66.0 F)	n/a	n/a
Jun	36.1 C (97.0 F)	17.8 C (64.0 F)	n/a	n/a
Jul	38.9 C (102.0 F)	20.6 C (69.1 F)	n/a	n/a
Aug	38.9 C (102.0 F)	20.0 C (68.0 F)	n/a	n/a
Sep	37.2 C (99.0 F)	17.8 C (64.0 F)	n/a	n/a
Oct	39.4 C (102.9 F)	20.0 C (68.0 F)	n/a	n/a
Nov	35.0 C (95.0 F)	17.8 C (64.0 F)	n/a	n/a
Dec	38.9 C (102.0 F)	15.6 C (60.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Cayo Arcas still stand. 1977 holds the most, with 126.

Standing records at Cayo Arcas by the year they were set
Year set	Standing records
1929	22
1930	29
1931	37
1932	62
1933	32
1934	22
1935	30
1936	49
1937	94
1938	23
1939	22
1940	24
1941	11
1942	28
1943	68
1944	112
1961	9
1965	11
1966	73
1967	75
1968	49
1969	30
1970	77
1971	4
1972	10
1974	19
1975	54
1976	21
1977	126
1978	44
1979	44
1980	27
1981	1
1982	24
1983	12
1984	32
1985	12
1986	28
1987	17

Wettest Day of Each Month

Oct: 199.9 mm (7.9 in)

The wettest day on record for each calendar month at Cayo Arcas. The most was 199.9 mm (7.9 in) on 17 October 1939.

Record daily precipitation for each month at Cayo Arcas
Month	Record daily precipitation (mm)	Date
Jan	41.9 mm (1.6 in)	19 January 1975
Feb	59.9 mm (2.4 in)	23 February 1932
Mar	47.8 mm (1.9 in)	28 March 1957
Apr	34.8 mm (1.4 in)	4 April 1952
May	63.8 mm (2.5 in)	21 May 1958
Jun	195.8 mm (7.7 in)	9 June 1934
Jul	59.9 mm (2.4 in)	13 July 1931
Aug	65.8 mm (2.6 in)	1 August 1947
Sep	151.4 mm (6.0 in)	3 September 1975
Oct	199.9 mm (7.9 in)	17 October 1939
Nov	142.7 mm (5.6 in)	18 November 1938
Dec	93.0 mm (3.7 in)	27 December 1958

Period of Record Coverage

1929 to 1987

39 years of record at Cayo Arcas, 1929 to 1987. 12 years have data for under 90 percent of days and are left out of rankings: 1929, 1961, 1965, 1966, 1968, 1969, 1970, 1971 and others.

Days with data per year at Cayo Arcas
Year	Days with data	Share of year	Complete
1929	143	39%	No
1930	365	100%	Yes
1931	365	100%	Yes
1932	334	91%	Yes
1933	337	92%	Yes
1934	335	92%	Yes
1935	363	99%	Yes
1936	366	100%	Yes
1937	354	97%	Yes
1938	340	93%	Yes
1939	333	91%	Yes
1940	362	99%	Yes
1941	363	99%	Yes
1942	334	92%	Yes
1943	363	99%	Yes
1944	365	100%	Yes
1961	57	16%	No
1965	179	49%	No
1966	257	70%	No
1967	340	93%	Yes
1968	325	89%	No
1969	253	69%	No
1970	325	89%	No
1971	180	49%	No
1972	119	33%	No
1974	361	99%	Yes
1975	333	91%	Yes
1976	335	92%	Yes
1977	361	99%	Yes
1978	362	99%	Yes
1979	361	99%	Yes
1980	59	16%	No
1981	151	41%	No
1982	334	92%	Yes
1983	333	91%	Yes
1984	335	92%	Yes
1985	365	100%	Yes
1986	365	100%	Yes
1987	151	41%	No

Latest Records

Latest records at Cayo Arcas
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
31 May 1987	Cayo Arcas, MX	daily high max (Tie)	33.9 C (93.0 F)	tie	52 years	5 of 100 (Routine)
31 May 1987	Cayo Arcas, MX	daily high min (Tie)	27.8 C (82.0 F)	tie	54 years	5 of 100 (Routine)
28 May 1987	Cayo Arcas, MX	daily high max (Tie)	33.9 C (93.0 F)	tie	1 year	1 of 100 (Routine)
27 May 1987	Cayo Arcas, MX	daily high max	35.0 C (95.0 F)	0.6 C (1.1 F)	4 years	9 of 100 (Routine)
26 May 1987	Cayo Arcas, MX	daily high max	33.9 C (93.0 F)	0.6 C (1.1 F)	52 years	23 of 100 (Routine)
25 May 1987	Cayo Arcas, MX	daily high max (Tie)	33.9 C (93.0 F)	tie	50 years	5 of 100 (Routine)
21 May 1987	Cayo Arcas, MX	daily high max	33.9 C (93.0 F)	0.6 C (1.1 F)	1 year	8 of 100 (Routine)
10 May 1987	Cayo Arcas, MX	daily high max (Tie)	33.9 C (93.0 F)	tie	48 years	4 of 100 (Routine)
9 May 1987	Cayo Arcas, MX	daily high max	35.0 C (95.0 F)	2.2 C (4.0 F)	48 years	30 of 100 (Routine)
8 May 1987	Cayo Arcas, MX	daily high max (Tie)	35.0 C (95.0 F)	tie	44 years	4 of 100 (Routine)
6 May 1987	Cayo Arcas, MX	daily high max (Tie)	34.4 C (93.9 F)	tie	8 years	1 of 100 (Routine)
3 April 1987	Cayo Arcas, MX	daily rain	1.3 mm (0.05 in)	1.3 mm (0.05 in)	56 years	20 of 100 (Routine)
2 April 1987	Cayo Arcas, MX	daily low min	20.0 C (68.0 F)	0.6 C (1.1 F)	56 years	24 of 100 (Routine)
31 March 1987	Cayo Arcas, MX	daily low min	20.0 C (68.0 F)	0.6 C (1.1 F)	2 years	8 of 100 (Routine)
30 March 1987	Cayo Arcas, MX	daily low max (Tie)	25.0 C (77.0 F)	tie	56 years	5 of 100 (Routine)
8 March 1987	Cayo Arcas, MX	daily low min (Tie)	20.0 C (68.0 F)	tie	54 years	5 of 100 (Routine)
5 March 1987	Cayo Arcas, MX	daily rain	16.5 mm (0.6 in)	16.5 mm (0.6 in)	56 years	20 of 100 (Routine)
5 March 1987	Cayo Arcas, MX	daily low min (Tie)	20.0 C (68.0 F)	tie	56 years	5 of 100 (Routine)
4 March 1987	Cayo Arcas, MX	daily rain	7.6 mm (0.30 in)	7.6 mm (0.30 in)	56 years	20 of 100 (Routine)
3 March 1987	Cayo Arcas, MX	daily rain	3.3 mm (0.13 in)	3.3 mm (0.13 in)	56 years	20 of 100 (Routine)

Climate Trend

15 complete years, 1930 to 1986

One stripe for each of 15 complete years at Cayo Arcas, 1930 to 1986. Blue stripes are years cooler than the station's own mean of 27.3 C (81.1 F); red stripes are warmer. The coolest year was 1943, at 26.0 C (78.7 F), and the warmest was 1977, at 28.3 C (83.0 F). The strongest colour marks a difference of 1.3 C (2.3 F).

Annual mean temperature at Cayo Arcas as warming stripes, 1930 to 1986
Year	Annual mean temperature	Difference from the station mean
1930	26.8 C	-0.46 C
1931	26.3 C	-0.95 C
1935	27.7 C	+0.38 C
1936	27.8 C	+0.50 C
1937	26.9 C	-0.36 C
1940	27.0 C	-0.29 C
1941	27.7 C	+0.40 C
1943	26.0 C	-1.30 C
1967	26.6 C	-0.68 C
1974	27.4 C	+0.09 C
1977	28.3 C	+1.04 C
1978	27.4 C	+0.13 C
1979	28.2 C	+0.89 C
1985	27.3 C	-0.01 C
1986	27.9 C	+0.59 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

1929 to 1987

Yearly extremes at Cayo Arcas: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	39.4 C (102.9 F)	1931	35.6 C (96.1 F)	39
Coldest night (TNn)	11.7 C (53.1 F)	1944	18.9 C (66.0 F)	39
Wettest day (Rx1day)	199.9 mm (7.9 in)	1939	46.4 mm (1.8 in)	52
Wettest five days (Rx5day)	331.6 mm (13.1 in)	1934	77.6 mm (3.1 in)	52
Longest dry spell (CDD)	252 days	1941	84 days	52

Hottest day (TXx)

The hottest day of the year at Cayo Arcas, 1929 to 1987. The record is 39.4 C (102.9 F) in 1931, marked on the chart; the median year is 35.6 C (96.1 F).

Hottest day (TXx) at Cayo Arcas by year
Year	Hottest day (TXx)
1929	32.8 C (91.0 F)
1930	32.8 C (91.0 F)
1931	39.4 C (102.9 F)
1932	33.9 C (93.0 F)
1933	33.3 C (91.9 F)
1934	34.4 C (93.9 F)
1935	36.1 C (97.0 F)
1936	37.8 C (100.0 F)
1937	35.6 C (96.1 F)
1938	32.8 C (91.0 F)
1939	37.8 C (100.0 F)
1940	35.6 C (96.1 F)
1941	35.0 C (95.0 F)
1942	38.9 C (102.0 F)
1943	38.9 C (102.0 F)
1944	36.7 C (98.1 F)
1947	n/a
1948	n/a
1949	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
1961	31.7 C (89.1 F)
1965	38.9 C (102.0 F)
1966	35.6 C (96.1 F)
1967	32.8 C (91.0 F)
1968	38.9 C (102.0 F)
1969	32.8 C (91.0 F)
1970	31.7 C (89.1 F)
1971	32.8 C (91.0 F)
1972	36.7 C (98.1 F)
1974	32.8 C (91.0 F)
1975	34.4 C (93.9 F)
1976	34.4 C (93.9 F)
1977	37.2 C (99.0 F)
1978	38.9 C (102.0 F)
1979	36.7 C (98.1 F)
1980	30.6 C (87.1 F)
1981	35.0 C (95.0 F)
1982	35.0 C (95.0 F)
1983	38.9 C (102.0 F)
1984	38.9 C (102.0 F)
1985	35.6 C (96.1 F)
1986	35.6 C (96.1 F)
1987	35.0 C (95.0 F)

Coldest night (TNn)

The coldest night of the year at Cayo Arcas, 1929 to 1987. The record is 11.7 C (53.1 F) in 1944, marked on the chart; the median year is 18.9 C (66.0 F).

Coldest night (TNn) at Cayo Arcas by year
Year	Coldest night (TNn)
1929	18.3 C (64.9 F)
1930	18.9 C (66.0 F)
1931	17.8 C (64.0 F)
1932	17.8 C (64.0 F)
1933	17.8 C (64.0 F)
1934	18.3 C (64.9 F)
1935	16.1 C (61.0 F)
1936	15.6 C (60.1 F)
1937	18.9 C (66.0 F)
1938	20.0 C (68.0 F)
1939	18.9 C (66.0 F)
1940	17.8 C (64.0 F)
1941	17.8 C (64.0 F)
1942	18.9 C (66.0 F)
1943	18.9 C (66.0 F)
1944	11.7 C (53.1 F)
1947	n/a
1948	n/a
1949	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
1961	20.6 C (69.1 F)
1965	20.0 C (68.0 F)
1966	20.0 C (68.0 F)
1967	15.0 C (59.0 F)
1968	18.9 C (66.0 F)
1969	20.0 C (68.0 F)
1970	17.8 C (64.0 F)
1971	21.7 C (71.1 F)
1972	20.6 C (69.1 F)
1974	20.0 C (68.0 F)
1975	20.0 C (68.0 F)
1976	15.6 C (60.1 F)
1977	18.9 C (66.0 F)
1978	16.7 C (62.1 F)
1979	18.9 C (66.0 F)
1980	20.6 C (69.1 F)
1981	21.7 C (71.1 F)
1982	18.9 C (66.0 F)
1983	15.6 C (60.1 F)
1984	16.7 C (62.1 F)
1985	16.7 C (62.1 F)
1986	16.7 C (62.1 F)
1987	19.4 C (66.9 F)

Wettest day (Rx1day)

The wettest day of the year at Cayo Arcas, 1929 to 1987. The record is 199.9 mm (7.9 in) in 1939, marked on the chart; the median year is 46.4 mm (1.8 in).

Wettest day (Rx1day) at Cayo Arcas by year
Year	Wettest day (Rx1day)
1929	105.9 mm (4.2 in)
1930	67.8 mm (2.7 in)
1931	100.3 mm (3.9 in)
1932	59.9 mm (2.4 in)
1933	89.9 mm (3.5 in)
1934	195.8 mm (7.7 in)
1935	39.9 mm (1.6 in)
1936	145.3 mm (5.7 in)
1937	39.9 mm (1.6 in)
1938	142.7 mm (5.6 in)
1939	199.9 mm (7.9 in)
1940	40.9 mm (1.6 in)
1941	15.0 mm (0.6 in)
1942	19.8 mm (0.8 in)
1943	2.3 mm (0.09 in)
1944	25.9 mm (1.0 in)
1947	90.7 mm (3.6 in)
1948	60.2 mm (2.4 in)
1949	80.3 mm (3.2 in)
1950	79.8 mm (3.1 in)
1951	60.7 mm (2.4 in)
1952	34.8 mm (1.4 in)
1953	17.3 mm (0.7 in)
1954	7.9 mm (0.31 in)
1955	84.8 mm (3.3 in)
1956	43.9 mm (1.7 in)
1957	47.8 mm (1.9 in)
1958	93.0 mm (3.7 in)
1959	48.8 mm (1.9 in)
1961	0.0 mm (0.00 in)
1965	82.8 mm (3.3 in)
1966	30.0 mm (1.2 in)
1967	54.9 mm (2.2 in)
1968	17.8 mm (0.7 in)
1969	77.0 mm (3.0 in)
1970	69.9 mm (2.8 in)
1971	45.0 mm (1.8 in)
1972	39.9 mm (1.6 in)
1974	69.9 mm (2.8 in)
1975	151.4 mm (6.0 in)
1976	62.0 mm (2.4 in)
1977	11.9 mm (0.5 in)
1978	47.8 mm (1.9 in)
1979	35.8 mm (1.4 in)
1980	0.0 mm (0.00 in)
1981	19.8 mm (0.8 in)
1982	19.8 mm (0.8 in)
1983	19.8 mm (0.8 in)
1984	19.8 mm (0.8 in)
1985	19.8 mm (0.8 in)
1986	19.8 mm (0.8 in)
1987	16.5 mm (0.6 in)

Wettest five days (Rx5day)

The wettest five days of the year at Cayo Arcas, 1929 to 1987. The record is 331.6 mm (13.1 in) in 1934, marked on the chart; the median year is 77.6 mm (3.1 in).

Wettest five days (Rx5day) at Cayo Arcas by year
Year	Wettest five days (Rx5day)
1929	173.3 mm (6.8 in)
1930	113.6 mm (4.5 in)
1931	100.3 mm (3.9 in)
1932	102.3 mm (4.0 in)
1933	148.6 mm (5.9 in)
1934	331.6 mm (13.1 in)
1935	79.9 mm (3.1 in)
1936	273.6 mm (10.8 in)
1937	84.9 mm (3.3 in)
1938	142.7 mm (5.6 in)
1939	216.7 mm (8.5 in)
1940	74.7 mm (2.9 in)
1941	19.9 mm (0.8 in)
1942	41.0 mm (1.6 in)
1943	2.3 mm (0.09 in)
1944	56.7 mm (2.2 in)
1947	136.4 mm (5.4 in)
1948	143.0 mm (5.6 in)
1949	116.5 mm (4.6 in)
1950	170.5 mm (6.7 in)
1951	111.3 mm (4.4 in)
1952	34.8 mm (1.4 in)
1953	17.8 mm (0.7 in)
1954	9.2 mm (0.36 in)
1955	130.8 mm (5.1 in)
1956	90.6 mm (3.6 in)
1957	67.9 mm (2.7 in)
1958	143.6 mm (5.7 in)
1959	54.4 mm (2.1 in)
1961	0.0 mm (0.00 in)
1965	119.6 mm (4.7 in)
1966	33.8 mm (1.3 in)
1967	121.4 mm (4.8 in)
1968	18.6 mm (0.7 in)
1969	97.6 mm (3.8 in)
1970	69.9 mm (2.8 in)
1971	51.1 mm (2.0 in)
1972	42.7 mm (1.7 in)
1974	116.1 mm (4.6 in)
1975	151.4 mm (6.0 in)
1976	120.5 mm (4.7 in)
1977	18.3 mm (0.7 in)
1978	88.0 mm (3.5 in)
1979	75.2 mm (3.0 in)
1980	0.0 mm (0.00 in)
1981	32.6 mm (1.3 in)
1982	66.3 mm (2.6 in)
1983	62.0 mm (2.4 in)
1984	35.8 mm (1.4 in)
1985	40.7 mm (1.6 in)
1986	41.9 mm (1.6 in)
1987	28.4 mm (1.1 in)

Longest dry spell (CDD)

The longest dry spell of the year at Cayo Arcas, 1929 to 1987. The record is 252 days in 1941, marked on the chart; the median year is 84 days.

Longest dry spell (CDD) at Cayo Arcas by year
Year	Longest dry spell (CDD)
1929	15 days
1930	59 days
1931	52 days
1932	197 days
1933	137 days
1934	49 days
1935	106 days
1936	39 days
1937	101 days
1938	127 days
1939	91 days
1940	171 days
1941	252 days
1942	162 days
1943	170 days
1944	156 days
1947	74 days
1948	74 days
1949	134 days
1950	72 days
1951	151 days
1952	34 days
1953	109 days
1954	143 days
1955	74 days
1956	38 days
1957	42 days
1958	63 days
1959	71 days
1961	30 days
1965	53 days
1966	89 days
1967	77 days
1968	165 days
1969	111 days
1970	122 days
1971	31 days
1972	20 days
1974	134 days
1975	132 days
1976	137 days
1977	196 days
1978	153 days
1979	64 days
1980	31 days
1981	15 days
1982	143 days
1983	78 days
1984	93 days
1985	61 days
1986	38 days
1987	58 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

41 years, 1930 to 1986

A day with at least 50.5 mm (2.0 in) of rain is expected about once in 2 years. A day with at least 247.8 mm (9.8 in) of rain is expected about once in 100 years.

Rainfall return levels at Cayo Arcas: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	50.5 mm (2.0 in)
5 years	92.2 mm (3.6 in)
10 years	123.8 mm (4.9 in)
25 years	168.9 mm (6.6 in)
50 years	206.5 mm (8.1 in)	Longer than the 41 years of record
100 years	247.8 mm (9.8 in)	Longer than the 41 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, 41 years of values from 1930 to 1986.

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: 199.9 mm (7.9 in) in 1939; 195.8 mm (7.7 in) in 1934; 151.4 mm (6.0 in) in 1975.

Download the Data

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