Monclova Weather Records (MXN00004021)

Record envelope, standing records and threshold days for Monclova (MXN00004021), Mexico, with 51 years of record.

Key Facts for Monclova

Monclova (MXN00004021) is a weather station in Mexico at 18.05 latitude and -90.82 longitude, 100 m (328 ft) above sea level.
The station reports from 1961 to 2011, 51 years of record.
1,464 records set at Monclova still stand.
Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
Monclova tied a daily record high maximum temperature of 35.0 C (95.0 F) on 24 December 2011.

About the Station

Location: Mexico, 18.05 latitude, -90.82 longitude.
Elevation: 100 m (328 ft).
Period of record: 1961 to 2011, 51 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 Monclova. 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 Monclova, 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)	6.1 C (43.0 F)	n/a	n/a
Feb	38.3 C (100.9 F)	7.8 C (46.0 F)	n/a	n/a
Mar	41.7 C (107.1 F)	8.9 C (48.0 F)	n/a	n/a
Apr	42.2 C (108.0 F)	10.0 C (50.0 F)	n/a	n/a
May	41.7 C (107.1 F)	13.9 C (57.0 F)	n/a	n/a
Jun	41.7 C (107.1 F)	17.8 C (64.0 F)	n/a	n/a
Jul	39.4 C (102.9 F)	17.8 C (64.0 F)	n/a	n/a
Aug	39.4 C (102.9 F)	17.8 C (64.0 F)	n/a	n/a
Sep	40.0 C (104.0 F)	17.8 C (64.0 F)	n/a	n/a
Oct	38.9 C (102.0 F)	13.9 C (57.0 F)	n/a	n/a
Nov	37.8 C (100.0 F)	10.6 C (51.1 F)	n/a	n/a
Dec	38.9 C (102.0 F)	8.9 C (48.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Monclova still stand. 1998 holds the most, with 126.

Standing records at Monclova by the year they were set
Year set	Standing records
1961	29
1964	20
1965	70
1966	30
1967	47
1968	43
1969	32
1970	44
1971	34
1972	28
1973	27
1974	37
1975	34
1976	5
1977	17
1978	31
1979	14
1980	30
1981	15
1982	10
1983	24
1984	28
1985	15
1986	22
1987	30
1988	21
1989	20
1990	11
1991	13
1992	17
1993	16
1994	11
1995	18
1996	19
1997	80
1998	126
1999	31
2000	41
2001	46
2002	39
2003	53
2004	14
2005	41
2006	30
2007	25
2008	37
2009	21
2010	7
2011	11

All-Time Record Progression

2 new records

2 all-time records were set at Monclova between 28 September 1997 and 2 November 1998. Each dot is a new record.

When Monclova set new all-time records
Date	Kind	Detail
1997-09-28	Record high minimum temperature	Record high minimum temperature 26.7 C (80.1 F)
1998-11-02	Record daily precipitation	Record daily precipitation 300.0 mm (11.8 in)

Wettest Day of Each Month

Nov: 300.0 mm (11.8 in)

The wettest day on record for each calendar month at Monclova. The most was 300.0 mm (11.8 in) on 2 November 1998.

Record daily precipitation for each month at Monclova
Month	Record daily precipitation (mm)	Date
Jan	53.8 mm (2.1 in)	2 January 1969
Feb	74.9 mm (2.9 in)	28 February 1982
Mar	48.8 mm (1.9 in)	30 March 1969
Apr	101.3 mm (4.0 in)	18 April 1985
May	186.9 mm (7.4 in)	29 May 1978
Jun	140.0 mm (5.5 in)	15 June 1989
Jul	124.7 mm (4.9 in)	18 July 1972
Aug	114.8 mm (4.5 in)	14 August 1988
Sep	199.9 mm (7.9 in)	23 September 1975
Oct	223.3 mm (8.8 in)	2 October 1987
Nov	300.0 mm (11.8 in)	2 November 1998
Dec	79.8 mm (3.1 in)	20 December 1977

Period of Record Coverage

1961 to 2011

49 years of record at Monclova, 1961 to 2011. 6 years have data for under 90 percent of days and are left out of rankings: 1961, 1964, 1976, 1977, 1996, 2007.

Days with data per year at Monclova
Year	Days with data	Share of year	Complete
1961	180	49%	No
1964	77	21%	No
1965	365	100%	Yes
1966	365	100%	Yes
1967	355	97%	Yes
1968	365	100%	Yes
1969	361	99%	Yes
1970	365	100%	Yes
1971	364	100%	Yes
1972	366	100%	Yes
1973	334	92%	Yes
1974	365	100%	Yes
1975	334	92%	Yes
1976	30	8%	No
1977	214	59%	No
1978	364	100%	Yes
1979	365	100%	Yes
1980	364	99%	Yes
1981	334	92%	Yes
1982	364	100%	Yes
1983	365	100%	Yes
1984	366	100%	Yes
1985	365	100%	Yes
1986	365	100%	Yes
1987	365	100%	Yes
1988	365	100%	Yes
1989	365	100%	Yes
1990	334	92%	Yes
1991	365	100%	Yes
1992	365	100%	Yes
1993	365	100%	Yes
1994	365	100%	Yes
1995	365	100%	Yes
1996	307	84%	No
1997	365	100%	Yes
1998	365	100%	Yes
1999	365	100%	Yes
2000	366	100%	Yes
2001	364	100%	Yes
2002	364	100%	Yes
2003	364	100%	Yes
2004	366	100%	Yes
2005	365	100%	Yes
2006	365	100%	Yes
2007	303	83%	No
2008	363	99%	Yes
2009	359	98%	Yes
2010	364	100%	Yes
2011	358	98%	Yes

Latest Records

Latest records at Monclova
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
24 December 2011	Monclova, MX	daily high max (Tie)	35.0 C (95.0 F)	tie	1 year	1 of 100 (Routine)
14 December 2011	Monclova, MX	daily high max (Tie)	35.0 C (95.0 F)	tie	24 years	3 of 100 (Routine)
12 December 2011	Monclova, MX	daily high max (Tie)	33.9 C (93.0 F)	tie	16 years	2 of 100 (Routine)
12 November 2011	Monclova, MX	daily high max (Tie)	35.6 C (96.1 F)	tie	33 years	3 of 100 (Routine)
10 November 2011	Monclova, MX	daily high max (Tie)	35.0 C (95.0 F)	tie	36 years	3 of 100 (Routine)
4 November 2011	Monclova, MX	daily high min (Tie)	23.9 C (75.0 F)	tie	12 years	2 of 100 (Routine)
12 October 2011	Monclova, MX	daily rain	36.8 mm (1.4 in)	2.5 mm (0.10 in)	38 years	17 of 100 (Routine)
6 October 2011	Monclova, MX	daily low min (Tie)	18.9 C (66.0 F)	tie	1 year	1 of 100 (Routine)
4 October 2011	Monclova, MX	daily low min (Tie)	18.9 C (66.0 F)	tie	45 years	4 of 100 (Routine)
1 October 2011	Monclova, MX	daily low min	18.9 C (66.0 F)	1.1 C (2.0 F)	44 years	24 of 100 (Routine)
27 September 2011	Monclova, MX	daily low min (Tie)	20.0 C (68.0 F)	tie	45 years	4 of 100 (Routine)
25 September 2011	Monclova, MX	daily low min	18.9 C (66.0 F)	1.1 C (2.0 F)	36 years	22 of 100 (Routine)
24 September 2011	Monclova, MX	daily low min (Tie)	20.0 C (68.0 F)	tie	37 years	4 of 100 (Routine)
21 September 2011	Monclova, MX	daily high max (Tie)	35.6 C (96.1 F)	tie	12 years	2 of 100 (Routine)
14 September 2011	Monclova, MX	daily low min (Tie)	18.9 C (66.0 F)	tie	8 years	1 of 100 (Routine)
13 September 2011	Monclova, MX	daily low min (Tie)	20.0 C (68.0 F)	tie	36 years	4 of 100 (Routine)
3 September 2011	Monclova, MX	daily high max (Tie)	38.9 C (102.0 F)	tie	45 years	4 of 100 (Routine)
1 September 2011	Monclova, MX	daily high max (Tie)	35.6 C (96.1 F)	tie	44 years	4 of 100 (Routine)
31 August 2011	Monclova, MX	daily low min (Tie)	18.9 C (66.0 F)	tie	45 years	4 of 100 (Routine)
27 August 2011	Monclova, MX	daily low min	18.9 C (66.0 F)	1.1 C (2.0 F)	36 years	24 of 100 (Routine)

Climate Trend

37 complete years, 1965 to 2011

One stripe for each of 37 complete years at Monclova, 1965 to 2011. Blue stripes are years cooler than the station's own mean of 26.3 C (79.4 F); red stripes are warmer. The coolest year was 1968, at 25.0 C (76.9 F), and the warmest was 1998, at 28.0 C (82.4 F). The strongest colour marks a difference of 1.7 C (3.1 F).

Annual mean temperature at Monclova as warming stripes, 1965 to 2011
Year	Annual mean temperature	Difference from the station mean
1965	25.9 C	-0.43 C
1966	25.9 C	-0.41 C
1967	25.6 C	-0.75 C
1968	25.0 C	-1.36 C
1969	25.8 C	-0.53 C
1970	25.2 C	-1.11 C
1971	25.7 C	-0.66 C
1972	26.3 C	-0.06 C
1974	25.6 C	-0.71 C
1978	26.2 C	-0.09 C
1979	26.1 C	-0.22 C
1980	26.1 C	-0.25 C
1982	26.3 C	+0.01 C
1983	26.4 C	+0.05 C
1984	25.8 C	-0.54 C
1985	25.9 C	-0.44 C
1986	25.8 C	-0.52 C
1987	25.8 C	-0.51 C
1988	26.1 C	-0.17 C
1989	25.7 C	-0.63 C
1991	26.4 C	+0.10 C
1992	26.0 C	-0.34 C
1993	26.2 C	-0.14 C
1994	26.1 C	-0.19 C
1995	26.3 C	-0.03 C
1997	27.3 C	+1.02 C
1998	28.0 C	+1.69 C
1999	27.6 C	+1.32 C
2000	27.6 C	+1.25 C
2001	27.4 C	+1.09 C
2002	25.4 C	-0.87 C
2003	27.2 C	+0.89 C
2004	27.2 C	+0.88 C
2005	27.3 C	+0.98 C
2006	26.6 C	+0.28 C
2008	26.8 C	+0.52 C
2011	27.3 C	+0.97 C

The annual mean temperature here has risen by 0.4 C (0.3 to 0.5) per decade over 1965 to 2011. In Fahrenheit: 0.7 F (0.5 to 0.9) per decade. The slope is a straight line fitted to 37 complete years; the brackets give its 95 percent interval.

Fitted temperature trends per decade at Monclova
Measure	Per decade (C)	Per decade (F)	Period	Complete years	Reading
Annual mean temperature	0.4 C (0.3 to 0.5) per decade	0.7 F (0.5 to 0.9) per decade	1965 to 2011	37	Rise
Mean daily maximum	0.4 C (0.2 to 0.5) per decade	0.6 F (0.4 to 0.9) per decade	1965 to 2011	37	Rise
Mean daily minimum	0.4 C (0.3 to 0.6) per decade	0.8 F (0.5 to 1.1) per decade	1965 to 2011	37	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

1961 to 2011

Yearly extremes at Monclova: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	42.2 C (108.0 F)	1973	40.0 C (104.0 F)	49
Coldest night (TNn)	6.1 C (43.0 F)	1965	10.6 C (51.1 F)	49
Wettest day (Rx1day)	300.0 mm (11.8 in)	1998	70.9 mm (2.8 in)	49
Wettest five days (Rx5day)	444.1 mm (17.5 in)	1987	143.8 mm (5.7 in)	49
Longest dry spell (CDD)	112 days	1998	38 days	49

Hottest day (TXx)

The hottest day of the year at Monclova, 1961 to 2011. The record is 42.2 C (108.0 F) in 1973, marked on the chart; the median year is 40.0 C (104.0 F).

Hottest day (TXx) at Monclova by year
Year	Hottest day (TXx)
1961	38.9 C (102.0 F)
1964	36.7 C (98.1 F)
1965	41.1 C (106.0 F)
1966	40.0 C (104.0 F)
1967	38.9 C (102.0 F)
1968	39.4 C (102.9 F)
1969	40.0 C (104.0 F)
1970	40.0 C (104.0 F)
1971	41.7 C (107.1 F)
1972	41.1 C (106.0 F)
1973	42.2 C (108.0 F)
1974	41.7 C (107.1 F)
1975	41.7 C (107.1 F)
1976	40.0 C (104.0 F)
1977	36.7 C (98.1 F)
1978	40.6 C (105.1 F)
1979	40.0 C (104.0 F)
1980	40.0 C (104.0 F)
1981	39.4 C (102.9 F)
1982	38.3 C (100.9 F)
1983	40.0 C (104.0 F)
1984	40.6 C (105.1 F)
1985	37.8 C (100.0 F)
1986	38.9 C (102.0 F)
1987	38.9 C (102.0 F)
1988	40.6 C (105.1 F)
1989	37.2 C (99.0 F)
1990	37.8 C (100.0 F)
1991	41.1 C (106.0 F)
1992	38.9 C (102.0 F)
1993	37.8 C (100.0 F)
1994	37.8 C (100.0 F)
1995	40.0 C (104.0 F)
1996	36.7 C (98.1 F)
1997	40.0 C (104.0 F)
1998	40.6 C (105.1 F)
1999	40.6 C (105.1 F)
2000	40.6 C (105.1 F)
2001	38.9 C (102.0 F)
2002	40.0 C (104.0 F)
2003	41.7 C (107.1 F)
2004	40.0 C (104.0 F)
2005	41.7 C (107.1 F)
2006	40.6 C (105.1 F)
2007	40.0 C (104.0 F)
2008	40.6 C (105.1 F)
2009	40.0 C (104.0 F)
2010	40.0 C (104.0 F)
2011	38.9 C (102.0 F)

Coldest night (TNn)

The coldest night of the year at Monclova, 1961 to 2011. The record is 6.1 C (43.0 F) in 1965, marked on the chart; the median year is 10.6 C (51.1 F).

Coldest night (TNn) at Monclova by year
Year	Coldest night (TNn)
1961	7.8 C (46.0 F)
1964	10.6 C (51.1 F)
1965	6.1 C (43.0 F)
1966	10.0 C (50.0 F)
1967	10.0 C (50.0 F)
1968	8.9 C (48.0 F)
1969	11.7 C (53.1 F)
1970	10.0 C (50.0 F)
1971	7.8 C (46.0 F)
1972	10.0 C (50.0 F)
1973	9.4 C (48.9 F)
1974	10.0 C (50.0 F)
1975	10.0 C (50.0 F)
1976	18.9 C (66.0 F)
1977	13.3 C (55.9 F)
1978	10.0 C (50.0 F)
1979	11.1 C (52.0 F)
1980	10.0 C (50.0 F)
1981	10.0 C (50.0 F)
1982	11.1 C (52.0 F)
1983	11.1 C (52.0 F)
1984	11.7 C (53.1 F)
1985	7.8 C (46.0 F)
1986	10.0 C (50.0 F)
1987	10.0 C (50.0 F)
1988	10.6 C (51.1 F)
1989	8.9 C (48.0 F)
1990	12.2 C (54.0 F)
1991	11.7 C (53.1 F)
1992	15.0 C (59.0 F)
1993	11.7 C (53.1 F)
1994	10.0 C (50.0 F)
1995	11.7 C (53.1 F)
1996	10.0 C (50.0 F)
1997	12.8 C (55.0 F)
1998	11.7 C (53.1 F)
1999	13.9 C (57.0 F)
2000	11.7 C (53.1 F)
2001	10.6 C (51.1 F)
2002	10.0 C (50.0 F)
2003	8.9 C (48.0 F)
2004	15.6 C (60.1 F)
2005	15.0 C (59.0 F)
2006	11.7 C (53.1 F)
2007	13.9 C (57.0 F)
2008	15.0 C (59.0 F)
2009	11.7 C (53.1 F)
2010	13.9 C (57.0 F)
2011	13.9 C (57.0 F)

Wettest day (Rx1day)

The wettest day of the year at Monclova, 1961 to 2011. The record is 300.0 mm (11.8 in) in 1998, marked on the chart; the median year is 70.9 mm (2.8 in).

Wettest day (Rx1day) at Monclova by year
Year	Wettest day (Rx1day)
1961	47.8 mm (1.9 in)
1964	66.3 mm (2.6 in)
1965	47.2 mm (1.9 in)
1966	61.7 mm (2.4 in)
1967	59.9 mm (2.4 in)
1968	70.9 mm (2.8 in)
1969	122.9 mm (4.8 in)
1970	61.5 mm (2.4 in)
1971	53.8 mm (2.1 in)
1972	124.7 mm (4.9 in)
1973	124.7 mm (4.9 in)
1974	63.8 mm (2.5 in)
1975	199.9 mm (7.9 in)
1976	30.0 mm (1.2 in)
1977	118.1 mm (4.6 in)
1978	186.9 mm (7.4 in)
1979	114.3 mm (4.5 in)
1980	85.9 mm (3.4 in)
1981	81.5 mm (3.2 in)
1982	90.4 mm (3.6 in)
1983	71.1 mm (2.8 in)
1984	121.4 mm (4.8 in)
1985	101.3 mm (4.0 in)
1986	120.1 mm (4.7 in)
1987	223.3 mm (8.8 in)
1988	152.9 mm (6.0 in)
1989	140.0 mm (5.5 in)
1990	67.3 mm (2.6 in)
1991	52.8 mm (2.1 in)
1992	111.8 mm (4.4 in)
1993	81.8 mm (3.2 in)
1994	53.8 mm (2.1 in)
1995	181.9 mm (7.2 in)
1996	27.2 mm (1.1 in)
1997	24.9 mm (1.0 in)
1998	300.0 mm (11.8 in)
1999	33.8 mm (1.3 in)
2000	23.9 mm (0.9 in)
2001	59.9 mm (2.4 in)
2002	179.8 mm (7.1 in)
2003	26.9 mm (1.1 in)
2004	34.8 mm (1.4 in)
2005	79.8 mm (3.1 in)
2006	53.8 mm (2.1 in)
2007	63.0 mm (2.5 in)
2008	46.0 mm (1.8 in)
2009	25.9 mm (1.0 in)
2010	86.9 mm (3.4 in)
2011	42.9 mm (1.7 in)

Wettest five days (Rx5day)

The wettest five days of the year at Monclova, 1961 to 2011. The record is 444.1 mm (17.5 in) in 1987, marked on the chart; the median year is 143.8 mm (5.7 in).

Wettest five days (Rx5day) at Monclova by year
Year	Wettest five days (Rx5day)
1961	109.3 mm (4.3 in)
1964	71.6 mm (2.8 in)
1965	127.5 mm (5.0 in)
1966	136.7 mm (5.4 in)
1967	79.5 mm (3.1 in)
1968	137.5 mm (5.4 in)
1969	174.2 mm (6.9 in)
1970	126.0 mm (5.0 in)
1971	95.3 mm (3.8 in)
1972	251.7 mm (9.9 in)
1973	200.9 mm (7.9 in)
1974	159.5 mm (6.3 in)
1975	206.5 mm (8.1 in)
1976	58.6 mm (2.3 in)
1977	140.7 mm (5.5 in)
1978	230.6 mm (9.1 in)
1979	171.8 mm (6.8 in)
1980	173.3 mm (6.8 in)
1981	170.9 mm (6.7 in)
1982	155.7 mm (6.1 in)
1983	147.1 mm (5.8 in)
1984	155.7 mm (6.1 in)
1985	143.8 mm (5.7 in)
1986	197.8 mm (7.8 in)
1987	444.1 mm (17.5 in)
1988	232.0 mm (9.1 in)
1989	260.1 mm (10.2 in)
1990	132.6 mm (5.2 in)
1991	120.9 mm (4.8 in)
1992	233.8 mm (9.2 in)
1993	141.5 mm (5.6 in)
1994	144.8 mm (5.7 in)
1995	230.2 mm (9.1 in)
1996	61.7 mm (2.4 in)
1997	78.7 mm (3.1 in)
1998	320.6 mm (12.6 in)
1999	100.3 mm (3.9 in)
2000	77.4 mm (3.0 in)
2001	80.5 mm (3.2 in)
2002	258.3 mm (10.2 in)
2003	95.7 mm (3.8 in)
2004	103.4 mm (4.1 in)
2005	210.2 mm (8.3 in)
2006	101.6 mm (4.0 in)
2007	96.2 mm (3.8 in)
2008	154.4 mm (6.1 in)
2009	61.5 mm (2.4 in)
2010	181.4 mm (7.1 in)
2011	86.5 mm (3.4 in)

Longest dry spell (CDD)

The longest dry spell of the year at Monclova, 1961 to 2011. The record is 112 days in 1998, marked on the chart; the median year is 38 days.

Longest dry spell (CDD) at Monclova by year
Year	Longest dry spell (CDD)
1961	59 days
1964	11 days
1965	43 days
1966	21 days
1967	34 days
1968	20 days
1969	43 days
1970	38 days
1971	60 days
1972	40 days
1973	39 days
1974	32 days
1975	63 days
1976	5 days
1977	13 days
1978	33 days
1979	28 days
1980	42 days
1981	24 days
1982	42 days
1983	42 days
1984	24 days
1985	33 days
1986	44 days
1987	36 days
1988	33 days
1989	24 days
1990	28 days
1991	77 days
1992	42 days
1993	38 days
1994	23 days
1995	45 days
1996	17 days
1997	34 days
1998	112 days
1999	58 days
2000	35 days
2001	61 days
2002	46 days
2003	75 days
2004	37 days
2005	87 days
2006	31 days
2007	53 days
2008	45 days
2009	28 days
2010	22 days
2011	46 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

41 years, 1965 to 2011

A day with at least 79.8 mm (3.1 in) of rain is expected about once in 2 years. A day with at least 333.6 mm (13.1 in) of rain is expected about once in 100 years.

Rainfall return levels at Monclova: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	79.8 mm (3.1 in)
5 years	133.0 mm (5.2 in)
10 years	173.4 mm (6.8 in)
25 years	231.4 mm (9.1 in)
50 years	280.0 mm (11.0 in)	Longer than the 41 years of record
100 years	333.6 mm (13.1 in)	Longer than the 41 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, 41 years of values from 1965 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: 300.0 mm (11.8 in) in 1998; 223.3 mm (8.8 in) in 1987; 199.9 mm (7.9 in) in 1975.

Download the Data

Data for Monclova standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Monclova 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 2026-10-13 (13 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).