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Knox Wwtp Weather Records (USC00124657)

Record envelope, standing records and threshold days for Knox Wwtp (USC00124657), Indiana, United States, with 130 years of record.

Key Facts for Knox Wwtp

  • Knox Wwtp (USC00124657) is a weather station in Indiana, United States at 41.31 latitude and -86.63 longitude, 210 m (690 ft) above sea level.
  • The station reports from 1897 to 2026, 130 years of record.
  • 1,464 records set at Knox Wwtp still stand.
  • Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Knox Wwtp set a daily record precipitation of 29.0 mm (1.1 in) on 2 October 2026 (provisional).

Provisional Records

Records set in the last 60 days are provisional until they clear the revision window.

About the Station

  • Location: Indiana, United States, 41.31 latitude, -86.63 longitude.
  • Elevation: 210 m (690 ft).
  • Period of record: 1897 to 2026, 130 years.
  • Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

14 days at or beyond a record
Daily record high and record low at Knox Wwtp, with 2026 drawn through them The band shows the record high and record low for each calendar day at Knox Wwtp. The lines show the 2026 daily maximum and minimum. 14 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -40-2002040 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Knox Wwtp. The lines show the 2026 daily maximum and minimum. 14 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Knox Wwtp, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan18.9 C (66.0 F)-31.7 C (-25.1 F)16.7 C (62.1 F)-21.7 C (-7.1 F)
Feb21.7 C (71.1 F)-27.2 C (-17.0 F)17.8 C (64.0 F)-21.1 C (-6.0 F)
Mar29.4 C (84.9 F)-19.4 C (-2.9 F)25.6 C (78.1 F)-9.4 C (15.1 F)
Apr31.1 C (88.0 F)-11.1 C (12.0 F)27.8 C (82.0 F)-3.3 C (26.1 F)
May36.1 C (97.0 F)-4.4 C (24.1 F)28.9 C (84.0 F)-1.7 C (28.9 F)
Jun36.7 C (98.1 F)-0.6 C (30.9 F)31.1 C (88.0 F)8.9 C (48.0 F)
Jul37.8 C (100.0 F)5.6 C (42.1 F)32.2 C (90.0 F)10.0 C (50.0 F)
Aug36.7 C (98.1 F)3.9 C (39.0 F)28.9 C (84.0 F)10.0 C (50.0 F)
Sep35.6 C (96.1 F)-1.7 C (28.9 F)33.9 C (93.0 F)6.7 C (44.1 F)
Oct30.6 C (87.1 F)-6.7 C (19.9 F)27.8 C (82.0 F)6.1 C (43.0 F)
Nov25.6 C (78.1 F)-15.0 C (5.0 F)n/an/a
Dec18.9 C (66.0 F)-26.7 C (-16.1 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Knox Wwtp by the year they were set 1,464 records at Knox Wwtp still stand. 2014 holds the most, with 65. 0204060801897: 341898: 221905: 71906: 501907: 521908: 431909: 561910: 571911: 491912: 481913: 581914: 581915: 491916: 501917: 541918: 262006: 152007: 362008: 252009: 312010: 282011: 322012: 602013: 382014: 652015: 522016: 312017: 442018: 312019: 402020: 222021: 312022: 312023: 382024: 452025: 292026: 271897190719111915200620102014201820222026
1,464 records at Knox Wwtp still stand. 2014 holds the most, with 65.
Standing records at Knox Wwtp by the year they were set
Year setStanding records
189734
189822
19057
190650
190752
190843
190956
191057
191149
191248
191358
191458
191549
191650
191754
191826
200615
200736
200825
200931
201028
201132
201260
201338
201465
201552
201631
201744
201831
201940
202022
202131
202231
202338
202445
202529
202627

All-Time Record Progression

2 new records
When Knox Wwtp set new all-time records 2 all-time records were set at Knox Wwtp between 16 August 2016 and 15 March 2017. Each dot is a new record. Record daily precipitationRecord daily snowfall16 August 2016: Record daily precipitation 209.0 mm (8.2 in)15 March 2017: Record daily snowfall 27.4 cm (10.8 in)
2 all-time records were set at Knox Wwtp between 16 August 2016 and 15 March 2017. Each dot is a new record.
When Knox Wwtp set new all-time records
DateKindDetail
2016-08-16Record daily precipitationRecord daily precipitation 209.0 mm (8.2 in)
2017-03-15Record daily snowfallRecord daily snowfall 27.4 cm (10.8 in)

Wettest Day of Each Month

Aug: 209.0 mm (8.2 in)
Record daily precipitation for each month at Knox Wwtp The wettest day on record for each calendar month at Knox Wwtp. The most was 209.0 mm (8.2 in) on 16 August 2016. 0100200300 Jan: 58.4 mm (2.3 in), 8 January 2008 Jan Feb: 81.3 mm (3.2 in), 20 February 2018 Feb Mar: 44.7 mm (1.8 in), 8 March 2009 Mar Apr: 62.5 mm (2.5 in), 1 April 2026 Apr May: 111.0 mm (4.4 in), 19 May 1997 May Jun: 85.1 mm (3.4 in), 9 June 2026 Jun Jul: 153.7 mm (6.1 in), 18 July 1996 Jul Aug: 209.0 mm (8.2 in), 16 August 2016 Aug Sep: 96.5 mm (3.8 in), 15 September 2008 Sep Oct: 86.9 mm (3.4 in), 17 October 1993 Oct Nov: 75.9 mm (3.0 in), 13 November 1992 Nov Dec: 47.2 mm (1.9 in), 23 December 1907 Dec
The wettest day on record for each calendar month at Knox Wwtp. The most was 209.0 mm (8.2 in) on 16 August 2016.
Record daily precipitation for each month at Knox Wwtp
MonthRecord daily precipitation (mm)Date
Jan58.4 mm (2.3 in)8 January 2008
Feb81.3 mm (3.2 in)20 February 2018
Mar44.7 mm (1.8 in)8 March 2009
Apr62.5 mm (2.5 in)1 April 2026
May111.0 mm (4.4 in)19 May 1997
Jun85.1 mm (3.4 in)9 June 2026
Jul153.7 mm (6.1 in)18 July 1996
Aug209.0 mm (8.2 in)16 August 2016
Sep96.5 mm (3.8 in)15 September 2008
Oct86.9 mm (3.4 in)17 October 1993
Nov75.9 mm (3.0 in)13 November 1992
Dec47.2 mm (1.9 in)23 December 1907

Period of Record Coverage

1897 to 2026
Days with data per year at Knox Wwtp 37 years of record at Knox Wwtp, 1897 to 2026. 7 years have data for under 90 percent of days and are left out of rankings: 1897, 1898, 1905, 1917, 1918, 2006, 2026. 1897: 265 of 365 days1898: 119 of 365 days1905: 92 of 365 days1906: 364 of 365 days1907: 348 of 365 days1908: 363 of 366 days1909: 364 of 365 days1910: 363 of 365 days1911: 363 of 365 days1912: 359 of 366 days1913: 362 of 365 days1914: 365 of 365 days1915: 364 of 365 days1916: 364 of 366 days1917: 276 of 365 days1918: 116 of 365 days2006: 60 of 365 days2007: 352 of 365 days2008: 365 of 366 days2009: 352 of 365 days2010: 361 of 365 days2011: 331 of 365 days2012: 355 of 366 days2013: 359 of 365 days2014: 364 of 365 days2015: 352 of 365 days2016: 360 of 366 days2017: 356 of 365 days2018: 360 of 365 days2019: 358 of 365 days2020: 364 of 366 days2021: 365 of 365 days2022: 365 of 365 days2023: 365 of 365 days2024: 366 of 366 days2025: 365 of 365 days2026: 284 of 365 days1905191019152010201520202025
37 years of record at Knox Wwtp, 1897 to 2026. 7 years have data for under 90 percent of days and are left out of rankings: 1897, 1898, 1905, 1917, 1918, 2006, 2026.
Days with data per year at Knox Wwtp
YearDays with dataShare of yearComplete
189726573%No
189811933%No
19059225%No
1906364100%Yes
190734895%Yes
190836399%Yes
1909364100%Yes
191036399%Yes
191136399%Yes
191235998%Yes
191336299%Yes
1914365100%Yes
1915364100%Yes
191636499%Yes
191727676%No
191811632%No
20066016%No
200735296%Yes
2008365100%Yes
200935296%Yes
201036199%Yes
201133191%Yes
201235597%Yes
201335998%Yes
2014364100%Yes
201535296%Yes
201636098%Yes
201735698%Yes
201836099%Yes
201935898%Yes
202036499%Yes
2021365100%Yes
2022365100%Yes
2023365100%Yes
2024366100%Yes
2025365100%Yes
202628478%No

Latest Records

20
Latest records at Knox Wwtp
DateStationRecordValueBeat old record byOld record stoodSignificance
2 October 2026Knox Wwtp, USdaily rain (Provisional)29.0 mm (1.1 in)5.9 mm (0.23 in)16 years20 of 100 (Routine)
20 September 2026Knox Wwtp, USdaily rain (Provisional)32.0 mm (1.3 in)4.6 mm (0.18 in)108 years43 of 100 (Notable)
17 September 2026Knox Wwtp, USdaily high min (Provisional)20.6 C (69.1 F)1.7 C (3.1 F)119 years43 of 100 (Notable)
16 September 2026Knox Wwtp, USdaily high max (Provisional)32.2 C (90.0 F)0.5 C (0.9 F)4 years12 of 100 (Routine)
5 September 2026Knox Wwtp, USdaily high min (Provisional)23.3 C (73.9 F)2.2 C (4.0 F)8 years16 of 100 (Routine)
4 September 2026Knox Wwtp, USdaily high max (Provisional)33.9 C (93.0 F)2.8 C (5.0 F)13 years20 of 100 (Routine)
4 September 2026Knox Wwtp, USdaily high min (Provisional)23.3 C (73.9 F)2.7 C (4.9 F)8 years17 of 100 (Routine)
3 September 2026Knox Wwtp, USdaily high min (Provisional)22.8 C (73.0 F)1.1 C (2.0 F)8 years14 of 100 (Routine)
10 August 2026Knox Wwtp, USdaily rain22.6 mm (0.9 in)1.3 mm (0.05 in)112 years20 of 100 (Routine)
23 July 2026Knox Wwtp, USdaily low max (Tie)21.1 C (70.0 F)tie7 years3 of 100 (Routine)
2 July 2026Knox Wwtp, USdaily high min23.9 C (75.0 F)1.7 C (3.1 F)128 years44 of 100 (Notable)
1 July 2026Knox Wwtp, USdaily high min23.9 C (75.0 F)1.1 C (2.0 F)112 years43 of 100 (Notable)
30 June 2026Knox Wwtp, USmonthly high min (Tie)23.9 C (75.0 F)tie8 years5 of 100 (Routine)
29 June 2026Knox Wwtp, USdaily high min (Tie)22.2 C (72.0 F)tie12 years3 of 100 (Routine)
25 June 2026Knox Wwtp, USdaily low max22.2 C (72.0 F)0.6 C (1.1 F)117 years41 of 100 (Notable)
22 June 2026Knox Wwtp, USdaily low max (Tie)20.6 C (69.1 F)tie120 years10 of 100 (Routine)
9 June 2026Knox Wwtp, USmonthly rain85.1 mm (3.4 in)2.3 mm (0.09 in)114 years51 of 100 (Notable)
14 May 2026Knox Wwtp, USdaily low max12.8 C (55.0 F)1.6 C (2.9 F)7 years14 of 100 (Routine)
2 May 2026Knox Wwtp, USdaily low min-1.7 C (28.9 F)1.1 C (2.0 F)117 years42 of 100 (Notable)
18 April 2026Knox Wwtp, USdaily high max27.8 C (82.0 F)0.6 C (1.1 F)112 years40 of 100 (Notable)

Climate Trend

27 complete years, 1906 to 2025
Annual mean temperature at Knox Wwtp as warming stripes, 1906 to 2025 One stripe for each of 27 complete years at Knox Wwtp, 1906 to 2025. Blue stripes are years cooler than the station's own mean of 10.0 C (50.0 F); red stripes are warmer. The coolest year was 2014, at 7.9 C (46.1 F), and the warmest was 2024, at 11.5 C (52.8 F). The strongest colour marks a difference of 2.2 C (4.0 F). 1906: 10.5 C, +0.5 C from the station mean1908: 10.4 C, +0.4 C from the station mean1909: 9.7 C, -0.3 C from the station mean1910: 10.0 C, 0.0 C from the station mean1911: 10.6 C, +0.6 C from the station mean1912: 9.1 C, -0.9 C from the station mean1913: 10.7 C, +0.7 C from the station mean1914: 10.2 C, +0.2 C from the station mean1915: 9.7 C, -0.2 C from the station mean1916: 9.9 C, -0.1 C from the station mean2007: 9.9 C, -0.1 C from the station mean2008: 8.6 C, -1.4 C from the station mean2010: 9.8 C, -0.2 C from the station mean2012: 11.3 C, +1.3 C from the station mean2013: 9.0 C, -1.0 C from the station mean2014: 7.9 C, -2.1 C from the station mean2015: 9.6 C, -0.4 C from the station mean2016: 10.8 C, +0.8 C from the station mean2017: 10.7 C, +0.7 C from the station mean2018: 9.8 C, -0.1 C from the station mean2019: 9.6 C, -0.3 C from the station mean2020: 10.4 C, +0.5 C from the station mean2021: 10.5 C, +0.5 C from the station mean2022: 8.8 C, -1.2 C from the station mean2023: 10.7 C, +0.7 C from the station mean2024: 11.5 C, +1.6 C from the station mean2025: 9.8 C, -0.2 C from the station mean190619201930194019501960197019801990200020102020
One stripe for each of 27 complete years at Knox Wwtp, 1906 to 2025. Blue stripes are years cooler than the station's own mean of 10.0 C (50.0 F); red stripes are warmer. The coolest year was 2014, at 7.9 C (46.1 F), and the warmest was 2024, at 11.5 C (52.8 F). The strongest colour marks a difference of 2.2 C (4.0 F).
Annual mean temperature at Knox Wwtp as warming stripes, 1906 to 2025
YearAnnual mean temperatureDifference from the station mean
190610.5 C+0.53 C
190810.4 C+0.42 C
19099.7 C-0.30 C
191010.0 C-0.02 C
191110.6 C+0.65 C
19129.1 C-0.89 C
191310.7 C+0.71 C
191410.2 C+0.22 C
19159.7 C-0.23 C
19169.9 C-0.09 C
20079.9 C-0.07 C
20088.6 C-1.41 C
20109.8 C-0.17 C
201211.3 C+1.28 C
20139.0 C-0.97 C
20147.9 C-2.11 C
20159.6 C-0.36 C
201610.8 C+0.81 C
201710.7 C+0.69 C
20189.8 C-0.13 C
20199.6 C-0.34 C
202010.4 C+0.46 C
202110.5 C+0.51 C
20228.8 C-1.20 C
202310.7 C+0.73 C
202411.5 C+1.56 C
20259.8 C-0.16 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1897 to 2026
Yearly extremes at Knox Wwtp: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)37.8 C (100.0 F)191433.9 C (93.0 F)37
Coldest night (TNn)-31.7 C (-25.1 F)2009-22.8 C (-9.0 F)37
Wettest day (Rx1day)209.0 mm (8.2 in)201664.8 mm (2.6 in)52
Wettest five days (Rx5day)246.6 mm (9.7 in)201697.7 mm (3.8 in)52
Longest dry spell (CDD)30 days191015 days52

Hottest day (TXx)

Hottest day (TXx) at Knox Wwtp by year The hottest day of the year at Knox Wwtp, 1897 to 2026. The record is 37.8 C (100.0 F) in 1914, marked on the chart; the median year is 33.9 C (93.0 F). 20253035401900192019401960198020002020Record: 37.8 C (100.0 F) in 1914
The hottest day of the year at Knox Wwtp, 1897 to 2026. The record is 37.8 C (100.0 F) in 1914, marked on the chart; the median year is 33.9 C (93.0 F).
Hottest day (TXx) at Knox Wwtp by year
YearHottest day (TXx)
189737.2 C (99.0 F)
189836.7 C (98.1 F)
190528.3 C (82.9 F)
190633.9 C (93.0 F)
190735.6 C (96.1 F)
190834.4 C (93.9 F)
190933.3 C (91.9 F)
191036.1 C (97.0 F)
191136.1 C (97.0 F)
191232.2 C (90.0 F)
191335.0 C (95.0 F)
191437.8 C (100.0 F)
191531.7 C (89.1 F)
191637.2 C (99.0 F)
191736.1 C (97.0 F)
191825.0 C (77.0 F)
1991n/a
1992n/a
1993n/a
1994n/a
1995n/a
1996n/a
1997n/a
1998n/a
1999n/a
2000n/a
2001n/a
2002n/a
2003n/a
2004n/a
2005n/a
200622.2 C (72.0 F)
200732.8 C (91.0 F)
200832.2 C (90.0 F)
200932.8 C (91.0 F)
201033.3 C (91.9 F)
201135.6 C (96.1 F)
201237.8 C (100.0 F)
201335.6 C (96.1 F)
201432.8 C (91.0 F)
201531.7 C (89.1 F)
201633.3 C (91.9 F)
201733.9 C (93.0 F)
201835.0 C (95.0 F)
201932.8 C (91.0 F)
202033.9 C (93.0 F)
202131.7 C (89.1 F)
202235.0 C (95.0 F)
202333.3 C (91.9 F)
202433.9 C (93.0 F)
202532.8 C (91.0 F)
202633.9 C (93.0 F)

Coldest night (TNn)

Coldest night (TNn) at Knox Wwtp by year The coldest night of the year at Knox Wwtp, 1897 to 2026. The record is -31.7 C (-25.1 F) in 2009, marked on the chart; the median year is -22.8 C (-9.0 F). -35-30-25-20-151900192019401960198020002020Record: -31.7 C (-25.1 F) in 2009
The coldest night of the year at Knox Wwtp, 1897 to 2026. The record is -31.7 C (-25.1 F) in 2009, marked on the chart; the median year is -22.8 C (-9.0 F).
Coldest night (TNn) at Knox Wwtp by year
YearColdest night (TNn)
1897-21.1 C (-6.0 F)
1898-17.8 C (0.0 F)
1905-16.7 C (1.9 F)
1906-22.8 C (-9.0 F)
1907-18.9 C (-2.0 F)
1908-21.1 C (-6.0 F)
1909-24.4 C (-11.9 F)
1910-21.1 C (-6.0 F)
1911-18.3 C (-0.9 F)
1912-27.2 C (-17.0 F)
1913-20.6 C (-5.1 F)
1914-23.3 C (-9.9 F)
1915-26.7 C (-16.1 F)
1916-23.3 C (-9.9 F)
1917-25.0 C (-13.0 F)
1918-28.9 C (-20.0 F)
1991n/a
1992n/a
1993n/a
1994n/a
1995n/a
1996n/a
1997n/a
1998n/a
1999n/a
2000n/a
2001n/a
2002n/a
2003n/a
2004n/a
2005n/a
2006-16.1 C (3.0 F)
2007-24.4 C (-11.9 F)
2008-20.6 C (-5.1 F)
2009-31.7 C (-25.1 F)
2010-22.2 C (-8.0 F)
2011-26.7 C (-16.1 F)
2012-18.9 C (-2.0 F)
2013-21.1 C (-6.0 F)
2014-27.2 C (-17.0 F)
2015-23.9 C (-11.0 F)
2016-26.7 C (-16.1 F)
2017-22.2 C (-8.0 F)
2018-27.2 C (-17.0 F)
2019-29.4 C (-20.9 F)
2020-20.6 C (-5.1 F)
2021-23.3 C (-9.9 F)
2022-23.3 C (-9.9 F)
2023-17.2 C (1.0 F)
2024-23.9 C (-11.0 F)
2025-21.1 C (-6.0 F)
2026-21.7 C (-7.1 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Knox Wwtp by year The wettest day of the year at Knox Wwtp, 1897 to 2026. The record is 209.0 mm (8.2 in) in 2016, marked on the chart; the median year is 64.8 mm (2.6 in). 01002003001900192019401960198020002020Record: 209.0 mm (8.2 in) in 2016
The wettest day of the year at Knox Wwtp, 1897 to 2026. The record is 209.0 mm (8.2 in) in 2016, marked on the chart; the median year is 64.8 mm (2.6 in).
Wettest day (Rx1day) at Knox Wwtp by year
YearWettest day (Rx1day)
189750.8 mm (2.0 in)
189850.8 mm (2.0 in)
190529.0 mm (1.1 in)
190650.0 mm (2.0 in)
190751.3 mm (2.0 in)
190848.3 mm (1.9 in)
190946.0 mm (1.8 in)
191056.4 mm (2.2 in)
191182.8 mm (3.3 in)
191261.2 mm (2.4 in)
191377.5 mm (3.1 in)
191462.0 mm (2.4 in)
191555.4 mm (2.2 in)
191650.8 mm (2.0 in)
191755.1 mm (2.2 in)
191820.3 mm (0.8 in)
19918.6 mm (0.34 in)
199291.4 mm (3.6 in)
199386.9 mm (3.4 in)
199459.4 mm (2.3 in)
199573.7 mm (2.9 in)
1996153.7 mm (6.1 in)
1997111.0 mm (4.4 in)
199884.6 mm (3.3 in)
199931.0 mm (1.2 in)
200076.2 mm (3.0 in)
200157.4 mm (2.3 in)
200251.3 mm (2.0 in)
200369.9 mm (2.8 in)
200477.5 mm (3.1 in)
200541.9 mm (1.6 in)
2006165.9 mm (6.5 in)
2007108.5 mm (4.3 in)
2008111.0 mm (4.4 in)
200948.3 mm (1.9 in)
201064.8 mm (2.6 in)
201146.5 mm (1.8 in)
201250.8 mm (2.0 in)
201364.8 mm (2.6 in)
201460.2 mm (2.4 in)
201567.3 mm (2.6 in)
2016209.0 mm (8.2 in)
201774.2 mm (2.9 in)
201881.3 mm (3.2 in)
201992.7 mm (3.6 in)
202054.4 mm (2.1 in)
202181.0 mm (3.2 in)
202267.8 mm (2.7 in)
202374.2 mm (2.9 in)
2024111.8 mm (4.4 in)
202572.6 mm (2.9 in)
202685.1 mm (3.4 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Knox Wwtp by year The wettest five days of the year at Knox Wwtp, 1897 to 2026. The record is 246.6 mm (9.7 in) in 2016, marked on the chart; the median year is 97.7 mm (3.8 in). 01002003001900192019401960198020002020Record: 246.6 mm (9.7 in) in 2016
The wettest five days of the year at Knox Wwtp, 1897 to 2026. The record is 246.6 mm (9.7 in) in 2016, marked on the chart; the median year is 97.7 mm (3.8 in).
Wettest five days (Rx5day) at Knox Wwtp by year
YearWettest five days (Rx5day)
1897104.1 mm (4.1 in)
189876.2 mm (3.0 in)
190538.4 mm (1.5 in)
190677.9 mm (3.1 in)
190795.2 mm (3.7 in)
190874.4 mm (2.9 in)
190982.9 mm (3.3 in)
191065.0 mm (2.6 in)
1911104.1 mm (4.1 in)
191298.1 mm (3.9 in)
1913118.6 mm (4.7 in)
191460.2 mm (2.4 in)
191594.0 mm (3.7 in)
191686.5 mm (3.4 in)
191782.3 mm (3.2 in)
191830.5 mm (1.2 in)
19918.9 mm (0.35 in)
1992145.0 mm (5.7 in)
1993145.2 mm (5.7 in)
199483.0 mm (3.3 in)
199598.5 mm (3.9 in)
1996190.6 mm (7.5 in)
1997116.3 mm (4.6 in)
1998117.6 mm (4.6 in)
199964.8 mm (2.6 in)
200097.3 mm (3.8 in)
2001129.0 mm (5.1 in)
200284.1 mm (3.3 in)
2003150.4 mm (5.9 in)
2004109.5 mm (4.3 in)
200575.4 mm (3.0 in)
2006165.9 mm (6.5 in)
2007146.5 mm (5.8 in)
2008170.9 mm (6.7 in)
2009102.9 mm (4.1 in)
201093.7 mm (3.7 in)
201182.0 mm (3.2 in)
201250.9 mm (2.0 in)
201393.6 mm (3.7 in)
201482.0 mm (3.2 in)
2015129.3 mm (5.1 in)
2016246.6 mm (9.7 in)
2017106.7 mm (4.2 in)
2018164.5 mm (6.5 in)
2019104.4 mm (4.1 in)
202082.3 mm (3.2 in)
2021102.0 mm (4.0 in)
2022109.2 mm (4.3 in)
202376.2 mm (3.0 in)
2024137.2 mm (5.4 in)
202594.6 mm (3.7 in)
2026127.8 mm (5.0 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Knox Wwtp by year The longest dry spell of the year at Knox Wwtp, 1897 to 2026. The record is 30 days in 1910, marked on the chart; the median year is 15 days. 01020301900192019401960198020002020Record: 30 days in 1910
The longest dry spell of the year at Knox Wwtp, 1897 to 2026. The record is 30 days in 1910, marked on the chart; the median year is 15 days.
Longest dry spell (CDD) at Knox Wwtp by year
YearLongest dry spell (CDD)
189715 days
189812 days
190516 days
190611 days
190713 days
190826 days
190911 days
191030 days
191120 days
191210 days
191320 days
191415 days
191519 days
191619 days
191725 days
191815 days
19916 days
199212 days
199318 days
199414 days
199518 days
199620 days
199714 days
199818 days
199926 days
200015 days
200116 days
200217 days
200317 days
200416 days
200530 days
200616 days
200714 days
200815 days
200914 days
201016 days
201111 days
201215 days
201311 days
201413 days
201515 days
201612 days
201712 days
201811 days
201912 days
202017 days
202116 days
202215 days
202322 days
202418 days
202517 days
202613 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Frost Dates and Growing Season

27 years with a frost

Across 27 years with a frost, the median last spring frost at Knox Wwtp falls on 28 April and the median first autumn frost on 17 October, which leaves a median of 172 days between them.

Fitted over all years, the growing season changes by +0.8 days per decade at this station.

Frost dates and growing season at Knox Wwtp
MeasureMedian, all yearsEarliest periodRecent period (1906 to 2025)Recent against earliestFitted trend
Last spring frost28 Apriln/a28 Apriln/a-0.3 days per decade
First autumn frost17 Octobern/a17 Octobern/a+0.5 days per decade
Growing days172 daysn/a172 daysn/a+0.8 days per decade

A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.

Rainfall Return Levels

43 years, 1906 to 2025

A day with at least 66.5 mm (2.6 in) of rain is expected about once in 2 years. A day with at least 218.5 mm (8.6 in) of rain is expected about once in 100 years.

Rainfall return levels at Knox Wwtp: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years66.5 mm (2.6 in)
5 years92.8 mm (3.7 in)
10 years114.9 mm (4.5 in)
25 years149.5 mm (5.9 in)
50 years181.0 mm (7.1 in)Longer than the 43 years of record
100 years218.5 mm (8.6 in)Longer than the 43 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 43 years of values from 1906 to 2025.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 209.0 mm (8.2 in) in 2016; 165.9 mm (6.5 in) in 2006; 153.7 mm (6.1 in) in 1996.

Download the Data

  • Data for Knox Wwtp standing records by year: CSV or JSON. Field meanings are on the data page.
  • 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 2026-10-14 (14 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-14).