Zapotlanejo (Smn) Weather Records (MXN00014171)

Record envelope, standing records and threshold days for Zapotlanejo (Smn) (MXN00014171), Mexico, with 74 years of record.

Key Facts for Zapotlanejo (Smn)

Zapotlanejo (Smn) (MXN00014171) is a weather station in Mexico at 20.62 latitude and -103.07 longitude, 1,515 m (4,970 ft) above sea level.
The station reports from 1939 to 2012, 74 years of record.
1,464 records set at Zapotlanejo (Smn) still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Zapotlanejo (Smn) set a daily record high maximum temperature of 35.0 C (95.0 F) on 28 January 2012.

About the Station

Location: Mexico, 20.62 latitude, -103.07 longitude.
Elevation: 1,515 m (4,970 ft).
Period of record: 1939 to 2012, 74 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 Zapotlanejo (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 Zapotlanejo (Smn), with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	38.9 C (102.0 F)	-2.2 C (28.0 F)	n/a	n/a
Feb	43.3 C (109.9 F)	-1.1 C (30.0 F)	n/a	n/a
Mar	38.3 C (100.9 F)	0.6 C (33.1 F)	n/a	n/a
Apr	38.3 C (100.9 F)	5.0 C (41.0 F)	n/a	n/a
May	38.9 C (102.0 F)	6.7 C (44.1 F)	n/a	n/a
Jun	38.9 C (102.0 F)	5.6 C (42.1 F)	n/a	n/a
Jul	36.7 C (98.1 F)	5.6 C (42.1 F)	n/a	n/a
Aug	40.0 C (104.0 F)	5.6 C (42.1 F)	n/a	n/a
Sep	40.6 C (105.1 F)	5.0 C (41.0 F)	n/a	n/a
Oct	40.6 C (105.1 F)	0.6 C (33.1 F)	n/a	n/a
Nov	37.8 C (100.0 F)	-6.1 C (21.0 F)	n/a	n/a
Dec	32.8 C (91.0 F)	-3.3 C (26.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Zapotlanejo (Smn) still stand. 1974 holds the most, with 175.

Standing records at Zapotlanejo (Smn) by the year they were set
Year set	Standing records
1942	18
1945	6
1946	102
1949	44
1950	51
1951	106
1952	72
1953	57
1954	3
1956	26
1958	1
1959	10
1960	34
1961	19
1962	15
1963	7
1964	77
1965	10
1966	12
1967	19
1968	68
1969	32
1970	36
1971	70
1972	22
1973	17
1974	175
1975	9
1976	13
1977	83
1978	18
1979	3
1986	1
1987	7
1988	10
1989	3
1990	18
1991	15
1992	13
1993	19
1994	1
1995	6
1996	8
1997	30
1998	24
1999	18
2000	12
2001	18
2002	23
2012	3

Wettest Day of Each Month

Jul: 120.9 mm (4.8 in)

The wettest day on record for each calendar month at Zapotlanejo (Smn). The most was 120.9 mm (4.8 in) on 27 July 1954.

Record daily precipitation for each month at Zapotlanejo (Smn)
Month	Record daily precipitation (mm)	Date
Jan	37.8 mm (1.5 in)	22 January 1961
Feb	30.0 mm (1.2 in)	28 February 1946
Mar	31.0 mm (1.2 in)	31 March 1946
Apr	22.4 mm (0.9 in)	4 April 1997
May	52.1 mm (2.1 in)	30 May 2000
Jun	99.8 mm (3.9 in)	23 June 1951
Jul	120.9 mm (4.8 in)	27 July 1954
Aug	83.3 mm (3.3 in)	30 August 1975
Sep	82.6 mm (3.3 in)	1 September 2000
Oct	62.0 mm (2.4 in)	25 October 2002
Nov	80.0 mm (3.1 in)	28 November 1978
Dec	59.9 mm (2.4 in)	26 December 1953

Period of Record Coverage

1942 to 2012

51 years of record at Zapotlanejo (Smn), 1942 to 2012. 17 years have data for under 90 percent of days and are left out of rankings: 1942, 1945, 1946, 1949, 1954, 1955, 1958, 1959 and others.

Days with data per year at Zapotlanejo (Smn)
Year	Days with data	Share of year	Complete
1942	164	45%	No
1945	114	31%	No
1946	327	90%	No
1949	309	85%	No
1950	362	99%	Yes
1951	363	99%	Yes
1952	365	100%	Yes
1953	365	100%	Yes
1954	95	26%	No
1955	32	9%	No
1956	366	100%	Yes
1958	301	82%	No
1959	192	53%	No
1960	357	98%	Yes
1961	365	100%	Yes
1962	241	66%	No
1963	148	41%	No
1964	184	50%	No
1965	363	99%	Yes
1966	365	100%	Yes
1967	363	99%	Yes
1968	365	100%	Yes
1969	360	99%	Yes
1970	364	100%	Yes
1971	365	100%	Yes
1972	365	100%	Yes
1973	331	91%	Yes
1974	362	99%	Yes
1975	364	100%	Yes
1976	366	100%	Yes
1977	238	65%	No
1978	364	100%	Yes
1979	244	67%	No
1986	83	23%	No
1987	364	100%	Yes
1988	365	100%	Yes
1989	364	100%	Yes
1990	316	87%	No
1991	335	92%	Yes
1992	318	87%	No
1993	337	92%	Yes
1994	354	97%	Yes
1995	350	96%	Yes
1996	358	98%	Yes
1997	361	99%	Yes
1998	365	100%	Yes
1999	365	100%	Yes
2000	335	92%	Yes
2001	365	100%	Yes
2002	364	100%	Yes
2012	31	8%	No

Latest Records

Latest records at Zapotlanejo (Smn)
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
28 January 2012	Zapotlanejo (Smn), MX	daily high max	35.0 C (95.0 F)	2.2 C (4.0 F)	40 years	26 of 100 (Routine)
21 January 2012	Zapotlanejo (Smn), MX	daily high max (Tie)	30.6 C (87.1 F)	tie	40 years	4 of 100 (Routine)
19 January 2012	Zapotlanejo (Smn), MX	daily high max (Tie)	30.6 C (87.1 F)	tie	40 years	4 of 100 (Routine)
17 January 2012	Zapotlanejo (Smn), MX	daily high max (Tie)	30.6 C (87.1 F)	tie	40 years	4 of 100 (Routine)
16 January 2012	Zapotlanejo (Smn), MX	daily high max	30.6 C (87.1 F)	0.6 C (1.1 F)	40 years	21 of 100 (Routine)
12 January 2012	Zapotlanejo (Smn), MX	daily high max (Tie)	28.9 C (84.0 F)	tie	42 years	4 of 100 (Routine)
3 January 2012	Zapotlanejo (Smn), MX	daily low max	14.4 C (57.9 F)	1.7 C (3.1 F)	60 years	30 of 100 (Routine)
2 January 2012	Zapotlanejo (Smn), MX	daily high max (Tie)	30.6 C (87.1 F)	tie	33 years	4 of 100 (Routine)
16 December 2002	Zapotlanejo (Smn), MX	daily low min (Tie)	2.8 C (37.0 F)	tie	32 years	3 of 100 (Routine)
14 December 2002	Zapotlanejo (Smn), MX	daily high max (Tie)	30.0 C (86.0 F)	tie	48 years	5 of 100 (Routine)
12 November 2002	Zapotlanejo (Smn), MX	daily rain	6.4 mm (0.25 in)	6.1 mm (0.24 in)	11 years	13 of 100 (Routine)
6 November 2002	Zapotlanejo (Smn), MX	daily low max	17.8 C (64.0 F)	2.8 C (5.0 F)	52 years	30 of 100 (Routine)
6 November 2002	Zapotlanejo (Smn), MX	daily high min (Tie)	13.9 C (57.0 F)	tie	43 years	4 of 100 (Routine)
5 November 2002	Zapotlanejo (Smn), MX	daily high min (Tie)	15.0 C (59.0 F)	tie	8 years	2 of 100 (Routine)
3 November 2002	Zapotlanejo (Smn), MX	daily rain	31.2 mm (1.2 in)	25.9 mm (1.0 in)	43 years	38 of 100 (Notable)
3 November 2002	Zapotlanejo (Smn), MX	daily low max (Tie)	20.6 C (69.1 F)	tie	52 years	5 of 100 (Routine)
2 November 2002	Zapotlanejo (Smn), MX	daily high min (Tie)	13.9 C (57.0 F)	tie	43 years	4 of 100 (Routine)
25 October 2002	Zapotlanejo (Smn), MX	monthly rain	62.0 mm (2.4 in)	10.4 mm (0.4 in)	2 years	27 of 100 (Routine)
25 October 2002	Zapotlanejo (Smn), MX	daily low max	18.9 C (66.0 F)	1.1 C (2.0 F)	28 years	17 of 100 (Routine)
5 October 2002	Zapotlanejo (Smn), MX	daily high max	37.2 C (99.0 F)	1.6 C (2.9 F)	49 years	25 of 100 (Routine)

Climate Trend

30 complete years, 1950 to 2002

One stripe for each of 30 complete years at Zapotlanejo (Smn), 1950 to 2002. Blue stripes are years cooler than the station's own mean of 19.5 C (67.0 F); red stripes are warmer. The coolest year was 1974, at 16.1 C (60.9 F), and the warmest was 1997, at 20.8 C (69.4 F). The strongest colour marks a difference of 3.4 C (6.1 F).

Annual mean temperature at Zapotlanejo (Smn) as warming stripes, 1950 to 2002
Year	Annual mean temperature	Difference from the station mean
1950	18.1 C	-1.38 C
1951	17.5 C	-1.96 C
1952	20.4 C	+0.92 C
1953	19.2 C	-0.23 C
1956	20.1 C	+0.68 C
1960	19.7 C	+0.23 C
1961	20.4 C	+0.91 C
1965	20.2 C	+0.74 C
1966	19.8 C	+0.29 C
1967	19.0 C	-0.49 C
1968	16.9 C	-2.60 C
1969	18.7 C	-0.78 C
1970	18.1 C	-1.40 C
1971	19.9 C	+0.44 C
1972	19.8 C	+0.34 C
1974	16.1 C	-3.38 C
1975	19.4 C	-0.07 C
1976	19.7 C	+0.28 C
1978	19.5 C	+0.03 C
1987	19.5 C	+0.06 C
1988	19.9 C	+0.45 C
1989	19.9 C	+0.39 C
1994	20.2 C	+0.74 C
1995	20.2 C	+0.76 C
1996	20.5 C	+1.04 C
1997	20.8 C	+1.29 C
1998	20.4 C	+0.94 C
1999	19.7 C	+0.23 C
2001	20.0 C	+0.54 C
2002	20.4 C	+0.90 C

The annual mean temperature here has risen by 0.27 C (0.03 to 0.51) per decade over 1950 to 2002. In Fahrenheit: 0.5 F (0.1 to 0.9) per decade. The slope is a straight line fitted to 30 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Zapotlanejo (Smn)
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.27 C (0.03 to 0.51) per decade	0.5 F (0.1 to 0.9) per decade	1950 to 2002	30	Rise
Mean daily maximum	0.4 C (0.1 to 0.7) per decade	0.7 F (0.1 to 1.2) per decade	1950 to 2002	30	Rise
Mean daily minimum	0.2 C (-0.1 to 0.5) per decade	0.3 F (-0.2 to 0.8) per decade	1950 to 2002	30	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

1939 to 2012

Yearly extremes at Zapotlanejo (Smn): the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	43.3 C (109.9 F)	1949	36.1 C (97.0 F)	51
Coldest night (TNn)	-6.1 C (21.0 F)	1974	0.6 C (33.1 F)	51
Wettest day (Rx1day)	120.9 mm (4.8 in)	1954	50.4 mm (2.0 in)	52
Wettest five days (Rx5day)	195.8 mm (7.7 in)	1975	101.8 mm (4.0 in)	52
Longest dry spell (CDD)	157 days	1960	65 days	52

Hottest day (TXx)

The hottest day of the year at Zapotlanejo (Smn), 1939 to 2012. The record is 43.3 C (109.9 F) in 1949, marked on the chart; the median year is 36.1 C (97.0 F).

Hottest day (TXx) at Zapotlanejo (Smn) by year
Year	Hottest day (TXx)
1939	n/a
1942	36.7 C (98.1 F)
1945	33.9 C (93.0 F)
1946	37.2 C (99.0 F)
1949	43.3 C (109.9 F)
1950	36.1 C (97.0 F)
1951	32.2 C (90.0 F)
1952	36.7 C (98.1 F)
1953	32.8 C (91.0 F)
1954	36.1 C (97.0 F)
1955	36.1 C (97.0 F)
1956	35.6 C (96.1 F)
1958	38.3 C (100.9 F)
1959	31.7 C (89.1 F)
1960	35.6 C (96.1 F)
1961	36.7 C (98.1 F)
1962	35.6 C (96.1 F)
1963	35.0 C (95.0 F)
1964	33.9 C (93.0 F)
1965	35.6 C (96.1 F)
1966	36.7 C (98.1 F)
1967	36.7 C (98.1 F)
1968	32.8 C (91.0 F)
1969	33.9 C (93.0 F)
1970	35.0 C (95.0 F)
1971	35.6 C (96.1 F)
1972	38.9 C (102.0 F)
1973	36.7 C (98.1 F)
1974	37.8 C (100.0 F)
1975	35.6 C (96.1 F)
1976	36.7 C (98.1 F)
1977	40.6 C (105.1 F)
1978	37.8 C (100.0 F)
1979	35.6 C (96.1 F)
1986	30.6 C (87.1 F)
1987	33.9 C (93.0 F)
1988	35.0 C (95.0 F)
1989	36.7 C (98.1 F)
1990	36.7 C (98.1 F)
1991	35.6 C (96.1 F)
1992	33.9 C (93.0 F)
1993	36.7 C (98.1 F)
1994	36.1 C (97.0 F)
1995	36.7 C (98.1 F)
1996	35.6 C (96.1 F)
1997	36.1 C (97.0 F)
1998	37.8 C (100.0 F)
1999	37.8 C (100.0 F)
2000	37.8 C (100.0 F)
2001	37.8 C (100.0 F)
2002	38.9 C (102.0 F)
2012	35.0 C (95.0 F)

Coldest night (TNn)

The coldest night of the year at Zapotlanejo (Smn), 1939 to 2012. The record is -6.1 C (21.0 F) in 1974, marked on the chart; the median year is 0.6 C (33.1 F).

Coldest night (TNn) at Zapotlanejo (Smn) by year
Year	Coldest night (TNn)
1939	n/a
1942	3.9 C (39.0 F)
1945	5.0 C (41.0 F)
1946	3.9 C (39.0 F)
1949	0.0 C (32.0 F)
1950	5.6 C (42.1 F)
1951	0.6 C (33.1 F)
1952	0.0 C (32.0 F)
1953	0.6 C (33.1 F)
1954	10.6 C (51.1 F)
1955	12.8 C (55.0 F)
1956	0.0 C (32.0 F)
1958	3.3 C (37.9 F)
1959	5.0 C (41.0 F)
1960	-1.1 C (30.0 F)
1961	3.9 C (39.0 F)
1962	0.6 C (33.1 F)
1963	3.9 C (39.0 F)
1964	0.6 C (33.1 F)
1965	0.6 C (33.1 F)
1966	0.6 C (33.1 F)
1967	0.6 C (33.1 F)
1968	0.6 C (33.1 F)
1969	1.1 C (34.0 F)
1970	-2.2 C (28.0 F)
1971	0.6 C (33.1 F)
1972	0.6 C (33.1 F)
1973	1.7 C (35.1 F)
1974	-6.1 C (21.0 F)
1975	0.6 C (33.1 F)
1976	0.6 C (33.1 F)
1977	0.6 C (33.1 F)
1978	0.6 C (33.1 F)
1979	5.0 C (41.0 F)
1986	0.6 C (33.1 F)
1987	0.6 C (33.1 F)
1988	0.0 C (32.0 F)
1989	2.2 C (36.0 F)
1990	2.8 C (37.0 F)
1991	2.8 C (37.0 F)
1992	1.7 C (35.1 F)
1993	0.6 C (33.1 F)
1994	3.9 C (39.0 F)
1995	4.4 C (39.9 F)
1996	3.3 C (37.9 F)
1997	-3.3 C (26.1 F)
1998	0.0 C (32.0 F)
1999	1.1 C (34.0 F)
2000	2.8 C (37.0 F)
2001	1.7 C (35.1 F)
2002	1.7 C (35.1 F)
2012	5.0 C (41.0 F)

Wettest day (Rx1day)

The wettest day of the year at Zapotlanejo (Smn), 1939 to 2012. The record is 120.9 mm (4.8 in) in 1954, marked on the chart; the median year is 50.4 mm (2.0 in).

Wettest day (Rx1day) at Zapotlanejo (Smn) by year
Year	Wettest day (Rx1day)
1939	45.0 mm (1.8 in)
1942	61.0 mm (2.4 in)
1945	4.1 mm (0.16 in)
1946	46.0 mm (1.8 in)
1949	26.7 mm (1.1 in)
1950	47.8 mm (1.9 in)
1951	99.8 mm (3.9 in)
1952	59.9 mm (2.4 in)
1953	59.9 mm (2.4 in)
1954	120.9 mm (4.8 in)
1955	9.4 mm (0.37 in)
1956	30.0 mm (1.2 in)
1958	59.9 mm (2.4 in)
1959	52.8 mm (2.1 in)
1960	65.8 mm (2.6 in)
1961	71.9 mm (2.8 in)
1962	40.9 mm (1.6 in)
1963	40.4 mm (1.6 in)
1964	36.1 mm (1.4 in)
1965	43.2 mm (1.7 in)
1966	47.0 mm (1.9 in)
1967	52.1 mm (2.1 in)
1968	88.4 mm (3.5 in)
1969	52.3 mm (2.1 in)
1970	80.3 mm (3.2 in)
1971	48.0 mm (1.9 in)
1972	45.5 mm (1.8 in)
1973	57.2 mm (2.3 in)
1974	48.0 mm (1.9 in)
1975	83.3 mm (3.3 in)
1976	49.0 mm (1.9 in)
1977	38.1 mm (1.5 in)
1978	80.0 mm (3.1 in)
1979	43.2 mm (1.7 in)
1986	31.5 mm (1.2 in)
1987	76.5 mm (3.0 in)
1988	65.5 mm (2.6 in)
1989	39.4 mm (1.6 in)
1990	47.8 mm (1.9 in)
1991	40.9 mm (1.6 in)
1992	72.9 mm (2.9 in)
1993	34.3 mm (1.4 in)
1994	57.2 mm (2.3 in)
1995	70.4 mm (2.8 in)
1996	43.2 mm (1.7 in)
1997	91.4 mm (3.6 in)
1998	72.4 mm (2.9 in)
1999	37.6 mm (1.5 in)
2000	82.6 mm (3.3 in)
2001	51.8 mm (2.0 in)
2002	62.0 mm (2.4 in)
2012	0.0 mm (0.00 in)

Wettest five days (Rx5day)

The wettest five days of the year at Zapotlanejo (Smn), 1939 to 2012. The record is 195.8 mm (7.7 in) in 1975, marked on the chart; the median year is 101.8 mm (4.0 in).

Wettest five days (Rx5day) at Zapotlanejo (Smn) by year
Year	Wettest five days (Rx5day)
1939	99.9 mm (3.9 in)
1942	158.5 mm (6.2 in)
1945	4.1 mm (0.16 in)
1946	92.4 mm (3.6 in)
1949	72.4 mm (2.9 in)
1950	109.8 mm (4.3 in)
1951	161.0 mm (6.3 in)
1952	119.9 mm (4.7 in)
1953	129.8 mm (5.1 in)
1954	170.7 mm (6.7 in)
1955	0.0 mm (0.00 in)
1956	55.3 mm (2.2 in)
1958	134.4 mm (5.3 in)
1959	80.5 mm (3.2 in)
1960	91.0 mm (3.6 in)
1961	104.3 mm (4.1 in)
1962	87.7 mm (3.5 in)
1963	75.0 mm (3.0 in)
1964	56.9 mm (2.2 in)
1965	101.9 mm (4.0 in)
1966	96.1 mm (3.8 in)
1967	92.3 mm (3.6 in)
1968	88.4 mm (3.5 in)
1969	103.4 mm (4.1 in)
1970	148.2 mm (5.8 in)
1971	115.8 mm (4.6 in)
1972	88.3 mm (3.5 in)
1973	142.6 mm (5.6 in)
1974	96.0 mm (3.8 in)
1975	195.8 mm (7.7 in)
1976	100.3 mm (3.9 in)
1977	73.1 mm (2.9 in)
1978	121.4 mm (4.8 in)
1979	109.4 mm (4.3 in)
1986	31.5 mm (1.2 in)
1987	164.1 mm (6.5 in)
1988	147.6 mm (5.8 in)
1989	82.1 mm (3.2 in)
1990	152.5 mm (6.0 in)
1991	156.2 mm (6.1 in)
1992	147.4 mm (5.8 in)
1993	106.9 mm (4.2 in)
1994	73.3 mm (2.9 in)
1995	114.4 mm (4.5 in)
1996	84.1 mm (3.3 in)
1997	155.5 mm (6.1 in)
1998	121.7 mm (4.8 in)
1999	89.7 mm (3.5 in)
2000	144.1 mm (5.7 in)
2001	64.8 mm (2.6 in)
2002	101.7 mm (4.0 in)
2012	0.0 mm (0.00 in)

Longest dry spell (CDD)

The longest dry spell of the year at Zapotlanejo (Smn), 1939 to 2012. The record is 157 days in 1960, marked on the chart; the median year is 65 days.

Longest dry spell (CDD) at Zapotlanejo (Smn) by year
Year	Longest dry spell (CDD)
1939	34 days
1942	95 days
1945	61 days
1946	45 days
1949	120 days
1950	136 days
1951	76 days
1952	83 days
1953	152 days
1954	61 days
1955	61 days
1956	130 days
1958	147 days
1959	58 days
1960	157 days
1961	47 days
1962	70 days
1963	46 days
1964	58 days
1965	119 days
1966	58 days
1967	70 days
1968	115 days
1969	147 days
1970	99 days
1971	132 days
1972	127 days
1973	101 days
1974	69 days
1975	100 days
1976	91 days
1977	78 days
1978	83 days
1979	77 days
1986	28 days
1987	53 days
1988	41 days
1989	37 days
1990	32 days
1991	56 days
1992	18 days
1993	42 days
1994	35 days
1995	40 days
1996	68 days
1997	50 days
1998	30 days
1999	31 days
2000	41 days
2001	68 days
2002	49 days
2012	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.

Download the Data

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