Zacapu (Smn) Weather Records (MXN00016171)

Record envelope, standing records and threshold days for Zacapu (Smn) (MXN00016171), Mexico, with 79 years of record.

Key Facts for Zacapu (Smn)

Zacapu (Smn) (MXN00016171) is a weather station in Mexico at 19.82 latitude and -101.78 longitude, 1,994 m (6,541 ft) above sea level.
The station reports from 1923 to 2001, 79 years of record.
1,464 records set at Zacapu (Smn) still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Zacapu (Smn) set a daily record precipitation of 39.9 mm (1.6 in) on 24 September 2001.

About the Station

Location: Mexico, 19.82 latitude, -101.78 longitude.
Elevation: 1,994 m (6,541 ft).
Period of record: 1923 to 2001, 79 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 Zacapu (Smn). 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 Zacapu (Smn), with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	31.7 C (89.1 F)	-5.0 C (23.0 F)	n/a	n/a
Feb	34.4 C (93.9 F)	-6.1 C (21.0 F)	n/a	n/a
Mar	35.6 C (96.1 F)	-1.1 C (30.0 F)	n/a	n/a
Apr	37.2 C (99.0 F)	0.0 C (32.0 F)	n/a	n/a
May	37.2 C (99.0 F)	1.7 C (35.1 F)	n/a	n/a
Jun	36.7 C (98.1 F)	5.0 C (41.0 F)	n/a	n/a
Jul	32.8 C (91.0 F)	2.8 C (37.0 F)	n/a	n/a
Aug	32.8 C (91.0 F)	3.9 C (39.0 F)	n/a	n/a
Sep	32.8 C (91.0 F)	0.6 C (33.1 F)	n/a	n/a
Oct	31.1 C (88.0 F)	-6.7 C (19.9 F)	n/a	n/a
Nov	35.6 C (96.1 F)	-4.4 C (24.1 F)	n/a	n/a
Dec	36.7 C (98.1 F)	-3.3 C (26.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Zacapu (Smn) still stand. 1951 holds the most, with 120.

Standing records at Zacapu (Smn) by the year they were set
Year set	Standing records
1923	75
1924	55
1925	61
1926	35
1927	27
1928	25
1929	26
1930	30
1931	26
1932	32
1933	19
1934	17
1935	20
1936	21
1937	8
1938	5
1939	12
1940	25
1941	49
1942	22
1943	2
1944	64
1945	46
1946	46
1947	24
1948	91
1949	52
1950	78
1951	120
1952	53
1953	26
1954	23
1955	10
1956	15
1957	26
1958	15
1959	14
1960	14
1961	9
1962	5
1963	18
1964	13
1965	17
1966	17
1967	19
1968	13
1969	14
2000	12
2001	18

All-Time Record Progression

1 new records

1 all-time records were set at Zacapu (Smn) between 19 January 1958 and 19 January 1958. Each dot is a new record.

Wettest Day of Each Month

Aug: 86.6 mm (3.4 in)

The wettest day on record for each calendar month at Zacapu (Smn). The most was 86.6 mm (3.4 in) on 16 August 1937.

Record daily precipitation for each month at Zacapu (Smn)
Month	Record daily precipitation (mm)	Date
Jan	51.8 mm (2.0 in)	9 January 1960
Feb	20.3 mm (0.8 in)	21 February 1959
Mar	16.0 mm (0.6 in)	5 March 1968
Apr	43.9 mm (1.7 in)	29 April 1965
May	49.3 mm (1.9 in)	30 May 1952
Jun	60.5 mm (2.4 in)	14 June 2000
Jul	64.8 mm (2.6 in)	4 July 1923
Aug	86.6 mm (3.4 in)	16 August 1937
Sep	68.8 mm (2.7 in)	13 September 1954
Oct	81.8 mm (3.2 in)	12 October 1960
Nov	46.5 mm (1.8 in)	4 November 1952
Dec	42.9 mm (1.7 in)	16 December 1925

Period of Record Coverage

1923 to 2001

49 years of record at Zacapu (Smn), 1923 to 2001. 6 years have data for under 90 percent of days and are left out of rankings: 1924, 1935, 1943, 1944, 1969, 2001.

Days with data per year at Zacapu (Smn)
Year	Days with data	Share of year	Complete
1923	354	97%	Yes
1924	305	83%	No
1925	363	99%	Yes
1926	365	100%	Yes
1927	365	100%	Yes
1928	366	100%	Yes
1929	362	99%	Yes
1930	365	100%	Yes
1931	363	99%	Yes
1932	335	92%	Yes
1933	363	99%	Yes
1934	365	100%	Yes
1935	212	58%	No
1936	366	100%	Yes
1937	365	100%	Yes
1938	365	100%	Yes
1939	365	100%	Yes
1940	366	100%	Yes
1941	365	100%	Yes
1942	364	100%	Yes
1943	59	16%	No
1944	111	30%	No
1945	365	100%	Yes
1946	365	100%	Yes
1947	364	100%	Yes
1948	366	100%	Yes
1949	365	100%	Yes
1950	362	99%	Yes
1951	346	95%	Yes
1952	364	99%	Yes
1953	365	100%	Yes
1954	365	100%	Yes
1955	365	100%	Yes
1956	366	100%	Yes
1957	365	100%	Yes
1958	365	100%	Yes
1959	365	100%	Yes
1960	366	100%	Yes
1961	365	100%	Yes
1962	365	100%	Yes
1963	365	100%	Yes
1964	365	100%	Yes
1965	364	100%	Yes
1966	365	100%	Yes
1967	365	100%	Yes
1968	366	100%	Yes
1969	211	58%	No
2000	339	93%	Yes
2001	261	72%	No

Latest Records

Latest records at Zacapu (Smn)
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
24 September 2001	Zacapu (Smn), MX	daily rain	39.9 mm (1.6 in)	18.1 mm (0.7 in)	58 years	43 of 100 (Notable)
23 September 2001	Zacapu (Smn), MX	daily rain	42.2 mm (1.7 in)	16.8 mm (0.7 in)	39 years	36 of 100 (Notable)
21 September 2001	Zacapu (Smn), MX	daily high max	30.0 C (86.0 F)	1.1 C (2.0 F)	52 years	26 of 100 (Routine)
20 September 2001	Zacapu (Smn), MX	daily high max (Tie)	28.9 C (84.0 F)	tie	52 years	5 of 100 (Routine)
17 September 2001	Zacapu (Smn), MX	daily high max	30.0 C (86.0 F)	1.1 C (2.0 F)	50 years	26 of 100 (Routine)
22 August 2001	Zacapu (Smn), MX	daily high max (Tie)	28.9 C (84.0 F)	tie	48 years	5 of 100 (Routine)
21 August 2001	Zacapu (Smn), MX	daily high max	30.0 C (86.0 F)	2.2 C (4.0 F)	48 years	30 of 100 (Routine)
21 August 2001	Zacapu (Smn), MX	daily high min (Tie)	13.9 C (57.0 F)	tie	76 years	7 of 100 (Routine)
19 August 2001	Zacapu (Smn), MX	daily high max	28.9 C (84.0 F)	0.6 C (1.1 F)	56 years	25 of 100 (Routine)
18 August 2001	Zacapu (Smn), MX	daily high max	30.0 C (86.0 F)	1.7 C (3.1 F)	44 years	27 of 100 (Routine)
18 August 2001	Zacapu (Smn), MX	daily high min (Tie)	13.9 C (57.0 F)	tie	56 years	6 of 100 (Routine)
15 August 2001	Zacapu (Smn), MX	daily high max (Tie)	28.9 C (84.0 F)	tie	52 years	5 of 100 (Routine)
13 August 2001	Zacapu (Smn), MX	daily high max (Tie)	28.9 C (84.0 F)	tie	32 years	4 of 100 (Routine)
12 August 2001	Zacapu (Smn), MX	daily high max (Tie)	28.9 C (84.0 F)	tie	36 years	4 of 100 (Routine)
10 August 2001	Zacapu (Smn), MX	daily high max (Tie)	27.8 C (82.0 F)	tie	48 years	5 of 100 (Routine)
6 August 2001	Zacapu (Smn), MX	daily high max	30.0 C (86.0 F)	1.7 C (3.1 F)	34 years	24 of 100 (Routine)
3 August 2001	Zacapu (Smn), MX	daily high max (Tie)	28.9 C (84.0 F)	tie	44 years	5 of 100 (Routine)
1 August 2001	Zacapu (Smn), MX	daily high max (Tie)	28.9 C (84.0 F)	tie	48 years	5 of 100 (Routine)
28 July 2001	Zacapu (Smn), MX	daily high min (Tie)	13.9 C (57.0 F)	tie	64 years	6 of 100 (Routine)
24 July 2001	Zacapu (Smn), MX	daily high max	30.0 C (86.0 F)	1.1 C (2.0 F)	52 years	26 of 100 (Routine)

Climate Trend

40 complete years, 1923 to 2000

One stripe for each of 40 complete years at Zacapu (Smn), 1923 to 2000. Blue stripes are years cooler than the station's own mean of 16.6 C (61.8 F); red stripes are warmer. The coolest year was 1931, at 14.4 C (57.9 F), and the warmest was 1948, at 18.8 C (65.9 F). The strongest colour marks a difference of 2.3 C (4.1 F).

Annual mean temperature at Zacapu (Smn) as warming stripes, 1923 to 2000
Year	Annual mean temperature	Difference from the station mean
1923	16.2 C	-0.34 C
1925	15.1 C	-1.50 C
1926	15.0 C	-1.56 C
1927	14.7 C	-1.84 C
1928	14.8 C	-1.74 C
1929	14.5 C	-2.08 C
1930	14.7 C	-1.87 C
1931	14.4 C	-2.16 C
1933	17.2 C	+0.65 C
1934	16.5 C	-0.05 C
1936	17.0 C	+0.40 C
1937	16.7 C	+0.15 C
1938	16.2 C	-0.33 C
1939	16.4 C	-0.18 C
1940	16.4 C	-0.18 C
1941	16.6 C	+0.06 C
1942	15.8 C	-0.73 C
1945	18.1 C	+1.49 C
1946	18.0 C	+1.45 C
1947	17.8 C	+1.23 C
1948	18.8 C	+2.28 C
1950	15.7 C	-0.88 C
1952	17.3 C	+0.70 C
1953	16.7 C	+0.11 C
1954	16.8 C	+0.21 C
1955	17.1 C	+0.50 C
1956	16.7 C	+0.11 C
1957	17.7 C	+1.14 C
1958	17.1 C	+0.49 C
1959	16.7 C	+0.17 C
1960	17.1 C	+0.57 C
1961	16.9 C	+0.38 C
1962	17.3 C	+0.74 C
1963	17.1 C	+0.49 C
1964	17.1 C	+0.58 C
1965	17.0 C	+0.42 C
1966	16.9 C	+0.32 C
1967	16.6 C	+0.06 C
1968	16.7 C	+0.17 C
2000	17.2 C	+0.66 C

The annual mean temperature here has risen by 0.4 C (0.2 to 0.5) per decade over 1923 to 2000. In Fahrenheit: 0.6 F (0.3 to 1.0) per decade. The slope is a straight line fitted to 40 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Zacapu (Smn)
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.4 C (0.2 to 0.5) per decade	0.6 F (0.3 to 1.0) per decade	1923 to 2000	40	Rise
Mean daily maximum	0.9 C (0.6 to 1.1) per decade	1.5 F (1.0 to 2.1) per decade	1923 to 2000	40	Rise
Mean daily minimum	-0.13 C (-0.28 to 0.02) per decade	-0.24 F (-0.50 to 0.03) per decade	1923 to 2000	40	Not clearly different from zero

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

1923 to 2001

Yearly extremes at Zacapu (Smn): the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	37.2 C (99.0 F)	1936	33.9 C (93.0 F)	49
Coldest night (TNn)	-6.7 C (19.9 F)	1944	-1.1 C (30.0 F)	49
Wettest day (Rx1day)	86.6 mm (3.4 in)	1937	45.0 mm (1.8 in)	49
Wettest five days (Rx5day)	197.1 mm (7.8 in)	1924	87.4 mm (3.4 in)	49
Longest dry spell (CDD)	167 days	1969	59 days	49

Hottest day (TXx)

The hottest day of the year at Zacapu (Smn), 1923 to 2001. The record is 37.2 C (99.0 F) in 1936, marked on the chart; the median year is 33.9 C (93.0 F).

Hottest day (TXx) at Zacapu (Smn) by year
Year	Hottest day (TXx)
1923	30.0 C (86.0 F)
1924	31.7 C (89.1 F)
1925	30.6 C (87.1 F)
1926	27.8 C (82.0 F)
1927	30.6 C (87.1 F)
1928	30.0 C (86.0 F)
1929	29.4 C (84.9 F)
1930	30.0 C (86.0 F)
1931	30.0 C (86.0 F)
1932	31.7 C (89.1 F)
1933	34.4 C (93.9 F)
1934	33.3 C (91.9 F)
1935	33.9 C (93.0 F)
1936	37.2 C (99.0 F)
1937	33.9 C (93.0 F)
1938	30.6 C (87.1 F)
1939	31.1 C (88.0 F)
1940	31.7 C (89.1 F)
1941	31.7 C (89.1 F)
1942	33.9 C (93.0 F)
1943	26.7 C (80.1 F)
1944	30.0 C (86.0 F)
1945	32.8 C (91.0 F)
1946	35.6 C (96.1 F)
1947	33.3 C (91.9 F)
1948	37.2 C (99.0 F)
1949	35.6 C (96.1 F)
1950	33.9 C (93.0 F)
1951	36.7 C (98.1 F)
1952	35.6 C (96.1 F)
1953	35.0 C (95.0 F)
1954	35.6 C (96.1 F)
1955	33.9 C (93.0 F)
1956	32.8 C (91.0 F)
1957	33.9 C (93.0 F)
1958	33.9 C (93.0 F)
1959	32.8 C (91.0 F)
1960	32.8 C (91.0 F)
1961	33.9 C (93.0 F)
1962	33.9 C (93.0 F)
1963	33.9 C (93.0 F)
1964	35.6 C (96.1 F)
1965	35.0 C (95.0 F)
1966	33.9 C (93.0 F)
1967	35.0 C (95.0 F)
1968	33.3 C (91.9 F)
1969	36.7 C (98.1 F)
2000	35.0 C (95.0 F)
2001	35.0 C (95.0 F)

Coldest night (TNn)

The coldest night of the year at Zacapu (Smn), 1923 to 2001. The record is -6.7 C (19.9 F) in 1944, marked on the chart; the median year is -1.1 C (30.0 F).

Coldest night (TNn) at Zacapu (Smn) by year
Year	Coldest night (TNn)
1923	4.4 C (39.9 F)
1924	0.0 C (32.0 F)
1925	0.0 C (32.0 F)
1926	-1.7 C (28.9 F)
1927	-1.1 C (30.0 F)
1928	-1.1 C (30.0 F)
1929	-1.1 C (30.0 F)
1930	-1.7 C (28.9 F)
1931	-1.1 C (30.0 F)
1932	-4.4 C (24.1 F)
1933	0.0 C (32.0 F)
1934	-1.1 C (30.0 F)
1935	-6.1 C (21.0 F)
1936	1.1 C (34.0 F)
1937	-0.6 C (30.9 F)
1938	-1.1 C (30.0 F)
1939	-1.7 C (28.9 F)
1940	-5.6 C (21.9 F)
1941	-2.2 C (28.0 F)
1942	-1.7 C (28.9 F)
1943	-1.7 C (28.9 F)
1944	-6.7 C (19.9 F)
1945	-3.3 C (26.1 F)
1946	-2.2 C (28.0 F)
1947	0.0 C (32.0 F)
1948	0.6 C (33.1 F)
1949	-3.3 C (26.1 F)
1950	-2.8 C (27.0 F)
1951	-5.0 C (23.0 F)
1952	-0.6 C (30.9 F)
1953	-3.9 C (25.0 F)
1954	-3.3 C (26.1 F)
1955	-0.6 C (30.9 F)
1956	-1.1 C (30.0 F)
1957	-2.8 C (27.0 F)
1958	-0.6 C (30.9 F)
1959	-0.6 C (30.9 F)
1960	-4.4 C (24.1 F)
1961	0.0 C (32.0 F)
1962	0.0 C (32.0 F)
1963	-1.1 C (30.0 F)
1964	0.0 C (32.0 F)
1965	-1.7 C (28.9 F)
1966	0.0 C (32.0 F)
1967	0.0 C (32.0 F)
1968	-1.1 C (30.0 F)
1969	0.0 C (32.0 F)
2000	-2.2 C (28.0 F)
2001	-1.1 C (30.0 F)

Wettest day (Rx1day)

The wettest day of the year at Zacapu (Smn), 1923 to 2001. The record is 86.6 mm (3.4 in) in 1937, marked on the chart; the median year is 45.0 mm (1.8 in).

Wettest day (Rx1day) at Zacapu (Smn) by year
Year	Wettest day (Rx1day)
1923	64.8 mm (2.6 in)
1924	50.8 mm (2.0 in)
1925	42.9 mm (1.7 in)
1926	40.9 mm (1.6 in)
1927	31.8 mm (1.3 in)
1928	45.0 mm (1.8 in)
1929	62.5 mm (2.5 in)
1930	33.8 mm (1.3 in)
1931	34.8 mm (1.4 in)
1932	31.8 mm (1.3 in)
1933	34.3 mm (1.4 in)
1934	44.5 mm (1.8 in)
1935	30.5 mm (1.2 in)
1936	34.3 mm (1.4 in)
1937	86.6 mm (3.4 in)
1938	23.4 mm (0.9 in)
1939	46.5 mm (1.8 in)
1940	37.3 mm (1.5 in)
1941	45.0 mm (1.8 in)
1942	66.3 mm (2.6 in)
1943	56.9 mm (2.2 in)
1944	25.9 mm (1.0 in)
1945	46.0 mm (1.8 in)
1946	46.5 mm (1.8 in)
1947	40.9 mm (1.6 in)
1948	42.9 mm (1.7 in)
1949	30.0 mm (1.2 in)
1950	33.8 mm (1.3 in)
1951	49.3 mm (1.9 in)
1952	49.3 mm (1.9 in)
1953	32.8 mm (1.3 in)
1954	68.8 mm (2.7 in)
1955	49.3 mm (1.9 in)
1956	46.5 mm (1.8 in)
1957	31.5 mm (1.2 in)
1958	38.6 mm (1.5 in)
1959	48.3 mm (1.9 in)
1960	81.8 mm (3.2 in)
1961	57.2 mm (2.3 in)
1962	39.9 mm (1.6 in)
1963	29.5 mm (1.2 in)
1964	58.9 mm (2.3 in)
1965	50.8 mm (2.0 in)
1966	47.0 mm (1.9 in)
1967	50.3 mm (2.0 in)
1968	57.4 mm (2.3 in)
1969	39.9 mm (1.6 in)
2000	60.5 mm (2.4 in)
2001	60.2 mm (2.4 in)

Wettest five days (Rx5day)

The wettest five days of the year at Zacapu (Smn), 1923 to 2001. The record is 197.1 mm (7.8 in) in 1924, marked on the chart; the median year is 87.4 mm (3.4 in).

Wettest five days (Rx5day) at Zacapu (Smn) by year
Year	Wettest five days (Rx5day)
1923	159.6 mm (6.3 in)
1924	197.1 mm (7.8 in)
1925	87.4 mm (3.4 in)
1926	77.3 mm (3.0 in)
1927	81.0 mm (3.2 in)
1928	75.5 mm (3.0 in)
1929	99.2 mm (3.9 in)
1930	74.5 mm (2.9 in)
1931	75.8 mm (3.0 in)
1932	65.9 mm (2.6 in)
1933	63.4 mm (2.5 in)
1934	88.0 mm (3.5 in)
1935	77.7 mm (3.1 in)
1936	95.5 mm (3.8 in)
1937	108.7 mm (4.3 in)
1938	50.6 mm (2.0 in)
1939	66.8 mm (2.6 in)
1940	68.8 mm (2.7 in)
1941	99.1 mm (3.9 in)
1942	116.1 mm (4.6 in)
1943	103.1 mm (4.1 in)
1944	55.2 mm (2.2 in)
1945	59.3 mm (2.3 in)
1946	67.1 mm (2.6 in)
1947	70.6 mm (2.8 in)
1948	129.4 mm (5.1 in)
1949	75.7 mm (3.0 in)
1950	94.4 mm (3.7 in)
1951	72.2 mm (2.8 in)
1952	104.6 mm (4.1 in)
1953	51.9 mm (2.0 in)
1954	83.3 mm (3.3 in)
1955	93.3 mm (3.7 in)
1956	81.6 mm (3.2 in)
1957	53.6 mm (2.1 in)
1958	104.9 mm (4.1 in)
1959	91.0 mm (3.6 in)
1960	88.7 mm (3.5 in)
1961	124.3 mm (4.9 in)
1962	113.8 mm (4.5 in)
1963	76.0 mm (3.0 in)
1964	66.3 mm (2.6 in)
1965	131.8 mm (5.2 in)
1966	98.7 mm (3.9 in)
1967	128.0 mm (5.0 in)
1968	145.6 mm (5.7 in)
1969	89.1 mm (3.5 in)
2000	87.2 mm (3.4 in)
2001	105.0 mm (4.1 in)

Longest dry spell (CDD)

The longest dry spell of the year at Zacapu (Smn), 1923 to 2001. The record is 167 days in 1969, marked on the chart; the median year is 59 days.

Longest dry spell (CDD) at Zacapu (Smn) by year
Year	Longest dry spell (CDD)
1923	47 days
1924	85 days
1925	50 days
1926	62 days
1927	51 days
1928	53 days
1929	93 days
1930	55 days
1931	83 days
1932	89 days
1933	134 days
1934	43 days
1935	63 days
1936	38 days
1937	41 days
1938	45 days
1939	48 days
1940	70 days
1941	20 days
1942	48 days
1943	88 days
1944	54 days
1945	46 days
1946	37 days
1947	110 days
1948	53 days
1949	77 days
1950	94 days
1951	137 days
1952	108 days
1953	113 days
1954	48 days
1955	128 days
1956	110 days
1957	125 days
1958	73 days
1959	60 days
1960	118 days
1961	47 days
1962	102 days
1963	86 days
1964	31 days
1965	30 days
1966	59 days
1967	50 days
1968	31 days
1969	167 days
2000	33 days
2001	47 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

22 years with a frost

Across 22 years with a frost, the median last spring frost at Zacapu (Smn) falls on 11 February and the median first autumn frost on 30 November, which leaves a median of 302 days between them.

Frost dates and growing season at Zacapu (Smn)
Measure	Median, all years	Earliest period	Recent period (1925 to 2000)	Recent against earliest	Fitted trend
Last spring frost	11 February	n/a	11 February	n/a	n/a
First autumn frost	30 November	n/a	30 November	n/a	n/a
Growing days	302 days	n/a	302 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

46 years, 1923 to 2001

A day with at least 43.5 mm (1.7 in) of rain is expected about once in 2 years. A day with at least 90.1 mm (3.5 in) of rain is expected about once in 100 years.

Rainfall return levels at Zacapu (Smn): the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	43.5 mm (1.7 in)
5 years	56.1 mm (2.2 in)
10 years	64.4 mm (2.5 in)
25 years	74.8 mm (2.9 in)
50 years	82.5 mm (3.2 in)	Longer than the 46 years of record
100 years	90.1 mm (3.5 in)	Longer than the 46 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, 46 years of values from 1923 to 2001.

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: 86.6 mm (3.4 in) in 1937; 81.8 mm (3.2 in) in 1960; 68.8 mm (2.7 in) in 1954.

Download the Data

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