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Built 2026-10-19 (19 October 2026)

Alvin Threshold Days by Year (USC00410204)

15 fixed thresholds counted per year at Alvin (USC00410204): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Alvin Thresholds

  • Alvin: days with 10 mm (0.39 in) or more of precipitation in 92 years, most in 1979 with 55.
  • Alvin: days with 25 mm (0.98 in) or more of precipitation in 92 years, most in 1944 with 28.
  • Alvin: days with 50 mm (1.97 in) or more of precipitation in 92 years, most in 2004 with 12.
  • Alvin: days with 100 mm (3.94 in) or more of precipitation in 46 years, most in 1900 with 5.
  • 15 fixed thresholds have at least one qualifying day at Alvin.
31 years with a qualifying day
Days at or above 30 C (86 F) per year at Alvin Days per year at Alvin with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 146 in 1911. 0501001501911: 1461912: 1371913: 1131914: 931966: 1261967: 1231968: 1231969: 1411970: 1151971: 1331974: 1251975: 1141977: 1371978: 1301979: 1081980: 1341981: 1321982: 1331983: 1061984: 1111985: 1201986: 1241987: 1171988: 1151991: 1361996: 1242004: 1322006: 1082007: 1112008: 1202009: 12319111966197019771981198519912007
Days per year at Alvin with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 146 in 1911.
Days at or above 30 C (86 F) per year at Alvin
YearDaysDecade average
1911146122.3
1912137122.3
1913113122.3
191493122.3
1966126128.3
1967123128.3
1968123128.3
1969141128.3
1970115123.1
1971133123.1
1974125123.1
1975114123.1
1977137123.1
1978130123.1
1979108123.1
1980134121.3
1981132121.3
1982133121.3
1983106121.3
1984111121.3
1985120121.3
1986124121.3
1987117121.3
1988115121.3
1991136130
1996124130
2004132118.8
2006108118.8
2007111118.8
2008120118.8
2009123118.8
First to last qualifying date each year at Alvin For each year, a bar from the first to the last day at Alvin meeting 30 C (86 F). 1911: 7 March 1911 to 15 October 19111912: 13 April 1912 to 11 October 19121913: 15 April 1913 to 10 October 19131914: 5 May 1914 to 10 October 19141966: 2 April 1966 to 6 December 19661967: 16 March 1967 to 27 November 19671968: 15 April 1968 to 31 October 19681969: 11 April 1969 to 13 November 19691970: 29 April 1970 to 27 October 19701971: 23 March 1971 to 3 November 19711974: 30 March 1974 to 4 November 19741975: 26 April 1975 to 18 October 19751977: 6 May 1977 to 2 November 19771978: 19 April 1978 to 21 October 19781979: 14 April 1979 to 31 October 19791980: 11 March 1980 to 19 October 19801981: 31 March 1981 to 18 October 19811982: 6 April 1982 to 3 November 19821983: 9 May 1983 to 6 October 19831984: 4 May 1984 to 29 October 19841985: 17 April 1985 to 20 October 19851986: 19 February 1986 to 6 October 19861987: 17 April 1987 to 6 November 19871988: 24 April 1988 to 9 November 19881991: 19 April 1991 to 30 October 19911996: 13 April 1996 to 1 November 19962004: 29 May 2004 to 31 October 20042006: 18 April 2006 to 7 October 20062007: 13 May 2007 to 19 October 20072008: 16 March 2008 to 14 October 20082009: 11 April 2009 to 16 October 200919111966197019771981198519912007JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Alvin meeting 30 C (86 F).
First to last qualifying date each year at Alvin
YearFirst dateLast date
19111911-03-071911-10-15
19121912-04-131912-10-11
19131913-04-151913-10-10
19141914-05-051914-10-10
19661966-04-021966-12-06
19671967-03-161967-11-27
19681968-04-151968-10-31
19691969-04-111969-11-13
19701970-04-291970-10-27
19711971-03-231971-11-03
19741974-03-301974-11-04
19751975-04-261975-10-18
19771977-05-061977-11-02
19781978-04-191978-10-21
19791979-04-141979-10-31
19801980-03-111980-10-19
19811981-03-311981-10-18
19821982-04-061982-11-03
19831983-05-091983-10-06
19841984-05-041984-10-29
19851985-04-171985-10-20
19861986-02-191986-10-06
19871987-04-171987-11-06
19881988-04-241988-11-09
19911991-04-191991-10-30
19961996-04-131996-11-01
20042004-05-292004-10-31
20062006-04-182006-10-07
20072007-05-132007-10-19
20082008-03-162008-10-14
20092009-04-112009-10-16

Every Fixed Threshold

Fixed thresholds at Alvin
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days311461911123
35 C (95 F): Days3042191317
90 F (32.2 C): Days31105198273
100 F (37.8 C): Days5419131
0 C (32 F): Ice days (max5319831
0 C (32 F): Frost days (min3141191412
-10 C (14 F): Days with min2219832
20 C (68 F): Tropical nights (min311681996141
25 C (77 F): Days with min2721199613
10 mm (0.39 in): Days with 10 mm or more rain9255197927
25 mm (0.98 in): Days with 25 mm or more rain9228194412
50 mm (1.97 in): Days with 50 mm or more rain921220044
100 mm (3.94 in): Days with 100 mm or more rain46519001
200 mm (7.87 in): Days with 200 mm or more rain7219001
10 cm (3.9 in): Days with 10 cm or more snowfall1119601

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1911.

Download the Data

  • Data for Alvin 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 (2025-12-31).