Atoyac Weather Records (MXN00014018)

Record envelope, standing records and threshold days for Atoyac (MXN00014018), Mexico, with 70 years of record.

Key Facts for Atoyac

Atoyac (MXN00014018) is a weather station in Mexico at 20.00 latitude and -103.50 longitude, 1,350 m (4,429 ft) above sea level.
The station reports from 1943 to 2012, 70 years of record.
1,464 records set at Atoyac still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Atoyac set a daily record high minimum temperature of 13.3 C (55.9 F) on 30 January 2012.

About the Station

Location: Mexico, 20.00 latitude, -103.50 longitude.
Elevation: 1,350 m (4,429 ft).
Period of record: 1943 to 2012, 70 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 Atoyac. 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 Atoyac, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	36.7 C (98.1 F)	0.0 C (32.0 F)	n/a	n/a
Feb	35.0 C (95.0 F)	0.0 C (32.0 F)	n/a	n/a
Mar	38.9 C (102.0 F)	3.9 C (39.0 F)	n/a	n/a
Apr	39.4 C (102.9 F)	5.0 C (41.0 F)	n/a	n/a
May	40.0 C (104.0 F)	6.7 C (44.1 F)	n/a	n/a
Jun	40.0 C (104.0 F)	10.0 C (50.0 F)	n/a	n/a
Jul	37.8 C (100.0 F)	7.8 C (46.0 F)	n/a	n/a
Aug	35.0 C (95.0 F)	10.0 C (50.0 F)	n/a	n/a
Sep	34.4 C (93.9 F)	7.2 C (45.0 F)	n/a	n/a
Oct	35.6 C (96.1 F)	5.0 C (41.0 F)	n/a	n/a
Nov	36.7 C (98.1 F)	2.2 C (36.0 F)	n/a	n/a
Dec	34.4 C (93.9 F)	0.6 C (33.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Atoyac still stand. 1946 holds the most, with 94.

Standing records at Atoyac by the year they were set
Year set	Standing records
1943	12
1944	70
1945	64
1946	94
1947	78
1948	30
1949	15
1950	11
1951	17
1952	30
1953	16
1954	15
1955	16
1956	8
1957	18
1958	25
1959	14
1960	15
1961	13
1962	4
1963	7
1964	5
1965	16
1966	22
1967	16
1968	42
1969	43
1970	16
1971	3
1972	11
1973	5
1974	8
1975	8
1976	18
1977	10
1978	4
1979	14
1980	1
1981	7
1982	7
1983	28
1984	1
1985	17
1986	18
1987	5
1988	32
1989	39
1990	19
1991	28
1992	38
1993	24
1994	29
1995	33
1996	15
1997	47
1998	18
1999	23
2000	30
2001	13
2002	18
2003	13
2004	8
2005	8
2006	19
2007	12
2008	13
2009	17
2010	19
2011	26
2012	26

All-Time Record Progression

5 new records

5 all-time records were set at Atoyac between 19 May 1983 and 17 January 1992. Each dot is a new record.

When Atoyac set new all-time records
Date	Kind	Detail
1983-05-19	Record high maximum temperature	Record high maximum temperature 38.9 C (102.0 F)
1989-05-18	Record high maximum temperature	Record high maximum temperature 39.4 C (102.9 F)
1989-06-06	Record high maximum temperature	Record high maximum temperature 40.0 C (104.0 F)
1992-01-16	Record low maximum temperature	Record low maximum temperature 14.4 C (57.9 F)
1992-01-17	Record low maximum temperature	Record low maximum temperature 13.9 C (57.0 F)

Wettest Day of Each Month

Jul: 83.1 mm (3.3 in)

The wettest day on record for each calendar month at Atoyac. The most was 83.1 mm (3.3 in) on 27 July 1972.

Record daily precipitation for each month at Atoyac
Month	Record daily precipitation (mm)	Date
Jan	70.9 mm (2.8 in)	16 January 1992
Feb	74.4 mm (2.9 in)	3 February 2010
Mar	57.2 mm (2.3 in)	3 March 1968
Apr	29.0 mm (1.1 in)	16 April 1959
May	53.8 mm (2.1 in)	31 May 1950
Jun	76.2 mm (3.0 in)	19 June 2007
Jul	83.1 mm (3.3 in)	27 July 1972
Aug	69.3 mm (2.7 in)	1 August 1993
Sep	46.5 mm (1.8 in)	10 September 1949
Oct	68.3 mm (2.7 in)	9 October 1992
Nov	54.4 mm (2.1 in)	26 November 1982
Dec	43.9 mm (1.7 in)	12 December 1963

Period of Record Coverage

1943 to 2012

70 years of record at Atoyac, 1943 to 2012. 14 years have data for under 90 percent of days and are left out of rankings: 1943, 1944, 1945, 1946, 1947, 1989, 1990, 1993 and others.

Days with data per year at Atoyac
Year	Days with data	Share of year	Complete
1943	63	17%	No
1944	269	73%	No
1945	276	76%	No
1946	257	70%	No
1947	249	68%	No
1948	340	93%	Yes
1949	334	92%	Yes
1950	335	92%	Yes
1951	365	100%	Yes
1952	366	100%	Yes
1953	365	100%	Yes
1954	365	100%	Yes
1955	365	100%	Yes
1956	366	100%	Yes
1957	364	100%	Yes
1958	363	99%	Yes
1959	363	99%	Yes
1960	365	100%	Yes
1961	364	100%	Yes
1962	365	100%	Yes
1963	365	100%	Yes
1964	366	100%	Yes
1965	365	100%	Yes
1966	365	100%	Yes
1967	365	100%	Yes
1968	365	100%	Yes
1969	365	100%	Yes
1970	365	100%	Yes
1971	365	100%	Yes
1972	366	100%	Yes
1973	365	100%	Yes
1974	365	100%	Yes
1975	365	100%	Yes
1976	366	100%	Yes
1977	365	100%	Yes
1978	365	100%	Yes
1979	365	100%	Yes
1980	366	100%	Yes
1981	364	100%	Yes
1982	365	100%	Yes
1983	364	100%	Yes
1984	366	100%	Yes
1985	365	100%	Yes
1986	365	100%	Yes
1987	365	100%	Yes
1988	365	100%	Yes
1989	273	75%	No
1990	68	19%	No
1991	363	99%	Yes
1992	363	99%	Yes
1993	304	83%	No
1994	365	100%	Yes
1995	364	100%	Yes
1996	337	92%	Yes
1997	363	99%	Yes
1998	304	83%	No
1999	334	92%	Yes
2000	351	96%	Yes
2001	319	87%	No
2002	305	84%	No
2003	324	89%	No
2004	146	40%	No
2005	363	99%	Yes
2006	365	100%	Yes
2007	365	100%	Yes
2008	361	99%	Yes
2009	365	100%	Yes
2010	364	100%	Yes
2011	365	100%	Yes
2012	31	8%	No

Latest Records

Latest records at Atoyac
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
30 January 2012	Atoyac, MX	daily high min	13.3 C (55.9 F)	2.2 C (4.0 F)	66 years	37 of 100 (Notable)
29 January 2012	Atoyac, MX	daily high min	16.7 C (62.1 F)	4.5 C (8.1 F)	65 years	47 of 100 (Notable)
29 January 2012	Atoyac, MX	daily rain	44.5 mm (1.8 in)	39.4 mm (1.6 in)	4 years	33 of 100 (Routine)
28 January 2012	Atoyac, MX	daily high min	17.2 C (63.0 F)	4.4 C (7.9 F)	18 years	32 of 100 (Routine)
27 January 2012	Atoyac, MX	daily high min	17.2 C (63.0 F)	4.4 C (7.9 F)	4 years	28 of 100 (Routine)
27 January 2012	Atoyac, MX	daily rain	1.8 mm (0.07 in)	1.8 mm (0.07 in)	68 years	20 of 100 (Routine)
26 January 2012	Atoyac, MX	daily high min	17.8 C (64.0 F)	5.0 C (9.0 F)	65 years	49 of 100 (Notable)
25 January 2012	Atoyac, MX	monthly high min (Tie)	18.3 C (64.9 F)	tie	0 years	4 of 100 (Routine)
24 January 2012	Atoyac, MX	daily high min	17.2 C (63.0 F)	5.0 C (9.0 F)	6 years	32 of 100 (Routine)
23 January 2012	Atoyac, MX	daily high min	16.7 C (62.1 F)	5.0 C (9.0 F)	4 years	31 of 100 (Routine)
22 January 2012	Atoyac, MX	daily high min	16.7 C (62.1 F)	3.4 C (6.1 F)	65 years	42 of 100 (Notable)
21 January 2012	Atoyac, MX	daily high min	16.1 C (61.0 F)	5.5 C (9.9 F)	66 years	53 of 100 (Notable)
20 January 2012	Atoyac, MX	daily high min	16.7 C (62.1 F)	0.6 C (1.1 F)	18 years	14 of 100 (Routine)
19 January 2012	Atoyac, MX	daily high min	16.1 C (61.0 F)	0.5 C (0.9 F)	18 years	14 of 100 (Routine)
18 January 2012	Atoyac, MX	daily high min	15.6 C (60.1 F)	2.8 C (5.0 F)	65 years	39 of 100 (Notable)
17 January 2012	Atoyac, MX	daily high min	15.6 C (60.1 F)	2.8 C (5.0 F)	65 years	39 of 100 (Notable)
16 January 2012	Atoyac, MX	daily high min	17.8 C (64.0 F)	4.5 C (8.1 F)	65 years	47 of 100 (Notable)
15 January 2012	Atoyac, MX	monthly high min	18.3 C (64.9 F)	0.5 C (0.9 F)	0 years	19 of 100 (Routine)
14 January 2012	Atoyac, MX	monthly high min (Tie)	17.8 C (64.0 F)	tie	0 years	4 of 100 (Routine)
13 January 2012	Atoyac, MX	monthly high min	17.8 C (64.0 F)	1.1 C (2.0 F)	0 years	22 of 100 (Routine)

Climate Trend

47 complete years, 1951 to 2011

One stripe for each of 47 complete years at Atoyac, 1951 to 2011. Blue stripes are years cooler than the station's own mean of 20.8 C (69.4 F); red stripes are warmer. The coolest year was 1968, at 19.9 C (67.8 F), and the warmest was 1994, at 22.3 C (72.1 F). The strongest colour marks a difference of 1.6 C (2.9 F).

Annual mean temperature at Atoyac as warming stripes, 1951 to 2011
Year	Annual mean temperature	Difference from the station mean
1951	20.9 C	+0.16 C
1952	20.6 C	-0.13 C
1953	20.9 C	+0.10 C
1954	20.8 C	+0.05 C
1955	20.4 C	-0.41 C
1956	20.6 C	-0.21 C
1957	20.9 C	+0.17 C
1958	20.5 C	-0.31 C
1959	20.5 C	-0.26 C
1960	20.8 C	+0.02 C
1961	20.5 C	-0.23 C
1962	20.7 C	-0.12 C
1963	20.8 C	+0.01 C
1964	20.7 C	-0.07 C
1965	20.5 C	-0.31 C
1966	20.1 C	-0.69 C
1967	20.3 C	-0.46 C
1968	19.9 C	-0.90 C
1969	20.6 C	-0.19 C
1970	20.5 C	-0.27 C
1971	20.7 C	-0.08 C
1972	21.1 C	+0.32 C
1973	20.6 C	-0.20 C
1974	20.5 C	-0.30 C
1975	20.4 C	-0.39 C
1976	20.1 C	-0.67 C
1977	20.1 C	-0.68 C
1978	20.2 C	-0.54 C
1979	20.4 C	-0.36 C
1980	20.7 C	-0.06 C
1981	20.2 C	-0.58 C
1982	21.1 C	+0.36 C
1983	20.0 C	-0.81 C
1984	20.5 C	-0.31 C
1985	20.8 C	+0.04 C
1986	21.5 C	+0.71 C
1987	20.8 C	-0.02 C
1988	21.5 C	+0.76 C
1992	20.9 C	+0.14 C
1994	22.3 C	+1.52 C
2005	21.5 C	+0.74 C
2006	21.6 C	+0.81 C
2007	21.5 C	+0.72 C
2008	21.1 C	+0.37 C
2009	21.9 C	+1.09 C
2010	21.1 C	+0.28 C
2011	21.7 C	+0.96 C

The annual mean temperature here has risen by 0.2 C (0.1 to 0.2) per decade over 1951 to 2011. In Fahrenheit: 0.3 F (0.2 to 0.4) per decade. The slope is a straight line fitted to 47 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Atoyac
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.2 C (0.1 to 0.2) per decade	0.3 F (0.2 to 0.4) per decade	1951 to 2011	47	Rise
Mean daily maximum	0.17 C (0.04 to 0.30) per decade	0.3 F (0.1 to 0.5) per decade	1951 to 2011	47	Rise
Mean daily minimum	0.2 C (0.1 to 0.3) per decade	0.3 F (0.1 to 0.5) per decade	1951 to 2011	47	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

1943 to 2012

Yearly extremes at Atoyac: 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)	1989	37.2 C (99.0 F)	70
Coldest night (TNn)	0.0 C (32.0 F)	1955	3.9 C (39.0 F)	70
Wettest day (Rx1day)	83.1 mm (3.3 in)	1972	46.0 mm (1.8 in)	70
Wettest five days (Rx5day)	165.9 mm (6.5 in)	1981	81.4 mm (3.2 in)	70
Longest dry spell (CDD)	161 days	1945	88 days	70

Hottest day (TXx)

The hottest day of the year at Atoyac, 1943 to 2012. The record is 40.0 C (104.0 F) in 1989, marked on the chart; the median year is 37.2 C (99.0 F).

Hottest day (TXx) at Atoyac by year
Year	Hottest day (TXx)
1943	35.0 C (95.0 F)
1944	37.2 C (99.0 F)
1945	37.8 C (100.0 F)
1946	38.3 C (100.9 F)
1947	37.2 C (99.0 F)
1948	37.8 C (100.0 F)
1949	36.7 C (98.1 F)
1950	36.1 C (97.0 F)
1951	36.1 C (97.0 F)
1952	37.8 C (100.0 F)
1953	36.7 C (98.1 F)
1954	36.1 C (97.0 F)
1955	36.7 C (98.1 F)
1956	35.6 C (96.1 F)
1957	36.1 C (97.0 F)
1958	36.7 C (98.1 F)
1959	35.6 C (96.1 F)
1960	37.2 C (99.0 F)
1961	37.2 C (99.0 F)
1962	36.7 C (98.1 F)
1963	36.7 C (98.1 F)
1964	37.2 C (99.0 F)
1965	36.7 C (98.1 F)
1966	35.6 C (96.1 F)
1967	38.3 C (100.9 F)
1968	37.2 C (99.0 F)
1969	37.8 C (100.0 F)
1970	37.2 C (99.0 F)
1971	36.1 C (97.0 F)
1972	36.7 C (98.1 F)
1973	36.7 C (98.1 F)
1974	36.7 C (98.1 F)
1975	35.0 C (95.0 F)
1976	35.0 C (95.0 F)
1977	34.4 C (93.9 F)
1978	36.7 C (98.1 F)
1979	37.2 C (99.0 F)
1980	37.2 C (99.0 F)
1981	36.1 C (97.0 F)
1982	37.2 C (99.0 F)
1983	38.9 C (102.0 F)
1984	36.7 C (98.1 F)
1985	36.7 C (98.1 F)
1986	38.3 C (100.9 F)
1987	36.7 C (98.1 F)
1988	37.2 C (99.0 F)
1989	40.0 C (104.0 F)
1990	35.0 C (95.0 F)
1991	38.3 C (100.9 F)
1992	35.0 C (95.0 F)
1993	36.7 C (98.1 F)
1994	39.4 C (102.9 F)
1995	39.4 C (102.9 F)
1996	38.9 C (102.0 F)
1997	38.9 C (102.0 F)
1998	39.4 C (102.9 F)
1999	38.9 C (102.0 F)
2000	37.2 C (99.0 F)
2001	38.3 C (100.9 F)
2002	38.3 C (100.9 F)
2003	39.4 C (102.9 F)
2004	35.6 C (96.1 F)
2005	40.0 C (104.0 F)
2006	37.8 C (100.0 F)
2007	38.3 C (100.9 F)
2008	38.9 C (102.0 F)
2009	38.9 C (102.0 F)
2010	38.9 C (102.0 F)
2011	40.0 C (104.0 F)
2012	33.9 C (93.0 F)

Coldest night (TNn)

The coldest night of the year at Atoyac, 1943 to 2012. The record is 0.0 C (32.0 F) in 1955, marked on the chart; the median year is 3.9 C (39.0 F).

Coldest night (TNn) at Atoyac by year
Year	Coldest night (TNn)
1943	5.6 C (42.1 F)
1944	3.9 C (39.0 F)
1945	7.8 C (46.0 F)
1946	7.8 C (46.0 F)
1947	6.7 C (44.1 F)
1948	6.1 C (43.0 F)
1949	4.4 C (39.9 F)
1950	3.3 C (37.9 F)
1951	3.3 C (37.9 F)
1952	3.9 C (39.0 F)
1953	1.7 C (35.1 F)
1954	3.3 C (37.9 F)
1955	0.0 C (32.0 F)
1956	3.3 C (37.9 F)
1957	3.9 C (39.0 F)
1958	0.6 C (33.1 F)
1959	2.8 C (37.0 F)
1960	1.7 C (35.1 F)
1961	3.9 C (39.0 F)
1962	3.3 C (37.9 F)
1963	3.9 C (39.0 F)
1964	3.9 C (39.0 F)
1965	3.3 C (37.9 F)
1966	2.2 C (36.0 F)
1967	0.6 C (33.1 F)
1968	3.9 C (39.0 F)
1969	3.9 C (39.0 F)
1970	2.8 C (37.0 F)
1971	6.7 C (44.1 F)
1972	6.7 C (44.1 F)
1973	5.0 C (41.0 F)
1974	7.2 C (45.0 F)
1975	5.0 C (41.0 F)
1976	2.2 C (36.0 F)
1977	5.0 C (41.0 F)
1978	5.0 C (41.0 F)
1979	4.4 C (39.9 F)
1980	5.0 C (41.0 F)
1981	4.4 C (39.9 F)
1982	5.0 C (41.0 F)
1983	0.0 C (32.0 F)
1984	2.8 C (37.0 F)
1985	1.7 C (35.1 F)
1986	3.3 C (37.9 F)
1987	3.3 C (37.9 F)
1988	4.4 C (39.9 F)
1989	3.9 C (39.0 F)
1990	6.1 C (43.0 F)
1991	3.9 C (39.0 F)
1992	3.9 C (39.0 F)
1993	5.0 C (41.0 F)
1994	5.0 C (41.0 F)
1995	5.0 C (41.0 F)
1996	3.9 C (39.0 F)
1997	1.7 C (35.1 F)
1998	2.8 C (37.0 F)
1999	3.9 C (39.0 F)
2000	5.0 C (41.0 F)
2001	3.9 C (39.0 F)
2002	4.4 C (39.9 F)
2003	2.8 C (37.0 F)
2004	3.9 C (39.0 F)
2005	5.0 C (41.0 F)
2006	1.7 C (35.1 F)
2007	5.6 C (42.1 F)
2008	1.7 C (35.1 F)
2009	3.9 C (39.0 F)
2010	1.7 C (35.1 F)
2011	1.7 C (35.1 F)
2012	8.3 C (46.9 F)

Wettest day (Rx1day)

The wettest day of the year at Atoyac, 1943 to 2012. The record is 83.1 mm (3.3 in) in 1972, marked on the chart; the median year is 46.0 mm (1.8 in).

Wettest day (Rx1day) at Atoyac by year
Year	Wettest day (Rx1day)
1943	31.8 mm (1.3 in)
1944	28.2 mm (1.1 in)
1945	41.4 mm (1.6 in)
1946	29.0 mm (1.1 in)
1947	45.5 mm (1.8 in)
1948	34.8 mm (1.4 in)
1949	59.9 mm (2.4 in)
1950	53.8 mm (2.1 in)
1951	31.5 mm (1.2 in)
1952	41.1 mm (1.6 in)
1953	61.0 mm (2.4 in)
1954	41.4 mm (1.6 in)
1955	59.9 mm (2.4 in)
1956	44.2 mm (1.7 in)
1957	30.5 mm (1.2 in)
1958	60.5 mm (2.4 in)
1959	47.8 mm (1.9 in)
1960	67.1 mm (2.6 in)
1961	44.5 mm (1.8 in)
1962	25.7 mm (1.0 in)
1963	43.9 mm (1.7 in)
1964	19.1 mm (0.8 in)
1965	29.5 mm (1.2 in)
1966	55.6 mm (2.2 in)
1967	55.9 mm (2.2 in)
1968	57.2 mm (2.3 in)
1969	48.3 mm (1.9 in)
1970	46.5 mm (1.8 in)
1971	47.0 mm (1.9 in)
1972	83.1 mm (3.3 in)
1973	46.7 mm (1.8 in)
1974	41.9 mm (1.6 in)
1975	35.6 mm (1.4 in)
1976	40.9 mm (1.6 in)
1977	32.3 mm (1.3 in)
1978	52.6 mm (2.1 in)
1979	46.5 mm (1.8 in)
1980	58.2 mm (2.3 in)
1981	64.3 mm (2.5 in)
1982	54.4 mm (2.1 in)
1983	50.0 mm (2.0 in)
1984	38.6 mm (1.5 in)
1985	53.8 mm (2.1 in)
1986	42.7 mm (1.7 in)
1987	63.2 mm (2.5 in)
1988	30.5 mm (1.2 in)
1989	29.0 mm (1.1 in)
1990	27.4 mm (1.1 in)
1991	62.5 mm (2.5 in)
1992	70.9 mm (2.8 in)
1993	69.3 mm (2.7 in)
1994	31.8 mm (1.3 in)
1995	67.8 mm (2.7 in)
1996	32.8 mm (1.3 in)
1997	49.8 mm (2.0 in)
1998	44.5 mm (1.8 in)
1999	25.4 mm (1.0 in)
2000	45.5 mm (1.8 in)
2001	53.8 mm (2.1 in)
2002	40.9 mm (1.6 in)
2003	54.9 mm (2.2 in)
2004	11.2 mm (0.4 in)
2005	31.8 mm (1.3 in)
2006	52.1 mm (2.1 in)
2007	76.2 mm (3.0 in)
2008	47.5 mm (1.9 in)
2009	34.8 mm (1.4 in)
2010	74.4 mm (2.9 in)
2011	60.5 mm (2.4 in)
2012	44.5 mm (1.8 in)

Wettest five days (Rx5day)

The wettest five days of the year at Atoyac, 1943 to 2012. The record is 165.9 mm (6.5 in) in 1981, marked on the chart; the median year is 81.4 mm (3.2 in).

Wettest five days (Rx5day) at Atoyac by year
Year	Wettest five days (Rx5day)
1943	45.3 mm (1.8 in)
1944	55.6 mm (2.2 in)
1945	101.9 mm (4.0 in)
1946	56.9 mm (2.2 in)
1947	72.5 mm (2.9 in)
1948	64.1 mm (2.5 in)
1949	87.5 mm (3.4 in)
1950	101.5 mm (4.0 in)
1951	70.7 mm (2.8 in)
1952	70.6 mm (2.8 in)
1953	76.4 mm (3.0 in)
1954	81.1 mm (3.2 in)
1955	112.5 mm (4.4 in)
1956	76.5 mm (3.0 in)
1957	67.1 mm (2.6 in)
1958	94.9 mm (3.7 in)
1959	80.6 mm (3.2 in)
1960	116.5 mm (4.6 in)
1961	98.8 mm (3.9 in)
1962	76.8 mm (3.0 in)
1963	86.9 mm (3.4 in)
1964	70.6 mm (2.8 in)
1965	73.4 mm (2.9 in)
1966	96.5 mm (3.8 in)
1967	110.0 mm (4.3 in)
1968	149.4 mm (5.9 in)
1969	93.0 mm (3.7 in)
1970	74.3 mm (2.9 in)
1971	61.0 mm (2.4 in)
1972	129.1 mm (5.1 in)
1973	92.9 mm (3.7 in)
1974	75.7 mm (3.0 in)
1975	150.7 mm (5.9 in)
1976	79.0 mm (3.1 in)
1977	81.6 mm (3.2 in)
1978	86.1 mm (3.4 in)
1979	82.3 mm (3.2 in)
1980	145.4 mm (5.7 in)
1981	165.9 mm (6.5 in)
1982	97.6 mm (3.8 in)
1983	76.9 mm (3.0 in)
1984	63.0 mm (2.5 in)
1985	122.6 mm (4.8 in)
1986	125.4 mm (4.9 in)
1987	93.1 mm (3.7 in)
1988	80.0 mm (3.1 in)
1989	63.1 mm (2.5 in)
1990	30.0 mm (1.2 in)
1991	116.3 mm (4.6 in)
1992	136.2 mm (5.4 in)
1993	114.5 mm (4.5 in)
1994	54.1 mm (2.1 in)
1995	107.0 mm (4.2 in)
1996	58.9 mm (2.3 in)
1997	90.7 mm (3.6 in)
1998	80.3 mm (3.2 in)
1999	58.4 mm (2.3 in)
2000	80.8 mm (3.2 in)
2001	62.3 mm (2.5 in)
2002	88.3 mm (3.5 in)
2003	93.8 mm (3.7 in)
2004	13.5 mm (0.5 in)
2005	60.3 mm (2.4 in)
2006	74.2 mm (2.9 in)
2007	89.2 mm (3.5 in)
2008	88.6 mm (3.5 in)
2009	64.0 mm (2.5 in)
2010	131.5 mm (5.2 in)
2011	86.0 mm (3.4 in)
2012	56.2 mm (2.2 in)

Longest dry spell (CDD)

The longest dry spell of the year at Atoyac, 1943 to 2012. The record is 161 days in 1945, marked on the chart; the median year is 88 days.

Longest dry spell (CDD) at Atoyac by year
Year	Longest dry spell (CDD)
1943	39 days
1944	91 days
1945	161 days
1946	86 days
1947	114 days
1948	76 days
1949	73 days
1950	71 days
1951	74 days
1952	54 days
1953	146 days
1954	140 days
1955	123 days
1956	132 days
1957	125 days
1958	83 days
1959	96 days
1960	131 days
1961	84 days
1962	71 days
1963	58 days
1964	78 days
1965	81 days
1966	56 days
1967	69 days
1968	68 days
1969	148 days
1970	99 days
1971	148 days
1972	78 days
1973	62 days
1974	88 days
1975	88 days
1976	91 days
1977	48 days
1978	42 days
1979	98 days
1980	82 days
1981	51 days
1982	141 days
1983	126 days
1984	131 days
1985	84 days
1986	77 days
1987	92 days
1988	99 days
1989	90 days
1990	39 days
1991	81 days
1992	57 days
1993	102 days
1994	125 days
1995	89 days
1996	136 days
1997	50 days
1998	138 days
1999	79 days
2000	130 days
2001	78 days
2002	73 days
2003	108 days
2004	43 days
2005	91 days
2006	120 days
2007	121 days
2008	104 days
2009	67 days
2010	97 days
2011	108 days
2012	11 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

61 years, 1944 to 2011

A day with at least 47.0 mm (1.9 in) of rain is expected about once in 2 years. A day with at least 83.8 mm (3.3 in) of rain is expected about once in 100 years.

Rainfall return levels at Atoyac: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	47.0 mm (1.9 in)
5 years	60.0 mm (2.4 in)
10 years	67.1 mm (2.6 in)
25 years	74.8 mm (2.9 in)
50 years	79.6 mm (3.1 in)
100 years	83.8 mm (3.3 in)	Longer than the 61 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, 61 years of values from 1944 to 2011.

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: 83.1 mm (3.3 in) in 1972; 76.2 mm (3.0 in) in 2007; 74.4 mm (2.9 in) in 2010.

Station Changes

1 suspected

One change was suspected in the annual mean temperature of Atoyac, at 2005. Each is measured against neighbouring stations.

Relative to 5 neighbouring stations, the station's annual mean temperature from 2005 ran 0.7 C (1.3 F) lower than in the years before (likely change).

Suspected changes in the annual mean temperature at Atoyac, against neighbouring stations
Year	Shift (C)	Shift (F)	Strength	Neighbours
2005	-0.7	-1.3	likely	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 Atoyac standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Atoyac 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).