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Built 2026-10-19 (19 October 2026)

Shelbyville Dam Threshold Days by Year (USC00117876)

15 fixed thresholds counted per year at Shelbyville Dam (USC00117876): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Shelbyville Dam Thresholds

  • Shelbyville Dam: days with 10 mm (0.39 in) or more of precipitation in 37 years, most in 2009 with 45.
  • Shelbyville Dam: days with 25 mm (0.98 in) or more of precipitation in 37 years, most in 2003 with 14.
  • Shelbyville Dam: days with 50 mm (1.97 in) or more of precipitation in 32 years, most in 1941 with 4.
  • Shelbyville Dam: days with a maximum temperature at or above 30 C (86 F) in 29 years, most in 2007 with 80.
  • 15 fixed thresholds have at least one qualifying day at Shelbyville Dam.
29 years with a qualifying day
Days at or above 30 C (86 F) per year at Shelbyville Dam Days per year at Shelbyville Dam with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 80 in 2007. 0204060801979: 431981: 351984: 651985: 391997: 501998: 562001: 632002: 772003: 412004: 332005: 752006: 552007: 802009: 292010: 802011: 712012: 772013: 462014: 402015: 382016: 612017: 612018: 602019: 552022: 512023: 542024: 522025: 692026: 651979198520012004200720112014201720222025
Days per year at Shelbyville Dam with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 80 in 2007.
Days at or above 30 C (86 F) per year at Shelbyville Dam
YearDaysDecade average
19794343
19813546.3
19846546.3
19853946.3
19975053
19985653
20016356.6
20027756.6
20034156.6
20043356.6
20057556.6
20065556.6
20078056.6
20092956.6
20108058.9
20117158.9
20127758.9
20134658.9
20144058.9
20153858.9
20166158.9
20176158.9
20186058.9
20195558.9
20225158.2
20235458.2
20245258.2
20256958.2
20266558.2
First to last qualifying date each year at Shelbyville Dam For each year, a bar from the first to the last day at Shelbyville Dam meeting 30 C (86 F). 1979: 4 June 1979 to 11 September 19791981: 6 June 1981 to 30 September 19811984: 6 June 1984 to 13 September 19841985: 26 May 1985 to 20 September 19851997: 19 May 1997 to 9 October 19971998: 15 May 1998 to 29 September 19982001: 24 April 2001 to 14 September 20012002: 1 June 2002 to 3 October 20022003: 19 June 2003 to 29 August 20032004: 10 May 2004 to 24 September 20042005: 11 May 2005 to 6 October 20052006: 16 April 2006 to 5 October 20062007: 30 April 2007 to 9 October 20072009: 23 May 2009 to 28 August 20092010: 24 May 2010 to 11 October 20102011: 12 May 2011 to 14 September 20112012: 7 May 2012 to 6 September 20122013: 15 May 2013 to 5 October 20132014: 22 May 2014 to 6 September 20142015: 7 July 2015 to 19 September 20152016: 31 May 2016 to 7 October 20162017: 19 May 2017 to 27 September 20172018: 14 May 2018 to 9 October 20182019: 19 May 2019 to 3 October 20192022: 11 May 2022 to 22 September 20222023: 31 May 2023 to 4 October 20232024: 20 May 2024 to 6 October 20242025: 16 May 2025 to 4 October 20252026: 23 March 2026 to 14 October 202619791997200320072012201620222026JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Shelbyville Dam meeting 30 C (86 F).
First to last qualifying date each year at Shelbyville Dam
YearFirst dateLast date
19791979-06-041979-09-11
19811981-06-061981-09-30
19841984-06-061984-09-13
19851985-05-261985-09-20
19971997-05-191997-10-09
19981998-05-151998-09-29
20012001-04-242001-09-14
20022002-06-012002-10-03
20032003-06-192003-08-29
20042004-05-102004-09-24
20052005-05-112005-10-06
20062006-04-162006-10-05
20072007-04-302007-10-09
20092009-05-232009-08-28
20102010-05-242010-10-11
20112011-05-122011-09-14
20122012-05-072012-09-06
20132013-05-152013-10-05
20142014-05-222014-09-06
20152015-07-072015-09-19
20162016-05-312016-10-07
20172017-05-192017-09-27
20182018-05-142018-10-09
20192019-05-192019-10-03
20222022-05-112022-09-22
20232023-05-312023-10-04
20242024-05-202024-10-06
20252025-05-162025-10-04
20262026-03-232026-10-14

Every Fixed Threshold

Fixed thresholds at Shelbyville Dam
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days2980200765
35 C (95 F): Days2426201210
90 F (32.2 C): Days2952201238
100 F (37.8 C): Days31020123
0 C (32 F): Ice days (max2949201423
0 C (32 F): Frost days (min29140201362
-10 C (14 F): Days with min2948198521
-20 C (-4 F): Days with min201419792
20 C (68 F): Tropical nights (min2956201660
25 C (77 F): Days with min12320111
10 mm (0.39 in): Days with 10 mm or more rain3745200927
25 mm (0.98 in): Days with 25 mm or more rain371420039
50 mm (1.97 in): Days with 50 mm or more rain32419413
100 mm (3.94 in): Days with 100 mm or more rain5119791
10 cm (3.9 in): Days with 10 cm or more snowfall11320191

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1979.

Download the Data

  • Data for Shelbyville 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).