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Built 2026-10-19 (19 October 2026)

Knoxville Exp STN Threshold Days by Year (USC00404946)

17 fixed thresholds counted per year at Knoxville Exp STN (USC00404946): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Knoxville Exp STN Thresholds

  • Knoxville Exp STN: days with 10 mm (0.39 in) or more of precipitation in 56 years, most in 2018 with 69.
  • Knoxville Exp STN: days with 25 mm (0.98 in) or more of precipitation in 56 years, most in 2013 with 23.
  • Knoxville Exp STN: days with 50 mm (1.97 in) or more of precipitation in 46 years, most in 2020 with 9.
  • Knoxville Exp STN: days with a maximum temperature at or above 30 C (86 F) in 39 years, most in 2016 with 118.
  • 17 fixed thresholds have at least one qualifying day at Knoxville Exp STN.
39 years with a qualifying day
Days at or above 30 C (86 F) per year at Knoxville Exp STN Days per year at Knoxville Exp STN with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 118 in 2016. 0501001501983: 781986: 931988: 751989: 391990: 591991: 811992: 441993: 921994: 481995: 761996: 671997: 641998: 711999: 662000: 742001: 672002: 1112003: 522004: 452005: 932006: 522007: 1002008: 752009: 512010: 1052012: 772013: 472014: 682015: 802016: 1182017: 772018: 1132019: 1092020: 832021: 792022: 902023: 792024: 922025: 551983199019941998200220062010201520192023
Days per year at Knoxville Exp STN with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 118 in 2016.
Days at or above 30 C (86 F) per year at Knoxville Exp STN
YearDaysDecade average
19837871.3
19869371.3
19887571.3
19893971.3
19905966.8
19918166.8
19924466.8
19939266.8
19944866.8
19957666.8
19966766.8
19976466.8
19987166.8
19996666.8
20007472
20016772
200211172
20035272
20044572
20059372
20065272
200710072
20087572
20095172
201010588.2
20127788.2
20134788.2
20146888.2
20158088.2
201611888.2
20177788.2
201811388.2
201910988.2
20208379.7
20217979.7
20229079.7
20237979.7
20249279.7
20255579.7
First to last qualifying date each year at Knoxville Exp STN For each year, a bar from the first to the last day at Knoxville Exp STN meeting 30 C (86 F). 1983: 11 June 1983 to 3 October 19831986: 27 April 1986 to 5 October 19861988: 23 April 1988 to 24 September 19881989: 28 April 1989 to 14 September 19891990: 9 June 1990 to 13 September 19901991: 16 May 1991 to 19 September 19911992: 17 May 1992 to 18 September 19921993: 8 May 1993 to 27 September 19931994: 24 May 1994 to 17 September 19941995: 11 April 1995 to 14 September 19951996: 19 May 1996 to 8 September 19961997: 14 June 1997 to 21 September 19971998: 15 May 1998 to 30 September 19981999: 10 June 1999 to 28 September 19992000: 13 May 2000 to 21 September 20002001: 11 April 2001 to 13 September 20012002: 17 April 2002 to 4 October 20022003: 12 June 2003 to 23 September 20032004: 9 May 2004 to 29 August 20042005: 13 May 2005 to 6 October 20052006: 27 May 2006 to 19 September 20062007: 26 March 2007 to 9 October 20072008: 1 June 2008 to 15 September 20082009: 25 April 2009 to 26 September 20092010: 3 May 2010 to 25 September 20102012: 21 March 2012 to 7 September 20122013: 22 May 2013 to 13 September 20132014: 9 May 2014 to 12 September 20142015: 7 May 2015 to 21 September 20152016: 20 April 2016 to 31 October 20162017: 16 April 2017 to 8 October 20172018: 11 May 2018 to 10 October 20182019: 19 May 2019 to 8 October 20192020: 16 May 2020 to 14 September 20202021: 22 May 2021 to 1 October 20212022: 20 May 2022 to 22 September 20222023: 6 April 2023 to 5 October 20232024: 2 May 2024 to 24 September 20242025: 4 April 2025 to 23 August 202519831991199620012006201220172022JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Knoxville Exp STN meeting 30 C (86 F).
First to last qualifying date each year at Knoxville Exp STN
YearFirst dateLast date
19831983-06-111983-10-03
19861986-04-271986-10-05
19881988-04-231988-09-24
19891989-04-281989-09-14
19901990-06-091990-09-13
19911991-05-161991-09-19
19921992-05-171992-09-18
19931993-05-081993-09-27
19941994-05-241994-09-17
19951995-04-111995-09-14
19961996-05-191996-09-08
19971997-06-141997-09-21
19981998-05-151998-09-30
19991999-06-101999-09-28
20002000-05-132000-09-21
20012001-04-112001-09-13
20022002-04-172002-10-04
20032003-06-122003-09-23
20042004-05-092004-08-29
20052005-05-132005-10-06
20062006-05-272006-09-19
20072007-03-262007-10-09
20082008-06-012008-09-15
20092009-04-252009-09-26
20102010-05-032010-09-25
20122012-03-212012-09-07
20132013-05-222013-09-13
20142014-05-092014-09-12
20152015-05-072015-09-21
20162016-04-202016-10-31
20172017-04-162017-10-08
20182018-05-112018-10-10
20192019-05-192019-10-08
20202020-05-162020-09-14
20212021-05-222021-10-01
20222022-05-202022-09-22
20232023-04-062023-10-05
20242024-05-022024-09-24
20252025-04-042025-08-23

Every Fixed Threshold

Fixed thresholds at Knoxville Exp STN
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days39118201655
35 C (95 F): Days272720168
40 C (104 F): Days1120121
90 F (32.2 C): Days3993201638
100 F (37.8 C): Days4319833
0 C (32 F): Ice days (max371720109
0 C (32 F): Frost days (min39117198864
-10 C (14 F): Days with min351320157
-20 C (-4 F): Days with min5219832
20 C (68 F): Tropical nights (min3987201838
25 C (77 F): Days with min3120101
10 mm (0.39 in): Days with 10 mm or more rain5669201831
25 mm (0.98 in): Days with 25 mm or more rain562320137
50 mm (1.97 in): Days with 50 mm or more rain46920204
100 mm (3.94 in): Days with 100 mm or more rain6220192
10 cm (3.9 in): Days with 10 cm or more snowfall6120151
25 cm (9.8 in): Days with 25 cm or more snowfall1120241

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1983.

Download the Data

  • Data for Knoxville Exp STN 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).