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Built 2026-10-19 (19 October 2026)

Ozone Threshold Days by Year (USC00035514)

6 fixed thresholds counted per year at Ozone (USC00035514): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Ozone Thresholds

  • Ozone: days with 10 mm (0.39 in) or more of precipitation in 58 years, most in 1957 with 61.
  • Ozone: days with 25 mm (0.98 in) or more of precipitation in 58 years, most in 1957 with 30.
  • Ozone: days with 50 mm (1.97 in) or more of precipitation in 57 years, most in 2015 with 14.
  • Ozone: days with 100 mm (3.94 in) or more of precipitation in 21 years, most in 2008 with 3.
  • 6 fixed thresholds have at least one qualifying day at Ozone.
58 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Ozone Days per year at Ozone with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 61 in 1957. 0204060801956: 341957: 611958: 401959: 431960: 371961: 591962: 391963: 241964: 331966: 351967: 371968: 501969: 361970: 401971: 371972: 371973: 551975: 421976: 381977: 441978: 391979: 431980: 241981: 321982: 421983: 411984: 421985: 311986: 411987: 421988: 371989: 451990: 501991: 461994: 411995: 411996: 401997: 481998: 491999: 352000: 402001: 342002: 422005: 292006: 432007: 382008: 502011: 482015: 582016: 382017: 502018: 562019: 572020: 612021: 462022: 472023: 422024: 431956196219691976198219881996200220152021
Days per year at Ozone with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 61 in 1957.
Days with 10 mm (0.39 in) or more of precipitation per year at Ozone
YearDaysDecade average
19563444.5
19576144.5
19584044.5
19594344.5
19603738.9
19615938.9
19623938.9
19632438.9
19643338.9
19663538.9
19673738.9
19685038.9
19693638.9
19704041.7
19713741.7
19723741.7
19735541.7
19754241.7
19763841.7
19774441.7
19783941.7
19794341.7
19802437.7
19813237.7
19824237.7
19834137.7
19844237.7
19853137.7
19864137.7
19874237.7
19883737.7
19894537.7
19905043.8
19914643.8
19944143.8
19954143.8
19964043.8
19974843.8
19984943.8
19993543.8
20004039.4
20013439.4
20024239.4
20052939.4
20064339.4
20073839.4
20085039.4
20114851.2
20155851.2
20163851.2
20175051.2
20185651.2
20195751.2
20206147.8
20214647.8
20224747.8
20234247.8
20244347.8
First to last qualifying date each year at Ozone For each year, a bar from the first to the last day at Ozone meeting 10 mm (0.39 in). 1956: 2 February 1956 to 23 December 19561957: 22 January 1957 to 25 December 19571958: 13 January 1958 to 28 November 19581959: 14 February 1959 to 27 December 19591960: 14 January 1960 to 31 December 19601961: 1 January 1961 to 17 December 19611962: 5 January 1962 to 21 December 19621963: 5 January 1963 to 22 December 19631964: 31 January 1964 to 10 December 19641966: 1 January 1966 to 28 December 19661967: 26 January 1967 to 21 December 19671968: 23 January 1968 to 28 December 19681969: 16 January 1969 to 31 December 19691970: 2 February 1970 to 21 December 19701971: 4 January 1971 to 30 December 19711972: 27 January 1972 to 30 December 19721973: 3 January 1973 to 24 December 19731975: 10 January 1975 to 29 December 19751976: 25 January 1976 to 11 December 19761977: 9 January 1977 to 14 December 19771978: 9 January 1978 to 31 December 19781979: 21 February 1979 to 24 December 19791980: 16 January 1980 to 9 December 19801981: 1 February 1981 to 30 November 19811982: 2 January 1982 to 28 December 19821983: 29 January 1983 to 11 December 19831984: 12 February 1984 to 30 December 19841985: 22 February 1985 to 11 December 19851986: 17 January 1986 to 9 December 19861987: 8 January 1987 to 27 December 19871988: 6 January 1988 to 26 November 19881989: 6 January 1989 to 30 December 19891990: 4 January 1990 to 30 December 19901991: 6 January 1991 to 21 December 19911994: 11 January 1994 to 15 December 19941995: 5 January 1995 to 18 December 19951996: 1 January 1996 to 26 December 19961997: 8 January 1997 to 20 December 19971998: 3 January 1998 to 18 December 19981999: 1 January 1999 to 13 December 19992000: 3 January 2000 to 26 December 20002001: 14 January 2001 to 17 December 20012002: 6 January 2002 to 31 December 20022005: 3 January 2005 to 27 November 20052006: 10 January 2006 to 30 December 20062007: 13 January 2007 to 10 December 20072008: 22 January 2008 to 28 December 20082011: 2 February 2011 to 6 December 20112015: 3 January 2015 to 28 December 20152016: 7 January 2016 to 4 December 20162017: 16 January 2017 to 23 December 20172018: 8 January 2018 to 31 December 20182019: 4 January 2019 to 29 December 20192020: 10 January 2020 to 30 December 20202021: 1 January 2021 to 18 December 20212022: 1 January 2022 to 14 December 20222023: 3 January 2023 to 25 December 20232024: 9 January 2024 to 19 November 202419561964197319821990200020152023JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Ozone meeting 10 mm (0.39 in).
First to last qualifying date each year at Ozone
YearFirst dateLast date
19561956-02-021956-12-23
19571957-01-221957-12-25
19581958-01-131958-11-28
19591959-02-141959-12-27
19601960-01-141960-12-31
19611961-01-011961-12-17
19621962-01-051962-12-21
19631963-01-051963-12-22
19641964-01-311964-12-10
19661966-01-011966-12-28
19671967-01-261967-12-21
19681968-01-231968-12-28
19691969-01-161969-12-31
19701970-02-021970-12-21
19711971-01-041971-12-30
19721972-01-271972-12-30
19731973-01-031973-12-24
19751975-01-101975-12-29
19761976-01-251976-12-11
19771977-01-091977-12-14
19781978-01-091978-12-31
19791979-02-211979-12-24
19801980-01-161980-12-09
19811981-02-011981-11-30
19821982-01-021982-12-28
19831983-01-291983-12-11
19841984-02-121984-12-30
19851985-02-221985-12-11
19861986-01-171986-12-09
19871987-01-081987-12-27
19881988-01-061988-11-26
19891989-01-061989-12-30
19901990-01-041990-12-30
19911991-01-061991-12-21
19941994-01-111994-12-15
19951995-01-051995-12-18
19961996-01-011996-12-26
19971997-01-081997-12-20
19981998-01-031998-12-18
19991999-01-011999-12-13
20002000-01-032000-12-26
20012001-01-142001-12-17
20022002-01-062002-12-31
20052005-01-032005-11-27
20062006-01-102006-12-30
20072007-01-132007-12-10
20082008-01-222008-12-28
20112011-02-022011-12-06
20152015-01-032015-12-28
20162016-01-072016-12-04
20172017-01-162017-12-23
20182018-01-082018-12-31
20192019-01-042019-12-29
20202020-01-102020-12-30
20212021-01-012021-12-18
20222022-01-012022-12-14
20232023-01-032023-12-25
20242024-01-092024-11-19

Every Fixed Threshold

Fixed thresholds at Ozone
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
10 mm (0.39 in): Days with 10 mm or more rain5861195743
25 mm (0.98 in): Days with 25 mm or more rain5830195719
50 mm (1.97 in): Days with 50 mm or more rain571420153
100 mm (3.94 in): Days with 100 mm or more rain21320083
10 cm (3.9 in): Days with 10 cm or more snowfall17319601
25 cm (9.8 in): Days with 25 cm or more snowfall3119751

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1956.

Download the Data

  • Data for Ozone 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).