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Built 2026-10-19 (19 October 2026)

Detroit Dam Threshold Days by Year (USC00352292)

16 fixed thresholds counted per year at Detroit Dam (USC00352292): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Detroit Dam Thresholds

  • Detroit Dam: days with a maximum temperature at or above 30 C (86 F) in 71 years, most in 2003 with 46.
  • Detroit Dam: days with 10 mm (0.39 in) or more of precipitation in 71 years, most in 1996 with 103.
  • Detroit Dam: days with 25 mm (0.98 in) or more of precipitation in 71 years, most in 1995 with 44.
  • Detroit Dam: days with 50 mm (1.97 in) or more of precipitation in 71 years, most in 1996 with 17.
  • 16 fixed thresholds have at least one qualifying day at Detroit Dam.
71 years with a qualifying day
Days at or above 30 C (86 F) per year at Detroit Dam Days per year at Detroit Dam with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 46 in 2003. 02040601955: 141956: 221957: 111958: 411959: 181960: 231961: 321962: 201963: 141964: 101965: 201966: 201967: 421968: 171969: 161970: 361971: 151972: 271973: 201974: 241975: 151976: 31977: 151978: 171979: 151980: 71981: 181982: 91983: 41984: 101985: 241986: 231987: 321988: 351989: 81990: 261991: 301992: 371993: 151994: 191995: 191996: 301997: 211998: 321999: 232000: 272001: 192002: 312003: 462004: 362005: 322006: 362007: 182008: 202009: 252010: 202011: 202012: 202013: 242014: 332015: 332016: 212018: 322019: 102020: 262021: 322022: 302023: 242024: 262025: 292026: 12195519631971197919871995200320112020
Days per year at Detroit Dam with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 46 in 2003.
Days at or above 30 C (86 F) per year at Detroit Dam
YearDaysDecade average
19551421.2
19562221.2
19571121.2
19584121.2
19591821.2
19602321.4
19613221.4
19622021.4
19631421.4
19641021.4
19652021.4
19662021.4
19674221.4
19681721.4
19691621.4
19703618.7
19711518.7
19722718.7
19732018.7
19742418.7
19751518.7
1976318.7
19771518.7
19781718.7
19791518.7
1980717
19811817
1982917
1983417
19841017
19852417
19862317
19873217
19883517
1989817
19902625.2
19913025.2
19923725.2
19931525.2
19941925.2
19951925.2
19963025.2
19972125.2
19983225.2
19992325.2
20002729
20011929
20023129
20034629
20043629
20053229
20063629
20071829
20082029
20092529
20102023.7
20112023.7
20122023.7
20132423.7
20143323.7
20153323.7
20162123.7
20183223.7
20191023.7
20202625.6
20213225.6
20223025.6
20232425.6
20242625.6
20252925.6
20261225.6
First to last qualifying date each year at Detroit Dam For each year, a bar from the first to the last day at Detroit Dam meeting 30 C (86 F). 1955: 8 June 1955 to 7 September 19551956: 17 May 1956 to 7 September 19561957: 30 April 1957 to 24 September 19571958: 16 May 1958 to 8 September 19581959: 19 June 1959 to 3 September 19591960: 3 June 1960 to 30 September 19601961: 2 June 1961 to 14 September 19611962: 21 July 1962 to 18 September 19621963: 18 May 1963 to 28 September 19631964: 12 July 1964 to 25 August 19641965: 30 June 1965 to 1 September 19651966: 15 June 1966 to 1 October 19661967: 16 June 1967 to 28 September 19671968: 25 June 1968 to 6 September 19681969: 18 May 1969 to 12 September 19691970: 16 May 1970 to 3 October 19701971: 12 May 1971 to 13 August 19711972: 28 May 1972 to 4 September 19721973: 14 May 1973 to 11 September 19731974: 30 June 1974 to 26 September 19741975: 14 May 1975 to 2 October 19751976: 16 July 1976 to 10 September 19761977: 1 July 1977 to 18 August 19771978: 3 June 1978 to 10 August 19781979: 2 June 1979 to 15 September 19791980: 22 July 1980 to 6 October 19801981: 3 July 1981 to 16 September 19811982: 25 May 1982 to 3 September 19821983: 24 May 1983 to 14 August 19831984: 16 July 1984 to 27 August 19841985: 17 June 1985 to 27 August 19851986: 31 May 1986 to 7 September 19861987: 3 April 1987 to 2 October 19871988: 22 May 1988 to 14 September 19881989: 5 June 1989 to 29 September 19891990: 5 May 1990 to 23 September 19901991: 3 July 1991 to 1 October 19911992: 4 May 1992 to 23 September 19921993: 11 May 1993 to 30 September 19931994: 8 July 1994 to 23 September 19941995: 2 June 1995 to 15 September 19951996: 3 June 1996 to 11 September 19961997: 12 May 1997 to 9 September 19971998: 30 April 1998 to 16 September 19981999: 10 July 1999 to 23 September 19992000: 18 June 2000 to 15 September 20002001: 22 May 2001 to 25 September 20012002: 13 June 2002 to 24 September 20022003: 24 May 2003 to 28 September 20032004: 27 April 2004 to 1 September 20042005: 27 May 2005 to 2 September 20052006: 16 May 2006 to 7 September 20062007: 30 May 2007 to 12 September 20072008: 28 June 2008 to 18 September 20082009: 29 May 2009 to 23 September 20092010: 7 July 2010 to 4 September 20102011: 8 July 2011 to 24 September 20112012: 14 May 2012 to 18 September 20122013: 29 June 2013 to 12 September 20132014: 2 May 2014 to 21 September 20142015: 7 June 2015 to 13 September 20152016: 19 April 2016 to 27 August 20162018: 26 April 2018 to 23 August 20182019: 12 June 2019 to 6 September 20192020: 10 May 2020 to 8 September 20202021: 2 June 2021 to 9 September 20212022: 26 June 2022 to 11 September 20222023: 29 April 2023 to 16 September 20232024: 5 July 2024 to 25 September 20242025: 8 June 2025 to 17 September 20252026: 14 June 2026 to 25 August 202619551964197319821991200020092019JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Detroit Dam meeting 30 C (86 F).
First to last qualifying date each year at Detroit Dam
YearFirst dateLast date
19551955-06-081955-09-07
19561956-05-171956-09-07
19571957-04-301957-09-24
19581958-05-161958-09-08
19591959-06-191959-09-03
19601960-06-031960-09-30
19611961-06-021961-09-14
19621962-07-211962-09-18
19631963-05-181963-09-28
19641964-07-121964-08-25
19651965-06-301965-09-01
19661966-06-151966-10-01
19671967-06-161967-09-28
19681968-06-251968-09-06
19691969-05-181969-09-12
19701970-05-161970-10-03
19711971-05-121971-08-13
19721972-05-281972-09-04
19731973-05-141973-09-11
19741974-06-301974-09-26
19751975-05-141975-10-02
19761976-07-161976-09-10
19771977-07-011977-08-18
19781978-06-031978-08-10
19791979-06-021979-09-15
19801980-07-221980-10-06
19811981-07-031981-09-16
19821982-05-251982-09-03
19831983-05-241983-08-14
19841984-07-161984-08-27
19851985-06-171985-08-27
19861986-05-311986-09-07
19871987-04-031987-10-02
19881988-05-221988-09-14
19891989-06-051989-09-29
19901990-05-051990-09-23
19911991-07-031991-10-01
19921992-05-041992-09-23
19931993-05-111993-09-30
19941994-07-081994-09-23
19951995-06-021995-09-15
19961996-06-031996-09-11
19971997-05-121997-09-09
19981998-04-301998-09-16
19991999-07-101999-09-23
20002000-06-182000-09-15
20012001-05-222001-09-25
20022002-06-132002-09-24
20032003-05-242003-09-28
20042004-04-272004-09-01
20052005-05-272005-09-02
20062006-05-162006-09-07
20072007-05-302007-09-12
20082008-06-282008-09-18
20092009-05-292009-09-23
20102010-07-072010-09-04
20112011-07-082011-09-24
20122012-05-142012-09-18
20132013-06-292013-09-12
20142014-05-022014-09-21
20152015-06-072015-09-13
20162016-04-192016-08-27
20182018-04-262018-08-23
20192019-06-122019-09-06
20202020-05-102020-09-08
20212021-06-022021-09-09
20222022-06-262022-09-11
20232023-04-292023-09-16
20242024-07-052024-09-25
20252025-06-082025-09-17
20262026-06-142026-08-25

Every Fixed Threshold

Fixed thresholds at Detroit Dam
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days7146200312
35 C (95 F): Days581120033
40 C (104 F): Days8220212
90 F (32.2 C): Days702820035
100 F (37.8 C): Days26519882
110 F (43.3 C): Days1120211
0 C (32 F): Ice days (max421519722
0 C (32 F): Frost days (min6811920117
-10 C (14 F): Days with min21619902
20 C (68 F): Tropical nights (min5420211
10 mm (0.39 in): Days with 10 mm or more rain71103199635
25 mm (0.98 in): Days with 25 mm or more rain7144199516
50 mm (1.97 in): Days with 50 mm or more rain711719961
100 mm (3.94 in): Days with 100 mm or more rain21219601
10 cm (3.9 in): Days with 10 cm or more snowfall38919691
25 cm (9.8 in): Days with 25 cm or more snowfall7219561

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1955.

Download the Data

  • Data for Detroit 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).