Amatlan de Caas (Smn) Weather Records (MXN00018003)

Record envelope, standing records and threshold days for Amatlan de Caas (Smn) (MXN00018003), Mexico, with 32 years of record.

Key Facts for Amatlan de Caas (Smn)

Amatlan de Caas (Smn) (MXN00018003) is a weather station in Mexico at 20.80 latitude and -104.40 longitude, 798 m (2,618 ft) above sea level.
The station reports from 1943 to 1974, 32 years of record.
1,464 records set at Amatlan de Caas (Smn) still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.

About the Station

Location: Mexico, 20.80 latitude, -104.40 longitude.
Elevation: 798 m (2,618 ft).
Period of record: 1943 to 1974, 32 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 Amatlan de Caas (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 Amatlan de Caas (Smn), with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	40.6 C (105.1 F)	3.9 C (39.0 F)	n/a	n/a
Feb	38.9 C (102.0 F)	3.9 C (39.0 F)	n/a	n/a
Mar	42.8 C (109.0 F)	6.7 C (44.1 F)	n/a	n/a
Apr	43.9 C (111.0 F)	6.7 C (44.1 F)	n/a	n/a
May	47.8 C (118.0 F)	11.7 C (53.1 F)	n/a	n/a
Jun	47.8 C (118.0 F)	12.8 C (55.0 F)	n/a	n/a
Jul	42.8 C (109.0 F)	11.1 C (52.0 F)	n/a	n/a
Aug	43.9 C (111.0 F)	13.9 C (57.0 F)	n/a	n/a
Sep	41.7 C (107.1 F)	12.8 C (55.0 F)	n/a	n/a
Oct	42.8 C (109.0 F)	10.0 C (50.0 F)	n/a	n/a
Nov	38.9 C (102.0 F)	6.7 C (44.1 F)	n/a	n/a
Dec	36.7 C (98.1 F)	5.6 C (42.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Amatlan de Caas (Smn) still stand. 1948 holds the most, with 182.

Standing records at Amatlan de Caas (Smn) by the year they were set
Year set	Standing records
1945	123
1946	116
1947	181
1948	182
1949	31
1950	30
1951	33
1952	37
1953	81
1954	85
1955	43
1956	26
1957	48
1958	4
1959	20
1960	27
1961	21
1962	65
1963	43
1964	22
1965	11
1966	19
1967	40
1968	19
1969	27
1970	23
1971	21
1972	21
1973	34
1974	31

Wettest Day of Each Month

Aug: 103.9 mm (4.1 in)

The wettest day on record for each calendar month at Amatlan de Caas (Smn). The most was 103.9 mm (4.1 in) on 10 August 1946.

Record daily precipitation for each month at Amatlan de Caas (Smn)
Month	Record daily precipitation (mm)	Date
Jan	51.8 mm (2.0 in)	22 January 1961
Feb	16.8 mm (0.7 in)	2 February 1968
Mar	67.8 mm (2.7 in)	4 March 1968
Apr	37.8 mm (1.5 in)	17 April 1959
May	58.9 mm (2.3 in)	27 May 1972
Jun	86.9 mm (3.4 in)	20 June 1950
Jul	88.9 mm (3.5 in)	29 July 1953
Aug	103.9 mm (4.1 in)	10 August 1946
Sep	86.9 mm (3.4 in)	8 September 1958
Oct	71.9 mm (2.8 in)	21 October 1962
Nov	35.8 mm (1.4 in)	24 November 1972
Dec	47.0 mm (1.9 in)	12 December 1963

Period of Record Coverage

1945 to 1974

30 years of record at Amatlan de Caas (Smn), 1945 to 1974. 3 years have data for under 90 percent of days and are left out of rankings: 1945, 1949, 1974.

Days with data per year at Amatlan de Caas (Smn)
Year	Days with data	Share of year	Complete
1945	275	75%	No
1946	365	100%	Yes
1947	363	99%	Yes
1948	366	100%	Yes
1949	306	84%	No
1950	365	100%	Yes
1951	365	100%	Yes
1952	365	100%	Yes
1953	365	100%	Yes
1954	365	100%	Yes
1955	364	100%	Yes
1956	366	100%	Yes
1957	364	100%	Yes
1958	364	100%	Yes
1959	364	100%	Yes
1960	366	100%	Yes
1961	364	100%	Yes
1962	364	100%	Yes
1963	365	100%	Yes
1964	365	100%	Yes
1965	333	91%	Yes
1966	362	99%	Yes
1967	364	100%	Yes
1968	365	100%	Yes
1969	358	98%	Yes
1970	365	100%	Yes
1971	364	100%	Yes
1972	363	99%	Yes
1973	365	100%	Yes
1974	242	66%	No

Latest Records

No records were set at this station in the latest data.

Climate Trend

21 complete years, 1946 to 1973

One stripe for each of 21 complete years at Amatlan de Caas (Smn), 1946 to 1973. Blue stripes are years cooler than the station's own mean of 24.9 C (76.8 F); red stripes are warmer. The coolest year was 1973, at 23.8 C (74.8 F), and the warmest was 1946, at 28.0 C (82.4 F). The strongest colour marks a difference of 3.1 C (5.6 F).

Annual mean temperature at Amatlan de Caas (Smn) as warming stripes, 1946 to 1973
Year	Annual mean temperature	Difference from the station mean
1946	28.0 C	+3.10 C
1947	24.8 C	-0.07 C
1950	26.0 C	+1.08 C
1951	25.7 C	+0.78 C
1952	25.6 C	+0.75 C
1953	25.8 C	+0.90 C
1955	24.5 C	-0.39 C
1956	24.7 C	-0.21 C
1959	24.7 C	-0.19 C
1960	24.9 C	+0.02 C
1961	24.8 C	-0.06 C
1963	25.3 C	+0.37 C
1964	24.5 C	-0.37 C
1966	24.2 C	-0.66 C
1967	24.1 C	-0.83 C
1968	24.1 C	-0.81 C
1969	24.6 C	-0.32 C
1970	24.2 C	-0.69 C
1971	24.1 C	-0.78 C
1972	24.4 C	-0.46 C
1973	23.8 C	-1.12 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

1943 to 1974

Yearly extremes at Amatlan de Caas (Smn): the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	47.8 C (118.0 F)	1949	41.4 C (106.5 F)	30
Coldest night (TNn)	3.9 C (39.0 F)	1955	6.7 C (44.1 F)	30
Wettest day (Rx1day)	103.9 mm (4.1 in)	1946	59.7 mm (2.4 in)	32
Wettest five days (Rx5day)	181.6 mm (7.1 in)	1946	118.9 mm (4.7 in)	32
Longest dry spell (CDD)	147 days	1972	76 days	32

Hottest day (TXx)

The hottest day of the year at Amatlan de Caas (Smn), 1943 to 1974. The record is 47.8 C (118.0 F) in 1949, marked on the chart; the median year is 41.4 C (106.5 F).

Hottest day (TXx) at Amatlan de Caas (Smn) by year
Year	Hottest day (TXx)
1943	n/a
1944	n/a
1945	39.4 C (102.9 F)
1946	42.2 C (108.0 F)
1947	40.6 C (105.1 F)
1948	35.6 C (96.1 F)
1949	47.8 C (118.0 F)
1950	42.8 C (109.0 F)
1951	42.8 C (109.0 F)
1952	47.8 C (118.0 F)
1953	43.9 C (111.0 F)
1954	45.0 C (113.0 F)
1955	41.7 C (107.1 F)
1956	41.7 C (107.1 F)
1957	40.6 C (105.1 F)
1958	41.7 C (107.1 F)
1959	40.0 C (104.0 F)
1960	43.9 C (111.0 F)
1961	42.8 C (109.0 F)
1962	43.9 C (111.0 F)
1963	40.6 C (105.1 F)
1964	41.7 C (107.1 F)
1965	42.8 C (109.0 F)
1966	40.0 C (104.0 F)
1967	40.0 C (104.0 F)
1968	38.9 C (102.0 F)
1969	40.0 C (104.0 F)
1970	40.0 C (104.0 F)
1971	40.0 C (104.0 F)
1972	41.1 C (106.0 F)
1973	41.1 C (106.0 F)
1974	40.0 C (104.0 F)

Coldest night (TNn)

The coldest night of the year at Amatlan de Caas (Smn), 1943 to 1974. The record is 3.9 C (39.0 F) in 1955, marked on the chart; the median year is 6.7 C (44.1 F).

Coldest night (TNn) at Amatlan de Caas (Smn) by year
Year	Coldest night (TNn)
1943	n/a
1944	n/a
1945	10.0 C (50.0 F)
1946	10.6 C (51.1 F)
1947	8.9 C (48.0 F)
1948	6.7 C (44.1 F)
1949	7.8 C (46.0 F)
1950	5.6 C (42.1 F)
1951	7.8 C (46.0 F)
1952	7.8 C (46.0 F)
1953	5.6 C (42.1 F)
1954	6.7 C (44.1 F)
1955	3.9 C (39.0 F)
1956	6.7 C (44.1 F)
1957	6.7 C (44.1 F)
1958	6.7 C (44.1 F)
1959	6.7 C (44.1 F)
1960	5.0 C (41.0 F)
1961	7.8 C (46.0 F)
1962	6.7 C (44.1 F)
1963	8.9 C (48.0 F)
1964	7.8 C (46.0 F)
1965	8.9 C (48.0 F)
1966	7.8 C (46.0 F)
1967	3.9 C (39.0 F)
1968	5.0 C (41.0 F)
1969	6.7 C (44.1 F)
1970	3.9 C (39.0 F)
1971	3.9 C (39.0 F)
1972	7.8 C (46.0 F)
1973	5.0 C (41.0 F)
1974	5.0 C (41.0 F)

Wettest day (Rx1day)

The wettest day of the year at Amatlan de Caas (Smn), 1943 to 1974. The record is 103.9 mm (4.1 in) in 1946, marked on the chart; the median year is 59.7 mm (2.4 in).

Wettest day (Rx1day) at Amatlan de Caas (Smn) by year
Year	Wettest day (Rx1day)
1943	60.7 mm (2.4 in)
1944	58.7 mm (2.3 in)
1945	51.8 mm (2.0 in)
1946	103.9 mm (4.1 in)
1947	57.4 mm (2.3 in)
1948	79.8 mm (3.1 in)
1949	64.8 mm (2.6 in)
1950	86.9 mm (3.4 in)
1951	57.4 mm (2.3 in)
1952	72.9 mm (2.9 in)
1953	88.9 mm (3.5 in)
1954	39.9 mm (1.6 in)
1955	3.8 mm (0.15 in)
1956	7.9 mm (0.31 in)
1957	47.8 mm (1.9 in)
1958	86.9 mm (3.4 in)
1959	53.8 mm (2.1 in)
1960	49.8 mm (2.0 in)
1961	63.8 mm (2.5 in)
1962	71.9 mm (2.8 in)
1963	47.0 mm (1.9 in)
1964	51.8 mm (2.0 in)
1965	51.8 mm (2.0 in)
1966	84.8 mm (3.3 in)
1967	43.9 mm (1.7 in)
1968	81.8 mm (3.2 in)
1969	72.9 mm (2.9 in)
1970	46.0 mm (1.8 in)
1971	70.9 mm (2.8 in)
1972	64.8 mm (2.6 in)
1973	67.8 mm (2.7 in)
1974	47.0 mm (1.9 in)

Wettest five days (Rx5day)

The wettest five days of the year at Amatlan de Caas (Smn), 1943 to 1974. The record is 181.6 mm (7.1 in) in 1946, marked on the chart; the median year is 118.9 mm (4.7 in).

Wettest five days (Rx5day) at Amatlan de Caas (Smn) by year
Year	Wettest five days (Rx5day)
1943	95.3 mm (3.8 in)
1944	115.4 mm (4.5 in)
1945	81.0 mm (3.2 in)
1946	181.6 mm (7.1 in)
1947	136.8 mm (5.4 in)
1948	145.4 mm (5.7 in)
1949	122.0 mm (4.8 in)
1950	133.4 mm (5.3 in)
1951	125.3 mm (4.9 in)
1952	121.3 mm (4.8 in)
1953	105.4 mm (4.1 in)
1954	74.6 mm (2.9 in)
1955	10.9 mm (0.4 in)
1956	11.8 mm (0.5 in)
1957	62.8 mm (2.5 in)
1958	108.5 mm (4.3 in)
1959	111.0 mm (4.4 in)
1960	103.6 mm (4.1 in)
1961	169.2 mm (6.7 in)
1962	173.1 mm (6.8 in)
1963	124.5 mm (4.9 in)
1964	139.5 mm (5.5 in)
1965	116.4 mm (4.6 in)
1966	166.4 mm (6.6 in)
1967	124.5 mm (4.9 in)
1968	129.4 mm (5.1 in)
1969	107.3 mm (4.2 in)
1970	86.2 mm (3.4 in)
1971	130.6 mm (5.1 in)
1972	93.9 mm (3.7 in)
1973	76.2 mm (3.0 in)
1974	162.6 mm (6.4 in)

Longest dry spell (CDD)

The longest dry spell of the year at Amatlan de Caas (Smn), 1943 to 1974. The record is 147 days in 1972, marked on the chart; the median year is 76 days.

Longest dry spell (CDD) at Amatlan de Caas (Smn) by year
Year	Longest dry spell (CDD)
1943	38 days
1944	22 days
1945	85 days
1946	76 days
1947	62 days
1948	40 days
1949	31 days
1950	82 days
1951	75 days
1952	58 days
1953	30 days
1954	30 days
1955	53 days
1956	105 days
1957	110 days
1958	87 days
1959	53 days
1960	116 days
1961	94 days
1962	62 days
1963	102 days
1964	60 days
1965	59 days
1966	61 days
1967	123 days
1968	83 days
1969	89 days
1970	98 days
1971	132 days
1972	147 days
1973	83 days
1974	75 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 Amatlan de Caas (Smn) standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Amatlan de Caas (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).