San Sebastian Tlacotepec de D Weather Records (MXN00021094)

Record envelope, standing records and threshold days for San Sebastian Tlacotepec de D (MXN00021094), Mexico, with 56 years of record.

Key Facts for San Sebastian Tlacotepec de D

San Sebastian Tlacotepec de D (MXN00021094) is a weather station in Mexico at 18.45 latitude and -96.78 longitude, 91 m (298 ft) above sea level.
The station reports from 1954 to 2009, 56 years of record.
1,464 records set at San Sebastian Tlacotepec de D still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
San Sebastian Tlacotepec de D set a daily record precipitation of 19.8 mm (0.8 in) on 28 December 2009.

About the Station

Location: Mexico, 18.45 latitude, -96.78 longitude.
Elevation: 91 m (298 ft).
Period of record: 1954 to 2009, 56 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 San Sebastian Tlacotepec de D. 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 San Sebastian Tlacotepec de D, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	37.8 C (100.0 F)	6.7 C (44.1 F)	n/a	n/a
Feb	40.0 C (104.0 F)	5.6 C (42.1 F)	n/a	n/a
Mar	42.8 C (109.0 F)	8.9 C (48.0 F)	n/a	n/a
Apr	42.8 C (109.0 F)	10.6 C (51.1 F)	n/a	n/a
May	42.8 C (109.0 F)	11.7 C (53.1 F)	n/a	n/a
Jun	40.0 C (104.0 F)	11.7 C (53.1 F)	n/a	n/a
Jul	40.0 C (104.0 F)	11.7 C (53.1 F)	n/a	n/a
Aug	38.9 C (102.0 F)	11.7 C (53.1 F)	n/a	n/a
Sep	37.8 C (100.0 F)	11.7 C (53.1 F)	n/a	n/a
Oct	36.7 C (98.1 F)	8.9 C (48.0 F)	n/a	n/a
Nov	35.0 C (95.0 F)	5.6 C (42.1 F)	n/a	n/a
Dec	36.7 C (98.1 F)	8.9 C (48.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at San Sebastian Tlacotepec de D still stand. 2008 holds the most, with 166.

Standing records at San Sebastian Tlacotepec de D by the year they were set
Year set	Standing records
1954	42
1955	84
1956	33
1957	57
1958	58
1959	38
1960	50
1961	47
1962	60
1963	5
1964	43
1965	26
1966	46
1967	24
1968	44
1969	37
1970	34
1971	58
1972	50
1973	28
1974	33
1975	25
1976	40
1977	24
1978	22
1979	30
1980	25
1981	2
1983	50
1984	29
2007	118
2008	166
2009	36

Wettest Day of Each Month

Aug: 190.8 mm (7.5 in)

The wettest day on record for each calendar month at San Sebastian Tlacotepec de D. The most was 190.8 mm (7.5 in) on 21 August 1971.

Record daily precipitation for each month at San Sebastian Tlacotepec de D
Month	Record daily precipitation (mm)	Date
Jan	89.9 mm (3.5 in)	11 January 1981
Feb	60.5 mm (2.4 in)	3 February 1984
Mar	52.6 mm (2.1 in)	28 March 1957
Apr	182.9 mm (7.2 in)	14 April 1964
May	179.8 mm (7.1 in)	26 May 2007
Jun	170.2 mm (6.7 in)	2 June 1958
Jul	180.3 mm (7.1 in)	8 July 1984
Aug	190.8 mm (7.5 in)	21 August 1971
Sep	179.8 mm (7.1 in)	8 September 1979
Oct	151.9 mm (6.0 in)	1 October 1958
Nov	88.4 mm (3.5 in)	17 November 1955
Dec	71.9 mm (2.8 in)	30 December 1984

Period of Record Coverage

1954 to 2009

34 years of record at San Sebastian Tlacotepec de D, 1954 to 2009. 6 years have data for under 90 percent of days and are left out of rankings: 1963, 1971, 1981, 1982, 1983, 1984.

Days with data per year at San Sebastian Tlacotepec de D
Year	Days with data	Share of year	Complete
1954	329	90%	Yes
1955	364	100%	Yes
1956	364	99%	Yes
1957	365	100%	Yes
1958	362	99%	Yes
1959	365	100%	Yes
1960	365	100%	Yes
1961	364	100%	Yes
1962	364	100%	Yes
1963	30	8%	No
1964	366	100%	Yes
1965	363	99%	Yes
1966	365	100%	Yes
1967	365	100%	Yes
1968	366	100%	Yes
1969	335	92%	Yes
1970	365	100%	Yes
1971	304	83%	No
1972	365	100%	Yes
1973	331	91%	Yes
1974	365	100%	Yes
1975	365	100%	Yes
1976	366	100%	Yes
1977	364	100%	Yes
1978	364	100%	Yes
1979	364	100%	Yes
1980	364	99%	Yes
1981	151	41%	No
1982	61	17%	No
1983	242	66%	No
1984	304	83%	No
2007	356	98%	Yes
2008	362	99%	Yes
2009	361	99%	Yes

Latest Records

Latest records at San Sebastian Tlacotepec de D
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
28 December 2009	San Sebastian Tlacotepec de D, MX	daily rain	19.8 mm (0.8 in)	7.9 mm (0.31 in)	0 years	12 of 100 (Routine)
24 December 2009	San Sebastian Tlacotepec de D, MX	daily high max	35.0 C (95.0 F)	2.2 C (4.0 F)	39 years	21 of 100 (Routine)
2 December 2009	San Sebastian Tlacotepec de D, MX	daily rain	15.5 mm (0.6 in)	7.1 mm (0.28 in)	48 years	20 of 100 (Routine)
24 November 2009	San Sebastian Tlacotepec de D, MX	daily rain	55.4 mm (2.2 in)	28.5 mm (1.1 in)	35 years	35 of 100 (Notable)
17 November 2009	San Sebastian Tlacotepec de D, MX	daily low max	21.7 C (71.1 F)	1.1 C (2.0 F)	39 years	19 of 100 (Routine)
9 November 2009	San Sebastian Tlacotepec de D, MX	daily high max (Tie)	31.7 C (89.1 F)	tie	52 years	5 of 100 (Routine)
30 October 2009	San Sebastian Tlacotepec de D, MX	daily rain	39.4 mm (1.6 in)	5.4 mm (0.21 in)	48 years	21 of 100 (Routine)
30 October 2009	San Sebastian Tlacotepec de D, MX	daily high max (Tie)	35.0 C (95.0 F)	tie	35 years	3 of 100 (Routine)
24 October 2009	San Sebastian Tlacotepec de D, MX	daily high max (Tie)	32.8 C (91.0 F)	tie	40 years	4 of 100 (Routine)
17 October 2009	San Sebastian Tlacotepec de D, MX	daily rain	111.8 mm (4.4 in)	64.8 mm (2.6 in)	30 years	43 of 100 (Notable)
8 October 2009	San Sebastian Tlacotepec de D, MX	daily high max (Tie)	35.6 C (96.1 F)	tie	47 years	4 of 100 (Routine)
6 October 2009	San Sebastian Tlacotepec de D, MX	daily high max (Tie)	35.6 C (96.1 F)	tie	2 years	1 of 100 (Routine)
5 October 2009	San Sebastian Tlacotepec de D, MX	daily high max	35.6 C (96.1 F)	0.6 C (1.1 F)	36 years	17 of 100 (Routine)
4 October 2009	San Sebastian Tlacotepec de D, MX	daily high max	35.6 C (96.1 F)	0.6 C (1.1 F)	50 years	21 of 100 (Routine)
3 October 2009	San Sebastian Tlacotepec de D, MX	daily high max	33.9 C (93.0 F)	1.1 C (2.0 F)	55 years	24 of 100 (Routine)
29 September 2009	San Sebastian Tlacotepec de D, MX	daily low min (Tie)	13.9 C (57.0 F)	tie	0 years	1 of 100 (Routine)
26 September 2009	San Sebastian Tlacotepec de D, MX	daily low min (Tie)	13.9 C (57.0 F)	tie	0 years	1 of 100 (Routine)
24 September 2009	San Sebastian Tlacotepec de D, MX	daily low max (Tie)	25.0 C (77.0 F)	tie	44 years	4 of 100 (Routine)
23 September 2009	San Sebastian Tlacotepec de D, MX	daily low max (Tie)	25.0 C (77.0 F)	tie	34 years	3 of 100 (Routine)
19 September 2009	San Sebastian Tlacotepec de D, MX	daily low max (Tie)	26.7 C (80.1 F)	tie	32 years	3 of 100 (Routine)

Climate Trend

25 complete years, 1955 to 2009

One stripe for each of 25 complete years at San Sebastian Tlacotepec de D, 1955 to 2009. Blue stripes are years cooler than the station's own mean of 24.0 C (75.1 F); red stripes are warmer. The coolest year was 1979, at 22.6 C (72.6 F), and the warmest was 1962, at 25.2 C (77.3 F). The strongest colour marks a difference of 1.4 C (2.5 F).

Annual mean temperature at San Sebastian Tlacotepec de D as warming stripes, 1955 to 2009
Year	Annual mean temperature	Difference from the station mean
1955	25.2 C	+1.21 C
1956	24.2 C	+0.22 C
1957	24.8 C	+0.79 C
1958	24.5 C	+0.54 C
1959	23.9 C	-0.07 C
1960	24.3 C	+0.33 C
1961	24.5 C	+0.52 C
1962	25.2 C	+1.21 C
1964	23.0 C	-0.95 C
1965	23.7 C	-0.27 C
1966	23.6 C	-0.35 C
1967	24.2 C	+0.23 C
1968	24.2 C	+0.23 C
1970	24.9 C	+0.91 C
1972	25.0 C	+1.00 C
1974	24.2 C	+0.19 C
1975	24.6 C	+0.58 C
1976	22.8 C	-1.21 C
1977	23.3 C	-0.63 C
1978	22.8 C	-1.22 C
1979	22.6 C	-1.39 C
1980	23.6 C	-0.42 C
2007	24.1 C	+0.13 C
2008	23.3 C	-0.67 C
2009	23.1 C	-0.86 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

1954 to 2009

Yearly extremes at San Sebastian Tlacotepec de D: 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)	2008	39.5 C (103.0 F)	34
Coldest night (TNn)	5.6 C (42.1 F)	1960	8.9 C (48.0 F)	34
Wettest day (Rx1day)	190.8 mm (7.5 in)	1971	123.6 mm (4.9 in)	34
Wettest five days (Rx5day)	572.5 mm (22.5 in)	1970	286.3 mm (11.3 in)	34
Longest dry spell (CDD)	60 days	1984	18 days	34

Hottest day (TXx)

The hottest day of the year at San Sebastian Tlacotepec de D, 1954 to 2009. The record is 42.8 C (109.0 F) in 2008, marked on the chart; the median year is 39.5 C (103.0 F).

Hottest day (TXx) at San Sebastian Tlacotepec de D by year
Year	Hottest day (TXx)
1954	37.8 C (100.0 F)
1955	40.0 C (104.0 F)
1956	38.9 C (102.0 F)
1957	40.0 C (104.0 F)
1958	38.9 C (102.0 F)
1959	36.7 C (98.1 F)
1960	40.0 C (104.0 F)
1961	40.0 C (104.0 F)
1962	38.9 C (102.0 F)
1963	35.6 C (96.1 F)
1964	38.9 C (102.0 F)
1965	37.8 C (100.0 F)
1966	38.9 C (102.0 F)
1967	38.9 C (102.0 F)
1968	40.0 C (104.0 F)
1969	40.0 C (104.0 F)
1970	40.0 C (104.0 F)
1971	41.1 C (106.0 F)
1972	40.0 C (104.0 F)
1973	40.0 C (104.0 F)
1974	40.6 C (105.1 F)
1975	40.0 C (104.0 F)
1976	38.9 C (102.0 F)
1977	38.9 C (102.0 F)
1978	38.9 C (102.0 F)
1979	38.9 C (102.0 F)
1980	38.9 C (102.0 F)
1981	37.8 C (100.0 F)
1982	36.7 C (98.1 F)
1983	40.6 C (105.1 F)
1984	41.7 C (107.1 F)
2007	40.6 C (105.1 F)
2008	42.8 C (109.0 F)
2009	41.7 C (107.1 F)

Coldest night (TNn)

The coldest night of the year at San Sebastian Tlacotepec de D, 1954 to 2009. The record is 5.6 C (42.1 F) in 1960, marked on the chart; the median year is 8.9 C (48.0 F).

Coldest night (TNn) at San Sebastian Tlacotepec de D by year
Year	Coldest night (TNn)
1954	8.9 C (48.0 F)
1955	7.8 C (46.0 F)
1956	8.3 C (46.9 F)
1957	8.9 C (48.0 F)
1958	7.8 C (46.0 F)
1959	11.7 C (53.1 F)
1960	5.6 C (42.1 F)
1961	10.0 C (50.0 F)
1962	8.9 C (48.0 F)
1963	10.0 C (50.0 F)
1964	10.0 C (50.0 F)
1965	10.0 C (50.0 F)
1966	6.7 C (44.1 F)
1967	8.9 C (48.0 F)
1968	8.9 C (48.0 F)
1969	10.6 C (51.1 F)
1970	8.9 C (48.0 F)
1971	10.6 C (51.1 F)
1972	10.0 C (50.0 F)
1973	10.0 C (50.0 F)
1974	10.0 C (50.0 F)
1975	8.9 C (48.0 F)
1976	7.8 C (46.0 F)
1977	8.9 C (48.0 F)
1978	10.6 C (51.1 F)
1979	8.9 C (48.0 F)
1980	8.9 C (48.0 F)
1981	10.0 C (50.0 F)
1982	16.7 C (62.1 F)
1983	5.6 C (42.1 F)
1984	8.9 C (48.0 F)
2007	8.9 C (48.0 F)
2008	10.0 C (50.0 F)
2009	10.0 C (50.0 F)

Wettest day (Rx1day)

The wettest day of the year at San Sebastian Tlacotepec de D, 1954 to 2009. The record is 190.8 mm (7.5 in) in 1971, marked on the chart; the median year is 123.6 mm (4.9 in).

Wettest day (Rx1day) at San Sebastian Tlacotepec de D by year
Year	Wettest day (Rx1day)
1954	115.8 mm (4.6 in)
1955	145.3 mm (5.7 in)
1956	106.9 mm (4.2 in)
1957	99.8 mm (3.9 in)
1958	170.2 mm (6.7 in)
1959	130.3 mm (5.1 in)
1960	159.8 mm (6.3 in)
1961	100.1 mm (3.9 in)
1962	78.0 mm (3.1 in)
1963	14.5 mm (0.6 in)
1964	182.9 mm (7.2 in)
1965	122.2 mm (4.8 in)
1966	134.9 mm (5.3 in)
1967	89.9 mm (3.5 in)
1968	84.6 mm (3.3 in)
1969	174.5 mm (6.9 in)
1970	156.5 mm (6.2 in)
1971	190.8 mm (7.5 in)
1972	159.8 mm (6.3 in)
1973	151.9 mm (6.0 in)
1974	125.0 mm (4.9 in)
1975	109.0 mm (4.3 in)
1976	121.9 mm (4.8 in)
1977	79.8 mm (3.1 in)
1978	129.8 mm (5.1 in)
1979	179.8 mm (7.1 in)
1980	79.0 mm (3.1 in)
1981	98.6 mm (3.9 in)
1982	75.7 mm (3.0 in)
1983	127.8 mm (5.0 in)
1984	180.3 mm (7.1 in)
2007	179.8 mm (7.1 in)
2008	108.0 mm (4.3 in)
2009	111.8 mm (4.4 in)

Wettest five days (Rx5day)

The wettest five days of the year at San Sebastian Tlacotepec de D, 1954 to 2009. The record is 572.5 mm (22.5 in) in 1970, marked on the chart; the median year is 286.3 mm (11.3 in).

Wettest five days (Rx5day) at San Sebastian Tlacotepec de D by year
Year	Wettest five days (Rx5day)
1954	223.0 mm (8.8 in)
1955	412.3 mm (16.2 in)
1956	231.1 mm (9.1 in)
1957	288.3 mm (11.4 in)
1958	420.4 mm (16.6 in)
1959	203.1 mm (8.0 in)
1960	364.3 mm (14.3 in)
1961	242.6 mm (9.6 in)
1962	254.6 mm (10.0 in)
1963	20.9 mm (0.8 in)
1964	215.5 mm (8.5 in)
1965	311.4 mm (12.3 in)
1966	279.3 mm (11.0 in)
1967	253.6 mm (10.0 in)
1968	241.1 mm (9.5 in)
1969	480.3 mm (18.9 in)
1970	572.5 mm (22.5 in)
1971	300.3 mm (11.8 in)
1972	325.2 mm (12.8 in)
1973	331.0 mm (13.0 in)
1974	300.3 mm (11.8 in)
1975	336.8 mm (13.3 in)
1976	424.7 mm (16.7 in)
1977	203.3 mm (8.0 in)
1978	335.2 mm (13.2 in)
1979	347.2 mm (13.7 in)
1980	228.4 mm (9.0 in)
1981	187.6 mm (7.4 in)
1982	160.0 mm (6.3 in)
1983	276.4 mm (10.9 in)
1984	423.2 mm (16.7 in)
2007	284.3 mm (11.2 in)
2008	341.1 mm (13.4 in)
2009	185.4 mm (7.3 in)

Longest dry spell (CDD)

The longest dry spell of the year at San Sebastian Tlacotepec de D, 1954 to 2009. The record is 60 days in 1984, marked on the chart; the median year is 18 days.

Longest dry spell (CDD) at San Sebastian Tlacotepec de D by year
Year	Longest dry spell (CDD)
1954	23 days
1955	30 days
1956	15 days
1957	14 days
1958	27 days
1959	12 days
1960	21 days
1961	22 days
1962	25 days
1963	6 days
1964	25 days
1965	19 days
1966	10 days
1967	18 days
1968	18 days
1969	16 days
1970	34 days
1971	17 days
1972	17 days
1973	20 days
1974	23 days
1975	26 days
1976	13 days
1977	14 days
1978	14 days
1979	15 days
1980	12 days
1981	11 days
1982	7 days
1983	36 days
1984	60 days
2007	19 days
2008	18 days
2009	24 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.

Download the Data

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