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Data as of 2025-12-31
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Built 2026-10-17 (17 October 2026)

Piedras Negras (Obs) Threshold Days by Year

16 fixed thresholds counted per year at Piedras Negras (Obs) (MXM00076243): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Piedras Negras (Obs) Thresholds

  • Piedras Negras (Obs): days with 10 mm (0.39 in) or more of precipitation in 39 years, most in 1958 with 26.
  • Piedras Negras (Obs): days with 25 mm (0.98 in) or more of precipitation in 37 years, most in 1958 with 12.
  • Piedras Negras (Obs): days with 50 mm (1.97 in) or more of precipitation in 28 years, most in 1957 with 6.
  • Piedras Negras (Obs): days with a maximum temperature at or above 30 C (86 F) in 21 years, most in 1999 with 219.
  • 16 fixed thresholds have at least one qualifying day at Piedras Negras (Obs).
21 years with a qualifying day
Days at or above 30 C (86 F) per year at Piedras Negras (Obs) Days per year at Piedras Negras (Obs) with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 219 in 1999. 01002003001955: 2141956: 2021957: 1481958: 1671959: 1861960: 1981994: 1981995: 2021996: 2111997: 1861998: 2061999: 2192000: 2082001: 2022002: 1952003: 1762004: 1642005: 1982006: 2192007: 1972025: 871955195819941997200020032006
Days per year at Piedras Negras (Obs) with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 219 in 1999.
Days at or above 30 C (86 F) per year at Piedras Negras (Obs)
YearDaysDecade average
1955214183.4
1956202183.4
1957148183.4
1958167183.4
1959186183.4
1960198198
1994198203.7
1995202203.7
1996211203.7
1997186203.7
1998206203.7
1999219203.7
2000208194.9
2001202194.9
2002195194.9
2003176194.9
2004164194.9
2005198194.9
2006219194.9
2007197194.9
20258787
First to last qualifying date each year at Piedras Negras (Obs) For each year, a bar from the first to the last day at Piedras Negras (Obs) meeting 30 C (86 F). 1955: 2 March 1955 to 27 November 19551956: 7 January 1956 to 20 November 19561957: 9 February 1957 to 21 September 19571958: 3 April 1958 to 11 November 19581959: 17 February 1959 to 6 December 19591960: 8 February 1960 to 16 November 19601994: 21 February 1994 to 7 November 19941995: 1 February 1995 to 4 December 19951996: 16 January 1996 to 20 November 19961997: 2 January 1997 to 4 November 19971998: 7 February 1998 to 18 December 19981999: 16 January 1999 to 29 December 19992000: 9 January 2000 to 28 October 20002001: 19 February 2001 to 25 November 20012002: 21 January 2002 to 9 November 20022003: 6 March 2003 to 30 October 20032004: 3 March 2004 to 6 November 20042005: 13 February 2005 to 26 December 20052006: 1 January 2006 to 27 November 20062007: 25 February 2007 to 6 December 20072025: 3 February 2025 to 24 August 20251955195819941997200020032006JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Piedras Negras (Obs) meeting 30 C (86 F).
First to last qualifying date each year at Piedras Negras (Obs)
YearFirst dateLast date
19551955-03-021955-11-27
19561956-01-071956-11-20
19571957-02-091957-09-21
19581958-04-031958-11-11
19591959-02-171959-12-06
19601960-02-081960-11-16
19941994-02-211994-11-07
19951995-02-011995-12-04
19961996-01-161996-11-20
19971997-01-021997-11-04
19981998-02-071998-12-18
19991999-01-161999-12-29
20002000-01-092000-10-28
20012001-02-192001-11-25
20022002-01-212002-11-09
20032003-03-062003-10-30
20042004-03-032004-11-06
20052005-02-132005-12-26
20062006-01-012006-11-27
20072007-02-252007-12-06
20252025-02-032025-08-24

Every Fixed Threshold

Fixed thresholds at Piedras Negras (Obs)
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days21219199987
35 C (95 F): Days21160200066
40 C (104 F): Days2088200122
45 C (113 F): Days6719952
90 F (32.2 C): Days21187200675
100 F (37.8 C): Days21122200044
110 F (43.3 C): Days121820002
0 C (32 F): Ice days (max1119561
0 C (32 F): Frost days (min205619556
-10 C (14 F): Days with min1119551
20 C (68 F): Tropical nights (min21180200658
25 C (77 F): Days with min2165200629
10 mm (0.39 in): Days with 10 mm or more rain392619587
25 mm (0.98 in): Days with 25 mm or more rain371219583
50 mm (1.97 in): Days with 50 mm or more rain28619571
100 mm (3.94 in): Days with 100 mm or more rain14219571

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1955.

Download the Data

  • Data for Piedras Negras (Obs) 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 2026-10-15 (15 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2025-12-31).