Piedras Negras Weather Records (MXN00021185)

Record envelope, standing records and threshold days for Piedras Negras (MXN00021185), Mexico, with 31 years of record.

Key Facts for Piedras Negras

Piedras Negras (MXN00021185) is a weather station in Mexico at 20.43 latitude and -97.75 longitude, 425 m (1,394 ft) above sea level.
The station reports from 1979 to 2009, 31 years of record.
1,464 records set at Piedras Negras still stand.
Records are tracked for no element yet: an element needs 30 years of data to be eligible.

About the Station

Location: Mexico, 20.43 latitude, -97.75 longitude.
Elevation: 425 m (1,394 ft).
Period of record: 1979 to 2009, 31 years.
Eligible elements: none yet.

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 Piedras Negras. 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 Piedras Negras, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	35.0 C (95.0 F)	3.3 C (37.9 F)	n/a	n/a
Feb	36.7 C (98.1 F)	5.0 C (41.0 F)	n/a	n/a
Mar	40.0 C (104.0 F)	5.0 C (41.0 F)	n/a	n/a
Apr	43.9 C (111.0 F)	7.8 C (46.0 F)	n/a	n/a
May	43.9 C (111.0 F)	10.6 C (51.1 F)	n/a	n/a
Jun	38.3 C (100.9 F)	11.7 C (53.1 F)	n/a	n/a
Jul	37.2 C (99.0 F)	11.7 C (53.1 F)	n/a	n/a
Aug	36.1 C (97.0 F)	10.6 C (51.1 F)	n/a	n/a
Sep	39.4 C (102.9 F)	10.6 C (51.1 F)	n/a	n/a
Oct	37.2 C (99.0 F)	10.0 C (50.0 F)	n/a	n/a
Nov	35.6 C (96.1 F)	3.9 C (39.0 F)	n/a	n/a
Dec	36.1 C (97.0 F)	1.1 C (34.0 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Piedras Negras still stand. 2005 holds the most, with 346.

Wettest Day of Each Month

Jun: 129.8 mm (5.1 in)

The wettest day on record for each calendar month at Piedras Negras. The most was 129.8 mm (5.1 in) on 28 June 1985.

Record daily precipitation for each month at Piedras Negras
Month	Record daily precipitation (mm)	Date
Jan	44.2 mm (1.7 in)	1 January 2008
Feb	32.8 mm (1.3 in)	12 February 2008
Mar	35.1 mm (1.4 in)	31 March 2007
Apr	90.7 mm (3.6 in)	10 April 1988
May	63.0 mm (2.5 in)	27 May 1984
Jun	129.8 mm (5.1 in)	28 June 1985
Jul	99.8 mm (3.9 in)	30 July 1987
Aug	92.2 mm (3.6 in)	6 August 2007
Sep	110.5 mm (4.4 in)	22 September 1987
Oct	85.6 mm (3.4 in)	16 October 2008
Nov	52.8 mm (2.1 in)	16 November 1985
Dec	28.4 mm (1.1 in)	21 December 1987

Period of Record Coverage

1981 to 2009

12 years of record at Piedras Negras, 1981 to 2009. 4 years have data for under 90 percent of days and are left out of rankings: 1981, 1982, 1983, 1988.

Days with data per year at Piedras Negras
Year	Days with data	Share of year	Complete
1981	153	42%	No
1982	327	90%	No
1983	241	66%	No
1984	361	99%	Yes
1985	361	99%	Yes
1986	363	99%	Yes
1987	363	99%	Yes
1988	239	65%	No
2005	365	100%	Yes
2007	365	100%	Yes
2008	365	100%	Yes
2009	361	99%	Yes

Latest Records

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

Extremes by Year

1979 to 2009

Yearly extremes at Piedras Negras: 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	38.6 C (101.5 F)	12
Coldest night (TNn)	1.1 C (34.0 F)	1983	6.7 C (44.1 F)	12
Wettest day (Rx1day)	129.8 mm (5.1 in)	1985	79.3 mm (3.1 in)	14
Wettest five days (Rx5day)	253.7 mm (10.0 in)	1988	142.4 mm (5.6 in)	14
Longest dry spell (CDD)	39 days	2005	22 days	14

Hottest day (TXx)

The hottest day of the year at Piedras Negras, 1979 to 2009. The record is 43.9 C (111.0 F) in 1984, marked on the chart; the median year is 38.6 C (101.5 F).

Hottest day (TXx) at Piedras Negras by year
Year	Hottest day (TXx)
1979	n/a
1980	n/a
1981	35.6 C (96.1 F)
1982	38.3 C (100.9 F)
1983	39.4 C (102.9 F)
1984	43.9 C (111.0 F)
1985	39.4 C (102.9 F)
1986	37.2 C (99.0 F)
1987	38.9 C (102.0 F)
1988	39.4 C (102.9 F)
2005	33.3 C (91.9 F)
2007	38.3 C (100.9 F)
2008	41.1 C (106.0 F)
2009	36.7 C (98.1 F)

Coldest night (TNn)

The coldest night of the year at Piedras Negras, 1979 to 2009. The record is 1.1 C (34.0 F) in 1983, marked on the chart; the median year is 6.7 C (44.1 F).

Coldest night (TNn) at Piedras Negras by year
Year	Coldest night (TNn)
1979	n/a
1980	n/a
1981	10.0 C (50.0 F)
1982	8.3 C (46.9 F)
1983	1.1 C (34.0 F)
1984	6.7 C (44.1 F)
1985	3.3 C (37.9 F)
1986	3.9 C (39.0 F)
1987	5.0 C (41.0 F)
1988	6.7 C (44.1 F)
2005	7.8 C (46.0 F)
2007	6.7 C (44.1 F)
2008	3.9 C (39.0 F)
2009	7.8 C (46.0 F)

Wettest day (Rx1day)

The wettest day of the year at Piedras Negras, 1979 to 2009. The record is 129.8 mm (5.1 in) in 1985, marked on the chart; the median year is 79.3 mm (3.1 in).

Wettest day (Rx1day) at Piedras Negras by year
Year	Wettest day (Rx1day)
1979	40.9 mm (1.6 in)
1980	14.5 mm (0.6 in)
1981	80.0 mm (3.1 in)
1982	70.6 mm (2.8 in)
1983	64.8 mm (2.6 in)
1984	78.5 mm (3.1 in)
1985	129.8 mm (5.1 in)
1986	75.9 mm (3.0 in)
1987	110.5 mm (4.4 in)
1988	106.4 mm (4.2 in)
2005	57.7 mm (2.3 in)
2007	92.2 mm (3.6 in)
2008	85.6 mm (3.4 in)
2009	91.9 mm (3.6 in)

Wettest five days (Rx5day)

The wettest five days of the year at Piedras Negras, 1979 to 2009. The record is 253.7 mm (10.0 in) in 1988, marked on the chart; the median year is 142.4 mm (5.6 in).

Wettest five days (Rx5day) at Piedras Negras by year
Year	Wettest five days (Rx5day)
1979	75.2 mm (3.0 in)
1980	19.0 mm (0.7 in)
1981	106.1 mm (4.2 in)
1982	140.0 mm (5.5 in)
1983	92.0 mm (3.6 in)
1984	208.5 mm (8.2 in)
1985	203.1 mm (8.0 in)
1986	144.8 mm (5.7 in)
1987	214.5 mm (8.4 in)
1988	253.7 mm (10.0 in)
2005	172.3 mm (6.8 in)
2007	123.4 mm (4.9 in)
2008	146.6 mm (5.8 in)
2009	120.6 mm (4.7 in)

Longest dry spell (CDD)

The longest dry spell of the year at Piedras Negras, 1979 to 2009. The record is 39 days in 2005, marked on the chart; the median year is 22 days.

Longest dry spell (CDD) at Piedras Negras by year
Year	Longest dry spell (CDD)
1979	13 days
1980	16 days
1981	22 days
1982	28 days
1983	31 days
1984	22 days
1985	21 days
1986	22 days
1987	17 days
1988	20 days
2005	39 days
2007	33 days
2008	31 days
2009	33 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 Piedras Negras standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Piedras Negras 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 2026-10-14 (14 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).