Tlacotepec Weather Records (MXN00017020)

Record envelope, standing records and threshold days for Tlacotepec (MXN00017020), Mexico, with 58 years of record.

Key Facts for Tlacotepec

Tlacotepec (MXN00017020) is a weather station in Mexico at 18.80 latitude and -98.75 longitude, 1,754 m (5,754 ft) above sea level.
The station reports from 1955 to 2012, 58 years of record.
1,464 records set at Tlacotepec still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Tlacotepec set a monthly record high maximum temperature of 34.4 C (93.9 F) on 30 November 2012.

About the Station

Location: Mexico, 18.80 latitude, -98.75 longitude.
Elevation: 1,754 m (5,754 ft).
Period of record: 1955 to 2012, 58 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 Tlacotepec. 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 Tlacotepec, 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)	0.6 C (33.1 F)	n/a	n/a
Feb	35.0 C (95.0 F)	0.0 C (32.0 F)	n/a	n/a
Mar	36.7 C (98.1 F)	5.0 C (41.0 F)	n/a	n/a
Apr	37.8 C (100.0 F)	6.1 C (43.0 F)	n/a	n/a
May	38.9 C (102.0 F)	8.3 C (46.9 F)	n/a	n/a
Jun	37.8 C (100.0 F)	9.4 C (48.9 F)	n/a	n/a
Jul	35.0 C (95.0 F)	8.9 C (48.0 F)	n/a	n/a
Aug	32.8 C (91.0 F)	8.9 C (48.0 F)	n/a	n/a
Sep	31.1 C (88.0 F)	6.1 C (43.0 F)	n/a	n/a
Oct	32.8 C (91.0 F)	5.0 C (41.0 F)	n/a	n/a
Nov	34.4 C (93.9 F)	2.8 C (37.0 F)	n/a	n/a
Dec	31.7 C (89.1 F)	1.7 C (35.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Tlacotepec still stand. 1955 holds the most, with 97.

Standing records at Tlacotepec by the year they were set
Year set	Standing records
1955	97
1956	72
1957	22
1958	29
1959	5
1960	13
1961	26
1962	13
1963	8
1964	13
1965	14
1966	22
1967	19
1968	22
1969	23
1970	14
1971	17
1972	16
1973	20
1974	12
1975	26
1976	42
1977	22
1978	28
1979	22
1980	19
1981	15
1982	19
1983	22
1984	12
1985	10
1986	23
1987	22
1988	29
1989	58
1990	40
1991	24
1992	28
1993	14
1994	15
1995	37
1996	29
1997	58
1998	81
1999	32
2000	19
2001	40
2002	13
2003	31
2004	7
2005	20
2006	8
2007	5
2008	6
2009	18
2010	15
2011	8
2012	70

All-Time Record Progression

5 new records

5 all-time records were set at Tlacotepec between 1 May 1995 and 30 June 2011. Each dot is a new record.

When Tlacotepec set new all-time records
Date	Kind	Detail
1995-05-01	Record high minimum temperature	Record high minimum temperature 20.0 C (68.0 F)
1998-05-07	Record high maximum temperature	Record high maximum temperature 38.9 C (102.0 F)
2003-09-27	Record daily precipitation	Record daily precipitation 94.5 mm (3.7 in)
2005-06-29	Record daily precipitation	Record daily precipitation 98.3 mm (3.9 in)
2011-06-30	Record daily precipitation	Record daily precipitation 108.2 mm (4.3 in)

Wettest Day of Each Month

Jun: 108.2 mm (4.3 in)

The wettest day on record for each calendar month at Tlacotepec. The most was 108.2 mm (4.3 in) on 30 June 2011.

Record daily precipitation for each month at Tlacotepec
Month	Record daily precipitation (mm)	Date
Jan	40.6 mm (1.6 in)	10 January 1967
Feb	49.8 mm (2.0 in)	4 February 2010
Mar	20.6 mm (0.8 in)	2 March 2001
Apr	42.4 mm (1.7 in)	15 April 2011
May	73.9 mm (2.9 in)	16 May 1999
Jun	108.2 mm (4.3 in)	30 June 2011
Jul	80.3 mm (3.2 in)	2 July 2001
Aug	82.3 mm (3.2 in)	10 August 1988
Sep	94.5 mm (3.7 in)	27 September 2003
Oct	67.1 mm (2.6 in)	4 October 1995
Nov	69.3 mm (2.7 in)	10 November 1958
Dec	29.7 mm (1.2 in)	3 December 1968

Period of Record Coverage

1955 to 2012

58 years of record at Tlacotepec, 1955 to 2012. 7 years have data for under 90 percent of days and are left out of rankings: 1955, 1959, 1960, 1964, 1974, 1985, 1986.

Days with data per year at Tlacotepec
Year	Days with data	Share of year	Complete
1955	274	75%	No
1956	366	100%	Yes
1957	365	100%	Yes
1958	333	91%	Yes
1959	88	24%	No
1960	225	61%	No
1961	365	100%	Yes
1962	334	92%	Yes
1963	335	92%	Yes
1964	306	84%	No
1965	365	100%	Yes
1966	333	91%	Yes
1967	330	90%	Yes
1968	366	100%	Yes
1969	332	91%	Yes
1970	364	100%	Yes
1971	335	92%	Yes
1972	365	100%	Yes
1973	334	92%	Yes
1974	212	58%	No
1975	361	99%	Yes
1976	365	100%	Yes
1977	363	99%	Yes
1978	365	100%	Yes
1979	365	100%	Yes
1980	366	100%	Yes
1981	365	100%	Yes
1982	335	92%	Yes
1983	364	100%	Yes
1984	365	100%	Yes
1985	273	75%	No
1986	306	84%	No
1987	365	100%	Yes
1988	366	100%	Yes
1989	365	100%	Yes
1990	365	100%	Yes
1991	365	100%	Yes
1992	366	100%	Yes
1993	365	100%	Yes
1994	365	100%	Yes
1995	365	100%	Yes
1996	366	100%	Yes
1997	364	100%	Yes
1998	365	100%	Yes
1999	365	100%	Yes
2000	366	100%	Yes
2001	365	100%	Yes
2002	365	100%	Yes
2003	365	100%	Yes
2004	366	100%	Yes
2005	365	100%	Yes
2006	365	100%	Yes
2007	365	100%	Yes
2008	366	100%	Yes
2009	365	100%	Yes
2010	365	100%	Yes
2011	365	100%	Yes
2012	335	92%	Yes

Latest Records

Latest records at Tlacotepec
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
30 November 2012	Tlacotepec, MX	monthly high max	34.4 C (93.9 F)	0.5 C (0.9 F)	0 years	17 of 100 (Routine)
29 November 2012	Tlacotepec, MX	daily high max (Tie)	31.7 C (89.1 F)	tie	18 years	2 of 100 (Routine)
28 November 2012	Tlacotepec, MX	daily high max	31.1 C (88.0 F)	1.1 C (2.0 F)	18 years	15 of 100 (Routine)
26 November 2012	Tlacotepec, MX	daily high max	31.7 C (89.1 F)	1.7 C (3.1 F)	45 years	26 of 100 (Routine)
24 November 2012	Tlacotepec, MX	daily high max	32.2 C (90.0 F)	2.2 C (4.0 F)	19 years	21 of 100 (Routine)
23 November 2012	Tlacotepec, MX	monthly high max (Tie)	33.9 C (93.0 F)	tie	0 years	3 of 100 (Routine)
21 November 2012	Tlacotepec, MX	daily high max	31.1 C (88.0 F)	1.1 C (2.0 F)	15 years	14 of 100 (Routine)
18 November 2012	Tlacotepec, MX	daily high max	31.7 C (89.1 F)	1.7 C (3.1 F)	26 years	20 of 100 (Routine)
17 November 2012	Tlacotepec, MX	daily high max	32.8 C (91.0 F)	1.7 C (3.1 F)	26 years	20 of 100 (Routine)
16 November 2012	Tlacotepec, MX	daily high max	32.8 C (91.0 F)	3.9 C (7.0 F)	26 years	31 of 100 (Routine)
15 November 2012	Tlacotepec, MX	daily high max	32.2 C (90.0 F)	2.2 C (4.0 F)	18 years	21 of 100 (Routine)
14 November 2012	Tlacotepec, MX	daily high max	31.7 C (89.1 F)	1.7 C (3.1 F)	7 years	15 of 100 (Routine)
13 November 2012	Tlacotepec, MX	daily high max (Tie)	30.0 C (86.0 F)	tie	12 years	2 of 100 (Routine)
12 November 2012	Tlacotepec, MX	monthly high max	33.9 C (93.0 F)	1.1 C (2.0 F)	0 years	20 of 100 (Routine)
11 November 2012	Tlacotepec, MX	daily high max	30.6 C (87.1 F)	0.6 C (1.1 F)	17 years	13 of 100 (Routine)
10 November 2012	Tlacotepec, MX	daily high max	32.2 C (90.0 F)	1.6 C (2.9 F)	17 years	18 of 100 (Routine)
9 November 2012	Tlacotepec, MX	daily high max	31.7 C (89.1 F)	1.1 C (2.0 F)	17 years	15 of 100 (Routine)
8 November 2012	Tlacotepec, MX	daily high max	31.7 C (89.1 F)	1.1 C (2.0 F)	37 years	21 of 100 (Routine)
7 November 2012	Tlacotepec, MX	daily high max (Tie)	31.7 C (89.1 F)	tie	17 years	2 of 100 (Routine)
6 November 2012	Tlacotepec, MX	daily high max (Tie)	31.7 C (89.1 F)	tie	18 years	2 of 100 (Routine)

Climate Trend

41 complete years, 1956 to 2011

One stripe for each of 41 complete years at Tlacotepec, 1956 to 2011. Blue stripes are years cooler than the station's own mean of 19.9 C (67.8 F); red stripes are warmer. The coolest year was 1956, at 18.7 C (65.6 F), and the warmest was 1997, at 21.0 C (69.8 F). The strongest colour marks a difference of 1.2 C (2.2 F).

Annual mean temperature at Tlacotepec as warming stripes, 1956 to 2011
Year	Annual mean temperature	Difference from the station mean
1956	18.7 C	-1.19 C
1957	19.9 C	+0.03 C
1961	19.0 C	-0.85 C
1965	19.1 C	-0.81 C
1968	19.3 C	-0.58 C
1970	19.6 C	-0.25 C
1972	19.9 C	+0.01 C
1975	19.2 C	-0.70 C
1976	19.3 C	-0.56 C
1977	19.3 C	-0.63 C
1978	19.0 C	-0.91 C
1979	19.2 C	-0.66 C
1980	19.3 C	-0.57 C
1981	19.0 C	-0.84 C
1983	19.4 C	-0.45 C
1984	19.3 C	-0.57 C
1987	20.1 C	+0.18 C
1988	19.6 C	-0.27 C
1989	19.3 C	-0.56 C
1990	19.2 C	-0.71 C
1991	20.1 C	+0.23 C
1992	19.2 C	-0.66 C
1993	20.2 C	+0.31 C
1994	20.7 C	+0.83 C
1995	20.8 C	+0.94 C
1996	20.8 C	+0.92 C
1997	21.0 C	+1.11 C
1998	20.8 C	+0.96 C
1999	19.7 C	-0.21 C
2000	20.3 C	+0.37 C
2001	20.4 C	+0.51 C
2002	20.5 C	+0.63 C
2003	20.8 C	+0.89 C
2004	20.2 C	+0.32 C
2005	20.9 C	+1.03 C
2006	20.3 C	+0.43 C
2007	20.3 C	+0.44 C
2008	20.3 C	+0.37 C
2009	20.7 C	+0.79 C
2010	20.0 C	+0.16 C
2011	20.6 C	+0.71 C

The annual mean temperature here has risen by 0.3 C (0.2 to 0.4) per decade over 1956 to 2011. In Fahrenheit: 0.6 F (0.4 to 0.7) per decade. The slope is a straight line fitted to 41 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Tlacotepec
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.3 C (0.2 to 0.4) per decade	0.6 F (0.4 to 0.7) per decade	1956 to 2011	41	Rise
Mean daily maximum	0.5 C (0.4 to 0.7) per decade	1.0 F (0.7 to 1.2) per decade	1956 to 2011	41	Rise
Mean daily minimum	0.11 C (0.01 to 0.21) per decade	0.20 F (0.02 to 0.37) per decade	1956 to 2011	41	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

1955 to 2012

Yearly extremes at Tlacotepec: 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)	1998	35.0 C (95.0 F)	58
Coldest night (TNn)	0.0 C (32.0 F)	1974	3.9 C (39.0 F)	58
Wettest day (Rx1day)	108.2 mm (4.3 in)	2011	58.6 mm (2.3 in)	58
Wettest five days (Rx5day)	195.3 mm (7.7 in)	1968	126.8 mm (5.0 in)	58
Longest dry spell (CDD)	147 days	1998	64 days	58

Hottest day (TXx)

The hottest day of the year at Tlacotepec, 1955 to 2012. The record is 38.9 C (102.0 F) in 1998, marked on the chart; the median year is 35.0 C (95.0 F).

Hottest day (TXx) at Tlacotepec by year
Year	Hottest day (TXx)
1955	32.2 C (90.0 F)
1956	30.6 C (87.1 F)
1957	32.8 C (91.0 F)
1958	32.8 C (91.0 F)
1959	31.7 C (89.1 F)
1960	32.8 C (91.0 F)
1961	32.8 C (91.0 F)
1962	31.7 C (89.1 F)
1963	31.7 C (89.1 F)
1964	35.0 C (95.0 F)
1965	32.2 C (90.0 F)
1966	32.8 C (91.0 F)
1967	35.0 C (95.0 F)
1968	33.3 C (91.9 F)
1969	32.8 C (91.0 F)
1970	35.0 C (95.0 F)
1971	35.6 C (96.1 F)
1972	33.9 C (93.0 F)
1973	35.0 C (95.0 F)
1974	37.8 C (100.0 F)
1975	35.0 C (95.0 F)
1976	35.6 C (96.1 F)
1977	33.9 C (93.0 F)
1978	33.9 C (93.0 F)
1979	32.2 C (90.0 F)
1980	33.3 C (91.9 F)
1981	34.4 C (93.9 F)
1982	34.4 C (93.9 F)
1983	33.9 C (93.0 F)
1984	35.0 C (95.0 F)
1985	32.2 C (90.0 F)
1986	32.8 C (91.0 F)
1987	35.0 C (95.0 F)
1988	37.2 C (99.0 F)
1989	35.6 C (96.1 F)
1990	34.4 C (93.9 F)
1991	36.7 C (98.1 F)
1992	33.9 C (93.0 F)
1993	35.6 C (96.1 F)
1994	35.0 C (95.0 F)
1995	35.6 C (96.1 F)
1996	35.0 C (95.0 F)
1997	36.7 C (98.1 F)
1998	38.9 C (102.0 F)
1999	36.7 C (98.1 F)
2000	37.8 C (100.0 F)
2001	35.6 C (96.1 F)
2002	36.7 C (98.1 F)
2003	37.2 C (99.0 F)
2004	35.0 C (95.0 F)
2005	36.7 C (98.1 F)
2006	35.6 C (96.1 F)
2007	35.0 C (95.0 F)
2008	35.6 C (96.1 F)
2009	37.8 C (100.0 F)
2010	36.1 C (97.0 F)
2011	35.0 C (95.0 F)
2012	35.6 C (96.1 F)

Coldest night (TNn)

The coldest night of the year at Tlacotepec, 1955 to 2012. The record is 0.0 C (32.0 F) in 1974, marked on the chart; the median year is 3.9 C (39.0 F).

Coldest night (TNn) at Tlacotepec by year
Year	Coldest night (TNn)
1955	7.8 C (46.0 F)
1956	3.9 C (39.0 F)
1957	5.0 C (41.0 F)
1958	5.6 C (42.1 F)
1959	6.7 C (44.1 F)
1960	3.9 C (39.0 F)
1961	3.9 C (39.0 F)
1962	2.8 C (37.0 F)
1963	3.9 C (39.0 F)
1964	6.7 C (44.1 F)
1965	2.8 C (37.0 F)
1966	2.8 C (37.0 F)
1967	3.9 C (39.0 F)
1968	2.8 C (37.0 F)
1969	5.0 C (41.0 F)
1970	5.0 C (41.0 F)
1971	3.3 C (37.9 F)
1972	2.8 C (37.0 F)
1973	3.9 C (39.0 F)
1974	0.0 C (32.0 F)
1975	3.9 C (39.0 F)
1976	2.8 C (37.0 F)
1977	1.7 C (35.1 F)
1978	5.0 C (41.0 F)
1979	1.1 C (34.0 F)
1980	3.3 C (37.9 F)
1981	2.8 C (37.0 F)
1982	5.0 C (41.0 F)
1983	5.0 C (41.0 F)
1984	5.0 C (41.0 F)
1985	6.7 C (44.1 F)
1986	6.7 C (44.1 F)
1987	3.3 C (37.9 F)
1988	0.6 C (33.1 F)
1989	1.7 C (35.1 F)
1990	3.9 C (39.0 F)
1991	5.0 C (41.0 F)
1992	2.8 C (37.0 F)
1993	5.6 C (42.1 F)
1994	5.0 C (41.0 F)
1995	5.0 C (41.0 F)
1996	5.0 C (41.0 F)
1997	5.0 C (41.0 F)
1998	3.9 C (39.0 F)
1999	3.9 C (39.0 F)
2000	5.0 C (41.0 F)
2001	5.0 C (41.0 F)
2002	2.8 C (37.0 F)
2003	5.0 C (41.0 F)
2004	5.0 C (41.0 F)
2005	3.9 C (39.0 F)
2006	3.9 C (39.0 F)
2007	5.6 C (42.1 F)
2008	3.3 C (37.9 F)
2009	5.0 C (41.0 F)
2010	5.0 C (41.0 F)
2011	6.7 C (44.1 F)
2012	5.6 C (42.1 F)

Wettest day (Rx1day)

The wettest day of the year at Tlacotepec, 1955 to 2012. The record is 108.2 mm (4.3 in) in 2011, marked on the chart; the median year is 58.6 mm (2.3 in).

Wettest day (Rx1day) at Tlacotepec by year
Year	Wettest day (Rx1day)
1955	69.1 mm (2.7 in)
1956	67.1 mm (2.6 in)
1957	54.4 mm (2.1 in)
1958	69.3 mm (2.7 in)
1959	12.4 mm (0.5 in)
1960	58.4 mm (2.3 in)
1961	42.7 mm (1.7 in)
1962	80.0 mm (3.1 in)
1963	67.1 mm (2.6 in)
1964	69.1 mm (2.7 in)
1965	68.1 mm (2.7 in)
1966	70.6 mm (2.8 in)
1967	71.1 mm (2.8 in)
1968	56.6 mm (2.2 in)
1969	62.5 mm (2.5 in)
1970	56.4 mm (2.2 in)
1971	44.2 mm (1.7 in)
1972	47.5 mm (1.9 in)
1973	78.7 mm (3.1 in)
1974	82.3 mm (3.2 in)
1975	82.6 mm (3.3 in)
1976	59.9 mm (2.4 in)
1977	53.8 mm (2.1 in)
1978	74.4 mm (2.9 in)
1979	39.9 mm (1.6 in)
1980	51.8 mm (2.0 in)
1981	65.8 mm (2.6 in)
1982	48.8 mm (1.9 in)
1983	48.8 mm (1.9 in)
1984	40.9 mm (1.6 in)
1985	47.0 mm (1.9 in)
1986	50.3 mm (2.0 in)
1987	73.4 mm (2.9 in)
1988	82.3 mm (3.2 in)
1989	45.0 mm (1.8 in)
1990	49.5 mm (1.9 in)
1991	61.7 mm (2.4 in)
1992	46.5 mm (1.8 in)
1993	47.5 mm (1.9 in)
1994	57.9 mm (2.3 in)
1995	67.1 mm (2.6 in)
1996	62.0 mm (2.4 in)
1997	68.6 mm (2.7 in)
1998	56.1 mm (2.2 in)
1999	73.9 mm (2.9 in)
2000	48.8 mm (1.9 in)
2001	80.3 mm (3.2 in)
2002	53.6 mm (2.1 in)
2003	94.5 mm (3.7 in)
2004	56.6 mm (2.2 in)
2005	98.3 mm (3.9 in)
2006	54.1 mm (2.1 in)
2007	51.6 mm (2.0 in)
2008	56.4 mm (2.2 in)
2009	57.4 mm (2.3 in)
2010	91.2 mm (3.6 in)
2011	108.2 mm (4.3 in)
2012	58.7 mm (2.3 in)

Wettest five days (Rx5day)

The wettest five days of the year at Tlacotepec, 1955 to 2012. The record is 195.3 mm (7.7 in) in 1968, marked on the chart; the median year is 126.8 mm (5.0 in).

Wettest five days (Rx5day) at Tlacotepec by year
Year	Wettest five days (Rx5day)
1955	167.4 mm (6.6 in)
1956	152.7 mm (6.0 in)
1957	87.2 mm (3.4 in)
1958	120.0 mm (4.7 in)
1959	12.9 mm (0.5 in)
1960	162.9 mm (6.4 in)
1961	95.6 mm (3.8 in)
1962	135.8 mm (5.3 in)
1963	109.6 mm (4.3 in)
1964	114.6 mm (4.5 in)
1965	97.6 mm (3.8 in)
1966	116.9 mm (4.6 in)
1967	131.6 mm (5.2 in)
1968	195.3 mm (7.7 in)
1969	155.9 mm (6.1 in)
1970	158.6 mm (6.2 in)
1971	105.2 mm (4.1 in)
1972	108.7 mm (4.3 in)
1973	110.5 mm (4.4 in)
1974	153.9 mm (6.1 in)
1975	152.9 mm (6.0 in)
1976	133.8 mm (5.3 in)
1977	132.1 mm (5.2 in)
1978	150.6 mm (5.9 in)
1979	82.3 mm (3.2 in)
1980	90.9 mm (3.6 in)
1981	144.5 mm (5.7 in)
1982	100.9 mm (4.0 in)
1983	116.7 mm (4.6 in)
1984	134.4 mm (5.3 in)
1985	95.5 mm (3.8 in)
1986	98.5 mm (3.9 in)
1987	120.5 mm (4.7 in)
1988	139.2 mm (5.5 in)
1989	81.9 mm (3.2 in)
1990	100.6 mm (4.0 in)
1991	98.8 mm (3.9 in)
1992	95.3 mm (3.8 in)
1993	145.3 mm (5.7 in)
1994	152.6 mm (6.0 in)
1995	127.8 mm (5.0 in)
1996	146.3 mm (5.8 in)
1997	125.7 mm (4.9 in)
1998	167.7 mm (6.6 in)
1999	194.5 mm (7.7 in)
2000	137.3 mm (5.4 in)
2001	100.2 mm (3.9 in)
2002	116.1 mm (4.6 in)
2003	177.6 mm (7.0 in)
2004	116.6 mm (4.6 in)
2005	114.8 mm (4.5 in)
2006	90.2 mm (3.6 in)
2007	130.1 mm (5.1 in)
2008	124.2 mm (4.9 in)
2009	170.9 mm (6.7 in)
2010	155.7 mm (6.1 in)
2011	147.8 mm (5.8 in)
2012	131.1 mm (5.2 in)

Longest dry spell (CDD)

The longest dry spell of the year at Tlacotepec, 1955 to 2012. The record is 147 days in 1998, marked on the chart; the median year is 64 days.

Longest dry spell (CDD) at Tlacotepec by year
Year	Longest dry spell (CDD)
1955	30 days
1956	111 days
1957	66 days
1958	79 days
1959	85 days
1960	61 days
1961	73 days
1962	101 days
1963	78 days
1964	43 days
1965	53 days
1966	63 days
1967	67 days
1968	27 days
1969	77 days
1970	122 days
1971	59 days
1972	31 days
1973	57 days
1974	74 days
1975	54 days
1976	58 days
1977	58 days
1978	49 days
1979	48 days
1980	73 days
1981	61 days
1982	77 days
1983	72 days
1984	62 days
1985	40 days
1986	42 days
1987	62 days
1988	62 days
1989	131 days
1990	43 days
1991	123 days
1992	36 days
1993	72 days
1994	85 days
1995	40 days
1996	68 days
1997	41 days
1998	147 days
1999	79 days
2000	73 days
2001	71 days
2002	46 days
2003	88 days
2004	57 days
2005	65 days
2006	55 days
2007	70 days
2008	114 days
2009	36 days
2010	74 days
2011	104 days
2012	55 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

52 years, 1956 to 2012

A day with at least 59.7 mm (2.4 in) of rain is expected about once in 2 years. A day with at least 114.1 mm (4.5 in) of rain is expected about once in 100 years.

Rainfall return levels at Tlacotepec: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	59.7 mm (2.4 in)
5 years	73.7 mm (2.9 in)
10 years	83.2 mm (3.3 in)
25 years	95.4 mm (3.8 in)
50 years	104.7 mm (4.1 in)
100 years	114.1 mm (4.5 in)	Longer than the 52 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, 52 years of values from 1956 to 2012.

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: 108.2 mm (4.3 in) in 2011; 98.3 mm (3.9 in) in 2005; 94.5 mm (3.7 in) in 2003.

Station Changes

1 suspected

One change was suspected in the annual mean temperature of Tlacotepec, at 1977. Each is measured against neighbouring stations.

Relative to 5 neighbouring stations, the station's annual mean temperature from 1977 ran 0.4 C (0.7 F) lower than in the years before (possible change).

Suspected changes in the annual mean temperature at Tlacotepec, against neighbouring stations
Year	Shift (C)	Shift (F)	Strength	Neighbours
1977	-0.4	-0.7	possible	5

Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.

Download the Data

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