Alfajayucan (Smn) Weather Records (MXN00013026)

Record envelope, standing records and threshold days for Alfajayucan (Smn) (MXN00013026), Mexico, with 34 years of record.

Key Facts for Alfajayucan (Smn)

Alfajayucan (Smn) (MXN00013026) is a weather station in Mexico at 20.42 latitude and -99.33 longitude, 1,890 m (6,200 ft) above sea level.
The station reports from 1953 to 1986, 34 years of record.
1,464 records set at Alfajayucan (Smn) still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Alfajayucan (Smn) set a daily record low minimum temperature of 0.6 C (33.1 F) on 31 December 1986.

About the Station

Location: Mexico, 20.42 latitude, -99.33 longitude.
Elevation: 1,890 m (6,200 ft).
Period of record: 1953 to 1986, 34 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 Alfajayucan (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 Alfajayucan (Smn), with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	30.6 C (87.1 F)	-10.0 C (14.0 F)	n/a	n/a
Feb	31.7 C (89.1 F)	-5.0 C (23.0 F)	n/a	n/a
Mar	40.0 C (104.0 F)	-2.2 C (28.0 F)	n/a	n/a
Apr	36.7 C (98.1 F)	0.0 C (32.0 F)	n/a	n/a
May	38.9 C (102.0 F)	3.9 C (39.0 F)	n/a	n/a
Jun	35.0 C (95.0 F)	5.0 C (41.0 F)	n/a	n/a
Jul	33.9 C (93.0 F)	6.1 C (43.0 F)	n/a	n/a
Aug	33.3 C (91.9 F)	3.9 C (39.0 F)	n/a	n/a
Sep	31.7 C (89.1 F)	3.9 C (39.0 F)	n/a	n/a
Oct	31.1 C (88.0 F)	-5.0 C (23.0 F)	n/a	n/a
Nov	30.0 C (86.0 F)	-5.0 C (23.0 F)	n/a	n/a
Dec	30.0 C (86.0 F)	-10.0 C (14.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Alfajayucan (Smn) still stand. 1962 holds the most, with 120.

Standing records at Alfajayucan (Smn) by the year they were set
Year set	Standing records
1953	28
1954	47
1955	64
1956	48
1957	49
1958	76
1959	62
1960	60
1961	49
1962	120
1963	88
1964	35
1965	46
1966	47
1967	15
1968	22
1969	24
1970	28
1971	37
1972	28
1973	37
1974	34
1975	39
1976	48
1977	44
1978	31
1979	51
1980	25
1981	20
1982	25
1983	43
1984	33
1985	20
1986	41

Wettest Day of Each Month

Sep: 105.9 mm (4.2 in)

The wettest day on record for each calendar month at Alfajayucan (Smn). The most was 105.9 mm (4.2 in) on 20 September 1954.

Record daily precipitation for each month at Alfajayucan (Smn)
Month	Record daily precipitation (mm)	Date
Jan	59.9 mm (2.4 in)	22 January 1980
Feb	59.9 mm (2.4 in)	22 February 1981
Mar	30.0 mm (1.2 in)	23 March 1967
Apr	29.2 mm (1.1 in)	9 April 1954
May	64.3 mm (2.5 in)	17 May 1982
Jun	79.8 mm (3.1 in)	18 June 1975
Jul	89.9 mm (3.5 in)	23 July 1979
Aug	65.3 mm (2.6 in)	16 August 1973
Sep	105.9 mm (4.2 in)	20 September 1954
Oct	67.8 mm (2.7 in)	10 October 1973
Nov	46.0 mm (1.8 in)	15 November 1964
Dec	33.3 mm (1.3 in)	15 December 1961

Period of Record Coverage

1953 to 1986

34 years of record at Alfajayucan (Smn), 1953 to 1986. 4 years have data for under 90 percent of days and are left out of rankings: 1953, 1962, 1964, 1969.

Days with data per year at Alfajayucan (Smn)
Year	Days with data	Share of year	Complete
1953	121	33%	No
1954	365	100%	Yes
1955	365	100%	Yes
1956	365	100%	Yes
1957	365	100%	Yes
1958	364	100%	Yes
1959	365	100%	Yes
1960	366	100%	Yes
1961	353	97%	Yes
1962	326	89%	No
1963	353	97%	Yes
1964	294	80%	No
1965	353	97%	Yes
1966	353	97%	Yes
1967	353	97%	Yes
1968	354	97%	Yes
1969	307	84%	No
1970	364	100%	Yes
1971	361	99%	Yes
1972	366	100%	Yes
1973	364	100%	Yes
1974	361	99%	Yes
1975	364	100%	Yes
1976	363	99%	Yes
1977	365	100%	Yes
1978	331	91%	Yes
1979	365	100%	Yes
1980	365	100%	Yes
1981	363	99%	Yes
1982	362	99%	Yes
1983	331	91%	Yes
1984	335	92%	Yes
1985	364	100%	Yes
1986	333	91%	Yes

Latest Records

Latest records at Alfajayucan (Smn)
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
31 December 1986	Alfajayucan (Smn), MX	daily low min	0.6 C (33.1 F)	1.1 C (2.0 F)	11 years	9 of 100 (Routine)
25 December 1986	Alfajayucan (Smn), MX	daily high max	28.9 C (84.0 F)	1.7 C (3.1 F)	20 years	14 of 100 (Routine)
24 December 1986	Alfajayucan (Smn), MX	daily high max	28.9 C (84.0 F)	2.2 C (4.0 F)	20 years	15 of 100 (Routine)
15 December 1986	Alfajayucan (Smn), MX	daily high max	28.9 C (84.0 F)	3.3 C (5.9 F)	12 years	15 of 100 (Routine)
9 December 1986	Alfajayucan (Smn), MX	daily high max	27.8 C (82.0 F)	1.7 C (3.1 F)	16 years	13 of 100 (Routine)
9 December 1986	Alfajayucan (Smn), MX	daily high min (Tie)	10.0 C (50.0 F)	tie	29 years	2 of 100 (Routine)
8 December 1986	Alfajayucan (Smn), MX	daily high max	27.8 C (82.0 F)	2.2 C (4.0 F)	16 years	14 of 100 (Routine)
6 December 1986	Alfajayucan (Smn), MX	daily high max	28.9 C (84.0 F)	2.2 C (4.0 F)	8 years	11 of 100 (Routine)
4 December 1986	Alfajayucan (Smn), MX	daily high max (Tie)	26.7 C (80.1 F)	tie	16 years	2 of 100 (Routine)
3 December 1986	Alfajayucan (Smn), MX	daily high min	11.7 C (53.1 F)	1.7 C (3.1 F)	28 years	16 of 100 (Routine)
1 December 1986	Alfajayucan (Smn), MX	daily high max (Tie)	26.7 C (80.1 F)	tie	4 years	1 of 100 (Routine)
26 November 1986	Alfajayucan (Smn), MX	daily high min (Tie)	10.0 C (50.0 F)	tie	31 years	3 of 100 (Routine)
24 November 1986	Alfajayucan (Smn), MX	daily high max (Tie)	27.8 C (82.0 F)	tie	20 years	2 of 100 (Routine)
20 November 1986	Alfajayucan (Smn), MX	daily high max	28.9 C (84.0 F)	2.2 C (4.0 F)	20 years	15 of 100 (Routine)
19 November 1986	Alfajayucan (Smn), MX	monthly high max (Tie)	30.0 C (86.0 F)	tie	25 years	5 of 100 (Routine)
18 November 1986	Alfajayucan (Smn), MX	daily high max	28.9 C (84.0 F)	2.2 C (4.0 F)	16 years	14 of 100 (Routine)
15 November 1986	Alfajayucan (Smn), MX	daily high max (Tie)	27.8 C (82.0 F)	tie	0 years	0 of 100 (Routine)
11 November 1986	Alfajayucan (Smn), MX	daily high min	10.6 C (51.1 F)	0.6 C (1.1 F)	28 years	12 of 100 (Routine)
4 November 1986	Alfajayucan (Smn), MX	daily high max (Tie)	25.6 C (78.1 F)	tie	20 years	2 of 100 (Routine)
3 November 1986	Alfajayucan (Smn), MX	daily rain	27.9 mm (1.1 in)	22.8 mm (0.9 in)	28 years	44 of 100 (Notable)

Climate Trend

26 complete years, 1954 to 1985

One stripe for each of 26 complete years at Alfajayucan (Smn), 1954 to 1985. Blue stripes are years cooler than the station's own mean of 17.3 C (63.1 F); red stripes are warmer. The coolest year was 1976, at 16.1 C (61.0 F), and the warmest was 1982, at 18.3 C (64.9 F). The strongest colour marks a difference of 1.2 C (2.2 F).

Annual mean temperature at Alfajayucan (Smn) as warming stripes, 1954 to 1985
Year	Annual mean temperature	Difference from the station mean
1954	17.1 C	-0.15 C
1955	16.8 C	-0.51 C
1956	16.4 C	-0.85 C
1957	17.4 C	+0.15 C
1958	17.4 C	+0.15 C
1959	17.4 C	+0.11 C
1960	17.8 C	+0.50 C
1961	17.5 C	+0.25 C
1963	16.4 C	-0.91 C
1965	18.2 C	+0.96 C
1966	17.6 C	+0.31 C
1967	17.1 C	-0.22 C
1968	16.8 C	-0.49 C
1970	17.3 C	+0.00 C
1971	17.2 C	-0.09 C
1972	17.6 C	+0.31 C
1973	17.1 C	-0.17 C
1974	16.7 C	-0.56 C
1975	17.2 C	-0.04 C
1976	16.1 C	-1.15 C
1977	17.7 C	+0.45 C
1979	17.4 C	+0.16 C
1980	17.7 C	+0.39 C
1981	17.2 C	-0.03 C
1982	18.3 C	+1.02 C
1985	17.6 C	+0.33 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

1953 to 1986

Yearly extremes at Alfajayucan (Smn): the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	40.0 C (104.0 F)	1983	34.7 C (94.5 F)	34
Coldest night (TNn)	-10.0 C (14.0 F)	1963	-3.0 C (26.5 F)	34
Wettest day (Rx1day)	105.9 mm (4.2 in)	1954	43.7 mm (1.7 in)	34
Wettest five days (Rx5day)	194.6 mm (7.7 in)	1980	77.6 mm (3.1 in)	34
Longest dry spell (CDD)	109 days	1956	63 days	34

Hottest day (TXx)

The hottest day of the year at Alfajayucan (Smn), 1953 to 1986. The record is 40.0 C (104.0 F) in 1983, marked on the chart; the median year is 34.7 C (94.5 F).

Hottest day (TXx) at Alfajayucan (Smn) by year
Year	Hottest day (TXx)
1953	27.2 C (81.0 F)
1954	32.8 C (91.0 F)
1955	32.2 C (90.0 F)
1956	31.1 C (88.0 F)
1957	32.2 C (90.0 F)
1958	31.7 C (89.1 F)
1959	31.1 C (88.0 F)
1960	35.0 C (95.0 F)
1961	34.4 C (93.9 F)
1962	35.0 C (95.0 F)
1963	33.9 C (93.0 F)
1964	33.3 C (91.9 F)
1965	36.1 C (97.0 F)
1966	35.0 C (95.0 F)
1967	34.4 C (93.9 F)
1968	31.7 C (89.1 F)
1969	34.4 C (93.9 F)
1970	35.0 C (95.0 F)
1971	35.0 C (95.0 F)
1972	33.3 C (91.9 F)
1973	35.0 C (95.0 F)
1974	33.9 C (93.0 F)
1975	35.0 C (95.0 F)
1976	33.9 C (93.0 F)
1977	35.6 C (96.1 F)
1978	35.6 C (96.1 F)
1979	35.0 C (95.0 F)
1980	35.0 C (95.0 F)
1981	33.9 C (93.0 F)
1982	35.0 C (95.0 F)
1983	40.0 C (104.0 F)
1984	36.7 C (98.1 F)
1985	35.0 C (95.0 F)
1986	35.0 C (95.0 F)

Coldest night (TNn)

The coldest night of the year at Alfajayucan (Smn), 1953 to 1986. The record is -10.0 C (14.0 F) in 1963, marked on the chart; the median year is -3.0 C (26.5 F).

Coldest night (TNn) at Alfajayucan (Smn) by year
Year	Coldest night (TNn)
1953	-5.0 C (23.0 F)
1954	-3.3 C (26.1 F)
1955	-5.0 C (23.0 F)
1956	-7.8 C (18.0 F)
1957	-3.9 C (25.0 F)
1958	-2.2 C (28.0 F)
1959	-2.2 C (28.0 F)
1960	-1.1 C (30.0 F)
1961	-4.4 C (24.1 F)
1962	-5.0 C (23.0 F)
1963	-10.0 C (14.0 F)
1964	-10.0 C (14.0 F)
1965	-3.3 C (26.1 F)
1966	-3.3 C (26.1 F)
1967	-2.8 C (27.0 F)
1968	-2.2 C (28.0 F)
1969	0.0 C (32.0 F)
1970	-4.4 C (24.1 F)
1971	0.0 C (32.0 F)
1972	-1.1 C (30.0 F)
1973	-4.4 C (24.1 F)
1974	-3.3 C (26.1 F)
1975	-3.9 C (25.0 F)
1976	1.1 C (34.0 F)
1977	0.0 C (32.0 F)
1978	0.0 C (32.0 F)
1979	-4.4 C (24.1 F)
1980	-2.2 C (28.0 F)
1981	0.0 C (32.0 F)
1982	0.6 C (33.1 F)
1983	0.6 C (33.1 F)
1984	-2.2 C (28.0 F)
1985	0.6 C (33.1 F)
1986	-5.0 C (23.0 F)

Wettest day (Rx1day)

The wettest day of the year at Alfajayucan (Smn), 1953 to 1986. The record is 105.9 mm (4.2 in) in 1954, marked on the chart; the median year is 43.7 mm (1.7 in).

Wettest day (Rx1day) at Alfajayucan (Smn) by year
Year	Wettest day (Rx1day)
1953	32.0 mm (1.3 in)
1954	105.9 mm (4.2 in)
1955	69.9 mm (2.8 in)
1956	27.4 mm (1.1 in)
1957	41.9 mm (1.6 in)
1958	50.3 mm (2.0 in)
1959	49.8 mm (2.0 in)
1960	57.2 mm (2.3 in)
1961	33.3 mm (1.3 in)
1962	42.4 mm (1.7 in)
1963	61.0 mm (2.4 in)
1964	46.0 mm (1.8 in)
1965	42.2 mm (1.7 in)
1966	31.8 mm (1.3 in)
1967	39.9 mm (1.6 in)
1968	36.8 mm (1.4 in)
1969	43.4 mm (1.7 in)
1970	44.2 mm (1.7 in)
1971	34.3 mm (1.4 in)
1972	43.9 mm (1.7 in)
1973	67.8 mm (2.7 in)
1974	49.8 mm (2.0 in)
1975	79.8 mm (3.1 in)
1976	59.9 mm (2.4 in)
1977	34.3 mm (1.4 in)
1978	24.9 mm (1.0 in)
1979	89.9 mm (3.5 in)
1980	59.9 mm (2.4 in)
1981	59.9 mm (2.4 in)
1982	64.3 mm (2.5 in)
1983	39.9 mm (1.6 in)
1984	22.9 mm (0.9 in)
1985	33.8 mm (1.3 in)
1986	31.0 mm (1.2 in)

Wettest five days (Rx5day)

The wettest five days of the year at Alfajayucan (Smn), 1953 to 1986. The record is 194.6 mm (7.7 in) in 1980, marked on the chart; the median year is 77.6 mm (3.1 in).

Wettest five days (Rx5day) at Alfajayucan (Smn) by year
Year	Wettest five days (Rx5day)
1953	60.0 mm (2.4 in)
1954	105.9 mm (4.2 in)
1955	84.9 mm (3.3 in)
1956	61.4 mm (2.4 in)
1957	76.2 mm (3.0 in)
1958	94.2 mm (3.7 in)
1959	123.5 mm (4.9 in)
1960	68.6 mm (2.7 in)
1961	70.2 mm (2.8 in)
1962	60.5 mm (2.4 in)
1963	92.7 mm (3.6 in)
1964	61.0 mm (2.4 in)
1965	80.6 mm (3.2 in)
1966	54.2 mm (2.1 in)
1967	67.1 mm (2.6 in)
1968	75.6 mm (3.0 in)
1969	97.7 mm (3.8 in)
1970	69.3 mm (2.7 in)
1971	97.0 mm (3.8 in)
1972	70.9 mm (2.8 in)
1973	124.0 mm (4.9 in)
1974	101.4 mm (4.0 in)
1975	114.6 mm (4.5 in)
1976	149.6 mm (5.9 in)
1977	79.3 mm (3.1 in)
1978	46.3 mm (1.8 in)
1979	150.7 mm (5.9 in)
1980	194.6 mm (7.7 in)
1981	109.7 mm (4.3 in)
1982	79.0 mm (3.1 in)
1983	42.2 mm (1.7 in)
1984	62.8 mm (2.5 in)
1985	40.2 mm (1.6 in)
1986	46.8 mm (1.8 in)

Longest dry spell (CDD)

The longest dry spell of the year at Alfajayucan (Smn), 1953 to 1986. The record is 109 days in 1956, marked on the chart; the median year is 63 days.

Longest dry spell (CDD) at Alfajayucan (Smn) by year
Year	Longest dry spell (CDD)
1953	37 days
1954	98 days
1955	84 days
1956	109 days
1957	107 days
1958	63 days
1959	65 days
1960	104 days
1961	30 days
1962	30 days
1963	30 days
1964	28 days
1965	30 days
1966	23 days
1967	30 days
1968	29 days
1969	55 days
1970	66 days
1971	75 days
1972	72 days
1973	94 days
1974	46 days
1975	105 days
1976	94 days
1977	102 days
1978	79 days
1979	55 days
1980	37 days
1981	35 days
1982	62 days
1983	72 days
1984	47 days
1985	58 days
1986	90 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

32 years, 1954 to 1986

A day with at least 45.3 mm (1.8 in) of rain is expected about once in 2 years. A day with at least 116.8 mm (4.6 in) of rain is expected about once in 100 years.

Rainfall return levels at Alfajayucan (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	45.3 mm (1.8 in)
5 years	62.3 mm (2.5 in)
10 years	74.4 mm (2.9 in)
25 years	90.6 mm (3.6 in)
50 years	103.4 mm (4.1 in)	Longer than the 32 years of record
100 years	116.8 mm (4.6 in)	Longer than the 32 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, 32 years of values from 1954 to 1986.

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: 105.9 mm (4.2 in) in 1954; 89.9 mm (3.5 in) in 1979; 79.8 mm (3.1 in) in 1975.

Download the Data

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