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Built 2026-10-19 (19 October 2026)

Illinois City Dam 16 Threshold Days by Year (USC00114355)

18 fixed thresholds counted per year at Illinois City Dam 16 (USC00114355): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Illinois City Dam 16 Thresholds

  • Illinois City Dam 16: days with 10 mm (0.39 in) or more of precipitation in 81 years, most in 1982 with 39.
  • Illinois City Dam 16: days with 25 mm (0.98 in) or more of precipitation in 81 years, most in 1993 with 21.
  • Illinois City Dam 16: days with 10 cm (3.9 in) or more of snowfall in 60 years, most in 1972 with 5.
  • Illinois City Dam 16: days with 50 mm (1.97 in) or more of precipitation in 58 years, most in 1954 with 5.
  • 18 fixed thresholds have at least one qualifying day at Illinois City Dam 16.
25 years with a qualifying day
Days at or above 30 C (86 F) per year at Illinois City Dam 16 Days per year at Illinois City Dam 16 with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 68 in 2007. 0204060801944: 501945: 341946: 411947: 542005: 582006: 482007: 682008: 292009: 222011: 492012: 662013: 542014: 372015: 312016: 522017: 472018: 522019: 452020: 462021: 562022: 412023: 492024: 452025: 542026: 44194419472007201120142017202020232026
Days per year at Illinois City Dam 16 with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 68 in 2007.
Days at or above 30 C (86 F) per year at Illinois City Dam 16
YearDaysDecade average
19445044.8
19453444.8
19464144.8
19475444.8
20055845
20064845
20076845
20082945
20092245
20114948.1
20126648.1
20135448.1
20143748.1
20153148.1
20165248.1
20174748.1
20185248.1
20194548.1
20204647.9
20215647.9
20224147.9
20234947.9
20244547.9
20255447.9
20264447.9
First to last qualifying date each year at Illinois City Dam 16 For each year, a bar from the first to the last day at Illinois City Dam 16 meeting 30 C (86 F). 1944: 15 May 1944 to 3 September 19441945: 17 March 1945 to 9 September 19451946: 7 June 1946 to 26 September 19461947: 9 June 1947 to 15 October 19472005: 6 June 2005 to 5 October 20052006: 24 May 2006 to 3 October 20062007: 29 April 2007 to 7 October 20072008: 1 June 2008 to 1 September 20082009: 21 May 2009 to 15 August 20092011: 10 May 2011 to 12 September 20112012: 16 May 2012 to 13 September 20122013: 2 May 2013 to 20 September 20132014: 8 May 2014 to 30 September 20142015: 5 June 2015 to 18 September 20152016: 7 May 2016 to 18 October 20162017: 16 May 2017 to 26 September 20172018: 25 May 2018 to 4 October 20182019: 25 May 2019 to 2 October 20192020: 26 May 2020 to 7 September 20202021: 2 May 2021 to 1 October 20212022: 10 May 2022 to 21 September 20222023: 8 May 2023 to 5 October 20232024: 13 May 2024 to 12 October 20242025: 15 May 2025 to 5 October 20252026: 22 March 2026 to 9 September 20261944200520092014201820222026JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Illinois City Dam 16 meeting 30 C (86 F).
First to last qualifying date each year at Illinois City Dam 16
YearFirst dateLast date
19441944-05-151944-09-03
19451945-03-171945-09-09
19461946-06-071946-09-26
19471947-06-091947-10-15
20052005-06-062005-10-05
20062006-05-242006-10-03
20072007-04-292007-10-07
20082008-06-012008-09-01
20092009-05-212009-08-15
20112011-05-102011-09-12
20122012-05-162012-09-13
20132013-05-022013-09-20
20142014-05-082014-09-30
20152015-06-052015-09-18
20162016-05-072016-10-18
20172017-05-162017-09-26
20182018-05-252018-10-04
20192019-05-252019-10-02
20202020-05-262020-09-07
20212021-05-022021-10-01
20222022-05-102022-09-21
20232023-05-082023-10-05
20242024-05-132024-10-12
20252025-05-152025-10-05
20262026-03-222026-09-09

Every Fixed Threshold

Fixed thresholds at Illinois City Dam 16
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days2568200744
35 C (95 F): Days221819473
90 F (32.2 C): Days2540201217
100 F (37.8 C): Days7420121
0 C (32 F): Ice days (max2567201422
0 C (32 F): Frost days (min19154201877
-10 C (14 F): Days with min1968201428
-20 C (-4 F): Days with min172120148
-30 C (-22 F): Days with min2220192
20 C (68 F): Tropical nights (min1941194723
25 C (77 F): Days with min6219472
10 mm (0.39 in): Days with 10 mm or more rain8139198234
25 mm (0.98 in): Days with 25 mm or more rain8121199316
50 mm (1.97 in): Days with 50 mm or more rain58519546
100 mm (3.94 in): Days with 100 mm or more rain7119471
200 mm (7.87 in): Days with 200 mm or more rain1119671
10 cm (3.9 in): Days with 10 cm or more snowfall60519721
25 cm (9.8 in): Days with 25 cm or more snowfall3119991

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1944.

Download the Data

  • Data for Illinois City Dam 16 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).