Chemax Weather Records (MXN00031069)

Record envelope, standing records and threshold days for Chemax (MXN00031069), Mexico, with 30 years of record.

Key Facts for Chemax

Chemax (MXN00031069) is a weather station in Mexico at 20.63 latitude and -87.93 longitude, 26 m (85 ft) above sea level.
The station reports from 1978 to 2007, 30 years of record.
1,464 records set at Chemax still stand.
Records are tracked for prcp: an element needs 30 years of data to be eligible.

About the Station

Location: Mexico, 20.63 latitude, -87.93 longitude.
Elevation: 26 m (85 ft).
Period of record: 1978 to 2007, 30 years.
Eligible elements: 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 Chemax. 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 Chemax, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	41.1 C (106.0 F)	5.6 C (42.1 F)	n/a	n/a
Feb	40.0 C (104.0 F)	5.6 C (42.1 F)	n/a	n/a
Mar	40.6 C (105.1 F)	4.4 C (39.9 F)	n/a	n/a
Apr	43.9 C (111.0 F)	8.3 C (46.9 F)	n/a	n/a
May	41.7 C (107.1 F)	11.1 C (52.0 F)	n/a	n/a
Jun	42.2 C (108.0 F)	16.7 C (62.1 F)	n/a	n/a
Jul	40.0 C (104.0 F)	15.0 C (59.0 F)	n/a	n/a
Aug	41.7 C (107.1 F)	12.8 C (55.0 F)	n/a	n/a
Sep	38.3 C (100.9 F)	15.6 C (60.1 F)	n/a	n/a
Oct	39.4 C (102.9 F)	10.0 C (50.0 F)	n/a	n/a
Nov	39.4 C (102.9 F)	6.7 C (44.1 F)	n/a	n/a
Dec	40.0 C (104.0 F)	6.7 C (44.1 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Chemax still stand. 1998 holds the most, with 186.

Standing records at Chemax by the year they were set
Year set	Standing records
1978	47
1979	80
1980	101
1981	31
1982	13
1983	83
1984	57
1985	87
1986	60
1987	40
1988	12
1989	19
1990	17
1991	14
1992	82
1993	22
1994	20
1995	32
1996	29
1997	64
1998	186
1999	46
2000	19
2001	33
2002	40
2003	52
2004	44
2005	90
2006	29
2007	15

Wettest Day of Each Month

Jun: 129.8 mm (5.1 in)

The wettest day on record for each calendar month at Chemax. The most was 129.8 mm (5.1 in) on 16 June 1982.

Record daily precipitation for each month at Chemax
Month	Record daily precipitation (mm)	Date
Jan	52.8 mm (2.1 in)	19 January 1994
Feb	94.7 mm (3.7 in)	4 February 2001
Mar	87.9 mm (3.5 in)	23 March 2006
Apr	88.4 mm (3.5 in)	29 April 2001
May	70.1 mm (2.8 in)	30 May 1982
Jun	129.8 mm (5.1 in)	16 June 1982
Jul	90.4 mm (3.6 in)	30 July 1984
Aug	97.0 mm (3.8 in)	30 August 1984
Sep	73.7 mm (2.9 in)	23 September 2002
Oct	71.1 mm (2.8 in)	1 October 1999
Nov	64.8 mm (2.6 in)	22 November 2007
Dec	90.2 mm (3.6 in)	6 December 2005

Period of Record Coverage

1978 to 2007

30 years of record at Chemax, 1978 to 2007. 8 years have data for under 90 percent of days and are left out of rankings: 1978, 1981, 1982, 1989, 1990, 1991, 2006, 2007.

Days with data per year at Chemax
Year	Days with data	Share of year	Complete
1978	275	75%	No
1979	365	100%	Yes
1980	366	100%	Yes
1981	243	67%	No
1982	122	33%	No
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	242	66%	No
1990	304	83%	No
1991	244	67%	No
1992	364	99%	Yes
1993	364	100%	Yes
1994	364	100%	Yes
1995	365	100%	Yes
1996	366	100%	Yes
1997	365	100%	Yes
1998	365	100%	Yes
1999	365	100%	Yes
2000	366	100%	Yes
2001	351	96%	Yes
2002	330	90%	Yes
2003	345	95%	Yes
2004	342	93%	Yes
2005	351	96%	Yes
2006	321	88%	No
2007	293	80%	No

Latest Records

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

Climate Trend

21 complete years, 1979 to 2005

One stripe for each of 21 complete years at Chemax, 1979 to 2005. Blue stripes are years cooler than the station's own mean of 26.0 C (78.8 F); red stripes are warmer. The coolest year was 1985, at 25.3 C (77.5 F), and the warmest was 1998, at 28.2 C (82.7 F). The strongest colour marks a difference of 2.2 C (4.0 F).

Annual mean temperature at Chemax as warming stripes, 1979 to 2005
Year	Annual mean temperature	Difference from the station mean
1979	25.8 C	-0.19 C
1980	25.7 C	-0.32 C
1983	26.3 C	+0.27 C
1984	25.7 C	-0.28 C
1985	25.3 C	-0.75 C
1986	26.0 C	+0.03 C
1987	26.0 C	+0.02 C
1988	26.0 C	0.00 C
1992	25.4 C	-0.60 C
1993	26.2 C	+0.24 C
1994	26.3 C	+0.30 C
1995	26.3 C	+0.25 C
1996	25.9 C	-0.11 C
1998	28.2 C	+2.17 C
1999	26.5 C	+0.52 C
2000	26.1 C	+0.06 C
2001	26.1 C	+0.05 C
2002	25.8 C	-0.17 C
2003	26.0 C	-0.02 C
2004	25.3 C	-0.72 C
2005	25.3 C	-0.66 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

1978 to 2007

Yearly extremes at Chemax: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	43.9 C (111.0 F)	1984	40.0 C (104.0 F)	30
Coldest night (TNn)	4.4 C (39.9 F)	1986	8.9 C (48.0 F)	30
Wettest day (Rx1day)	129.8 mm (5.1 in)	1982	61.8 mm (2.4 in)	30
Wettest five days (Rx5day)	203.9 mm (8.0 in)	1982	115.8 mm (4.6 in)	30
Longest dry spell (CDD)	88 days	1980	35 days	30

Hottest day (TXx)

The hottest day of the year at Chemax, 1978 to 2007. The record is 43.9 C (111.0 F) in 1984, marked on the chart; the median year is 40.0 C (104.0 F).

Hottest day (TXx) at Chemax by year
Year	Hottest day (TXx)
1978	40.0 C (104.0 F)
1979	40.0 C (104.0 F)
1980	40.6 C (105.1 F)
1981	40.0 C (104.0 F)
1982	36.7 C (98.1 F)
1983	41.7 C (107.1 F)
1984	43.9 C (111.0 F)
1985	41.7 C (107.1 F)
1986	39.4 C (102.9 F)
1987	41.7 C (107.1 F)
1988	40.6 C (105.1 F)
1989	38.9 C (102.0 F)
1990	38.9 C (102.0 F)
1991	40.0 C (104.0 F)
1992	41.1 C (106.0 F)
1993	40.6 C (105.1 F)
1994	41.1 C (106.0 F)
1995	41.7 C (107.1 F)
1996	38.3 C (100.9 F)
1997	39.4 C (102.9 F)
1998	42.2 C (108.0 F)
1999	41.1 C (106.0 F)
2000	38.3 C (100.9 F)
2001	40.0 C (104.0 F)
2002	37.8 C (100.0 F)
2003	38.9 C (102.0 F)
2004	38.9 C (102.0 F)
2005	38.9 C (102.0 F)
2006	37.8 C (100.0 F)
2007	40.0 C (104.0 F)

Coldest night (TNn)

The coldest night of the year at Chemax, 1978 to 2007. The record is 4.4 C (39.9 F) in 1986, marked on the chart; the median year is 8.9 C (48.0 F).

Coldest night (TNn) at Chemax by year
Year	Coldest night (TNn)
1978	10.0 C (50.0 F)
1979	8.9 C (48.0 F)
1980	8.9 C (48.0 F)
1981	6.7 C (44.1 F)
1982	12.8 C (55.0 F)
1983	8.9 C (48.0 F)
1984	5.6 C (42.1 F)
1985	6.7 C (44.1 F)
1986	4.4 C (39.9 F)
1987	10.6 C (51.1 F)
1988	8.9 C (48.0 F)
1989	15.0 C (59.0 F)
1990	12.8 C (55.0 F)
1991	6.7 C (44.1 F)
1992	6.7 C (44.1 F)
1993	10.0 C (50.0 F)
1994	6.7 C (44.1 F)
1995	7.8 C (46.0 F)
1996	7.2 C (45.0 F)
1997	10.0 C (50.0 F)
1998	10.0 C (50.0 F)
1999	9.4 C (48.9 F)
2000	9.4 C (48.9 F)
2001	10.0 C (50.0 F)
2002	8.9 C (48.0 F)
2003	8.9 C (48.0 F)
2004	7.8 C (46.0 F)
2005	5.6 C (42.1 F)
2006	10.0 C (50.0 F)
2007	10.0 C (50.0 F)

Wettest day (Rx1day)

The wettest day of the year at Chemax, 1978 to 2007. The record is 129.8 mm (5.1 in) in 1982, marked on the chart; the median year is 61.8 mm (2.4 in).

Wettest day (Rx1day) at Chemax by year
Year	Wettest day (Rx1day)
1978	57.9 mm (2.3 in)
1979	27.2 mm (1.1 in)
1980	45.2 mm (1.8 in)
1981	55.9 mm (2.2 in)
1982	129.8 mm (5.1 in)
1983	105.4 mm (4.1 in)
1984	97.0 mm (3.8 in)
1985	60.5 mm (2.4 in)
1986	49.8 mm (2.0 in)
1987	49.8 mm (2.0 in)
1988	20.8 mm (0.8 in)
1989	28.2 mm (1.1 in)
1990	29.0 mm (1.1 in)
1991	40.6 mm (1.6 in)
1992	68.8 mm (2.7 in)
1993	50.8 mm (2.0 in)
1994	59.9 mm (2.4 in)
1995	95.8 mm (3.8 in)
1996	71.4 mm (2.8 in)
1997	74.9 mm (2.9 in)
1998	72.1 mm (2.8 in)
1999	71.1 mm (2.8 in)
2000	47.0 mm (1.9 in)
2001	94.7 mm (3.7 in)
2002	88.9 mm (3.5 in)
2003	63.0 mm (2.5 in)
2004	52.8 mm (2.1 in)
2005	90.2 mm (3.6 in)
2006	87.9 mm (3.5 in)
2007	79.8 mm (3.1 in)

Wettest five days (Rx5day)

The wettest five days of the year at Chemax, 1978 to 2007. The record is 203.9 mm (8.0 in) in 1982, marked on the chart; the median year is 115.8 mm (4.6 in).

Wettest five days (Rx5day) at Chemax by year
Year	Wettest five days (Rx5day)
1978	97.9 mm (3.9 in)
1979	61.5 mm (2.4 in)
1980	107.2 mm (4.2 in)
1981	117.4 mm (4.6 in)
1982	203.9 mm (8.0 in)
1983	128.5 mm (5.1 in)
1984	169.4 mm (6.7 in)
1985	129.5 mm (5.1 in)
1986	56.6 mm (2.2 in)
1987	144.3 mm (5.7 in)
1988	56.7 mm (2.2 in)
1989	53.6 mm (2.1 in)
1990	48.2 mm (1.9 in)
1991	117.1 mm (4.6 in)
1992	149.2 mm (5.9 in)
1993	158.3 mm (6.2 in)
1994	114.5 mm (4.5 in)
1995	177.4 mm (7.0 in)
1996	111.3 mm (4.4 in)
1997	95.8 mm (3.8 in)
1998	138.4 mm (5.4 in)
1999	133.8 mm (5.3 in)
2000	92.3 mm (3.6 in)
2001	125.2 mm (4.9 in)
2002	158.0 mm (6.2 in)
2003	110.3 mm (4.3 in)
2004	89.4 mm (3.5 in)
2005	144.0 mm (5.7 in)
2006	112.6 mm (4.4 in)
2007	109.5 mm (4.3 in)

Longest dry spell (CDD)

The longest dry spell of the year at Chemax, 1978 to 2007. The record is 88 days in 1980, marked on the chart; the median year is 35 days.

Longest dry spell (CDD) at Chemax by year
Year	Longest dry spell (CDD)
1978	27 days
1979	68 days
1980	88 days
1981	63 days
1982	56 days
1983	34 days
1984	35 days
1985	44 days
1986	65 days
1987	25 days
1988	35 days
1989	32 days
1990	39 days
1991	30 days
1992	27 days
1993	62 days
1994	42 days
1995	35 days
1996	34 days
1997	18 days
1998	29 days
1999	34 days
2000	83 days
2001	42 days
2002	35 days
2003	44 days
2004	30 days
2005	42 days
2006	49 days
2007	19 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 Chemax standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Chemax 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).