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Built 2026-10-19 (19 October 2026)

Alamo Dam Threshold Days by Year

15 fixed thresholds counted per year at Alamo Dam (USC00020100): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Alamo Dam Thresholds

  • Alamo Dam: days with a maximum temperature at or above 30 C (86 F) in 49 years, most in 2016 with 218.
  • Alamo Dam: days with a maximum temperature at or above 35 C (95 F) in 49 years, most in 1989 with 171.
  • Alamo Dam: days with a maximum temperature at or above 40 C (104 F) in 49 years, most in 2020 with 120.
  • Alamo Dam: days with a maximum temperature at or above 45 C (113 F) in 49 years, most in 2020 with 36.
  • 15 fixed thresholds have at least one qualifying day at Alamo Dam.
49 years with a qualifying day
Days at or above 30 C (86 F) per year at Alamo Dam Days per year at Alamo Dam with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 218 in 2016. 01002003001976: 1841977: 1791978: 1831979: 1821980: 1741981: 1941982: 1711983: 1601984: 1701985: 1821986: 1851987: 1941988: 2031989: 2151990: 2011991: 1751992: 1931993: 1951994: 1951995: 1911996: 2021997: 2071998: 1781999: 2052000: 1982001: 2152002: 2022003: 1932004: 2082005: 1902006: 1962007: 2042008: 1922009: 1832010: 1692011: 1842012: 2002013: 1962014: 2112015: 1902016: 2182018: 1882020: 1942021: 2012022: 1922023: 1852024: 1902025: 1982026: 1331976198119861991199620012006201120162023
Days per year at Alamo Dam with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 218 in 2016.
Days at or above 30 C (86 F) per year at Alamo Dam
YearDaysDecade average
1976184182
1977179182
1978183182
1979182182
1980174184.8
1981194184.8
1982171184.8
1983160184.8
1984170184.8
1985182184.8
1986185184.8
1987194184.8
1988203184.8
1989215184.8
1990201194.2
1991175194.2
1992193194.2
1993195194.2
1994195194.2
1995191194.2
1996202194.2
1997207194.2
1998178194.2
1999205194.2
2000198198.1
2001215198.1
2002202198.1
2003193198.1
2004208198.1
2005190198.1
2006196198.1
2007204198.1
2008192198.1
2009183198.1
2010169194.5
2011184194.5
2012200194.5
2013196194.5
2014211194.5
2015190194.5
2016218194.5
2018188194.5
2020194184.7
2021201184.7
2022192184.7
2023185184.7
2024190184.7
2025198184.7
2026133184.7
First to last qualifying date each year at Alamo Dam For each year, a bar from the first to the last day at Alamo Dam meeting 30 C (86 F). 1976: 19 March 1976 to 9 November 19761977: 20 February 1977 to 4 November 19771978: 27 March 1978 to 10 November 19781979: 8 March 1979 to 29 October 19791980: 10 April 1980 to 11 November 19801981: 20 February 1981 to 6 November 19811982: 14 April 1982 to 26 October 19821983: 18 April 1983 to 4 November 19831984: 21 March 1984 to 6 November 19841985: 2 April 1985 to 4 November 19851986: 25 February 1986 to 31 October 19861987: 5 March 1987 to 29 October 19871988: 20 March 1988 to 8 November 19881989: 25 February 1989 to 20 November 19891990: 20 March 1990 to 15 November 19901991: 5 April 1991 to 9 November 19911992: 9 April 1992 to 24 October 19921993: 23 March 1993 to 10 November 19931994: 4 March 1994 to 2 November 19941995: 16 March 1995 to 26 November 19951996: 9 February 1996 to 14 November 19961997: 9 March 1997 to 8 November 19971998: 23 March 1998 to 25 October 19981999: 1 March 1999 to 17 November 19992000: 15 March 2000 to 25 October 20002001: 20 March 2001 to 9 November 20012002: 11 March 2002 to 24 November 20022003: 2 February 2003 to 29 October 20032004: 8 March 2004 to 17 October 20042005: 12 March 2005 to 9 November 20052006: 25 March 2006 to 22 November 20062007: 8 March 2007 to 20 November 20072008: 14 March 2008 to 20 November 20082009: 2 March 2009 to 12 November 20092010: 31 March 2010 to 7 November 20102011: 12 March 2011 to 2 November 20112012: 16 March 2012 to 8 November 20122013: 15 March 2013 to 13 November 20132014: 15 February 2014 to 11 November 20142015: 10 February 2015 to 3 November 20152016: 17 February 2016 to 16 November 20162018: 9 March 2018 to 6 November 20182020: 17 April 2020 to 18 November 20202021: 6 March 2021 to 17 November 20212022: 3 March 2022 to 23 October 20222023: 10 April 2023 to 15 November 20232024: 10 April 2024 to 28 October 20242025: 26 February 2025 to 15 November 20252026: 26 February 2026 to 31 August 20261976198319901997200420112020JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Alamo Dam meeting 30 C (86 F).
First to last qualifying date each year at Alamo Dam
YearFirst dateLast date
19761976-03-191976-11-09
19771977-02-201977-11-04
19781978-03-271978-11-10
19791979-03-081979-10-29
19801980-04-101980-11-11
19811981-02-201981-11-06
19821982-04-141982-10-26
19831983-04-181983-11-04
19841984-03-211984-11-06
19851985-04-021985-11-04
19861986-02-251986-10-31
19871987-03-051987-10-29
19881988-03-201988-11-08
19891989-02-251989-11-20
19901990-03-201990-11-15
19911991-04-051991-11-09
19921992-04-091992-10-24
19931993-03-231993-11-10
19941994-03-041994-11-02
19951995-03-161995-11-26
19961996-02-091996-11-14
19971997-03-091997-11-08
19981998-03-231998-10-25
19991999-03-011999-11-17
20002000-03-152000-10-25
20012001-03-202001-11-09
20022002-03-112002-11-24
20032003-02-022003-10-29
20042004-03-082004-10-17
20052005-03-122005-11-09
20062006-03-252006-11-22
20072007-03-082007-11-20
20082008-03-142008-11-20
20092009-03-022009-11-12
20102010-03-312010-11-07
20112011-03-122011-11-02
20122012-03-162012-11-08
20132013-03-152013-11-13
20142014-02-152014-11-11
20152015-02-102015-11-03
20162016-02-172016-11-16
20182018-03-092018-11-06
20202020-04-172020-11-18
20212021-03-062021-11-17
20222022-03-032022-10-23
20232023-04-102023-11-15
20242024-04-102024-10-28
20252025-02-262025-11-15
20262026-02-262026-08-31

Every Fixed Threshold

Fixed thresholds at Alamo Dam
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days492182016133
35 C (95 F): Days491711989108
40 C (104 F): Days49120202075
45 C (113 F): Days4936202016
50 C (122 F): Days5119941
90 F (32.2 C): Days491962001123
100 F (37.8 C): Days49144202088
110 F (43.3 C): Days4978202442
120 F (48.9 C): Days10219942
0 C (32 F): Frost days (min454920202
20 C (68 F): Tropical nights (min46120198188
25 C (77 F): Days with min4670198161
10 mm (0.39 in): Days with 10 mm or more rain491519781
25 mm (0.98 in): Days with 25 mm or more rain34620042
50 mm (1.97 in): Days with 50 mm or more rain6219831

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1976.

Download the Data

  • Data for Alamo Dam 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 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2026-10-17).