El Grullo Weather Records (MXN00014050)

Record envelope, standing records and threshold days for El Grullo (MXN00014050), Mexico, with 53 years of record.

Key Facts for El Grullo

El Grullo (MXN00014050) is a weather station in Mexico at 19.85 latitude and -104.28 longitude, 905 m (2,969 ft) above sea level.
The station reports from 1939 to 1991, 53 years of record.
1,464 records set at El Grullo still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
El Grullo set a daily record low minimum temperature of 14.4 C (57.9 F) on 1 June 1991.

About the Station

Location: Mexico, 19.85 latitude, -104.28 longitude.
Elevation: 905 m (2,969 ft).
Period of record: 1939 to 1991, 53 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 El Grullo. 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 El Grullo, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	39.4 C (102.9 F)	0.0 C (32.0 F)	n/a	n/a
Feb	40.6 C (105.1 F)	2.8 C (37.0 F)	n/a	n/a
Mar	42.8 C (109.0 F)	6.7 C (44.1 F)	n/a	n/a
Apr	42.8 C (109.0 F)	6.7 C (44.1 F)	n/a	n/a
May	44.4 C (111.9 F)	8.9 C (48.0 F)	n/a	n/a
Jun	42.8 C (109.0 F)	13.9 C (57.0 F)	n/a	n/a
Jul	43.9 C (111.0 F)	14.4 C (57.9 F)	n/a	n/a
Aug	39.4 C (102.9 F)	13.9 C (57.0 F)	n/a	n/a
Sep	38.9 C (102.0 F)	12.8 C (55.0 F)	n/a	n/a
Oct	40.6 C (105.1 F)	8.3 C (46.9 F)	n/a	n/a
Nov	38.9 C (102.0 F)	7.2 C (45.0 F)	n/a	n/a
Dec	37.8 C (100.0 F)	3.3 C (37.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at El Grullo still stand. 1939 holds the most, with 166.

Standing records at El Grullo by the year they were set
Year set	Standing records
1939	166
1940	120
1941	88
1942	24
1943	85
1947	20
1948	20
1949	18
1950	19
1951	40
1952	49
1953	35
1954	19
1955	34
1956	22
1957	46
1958	24
1959	29
1960	30
1961	29
1962	21
1963	11
1964	20
1965	20
1966	18
1967	14
1968	25
1969	33
1970	19
1971	28
1972	20
1973	24
1974	16
1975	16
1976	24
1977	23
1978	20
1979	19
1980	16
1981	26
1982	22
1983	31
1984	16
1985	13
1986	27
1987	20
1991	5

All-Time Record Progression

3 new records

3 all-time records were set at El Grullo between 16 June 1978 and 18 January 1981. Each dot is a new record.

When El Grullo set new all-time records
Date	Kind	Detail
1978-06-16	Record high minimum temperature	Record high minimum temperature 24.4 C (75.9 F)
1978-06-17	Record high minimum temperature	Record high minimum temperature 25.0 C (77.0 F)
1981-01-18	Record low maximum temperature	Record low maximum temperature 15.0 C (59.0 F)

Wettest Day of Each Month

Mar: 97.8 mm (3.9 in)

The wettest day on record for each calendar month at El Grullo. The most was 97.8 mm (3.9 in) on 4 March 1968.

Record daily precipitation for each month at El Grullo
Month	Record daily precipitation (mm)	Date
Jan	85.9 mm (3.4 in)	12 January 1967
Feb	37.3 mm (1.5 in)	4 February 1941
Mar	97.8 mm (3.9 in)	4 March 1968
Apr	53.1 mm (2.1 in)	15 April 1959
May	59.9 mm (2.4 in)	26 May 1983
Jun	72.6 mm (2.9 in)	27 June 1969
Jul	77.5 mm (3.1 in)	1 July 1968
Aug	87.4 mm (3.4 in)	31 August 1971
Sep	83.3 mm (3.3 in)	5 September 1944
Oct	97.8 mm (3.9 in)	3 October 1969
Nov	88.4 mm (3.5 in)	26 November 1982
Dec	60.5 mm (2.4 in)	12 December 1960

Period of Record Coverage

1939 to 1991

47 years of record at El Grullo, 1939 to 1991. 12 years have data for under 90 percent of days and are left out of rankings: 1939, 1940, 1942, 1943, 1947, 1948, 1949, 1950 and others.

Days with data per year at El Grullo
Year	Days with data	Share of year	Complete
1939	298	82%	No
1940	206	56%	No
1941	357	98%	Yes
1942	151	41%	No
1943	169	46%	No
1947	235	64%	No
1948	314	86%	No
1949	309	85%	No
1950	327	90%	No
1951	359	98%	Yes
1952	362	99%	Yes
1953	331	91%	Yes
1954	365	100%	Yes
1955	365	100%	Yes
1956	365	100%	Yes
1957	362	99%	Yes
1958	364	100%	Yes
1959	364	100%	Yes
1960	355	97%	Yes
1961	365	100%	Yes
1962	365	100%	Yes
1963	334	92%	Yes
1964	335	92%	Yes
1965	365	100%	Yes
1966	365	100%	Yes
1967	365	100%	Yes
1968	337	92%	Yes
1969	331	91%	Yes
1970	365	100%	Yes
1971	364	100%	Yes
1972	364	99%	Yes
1973	365	100%	Yes
1974	365	100%	Yes
1975	365	100%	Yes
1976	365	100%	Yes
1977	363	99%	Yes
1978	365	100%	Yes
1979	182	50%	No
1980	366	100%	Yes
1981	364	100%	Yes
1982	364	100%	Yes
1983	354	97%	Yes
1984	332	91%	Yes
1985	365	100%	Yes
1986	324	89%	No
1987	304	83%	No
1991	181	50%	No

Latest Records

Latest records at El Grullo
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
1 June 1991	El Grullo, MX	daily low min	14.4 C (57.9 F)	0.6 C (1.1 F)	24 years	16 of 100 (Routine)
31 May 1991	El Grullo, MX	daily low min	14.4 C (57.9 F)	0.6 C (1.1 F)	24 years	14 of 100 (Routine)
24 May 1991	El Grullo, MX	daily low min	13.3 C (55.9 F)	1.1 C (2.0 F)	26 years	17 of 100 (Routine)
19 April 1991	El Grullo, MX	daily high max (Tie)	40.0 C (104.0 F)	tie	52 years	5 of 100 (Routine)
11 February 1991	El Grullo, MX	daily high min (Tie)	15.6 C (60.1 F)	tie	12 years	2 of 100 (Routine)
10 February 1991	El Grullo, MX	daily high min (Tie)	15.6 C (60.1 F)	tie	40 years	4 of 100 (Routine)
9 February 1991	El Grullo, MX	daily high min	16.7 C (62.1 F)	1.1 C (2.0 F)	43 years	21 of 100 (Routine)
8 February 1991	El Grullo, MX	daily high min	18.3 C (64.9 F)	3.3 C (5.9 F)	33 years	29 of 100 (Routine)
7 February 1991	El Grullo, MX	daily high min (Tie)	16.1 C (61.0 F)	tie	31 years	3 of 100 (Routine)
29 October 1987	El Grullo, MX	daily high max (Tie)	35.0 C (95.0 F)	tie	48 years	4 of 100 (Routine)
28 October 1987	El Grullo, MX	daily high max (Tie)	35.0 C (95.0 F)	tie	2 years	1 of 100 (Routine)
14 October 1987	El Grullo, MX	daily low min (Tie)	15.0 C (59.0 F)	tie	8 years	1 of 100 (Routine)
30 September 1987	El Grullo, MX	daily rain	41.9 mm (1.6 in)	2.0 mm (0.08 in)	0 years	5 of 100 (Routine)
21 September 1987	El Grullo, MX	daily low min (Tie)	17.8 C (64.0 F)	tie	40 years	4 of 100 (Routine)
10 September 1987	El Grullo, MX	daily high max (Tie)	33.9 C (93.0 F)	tie	12 years	1 of 100 (Routine)
9 September 1987	El Grullo, MX	daily high max	35.0 C (95.0 F)	0.6 C (1.1 F)	25 years	13 of 100 (Routine)
8 September 1987	El Grullo, MX	daily high max (Tie)	35.0 C (95.0 F)	tie	12 years	1 of 100 (Routine)
23 August 1987	El Grullo, MX	daily rain	42.9 mm (1.7 in)	18.0 mm (0.7 in)	12 years	23 of 100 (Routine)
16 August 1987	El Grullo, MX	daily low min (Tie)	17.8 C (64.0 F)	tie	34 years	3 of 100 (Routine)
2 August 1987	El Grullo, MX	daily high min (Tie)	20.6 C (69.1 F)	tie	21 years	2 of 100 (Routine)

Climate Trend

31 complete years, 1941 to 1985

One stripe for each of 31 complete years at El Grullo, 1941 to 1985. Blue stripes are years cooler than the station's own mean of 23.8 C (74.8 F); red stripes are warmer. The coolest year was 1971, at 23.0 C (73.4 F), and the warmest was 1941, at 24.9 C (76.7 F). The strongest colour marks a difference of 1.1 C (2.0 F).

Annual mean temperature at El Grullo as warming stripes, 1941 to 1985
Year	Annual mean temperature	Difference from the station mean
1941	24.9 C	+1.08 C
1948	23.9 C	+0.17 C
1949	23.8 C	+0.03 C
1950	23.7 C	-0.04 C
1951	24.2 C	+0.39 C
1952	23.9 C	+0.14 C
1954	24.1 C	+0.28 C
1955	23.6 C	-0.18 C
1956	24.0 C	+0.27 C
1957	24.3 C	+0.49 C
1958	23.4 C	-0.34 C
1959	23.4 C	-0.33 C
1961	23.3 C	-0.49 C
1962	23.4 C	-0.40 C
1965	23.7 C	-0.05 C
1966	23.4 C	-0.42 C
1967	23.3 C	-0.50 C
1970	23.7 C	-0.12 C
1971	23.0 C	-0.76 C
1972	23.9 C	+0.12 C
1973	23.6 C	-0.20 C
1974	23.9 C	+0.08 C
1975	23.6 C	-0.18 C
1976	23.7 C	-0.10 C
1977	24.4 C	+0.62 C
1978	23.8 C	+0.04 C
1980	24.3 C	+0.55 C
1981	23.9 C	+0.08 C
1982	24.6 C	+0.86 C
1983	23.2 C	-0.57 C
1985	23.3 C	-0.43 C

The fitted trend in annual mean temperature here over 1941 to 1985 is -0.1 C (-0.2 to 0.1) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: -0.1 F (-0.4 to 0.1) per decade. The slope is a straight line fitted to 31 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at El Grullo
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	-0.1 C (-0.2 to 0.1) per decade	-0.1 F (-0.4 to 0.1) per decade	1941 to 1985	31	Not clearly different from zero
Mean daily maximum	-0.17 C (-0.35 to 0.01) per decade	-0.31 F (-0.64 to 0.01) per decade	1941 to 1985	31	Not clearly different from zero
Mean daily minimum	0.03 C (-0.12 to 0.18) per decade	0.1 F (-0.2 to 0.3) per decade	1941 to 1985	31	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 1991

Yearly extremes at El Grullo: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	44.4 C (111.9 F)	1940	38.3 C (100.9 F)	47
Coldest night (TNn)	0.0 C (32.0 F)	1951	5.6 C (42.1 F)	47
Wettest day (Rx1day)	97.8 mm (3.9 in)	1968	56.9 mm (2.2 in)	49
Wettest five days (Rx5day)	175.5 mm (6.9 in)	1970	101.5 mm (4.0 in)	49
Longest dry spell (CDD)	167 days	1957	87 days	49

Hottest day (TXx)

The hottest day of the year at El Grullo, 1939 to 1991. The record is 44.4 C (111.9 F) in 1940, marked on the chart; the median year is 38.3 C (100.9 F).

Hottest day (TXx) at El Grullo by year
Year	Hottest day (TXx)
1939	42.8 C (109.0 F)
1940	44.4 C (111.9 F)
1941	40.6 C (105.1 F)
1942	41.7 C (107.1 F)
1943	33.3 C (91.9 F)
1944	n/a
1945	n/a
1947	36.1 C (97.0 F)
1948	36.7 C (98.1 F)
1949	37.8 C (100.0 F)
1950	36.7 C (98.1 F)
1951	39.4 C (102.9 F)
1952	40.6 C (105.1 F)
1953	38.3 C (100.9 F)
1954	39.4 C (102.9 F)
1955	38.9 C (102.0 F)
1956	38.9 C (102.0 F)
1957	42.8 C (109.0 F)
1958	37.8 C (100.0 F)
1959	36.7 C (98.1 F)
1960	38.9 C (102.0 F)
1961	38.3 C (100.9 F)
1962	37.8 C (100.0 F)
1963	37.8 C (100.0 F)
1964	38.3 C (100.9 F)
1965	38.9 C (102.0 F)
1966	37.8 C (100.0 F)
1967	37.2 C (99.0 F)
1968	37.8 C (100.0 F)
1969	38.9 C (102.0 F)
1970	39.4 C (102.9 F)
1971	37.8 C (100.0 F)
1972	40.0 C (104.0 F)
1973	38.3 C (100.9 F)
1974	38.3 C (100.9 F)
1975	37.8 C (100.0 F)
1976	37.8 C (100.0 F)
1977	38.9 C (102.0 F)
1978	39.4 C (102.9 F)
1979	36.7 C (98.1 F)
1980	39.4 C (102.9 F)
1981	39.4 C (102.9 F)
1982	38.9 C (102.0 F)
1983	37.8 C (100.0 F)
1984	37.8 C (100.0 F)
1985	38.3 C (100.9 F)
1986	39.4 C (102.9 F)
1987	40.0 C (104.0 F)
1991	40.0 C (104.0 F)

Coldest night (TNn)

The coldest night of the year at El Grullo, 1939 to 1991. The record is 0.0 C (32.0 F) in 1951, marked on the chart; the median year is 5.6 C (42.1 F).

Coldest night (TNn) at El Grullo by year
Year	Coldest night (TNn)
1939	5.0 C (41.0 F)
1940	5.0 C (41.0 F)
1941	5.6 C (42.1 F)
1942	7.8 C (46.0 F)
1943	11.7 C (53.1 F)
1944	n/a
1945	n/a
1947	8.3 C (46.9 F)
1948	6.7 C (44.1 F)
1949	6.7 C (44.1 F)
1950	7.2 C (45.0 F)
1951	0.0 C (32.0 F)
1952	6.1 C (43.0 F)
1953	3.3 C (37.9 F)
1954	4.4 C (39.9 F)
1955	2.2 C (36.0 F)
1956	5.6 C (42.1 F)
1957	7.8 C (46.0 F)
1958	7.8 C (46.0 F)
1959	5.0 C (41.0 F)
1960	2.8 C (37.0 F)
1961	6.7 C (44.1 F)
1962	5.6 C (42.1 F)
1963	3.3 C (37.9 F)
1964	5.6 C (42.1 F)
1965	6.7 C (44.1 F)
1966	5.0 C (41.0 F)
1967	4.4 C (39.9 F)
1968	5.6 C (42.1 F)
1969	7.8 C (46.0 F)
1970	6.7 C (44.1 F)
1971	5.6 C (42.1 F)
1972	6.1 C (43.0 F)
1973	5.6 C (42.1 F)
1974	8.9 C (48.0 F)
1975	5.0 C (41.0 F)
1976	5.0 C (41.0 F)
1977	8.9 C (48.0 F)
1978	5.6 C (42.1 F)
1979	5.0 C (41.0 F)
1980	7.8 C (46.0 F)
1981	7.8 C (46.0 F)
1982	8.9 C (48.0 F)
1983	6.7 C (44.1 F)
1984	8.9 C (48.0 F)
1985	6.7 C (44.1 F)
1986	5.0 C (41.0 F)
1987	5.0 C (41.0 F)
1991	7.8 C (46.0 F)

Wettest day (Rx1day)

The wettest day of the year at El Grullo, 1939 to 1991. The record is 97.8 mm (3.9 in) in 1968, marked on the chart; the median year is 56.9 mm (2.2 in).

Wettest day (Rx1day) at El Grullo by year
Year	Wettest day (Rx1day)
1939	67.3 mm (2.6 in)
1940	39.9 mm (1.6 in)
1941	54.9 mm (2.2 in)
1942	38.4 mm (1.5 in)
1943	78.5 mm (3.1 in)
1944	83.3 mm (3.3 in)
1945	51.8 mm (2.0 in)
1947	61.5 mm (2.4 in)
1948	56.1 mm (2.2 in)
1949	61.0 mm (2.4 in)
1950	48.3 mm (1.9 in)
1951	55.9 mm (2.2 in)
1952	59.9 mm (2.4 in)
1953	65.5 mm (2.6 in)
1954	59.9 mm (2.4 in)
1955	39.9 mm (1.6 in)
1956	47.8 mm (1.9 in)
1957	56.9 mm (2.2 in)
1958	54.1 mm (2.1 in)
1959	64.8 mm (2.6 in)
1960	60.5 mm (2.4 in)
1961	81.0 mm (3.2 in)
1962	61.0 mm (2.4 in)
1963	65.8 mm (2.6 in)
1964	48.3 mm (1.9 in)
1965	62.7 mm (2.5 in)
1966	54.1 mm (2.1 in)
1967	85.9 mm (3.4 in)
1968	97.8 mm (3.9 in)
1969	97.8 mm (3.9 in)
1970	77.0 mm (3.0 in)
1971	87.4 mm (3.4 in)
1972	71.9 mm (2.8 in)
1973	54.1 mm (2.1 in)
1974	41.1 mm (1.6 in)
1975	46.0 mm (1.8 in)
1976	80.0 mm (3.1 in)
1977	36.3 mm (1.4 in)
1978	35.3 mm (1.4 in)
1979	8.6 mm (0.34 in)
1980	54.4 mm (2.1 in)
1981	69.1 mm (2.7 in)
1982	88.4 mm (3.5 in)
1983	59.9 mm (2.4 in)
1984	47.0 mm (1.9 in)
1985	50.8 mm (2.0 in)
1986	51.6 mm (2.0 in)
1987	42.9 mm (1.7 in)
1991	34.8 mm (1.4 in)

Wettest five days (Rx5day)

The wettest five days of the year at El Grullo, 1939 to 1991. The record is 175.5 mm (6.9 in) in 1970, marked on the chart; the median year is 101.5 mm (4.0 in).

Wettest five days (Rx5day) at El Grullo by year
Year	Wettest five days (Rx5day)
1939	120.1 mm (4.7 in)
1940	69.2 mm (2.7 in)
1941	91.5 mm (3.6 in)
1942	75.5 mm (3.0 in)
1943	113.8 mm (4.5 in)
1944	152.2 mm (6.0 in)
1945	87.6 mm (3.4 in)
1947	118.4 mm (4.7 in)
1948	108.2 mm (4.3 in)
1949	98.1 mm (3.9 in)
1950	71.4 mm (2.8 in)
1951	87.2 mm (3.4 in)
1952	95.3 mm (3.8 in)
1953	88.9 mm (3.5 in)
1954	122.1 mm (4.8 in)
1955	84.4 mm (3.3 in)
1956	88.7 mm (3.5 in)
1957	122.3 mm (4.8 in)
1958	106.2 mm (4.2 in)
1959	121.4 mm (4.8 in)
1960	125.7 mm (4.9 in)
1961	94.0 mm (3.7 in)
1962	152.5 mm (6.0 in)
1963	116.8 mm (4.6 in)
1964	54.1 mm (2.1 in)
1965	92.7 mm (3.6 in)
1966	113.8 mm (4.5 in)
1967	130.9 mm (5.2 in)
1968	145.4 mm (5.7 in)
1969	132.1 mm (5.2 in)
1970	175.5 mm (6.9 in)
1971	115.5 mm (4.5 in)
1972	108.3 mm (4.3 in)
1973	99.9 mm (3.9 in)
1974	69.4 mm (2.7 in)
1975	91.3 mm (3.6 in)
1976	119.9 mm (4.7 in)
1977	66.3 mm (2.6 in)
1978	87.6 mm (3.4 in)
1979	8.6 mm (0.34 in)
1980	109.5 mm (4.3 in)
1981	111.8 mm (4.4 in)
1982	131.1 mm (5.2 in)
1983	101.5 mm (4.0 in)
1984	58.2 mm (2.3 in)
1985	53.9 mm (2.1 in)
1986	107.4 mm (4.2 in)
1987	67.6 mm (2.7 in)
1991	68.9 mm (2.7 in)

Longest dry spell (CDD)

The longest dry spell of the year at El Grullo, 1939 to 1991. The record is 167 days in 1957, marked on the chart; the median year is 87 days.

Longest dry spell (CDD) at El Grullo by year
Year	Longest dry spell (CDD)
1939	110 days
1940	78 days
1941	80 days
1942	93 days
1943	59 days
1944	54 days
1945	155 days
1947	73 days
1948	76 days
1949	162 days
1950	137 days
1951	90 days
1952	51 days
1953	63 days
1954	87 days
1955	134 days
1956	94 days
1957	167 days
1958	73 days
1959	88 days
1960	104 days
1961	134 days
1962	105 days
1963	59 days
1964	152 days
1965	70 days
1966	50 days
1967	123 days
1968	83 days
1969	147 days
1970	155 days
1971	76 days
1972	38 days
1973	85 days
1974	80 days
1975	134 days
1976	137 days
1977	56 days
1978	78 days
1979	109 days
1980	111 days
1981	100 days
1982	64 days
1983	71 days
1984	109 days
1985	133 days
1986	85 days
1987	79 days
1991	32 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

43 years, 1941 to 1986

A day with at least 59.6 mm (2.3 in) of rain is expected about once in 2 years. A day with at least 110.8 mm (4.4 in) of rain is expected about once in 100 years.

Rainfall return levels at El Grullo: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	59.6 mm (2.3 in)
5 years	74.1 mm (2.9 in)
10 years	83.3 mm (3.3 in)
25 years	94.7 mm (3.7 in)
50 years	102.9 mm (4.1 in)	Longer than the 43 years of record
100 years	110.8 mm (4.4 in)	Longer than the 43 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, 43 years of values from 1941 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: 97.8 mm (3.9 in) in 1968; 97.8 mm (3.9 in) in 1969; 88.4 mm (3.5 in) in 1982.

Download the Data

Data for El Grullo standing records by year: CSV or JSON. Field meanings are on the data page.
Data for El Grullo 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).