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Data as of 2025-12-31
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Built 2026-10-19 (19 October 2026)

Aly Threshold Days by Year (USC00030136)

5 fixed thresholds counted per year at Aly (USC00030136): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Aly Thresholds

  • Aly: days with 10 mm (0.39 in) or more of precipitation in 28 years, most in 1973 with 58.
  • Aly: days with 25 mm (0.98 in) or more of precipitation in 28 years, most in 1979 with 26.
  • Aly: days with 50 mm (1.97 in) or more of precipitation in 27 years, most in 1973 with 9.
  • Aly: days with 100 mm (3.94 in) or more of precipitation in 7 years, most in 1952 with 1.
  • 5 fixed thresholds have at least one qualifying day at Aly.
28 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Aly Days per year at Aly with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 58 in 1973. 02040601949: 491951: 411952: 421953: 301955: 381956: 331957: 551958: 491960: 411961: 441962: 381963: 231964: 321965: 431966: 271967: 471968: 571969: 401970: 391971: 401972: 311973: 581974: 421975: 401976: 301977: 371978: 381979: 451949195319571961196419671970197319761979
Days per year at Aly with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 58 in 1973.
Days with 10 mm (0.39 in) or more of precipitation per year at Aly
YearDaysDecade average
19494949
19514141.1
19524241.1
19533041.1
19553841.1
19563341.1
19575541.1
19584941.1
19604139.2
19614439.2
19623839.2
19632339.2
19643239.2
19654339.2
19662739.2
19674739.2
19685739.2
19694039.2
19703940
19714040
19723140
19735840
19744240
19754040
19763040
19773740
19783840
19794540
First to last qualifying date each year at Aly For each year, a bar from the first to the last day at Aly meeting 10 mm (0.39 in). 1949: 3 January 1949 to 26 December 19491951: 2 January 1951 to 25 December 19511952: 2 January 1952 to 31 December 19521953: 17 January 1953 to 28 December 19531955: 10 January 1955 to 1 December 19551956: 19 January 1956 to 22 December 19561957: 4 January 1957 to 25 December 19571958: 12 January 1958 to 13 December 19581960: 6 January 1960 to 31 December 19601961: 1 January 1961 to 17 December 19611962: 15 January 1962 to 29 December 19621963: 10 February 1963 to 10 December 19631964: 5 February 1964 to 4 December 19641965: 2 January 1965 to 12 December 19651966: 1 January 1966 to 31 December 19661967: 26 January 1967 to 21 December 19671968: 3 January 1968 to 27 December 19681969: 17 January 1969 to 30 December 19691970: 2 February 1970 to 22 December 19701971: 3 January 1971 to 30 December 19711972: 27 January 1972 to 30 December 19721973: 3 January 1973 to 24 December 19731974: 11 January 1974 to 6 December 19741975: 3 January 1975 to 6 December 19751976: 18 February 1976 to 11 December 19761977: 9 January 1977 to 5 December 19771978: 12 January 1978 to 31 December 19781979: 1 January 1979 to 24 December 19791949195519601964196819721976JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Aly meeting 10 mm (0.39 in).
First to last qualifying date each year at Aly
YearFirst dateLast date
19491949-01-031949-12-26
19511951-01-021951-12-25
19521952-01-021952-12-31
19531953-01-171953-12-28
19551955-01-101955-12-01
19561956-01-191956-12-22
19571957-01-041957-12-25
19581958-01-121958-12-13
19601960-01-061960-12-31
19611961-01-011961-12-17
19621962-01-151962-12-29
19631963-02-101963-12-10
19641964-02-051964-12-04
19651965-01-021965-12-12
19661966-01-011966-12-31
19671967-01-261967-12-21
19681968-01-031968-12-27
19691969-01-171969-12-30
19701970-02-021970-12-22
19711971-01-031971-12-30
19721972-01-271972-12-30
19731973-01-031973-12-24
19741974-01-111974-12-06
19751975-01-031975-12-06
19761976-02-181976-12-11
19771977-01-091977-12-05
19781978-01-121978-12-31
19791979-01-011979-12-24

Every Fixed Threshold

Fixed thresholds at Aly
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain2858197345
25 mm (0.98 in): Days with 25 mm or more rain2826197926
50 mm (1.97 in): Days with 50 mm or more rain27919738
100 mm (3.94 in): Days with 100 mm or more rain7119521
10 cm (3.9 in): Days with 10 cm or more snowfall2119621

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1949.

Download the Data

  • Data for Aly 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).