Tlachichuca Weather Records (MXN00021095)

Record envelope, standing records and threshold days for Tlachichuca (MXN00021095), Mexico, with 52 years of record.

Key Facts for Tlachichuca

Tlachichuca (MXN00021095) is a weather station in Mexico at 19.13 latitude and -97.42 longitude, 2,780 m (9,120 ft) above sea level.
The station reports from 1936 to 1987, 52 years of record.
1,464 records set at Tlachichuca still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Tlachichuca set a daily record high maximum temperature of 25.6 C (78.1 F) on 9 December 1986.

About the Station

Location: Mexico, 19.13 latitude, -97.42 longitude.
Elevation: 2,780 m (9,120 ft).
Period of record: 1936 to 1987, 52 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 Tlachichuca. 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 Tlachichuca, 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)	-9.4 C (15.1 F)	n/a	n/a
Feb	31.7 C (89.1 F)	-6.1 C (21.0 F)	n/a	n/a
Mar	32.8 C (91.0 F)	-4.4 C (24.1 F)	n/a	n/a
Apr	32.8 C (91.0 F)	-1.1 C (30.0 F)	n/a	n/a
May	31.7 C (89.1 F)	0.0 C (32.0 F)	n/a	n/a
Jun	35.6 C (96.1 F)	0.6 C (33.1 F)	n/a	n/a
Jul	31.7 C (89.1 F)	0.0 C (32.0 F)	n/a	n/a
Aug	31.7 C (89.1 F)	0.6 C (33.1 F)	n/a	n/a
Sep	30.6 C (87.1 F)	0.0 C (32.0 F)	n/a	n/a
Oct	35.6 C (96.1 F)	-5.0 C (23.0 F)	n/a	n/a
Nov	30.0 C (86.0 F)	-6.1 C (21.0 F)	n/a	n/a
Dec	31.7 C (89.1 F)	-6.1 C (21.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Tlachichuca still stand. 1939 holds the most, with 111.

Standing records at Tlachichuca by the year they were set
Year set	Standing records
1936	60
1937	14
1938	53
1939	111
1940	46
1941	70
1942	61
1943	27
1944	15
1945	30
1946	26
1947	20
1948	31
1949	31
1950	49
1951	32
1952	21
1953	9
1954	13
1955	28
1956	17
1957	17
1958	32
1959	17
1960	17
1961	29
1962	23
1963	16
1964	22
1965	25
1966	32
1967	19
1968	16
1969	30
1970	20
1971	23
1972	18
1973	22
1974	24
1975	68
1976	5
1980	11
1981	55
1982	55
1983	37
1984	34
1985	13
1986	20

All-Time Record Progression

4 new records

4 all-time records were set at Tlachichuca between 30 May 1972 and 11 October 1980. Each dot is a new record.

When Tlachichuca set new all-time records
Date	Kind	Detail
1972-05-30	Record daily precipitation	Record daily precipitation 84.8 mm (3.3 in)
1975-03-31	Record high maximum temperature	Record high maximum temperature 32.8 C (91.0 F)
1975-06-07	Record high minimum temperature	Record high minimum temperature 18.9 C (66.0 F)
1980-10-11	Record high maximum temperature	Record high maximum temperature 35.6 C (96.1 F)

Wettest Day of Each Month

May: 84.8 mm (3.3 in)

The wettest day on record for each calendar month at Tlachichuca. The most was 84.8 mm (3.3 in) on 30 May 1972.

Record daily precipitation for each month at Tlachichuca
Month	Record daily precipitation (mm)	Date
Jan	29.0 mm (1.1 in)	9 January 1958
Feb	23.9 mm (0.9 in)	5 February 1942
Mar	20.8 mm (0.8 in)	26 March 1939
Apr	39.9 mm (1.6 in)	5 April 1969
May	84.8 mm (3.3 in)	30 May 1972
Jun	69.9 mm (2.8 in)	11 June 1944
Jul	47.0 mm (1.9 in)	4 July 1938
Aug	73.9 mm (2.9 in)	1 August 1975
Sep	59.9 mm (2.4 in)	25 September 1949
Oct	45.0 mm (1.8 in)	2 October 1945
Nov	46.0 mm (1.8 in)	8 November 1963
Dec	37.8 mm (1.5 in)	2 December 1941

Period of Record Coverage

1936 to 1987

49 years of record at Tlachichuca, 1936 to 1987. 10 years have data for under 90 percent of days and are left out of rankings: 1936, 1952, 1953, 1976, 1980, 1983, 1984, 1985 and others.

Days with data per year at Tlachichuca
Year	Days with data	Share of year	Complete
1936	305	83%	No
1937	365	100%	Yes
1938	364	100%	Yes
1939	336	92%	Yes
1940	365	100%	Yes
1941	364	100%	Yes
1942	365	100%	Yes
1943	365	100%	Yes
1944	335	92%	Yes
1945	365	100%	Yes
1946	365	100%	Yes
1947	365	100%	Yes
1948	366	100%	Yes
1949	365	100%	Yes
1950	337	92%	Yes
1951	365	100%	Yes
1952	304	83%	No
1953	153	42%	No
1954	365	100%	Yes
1955	364	100%	Yes
1956	366	100%	Yes
1957	365	100%	Yes
1958	365	100%	Yes
1959	365	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	336	92%	Yes
1969	355	97%	Yes
1970	359	98%	Yes
1971	364	100%	Yes
1972	366	100%	Yes
1973	364	100%	Yes
1974	364	100%	Yes
1975	334	92%	Yes
1976	203	55%	No
1980	30	8%	No
1981	353	97%	Yes
1982	344	94%	Yes
1983	236	65%	No
1984	176	48%	No
1985	201	55%	No
1986	177	48%	No
1987	54	15%	No

Latest Records

Latest records at Tlachichuca
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
9 December 1986	Tlachichuca, MX	daily high max	25.6 C (78.1 F)	0.6 C (1.1 F)	44 years	19 of 100 (Routine)
23 November 1986	Tlachichuca, MX	daily high max (Tie)	25.6 C (78.1 F)	tie	20 years	2 of 100 (Routine)
1 November 1986	Tlachichuca, MX	daily high max	28.9 C (84.0 F)	3.3 C (5.9 F)	43 years	28 of 100 (Routine)
29 August 1986	Tlachichuca, MX	daily low min (Tie)	5.0 C (41.0 F)	tie	39 years	4 of 100 (Routine)
25 August 1986	Tlachichuca, MX	daily low min	2.8 C (37.0 F)	1.1 C (2.0 F)	3 years	10 of 100 (Routine)
23 August 1986	Tlachichuca, MX	daily low min	1.7 C (35.1 F)	1.1 C (2.0 F)	12 years	13 of 100 (Routine)
22 August 1986	Tlachichuca, MX	daily low min (Tie)	2.8 C (37.0 F)	tie	4 years	1 of 100 (Routine)
14 August 1986	Tlachichuca, MX	daily low min (Tie)	2.8 C (37.0 F)	tie	44 years	4 of 100 (Routine)
12 August 1986	Tlachichuca, MX	daily low min (Tie)	2.8 C (37.0 F)	tie	0 years	1 of 100 (Routine)
28 June 1986	Tlachichuca, MX	daily low min (Tie)	2.8 C (37.0 F)	tie	15 years	2 of 100 (Routine)
27 June 1986	Tlachichuca, MX	daily low min	1.7 C (35.1 F)	2.2 C (4.0 F)	48 years	28 of 100 (Routine)
26 June 1986	Tlachichuca, MX	daily low min	3.9 C (39.0 F)	0.5 C (0.9 F)	48 years	21 of 100 (Routine)
24 June 1986	Tlachichuca, MX	daily low min (Tie)	5.0 C (41.0 F)	tie	48 years	4 of 100 (Routine)
22 June 1986	Tlachichuca, MX	daily low min	2.8 C (37.0 F)	0.5 C (0.9 F)	36 years	18 of 100 (Routine)
17 June 1986	Tlachichuca, MX	daily low min	1.7 C (35.1 F)	1.1 C (2.0 F)	4 years	10 of 100 (Routine)
16 June 1986	Tlachichuca, MX	daily low min	1.7 C (35.1 F)	1.1 C (2.0 F)	4 years	10 of 100 (Routine)
15 June 1986	Tlachichuca, MX	daily low min (Tie)	3.9 C (39.0 F)	tie	1 year	1 of 100 (Routine)
12 June 1986	Tlachichuca, MX	daily low min	1.7 C (35.1 F)	1.1 C (2.0 F)	4 years	10 of 100 (Routine)
9 June 1986	Tlachichuca, MX	daily low min	1.7 C (35.1 F)	2.7 C (4.9 F)	49 years	30 of 100 (Routine)
8 June 1986	Tlachichuca, MX	daily low min	1.7 C (35.1 F)	1.6 C (2.9 F)	43 years	24 of 100 (Routine)

Climate Trend

33 complete years, 1937 to 1981

One stripe for each of 33 complete years at Tlachichuca, 1937 to 1981. Blue stripes are years cooler than the station's own mean of 13.8 C (56.8 F); red stripes are warmer. The coolest year was 1938, at 12.1 C (53.7 F), and the warmest was 1969, at 14.8 C (58.7 F). The strongest colour marks a difference of 1.8 C (3.2 F).

Annual mean temperature at Tlachichuca as warming stripes, 1937 to 1981
Year	Annual mean temperature	Difference from the station mean
1937	12.2 C	-1.54 C
1938	12.1 C	-1.72 C
1940	13.1 C	-0.71 C
1941	13.6 C	-0.13 C
1942	14.3 C	+0.49 C
1943	13.2 C	-0.62 C
1945	14.4 C	+0.60 C
1946	13.8 C	+0.06 C
1947	13.8 C	-0.01 C
1948	13.5 C	-0.25 C
1949	13.4 C	-0.37 C
1951	13.7 C	-0.06 C
1954	13.5 C	-0.23 C
1955	13.7 C	-0.09 C
1956	13.4 C	-0.41 C
1957	13.8 C	-0.01 C
1958	13.7 C	-0.10 C
1959	13.6 C	-0.13 C
1960	14.3 C	+0.57 C
1961	14.2 C	+0.45 C
1962	14.5 C	+0.75 C
1963	14.0 C	+0.24 C
1964	14.4 C	+0.59 C
1965	13.9 C	+0.13 C
1966	13.8 C	0.00 C
1967	13.8 C	+0.05 C
1969	14.8 C	+1.04 C
1970	14.2 C	+0.44 C
1971	13.9 C	+0.12 C
1972	13.8 C	+0.03 C
1973	14.3 C	+0.57 C
1974	13.8 C	+0.06 C
1981	14.1 C	+0.30 C

The annual mean temperature here has risen by 0.3 C (0.1 to 0.4) per decade over 1937 to 1981. In Fahrenheit: 0.5 F (0.3 to 0.8) per decade. The slope is a straight line fitted to 33 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Tlachichuca
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.3 C (0.1 to 0.4) per decade	0.5 F (0.3 to 0.8) per decade	1937 to 1981	33	Rise
Mean daily maximum	0.26 C (0.00 to 0.52) per decade	0.46 F (0.00 to 0.93) per decade	1937 to 1981	33	Not clearly different from zero
Mean daily minimum	0.3 C (0.1 to 0.5) per decade	0.6 F (0.2 to 0.9) per decade	1937 to 1981	33	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

1936 to 1987

Yearly extremes at Tlachichuca: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	35.6 C (96.1 F)	1980	28.9 C (84.0 F)	49
Coldest night (TNn)	-9.4 C (15.1 F)	1938	-1.7 C (28.9 F)	49
Wettest day (Rx1day)	84.8 mm (3.3 in)	1972	39.9 mm (1.6 in)	49
Wettest five days (Rx5day)	134.7 mm (5.3 in)	1972	77.8 mm (3.1 in)	49
Longest dry spell (CDD)	214 days	1982	61 days	49

Hottest day (TXx)

The hottest day of the year at Tlachichuca, 1936 to 1987. The record is 35.6 C (96.1 F) in 1980, marked on the chart; the median year is 28.9 C (84.0 F).

Hottest day (TXx) at Tlachichuca by year
Year	Hottest day (TXx)
1936	25.0 C (77.0 F)
1937	23.3 C (73.9 F)
1938	27.8 C (82.0 F)
1939	24.4 C (75.9 F)
1940	27.8 C (82.0 F)
1941	29.4 C (84.9 F)
1942	31.7 C (89.1 F)
1943	31.7 C (89.1 F)
1944	28.9 C (84.0 F)
1945	30.0 C (86.0 F)
1946	29.4 C (84.9 F)
1947	27.8 C (82.0 F)
1948	29.4 C (84.9 F)
1949	27.8 C (82.0 F)
1950	26.1 C (79.0 F)
1951	27.2 C (81.0 F)
1952	25.6 C (78.1 F)
1953	25.6 C (78.1 F)
1954	28.3 C (82.9 F)
1955	28.3 C (82.9 F)
1956	27.8 C (82.0 F)
1957	29.4 C (84.9 F)
1958	28.3 C (82.9 F)
1959	26.7 C (80.1 F)
1960	27.8 C (82.0 F)
1961	29.4 C (84.9 F)
1962	28.3 C (82.9 F)
1963	28.3 C (82.9 F)
1964	30.6 C (87.1 F)
1965	28.9 C (84.0 F)
1966	29.4 C (84.9 F)
1967	30.6 C (87.1 F)
1968	26.7 C (80.1 F)
1969	28.9 C (84.0 F)
1970	28.9 C (84.0 F)
1971	28.9 C (84.0 F)
1972	28.9 C (84.0 F)
1973	28.9 C (84.0 F)
1974	28.9 C (84.0 F)
1975	32.8 C (91.0 F)
1976	28.9 C (84.0 F)
1980	35.6 C (96.1 F)
1981	31.7 C (89.1 F)
1982	31.7 C (89.1 F)
1983	31.7 C (89.1 F)
1984	35.6 C (96.1 F)
1985	27.8 C (82.0 F)
1986	28.9 C (84.0 F)
1987	30.0 C (86.0 F)

Coldest night (TNn)

The coldest night of the year at Tlachichuca, 1936 to 1987. The record is -9.4 C (15.1 F) in 1938, marked on the chart; the median year is -1.7 C (28.9 F).

Coldest night (TNn) at Tlachichuca by year
Year	Coldest night (TNn)
1936	1.1 C (34.0 F)
1937	-1.7 C (28.9 F)
1938	-9.4 C (15.1 F)
1939	-4.4 C (24.1 F)
1940	-5.0 C (23.0 F)
1941	-3.9 C (25.0 F)
1942	-6.7 C (19.9 F)
1943	-5.6 C (21.9 F)
1944	-3.3 C (26.1 F)
1945	0.6 C (33.1 F)
1946	-5.6 C (21.9 F)
1947	0.0 C (32.0 F)
1948	-2.2 C (28.0 F)
1949	-5.0 C (23.0 F)
1950	-6.1 C (21.0 F)
1951	-6.1 C (21.0 F)
1952	-6.1 C (21.0 F)
1953	0.0 C (32.0 F)
1954	-1.1 C (30.0 F)
1955	-3.3 C (26.1 F)
1956	-5.0 C (23.0 F)
1957	-3.3 C (26.1 F)
1958	-2.2 C (28.0 F)
1959	-5.0 C (23.0 F)
1960	-0.6 C (30.9 F)
1961	-3.3 C (26.1 F)
1962	-3.3 C (26.1 F)
1963	-2.2 C (28.0 F)
1964	-2.2 C (28.0 F)
1965	-5.0 C (23.0 F)
1966	0.0 C (32.0 F)
1967	0.0 C (32.0 F)
1968	-0.6 C (30.9 F)
1969	0.0 C (32.0 F)
1970	-1.1 C (30.0 F)
1971	0.6 C (33.1 F)
1972	-0.6 C (30.9 F)
1973	0.0 C (32.0 F)
1974	-1.1 C (30.0 F)
1975	-2.2 C (28.0 F)
1976	-0.6 C (30.9 F)
1980	0.0 C (32.0 F)
1981	1.7 C (35.1 F)
1982	1.7 C (35.1 F)
1983	0.0 C (32.0 F)
1984	0.0 C (32.0 F)
1985	0.6 C (33.1 F)
1986	1.7 C (35.1 F)
1987	1.7 C (35.1 F)

Wettest day (Rx1day)

The wettest day of the year at Tlachichuca, 1936 to 1987. The record is 84.8 mm (3.3 in) in 1972, marked on the chart; the median year is 39.9 mm (1.6 in).

Wettest day (Rx1day) at Tlachichuca by year
Year	Wettest day (Rx1day)
1936	58.9 mm (2.3 in)
1937	47.0 mm (1.9 in)
1938	47.0 mm (1.9 in)
1939	45.0 mm (1.8 in)
1940	37.8 mm (1.5 in)
1941	46.0 mm (1.8 in)
1942	33.8 mm (1.3 in)
1943	53.8 mm (2.1 in)
1944	69.9 mm (2.8 in)
1945	45.0 mm (1.8 in)
1946	48.8 mm (1.9 in)
1947	45.0 mm (1.8 in)
1948	31.8 mm (1.3 in)
1949	59.9 mm (2.4 in)
1950	30.0 mm (1.2 in)
1951	45.0 mm (1.8 in)
1952	30.5 mm (1.2 in)
1953	31.8 mm (1.3 in)
1954	35.8 mm (1.4 in)
1955	34.8 mm (1.4 in)
1956	20.8 mm (0.8 in)
1957	21.8 mm (0.9 in)
1958	39.9 mm (1.6 in)
1959	36.8 mm (1.4 in)
1960	39.9 mm (1.6 in)
1961	36.8 mm (1.4 in)
1962	23.9 mm (0.9 in)
1963	46.0 mm (1.8 in)
1964	49.8 mm (2.0 in)
1965	30.0 mm (1.2 in)
1966	34.8 mm (1.4 in)
1967	41.9 mm (1.6 in)
1968	45.0 mm (1.8 in)
1969	47.0 mm (1.9 in)
1970	39.9 mm (1.6 in)
1971	54.9 mm (2.2 in)
1972	84.8 mm (3.3 in)
1973	30.0 mm (1.2 in)
1974	42.9 mm (1.7 in)
1975	73.9 mm (2.9 in)
1976	45.0 mm (1.8 in)
1980	6.9 mm (0.27 in)
1981	22.9 mm (0.9 in)
1982	0.0 mm (0.00 in)
1983	0.0 mm (0.00 in)
1984	0.0 mm (0.00 in)
1985	0.0 mm (0.00 in)
1986	0.0 mm (0.00 in)
1987	0.0 mm (0.00 in)

Wettest five days (Rx5day)

The wettest five days of the year at Tlachichuca, 1936 to 1987. The record is 134.7 mm (5.3 in) in 1972, marked on the chart; the median year is 77.8 mm (3.1 in).

Wettest five days (Rx5day) at Tlachichuca by year
Year	Wettest five days (Rx5day)
1936	109.5 mm (4.3 in)
1937	101.4 mm (4.0 in)
1938	69.4 mm (2.7 in)
1939	90.4 mm (3.6 in)
1940	66.5 mm (2.6 in)
1941	86.6 mm (3.4 in)
1942	80.7 mm (3.2 in)
1943	88.7 mm (3.5 in)
1944	81.1 mm (3.2 in)
1945	81.1 mm (3.2 in)
1946	77.8 mm (3.1 in)
1947	87.2 mm (3.4 in)
1948	61.8 mm (2.4 in)
1949	94.9 mm (3.7 in)
1950	44.5 mm (1.8 in)
1951	83.4 mm (3.3 in)
1952	57.2 mm (2.3 in)
1953	53.4 mm (2.1 in)
1954	98.3 mm (3.9 in)
1955	94.0 mm (3.7 in)
1956	60.5 mm (2.4 in)
1957	50.0 mm (2.0 in)
1958	100.7 mm (4.0 in)
1959	70.6 mm (2.8 in)
1960	74.9 mm (2.9 in)
1961	81.5 mm (3.2 in)
1962	31.8 mm (1.3 in)
1963	59.7 mm (2.4 in)
1964	63.8 mm (2.5 in)
1965	74.6 mm (2.9 in)
1966	82.6 mm (3.3 in)
1967	89.5 mm (3.5 in)
1968	116.2 mm (4.6 in)
1969	91.5 mm (3.6 in)
1970	90.2 mm (3.6 in)
1971	119.2 mm (4.7 in)
1972	134.7 mm (5.3 in)
1973	59.5 mm (2.3 in)
1974	73.4 mm (2.9 in)
1975	113.8 mm (4.5 in)
1976	63.2 mm (2.5 in)
1980	11.7 mm (0.5 in)
1981	86.3 mm (3.4 in)
1982	0.0 mm (0.00 in)
1983	0.0 mm (0.00 in)
1984	0.0 mm (0.00 in)
1985	0.0 mm (0.00 in)
1986	0.0 mm (0.00 in)
1987	0.0 mm (0.00 in)

Longest dry spell (CDD)

The longest dry spell of the year at Tlachichuca, 1936 to 1987. The record is 214 days in 1982, marked on the chart; the median year is 61 days.

Longest dry spell (CDD) at Tlachichuca by year
Year	Longest dry spell (CDD)
1936	60 days
1937	68 days
1938	50 days
1939	66 days
1940	43 days
1941	40 days
1942	43 days
1943	77 days
1944	69 days
1945	100 days
1946	52 days
1947	40 days
1948	71 days
1949	83 days
1950	70 days
1951	76 days
1952	46 days
1953	54 days
1954	40 days
1955	72 days
1956	68 days
1957	47 days
1958	52 days
1959	60 days
1960	71 days
1961	33 days
1962	58 days
1963	63 days
1964	31 days
1965	61 days
1966	51 days
1967	64 days
1968	56 days
1969	62 days
1970	61 days
1971	74 days
1972	35 days
1973	57 days
1974	64 days
1975	64 days
1976	28 days
1980	14 days
1981	181 days
1982	214 days
1983	184 days
1984	61 days
1985	89 days
1986	61 days
1987	31 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

23 years with a frost

Across 23 years with a frost, the median last spring frost at Tlachichuca falls on 12 February and the median first autumn frost on 30 November, which leaves a median of 291 days between them.

Frost dates and growing season at Tlachichuca
Measure	Median, all years	Earliest period	Recent period (1937 to 1973)	Recent against earliest	Fitted trend
Last spring frost	12 February	n/a	12 February	n/a	n/a
First autumn frost	30 November	n/a	30 November	n/a	n/a
Growing days	291 days	n/a	291 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

38 years, 1937 to 1982

A day with at least 41.2 mm (1.6 in) of rain is expected about once in 2 years. A day with at least 77.2 mm (3.0 in) of rain is expected about once in 100 years.

Rainfall return levels at Tlachichuca: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	41.2 mm (1.6 in)
5 years	53.8 mm (2.1 in)
10 years	60.8 mm (2.4 in)
25 years	68.3 mm (2.7 in)
50 years	73.0 mm (2.9 in)	Longer than the 38 years of record
100 years	77.2 mm (3.0 in)	Longer than the 38 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, 38 years of values from 1937 to 1982.

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: 84.8 mm (3.3 in) in 1972; 73.9 mm (2.9 in) in 1975; 69.9 mm (2.8 in) in 1944.

Download the Data

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