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Built 2026-10-18 (18 October 2026)

Knox Wwtp Threshold Days by Year

17 fixed thresholds counted per year at Knox Wwtp (USC00124657): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Knox Wwtp Thresholds

  • Knox Wwtp: days with 10 mm (0.39 in) or more of precipitation in 44 years, most in 1909 with 44.
  • Knox Wwtp: days with 25 mm (0.98 in) or more of precipitation in 44 years, most in 1909 with 17.
  • Knox Wwtp: days with 50 mm (1.97 in) or more of precipitation in 38 years, most in 2008 with 5.
  • Knox Wwtp: days with a maximum temperature at or above 30 C (86 F) in 31 years, most in 2012 with 56.
  • 17 fixed thresholds have at least one qualifying day at Knox Wwtp.
31 years with a qualifying day
Days at or above 30 C (86 F) per year at Knox Wwtp Days per year at Knox Wwtp with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 56 in 2012. 02040601906: 451907: 81908: 401909: 191910: 371911: 401912: 201913: 431914: 521915: 121916: 452007: 402008: 112009: 102010: 382011: 372012: 562013: 252014: 122015: 112016: 332017: 262018: 352019: 232020: 372021: 202022: 232023: 222024: 242025: 302026: 2019061910191420082012201620202024
Days per year at Knox Wwtp with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 56 in 2012.
Days at or above 30 C (86 F) per year at Knox Wwtp
YearDaysDecade average
19064528
1907828
19084028
19091928
19103735.6
19114035.6
19122035.6
19134335.6
19145235.6
19151235.6
19164535.6
20074020.3
20081120.3
20091020.3
20103829.6
20113729.6
20125629.6
20132529.6
20141229.6
20151129.6
20163329.6
20172629.6
20183529.6
20192329.6
20203725.1
20212025.1
20222325.1
20232225.1
20242425.1
20253025.1
20262025.1
First to last qualifying date each year at Knox Wwtp For each year, a bar from the first to the last day at Knox Wwtp meeting 30 C (86 F). 1906: 16 May 1906 to 18 September 19061907: 17 June 1907 to 1 September 19071908: 25 May 1908 to 26 September 19081909: 24 June 1909 to 28 August 19091910: 16 June 1910 to 30 August 19101911: 15 May 1911 to 2 September 19111912: 23 May 1912 to 10 September 19121913: 6 June 1913 to 7 September 19131914: 25 May 1914 to 21 September 19141915: 25 April 1915 to 14 September 19151916: 25 May 1916 to 7 September 19162007: 2 May 2007 to 9 October 20072008: 9 June 2008 to 3 September 20082009: 24 June 2009 to 16 August 20092010: 24 May 2010 to 24 September 20102011: 11 May 2011 to 25 August 20112012: 4 May 2012 to 5 September 20122013: 15 May 2013 to 12 September 20132014: 8 May 2014 to 6 September 20142015: 11 June 2015 to 9 September 20152016: 25 May 2016 to 8 September 20162017: 17 May 2017 to 27 September 20172018: 2 May 2018 to 4 October 20182019: 27 June 2019 to 2 October 20192020: 25 May 2020 to 5 September 20202021: 25 May 2021 to 28 September 20212022: 11 May 2022 to 29 August 20222023: 31 May 2023 to 6 September 20232024: 21 May 2024 to 22 September 20242025: 16 May 2025 to 17 August 20252026: 9 June 2026 to 13 October 202619061910191420082012201620202024JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Knox Wwtp meeting 30 C (86 F).
First to last qualifying date each year at Knox Wwtp
YearFirst dateLast date
19061906-05-161906-09-18
19071907-06-171907-09-01
19081908-05-251908-09-26
19091909-06-241909-08-28
19101910-06-161910-08-30
19111911-05-151911-09-02
19121912-05-231912-09-10
19131913-06-061913-09-07
19141914-05-251914-09-21
19151915-04-251915-09-14
19161916-05-251916-09-07
20072007-05-022007-10-09
20082008-06-092008-09-03
20092009-06-242009-08-16
20102010-05-242010-09-24
20112011-05-112011-08-25
20122012-05-042012-09-05
20132013-05-152013-09-12
20142014-05-082014-09-06
20152015-06-112015-09-09
20162016-05-252016-09-08
20172017-05-172017-09-27
20182018-05-022018-10-04
20192019-06-272019-10-02
20202020-05-252020-09-05
20212021-05-252021-09-28
20222022-05-112022-08-29
20232023-05-312023-09-06
20242024-05-212024-09-22
20252025-05-162025-08-17
20262026-06-092026-10-13

Every Fixed Threshold

Fixed thresholds at Knox Wwtp
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days3156201220
35 C (95 F): Days111220122
90 F (32.2 C): Days283720125
100 F (37.8 C): Days2119141
0 C (32 F): Ice days (max3173201428
0 C (32 F): Frost days (min31151202277
-10 C (14 F): Days with min3162201421
-20 C (-4 F): Days with min271920145
-30 C (-22 F): Days with min1220092
20 C (68 F): Tropical nights (min3131191328
10 mm (0.39 in): Days with 10 mm or more rain4444190936
25 mm (0.98 in): Days with 25 mm or more rain4417190912
50 mm (1.97 in): Days with 50 mm or more rain38520082
100 mm (3.94 in): Days with 100 mm or more rain7119961
200 mm (7.87 in): Days with 200 mm or more rain1120161
10 cm (3.9 in): Days with 10 cm or more snowfall27720081
25 cm (9.8 in): Days with 25 cm or more snowfall1120171

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1906.

Download the Data

  • Data for Knox Wwtp 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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2026-10-16).