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Built 2026-10-19 (19 October 2026)

Aileron Threshold Days by Year (ASN00015543)

4 fixed thresholds counted per year at Aileron (ASN00015543): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Aileron Thresholds

  • Aileron: days with 10 mm (0.39 in) or more of precipitation in 51 years, most in 1974 with 31.
  • Aileron: days with 25 mm (0.98 in) or more of precipitation in 47 years, most in 1975 with 11.
  • Aileron: days with 50 mm (1.97 in) or more of precipitation in 33 years, most in 1974 with 5.
  • Aileron: days with 100 mm (3.94 in) or more of precipitation in 5 years, most in 1950 with 1.
  • 4 fixed thresholds have at least one qualifying day at Aileron.
51 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Aileron Days per year at Aileron with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 31 in 1974. 0102030401949: 61950: 81951: 51952: 101953: 81954: 101955: 101957: 71958: 51959: 31960: 81962: 111963: 31964: 51965: 31966: 111967: 71968: 121969: 81970: 81971: 61972: 61973: 111974: 311975: 221976: 121977: 101979: 131980: 71982: 121983: 161986: 51987: 41988: 91989: 111990: 61991: 111992: 71993: 211994: 61995: 51996: 41997: 121998: 111999: 82000: 182001: 112002: 72004: 112018: 12020: 14194919551963196919751983199119972004
Days per year at Aileron with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 31 in 1974.
Days with 10 mm (0.39 in) or more of precipitation per year at Aileron
YearDaysDecade average
194966
195087.3
195157.3
1952107.3
195387.3
1954107.3
1955107.3
195777.3
195857.3
195937.3
196087.6
1962117.6
196337.6
196457.6
196537.6
1966117.6
196777.6
1968127.6
196987.6
1970813.2
1971613.2
1972613.2
19731113.2
19743113.2
19752213.2
19761213.2
19771013.2
19791313.2
198079.1
1982129.1
1983169.1
198659.1
198749.1
198899.1
1989119.1
199069.1
1991119.1
199279.1
1993219.1
199469.1
199559.1
199649.1
1997129.1
1998119.1
199989.1
20001811.8
20011111.8
2002711.8
20041111.8
201811
20201414
First to last qualifying date each year at Aileron For each year, a bar from the first to the last day at Aileron meeting 10 mm (0.39 in). 1949: 5 February 1949 to 21 February 19491950: 7 June 1950 to 24 December 19501951: 9 February 1951 to 23 November 19511952: 8 January 1952 to 28 December 19521953: 2 January 1953 to 30 December 19531954: 9 January 1954 to 9 December 19541955: 6 February 1955 to 28 July 19551957: 26 April 1957 to 30 December 19571958: 20 May 1958 to 22 November 19581959: 18 May 1959 to 2 November 19591960: 4 January 1960 to 30 December 19601962: 14 January 1962 to 22 October 19621963: 18 March 1963 to 16 May 19631964: 1 January 1964 to 26 September 19641965: 18 June 1965 to 13 December 19651966: 17 January 1966 to 31 October 19661967: 6 February 1967 to 6 March 19671968: 4 January 1968 to 17 December 19681969: 7 February 1969 to 6 December 19691970: 8 February 1970 to 7 December 19701971: 1 March 1971 to 11 December 19711972: 29 February 1972 to 10 November 19721973: 7 January 1973 to 16 December 19731974: 12 January 1974 to 18 December 19741975: 7 January 1975 to 18 December 19751976: 6 January 1976 to 11 December 19761977: 14 January 1977 to 5 September 19771979: 16 January 1979 to 15 December 19791980: 2 January 1980 to 27 May 19801982: 11 February 1982 to 29 December 19821983: 2 January 1983 to 1 December 19831986: 22 June 1986 to 25 July 19861987: 4 November 1987 to 24 December 19871988: 30 March 1988 to 26 December 19881989: 12 March 1989 to 14 December 19891990: 8 January 1990 to 21 May 19901991: 17 January 1991 to 30 December 19911992: 23 January 1992 to 18 November 19921993: 24 January 1993 to 23 December 19931994: 18 February 1994 to 23 December 19941995: 13 January 1995 to 3 March 19951996: 1 January 1996 to 3 December 19961997: 17 January 1997 to 19 December 19971998: 7 February 1998 to 22 December 19981999: 13 January 1999 to 18 December 19992000: 9 February 2000 to 23 December 20002001: 26 January 2001 to 9 November 20012002: 20 February 2002 to 4 December 20022004: 29 January 2004 to 4 November 20042018: 31 January 2018 to 31 January 20182020: 20 January 2020 to 25 December 202019491957196519721980199019972018JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Aileron meeting 10 mm (0.39 in).
First to last qualifying date each year at Aileron
YearFirst dateLast date
19491949-02-051949-02-21
19501950-06-071950-12-24
19511951-02-091951-11-23
19521952-01-081952-12-28
19531953-01-021953-12-30
19541954-01-091954-12-09
19551955-02-061955-07-28
19571957-04-261957-12-30
19581958-05-201958-11-22
19591959-05-181959-11-02
19601960-01-041960-12-30
19621962-01-141962-10-22
19631963-03-181963-05-16
19641964-01-011964-09-26
19651965-06-181965-12-13
19661966-01-171966-10-31
19671967-02-061967-03-06
19681968-01-041968-12-17
19691969-02-071969-12-06
19701970-02-081970-12-07
19711971-03-011971-12-11
19721972-02-291972-11-10
19731973-01-071973-12-16
19741974-01-121974-12-18
19751975-01-071975-12-18
19761976-01-061976-12-11
19771977-01-141977-09-05
19791979-01-161979-12-15
19801980-01-021980-05-27
19821982-02-111982-12-29
19831983-01-021983-12-01
19861986-06-221986-07-25
19871987-11-041987-12-24
19881988-03-301988-12-26
19891989-03-121989-12-14
19901990-01-081990-05-21
19911991-01-171991-12-30
19921992-01-231992-11-18
19931993-01-241993-12-23
19941994-02-181994-12-23
19951995-01-131995-03-03
19961996-01-011996-12-03
19971997-01-171997-12-19
19981998-02-071998-12-22
19991999-01-131999-12-18
20002000-02-092000-12-23
20012001-01-262001-11-09
20022002-02-202002-12-04
20042004-01-292004-11-04
20182018-01-312018-01-31
20202020-01-202020-12-25

Every Fixed Threshold

Fixed thresholds at Aileron
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain5131197414
25 mm (0.98 in): Days with 25 mm or more rain471119757
50 mm (1.97 in): Days with 50 mm or more rain33519742
100 mm (3.94 in): Days with 100 mm or more rain5119501

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 Aileron 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).