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Congerville 2NW Weather Records (USC00111836)

Record envelope, standing records and threshold days for Congerville 2NW (USC00111836), Illinois, United States, with 37 years of record.

Key Facts for Congerville 2NW

  • Congerville 2NW (USC00111836) is a weather station in Illinois, United States at 40.62 latitude and -89.24 longitude, 195 m (640 ft) above sea level.
  • The station reports from 1990 to 2026, 37 years of record.
  • 1,464 records set at Congerville 2NW still stand.
  • Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Congerville 2NW tied a daily record high minimum temperature of 18.9 C (66.0 F) on 19 September 2026 (provisional).

Provisional Records

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

About the Station

  • Location: Illinois, United States, 40.62 latitude, -89.24 longitude.
  • Elevation: 195 m (640 ft).
  • Period of record: 1990 to 2026, 37 years.
  • Eligible elements: tmax, tmin, prcp, snow, snwd.

Daily Record Envelope and 2026

20 days at or beyond a record
Daily record high and record low at Congerville 2NW, with 2026 drawn through them The band shows the record high and record low for each calendar day at Congerville 2NW. The lines show the 2026 daily maximum and minimum. 20 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 Congerville 2NW. The lines show the 2026 daily maximum and minimum. 20 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Congerville 2NW, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan18.9 C (66.0 F)-37.8 C (-36.0 F)16.7 C (62.1 F)-24.4 C (-11.9 F)
Feb25.0 C (77.0 F)-30.6 C (-23.1 F)20.0 C (68.0 F)-21.7 C (-7.1 F)
Mar30.6 C (87.1 F)-21.1 C (-6.0 F)30.6 C (87.1 F)-12.8 C (9.0 F)
Apr32.2 C (90.0 F)-13.9 C (7.0 F)30.0 C (86.0 F)-2.2 C (28.0 F)
May35.6 C (96.1 F)-5.0 C (23.0 F)31.7 C (89.1 F)0.6 C (33.1 F)
Jun37.2 C (99.0 F)1.7 C (35.1 F)32.8 C (91.0 F)8.3 C (46.9 F)
Jul40.0 C (104.0 F)7.8 C (46.0 F)33.9 C (93.0 F)9.4 C (48.9 F)
Aug37.8 C (100.0 F)4.4 C (39.9 F)32.2 C (90.0 F)10.6 C (51.1 F)
Sep37.8 C (100.0 F)-1.1 C (30.0 F)36.1 C (97.0 F)13.9 C (57.0 F)
Oct33.9 C (93.0 F)-6.7 C (19.9 F)n/an/a
Nov27.8 C (82.0 F)-15.0 C (5.0 F)n/an/a
Dec22.2 C (72.0 F)-27.8 C (-18.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Congerville 2NW by the year they were set 1,464 records at Congerville 2NW still stand. 2018 holds the most, with 69. 0204060801996: 511997: 671998: 451999: 502000: 602001: 472002: 572003: 482004: 532005: 462006: 522007: 532008: 312009: 392010: 352011: 432012: 672013: 422014: 562015: 482016: 262017: 562018: 692019: 442020: 362021: 412022: 352023: 422024: 442025: 502026: 3119962000200420082012201620202024
1,464 records at Congerville 2NW still stand. 2018 holds the most, with 69.
Standing records at Congerville 2NW by the year they were set
Year setStanding records
199651
199767
199845
199950
200060
200147
200257
200348
200453
200546
200652
200753
200831
200939
201035
201143
201267
201342
201456
201548
201626
201756
201869
201944
202036
202141
202235
202342
202444
202550
202631

Wettest Day of Each Month

Jul: 125.0 mm (4.9 in)
Record daily precipitation for each month at Congerville 2NW The wettest day on record for each calendar month at Congerville 2NW. The most was 125.0 mm (4.9 in) on 16 July 2020. 050100150 Jan: 79.0 mm (3.1 in), 8 January 2008 Jan Feb: 41.9 mm (1.6 in), 27 February 1997 Feb Mar: 50.3 mm (2.0 in), 31 March 2022 Mar Apr: 73.2 mm (2.9 in), 4 April 2026 Apr May: 77.7 mm (3.1 in), 31 May 2008 May Jun: 85.6 mm (3.4 in), 18 June 2017 Jun Jul: 125.0 mm (4.9 in), 16 July 2020 Jul Aug: 81.0 mm (3.2 in), 27 August 1994 Aug Sep: 104.9 mm (4.1 in), 14 September 1993 Sep Oct: 76.7 mm (3.0 in), 31 October 2013 Oct Nov: 53.6 mm (2.1 in), 28 November 1990 Nov Dec: 41.4 mm (1.6 in), 15 December 2011 Dec
The wettest day on record for each calendar month at Congerville 2NW. The most was 125.0 mm (4.9 in) on 16 July 2020.
Record daily precipitation for each month at Congerville 2NW
MonthRecord daily precipitation (mm)Date
Jan79.0 mm (3.1 in)8 January 2008
Feb41.9 mm (1.6 in)27 February 1997
Mar50.3 mm (2.0 in)31 March 2022
Apr73.2 mm (2.9 in)4 April 2026
May77.7 mm (3.1 in)31 May 2008
Jun85.6 mm (3.4 in)18 June 2017
Jul125.0 mm (4.9 in)16 July 2020
Aug81.0 mm (3.2 in)27 August 1994
Sep104.9 mm (4.1 in)14 September 1993
Oct76.7 mm (3.0 in)31 October 2013
Nov53.6 mm (2.1 in)28 November 1990
Dec41.4 mm (1.6 in)15 December 2011

Period of Record Coverage

1996 to 2026
Days with data per year at Congerville 2NW 31 years of record at Congerville 2NW, 1996 to 2026. 3 years have data for under 90 percent of days and are left out of rankings: 1996, 2008, 2026. 1996: 264 of 366 days1997: 352 of 365 days1998: 352 of 365 days1999: 362 of 365 days2000: 350 of 366 days2001: 362 of 365 days2002: 358 of 365 days2003: 354 of 365 days2004: 358 of 366 days2005: 360 of 365 days2006: 349 of 365 days2007: 354 of 365 days2008: 328 of 366 days2009: 345 of 365 days2010: 354 of 365 days2011: 365 of 365 days2012: 361 of 366 days2013: 363 of 365 days2014: 363 of 365 days2015: 365 of 365 days2016: 365 of 366 days2017: 361 of 365 days2018: 362 of 365 days2019: 364 of 365 days2020: 342 of 366 days2021: 364 of 365 days2022: 365 of 365 days2023: 364 of 365 days2024: 366 of 366 days2025: 364 of 365 days2026: 249 of 365 days200020052010201520202025
31 years of record at Congerville 2NW, 1996 to 2026. 3 years have data for under 90 percent of days and are left out of rankings: 1996, 2008, 2026.
Days with data per year at Congerville 2NW
YearDays with dataShare of yearComplete
199626472%No
199735296%Yes
199835296%Yes
199936299%Yes
200035096%Yes
200136299%Yes
200235898%Yes
200335497%Yes
200435898%Yes
200536099%Yes
200634996%Yes
200735497%Yes
200832890%No
200934595%Yes
201035497%Yes
2011365100%Yes
201236199%Yes
201336399%Yes
201436399%Yes
2015365100%Yes
2016365100%Yes
201736199%Yes
201836299%Yes
2019364100%Yes
202034293%Yes
2021364100%Yes
2022365100%Yes
2023364100%Yes
2024366100%Yes
2025364100%Yes
202624968%No

Latest Records

20
Latest records at Congerville 2NW
DateStationRecordValueBeat old record byOld record stoodSignificance
19 September 2026Congerville 2NW, USdaily high min (Tie, Provisional)18.9 C (66.0 F)tie4 years1 of 100 (Routine)
5 September 2026Congerville 2NW, USdaily high max (Tie, Provisional)36.1 C (97.0 F)tie19 years2 of 100 (Routine)
4 September 2026Congerville 2NW, USdaily high max (Provisional)35.6 C (96.1 F)0.6 C (1.1 F)15 years8 of 100 (Routine)
4 September 2026Congerville 2NW, USdaily high min (Tie, Provisional)21.7 C (71.1 F)tie8 years1 of 100 (Routine)
16 August 2026Congerville 2NW, USdaily high min (Tie)21.1 C (70.0 F)tie19 years2 of 100 (Routine)
15 August 2026Congerville 2NW, USdaily rain56.9 mm (2.2 in)43.7 mm (1.7 in)1 year36 of 100 (Notable)
10 August 2026Congerville 2NW, USmonthly high min (Tie)25.0 C (77.0 F)tie15 years4 of 100 (Routine)
2 August 2026Congerville 2NW, USdaily low max21.1 C (70.0 F)0.6 C (1.1 F)16 years9 of 100 (Routine)
24 July 2026Congerville 2NW, USdaily low max24.4 C (75.9 F)1.2 C (2.2 F)21 years12 of 100 (Routine)
23 July 2026Congerville 2NW, USdaily low min9.4 C (48.9 F)2.3 C (4.1 F)25 years16 of 100 (Routine)
23 July 2026Congerville 2NW, USdaily low max23.9 C (75.0 F)0.5 C (0.9 F)8 years6 of 100 (Routine)
5 July 2026Congerville 2NW, USdaily rain26.7 mm (1.1 in)0.8 mm (0.03 in)16 years8 of 100 (Routine)
3 July 2026Congerville 2NW, USdaily high min22.2 C (72.0 F)1.1 C (2.0 F)25 years13 of 100 (Routine)
27 June 2026Congerville 2NW, USdaily low max20.0 C (68.0 F)1.1 C (2.0 F)11 years8 of 100 (Routine)
22 June 2026Congerville 2NW, USdaily low max18.9 C (66.0 F)2.8 C (5.0 F)7 years11 of 100 (Routine)
11 June 2026Congerville 2NW, USdaily rain82.0 mm (3.2 in)56.3 mm (2.2 in)11 years46 of 100 (Notable)
18 May 2026Congerville 2NW, USdaily high min (Tie)21.1 C (70.0 F)tie29 years2 of 100 (Routine)
7 May 2026Congerville 2NW, USdaily low min0.6 C (33.1 F)1.6 C (2.9 F)4 years7 of 100 (Routine)
30 April 2026Congerville 2NW, USdaily low min (Tie)0.6 C (33.1 F)tie27 years2 of 100 (Routine)
28 April 2026Congerville 2NW, USdaily rain52.8 mm (2.1 in)16.5 mm (0.6 in)27 years27 of 100 (Routine)

Climate Trend

27 complete years, 1997 to 2025
Annual mean temperature at Congerville 2NW as warming stripes, 1997 to 2025 One stripe for each of 27 complete years at Congerville 2NW, 1997 to 2025. Blue stripes are years cooler than the station's own mean of 10.8 C (51.5 F); red stripes are warmer. The coolest year was 2014, at 8.6 C (47.5 F), and the warmest was 2016, at 12.4 C (54.2 F). The strongest colour marks a difference of 2.3 C (4.1 F). 1997: 9.7 C, -1.2 C from the station mean1998: 12.0 C, +1.1 C from the station mean1999: 10.9 C, +0.1 C from the station mean2000: 10.5 C, -0.4 C from the station mean2001: 11.0 C, +0.2 C from the station mean2002: 10.6 C, -0.2 C from the station mean2003: 9.7 C, -1.1 C from the station mean2004: 10.2 C, -0.6 C from the station mean2005: 11.4 C, +0.5 C from the station mean2006: 11.6 C, +0.8 C from the station mean2007: 11.3 C, +0.4 C from the station mean2008: 9.2 C, -1.6 C from the station mean2009: 9.6 C, -1.2 C from the station mean2011: 10.6 C, -0.2 C from the station mean2012: 12.2 C, +1.3 C from the station mean2013: 9.6 C, -1.2 C from the station mean2014: 8.6 C, -2.2 C from the station mean2015: 11.0 C, +0.1 C from the station mean2016: 12.4 C, +1.5 C from the station mean2017: 12.1 C, +1.2 C from the station mean2018: 11.0 C, +0.2 C from the station mean2019: 10.5 C, -0.3 C from the station mean2021: 11.3 C, +0.5 C from the station mean2022: 10.3 C, -0.5 C from the station mean2023: 11.8 C, +1.0 C from the station mean2024: 12.1 C, +1.3 C from the station mean2025: 11.2 C, +0.4 C from the station mean1997200020052010201520202025
One stripe for each of 27 complete years at Congerville 2NW, 1997 to 2025. Blue stripes are years cooler than the station's own mean of 10.8 C (51.5 F); red stripes are warmer. The coolest year was 2014, at 8.6 C (47.5 F), and the warmest was 2016, at 12.4 C (54.2 F). The strongest colour marks a difference of 2.3 C (4.1 F).
Annual mean temperature at Congerville 2NW as warming stripes, 1997 to 2025
YearAnnual mean temperatureDifference from the station mean
19979.7 C-1.15 C
199812.0 C+1.12 C
199910.9 C+0.08 C
200010.5 C-0.35 C
200111.0 C+0.21 C
200210.6 C-0.22 C
20039.7 C-1.10 C
200410.2 C-0.60 C
200511.4 C+0.54 C
200611.6 C+0.76 C
200711.3 C+0.43 C
20089.2 C-1.64 C
20099.6 C-1.20 C
201110.6 C-0.23 C
201212.2 C+1.34 C
20139.6 C-1.19 C
20148.6 C-2.21 C
201511.0 C+0.15 C
201612.4 C+1.53 C
201712.1 C+1.23 C
201811.0 C+0.19 C
201910.5 C-0.29 C
202111.3 C+0.51 C
202210.3 C-0.53 C
202311.8 C+0.98 C
202412.1 C+1.27 C
202511.2 C+0.39 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

1990 to 2026
Yearly extremes at Congerville 2NW: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)40.0 C (104.0 F)201236.1 C (97.0 F)31
Coldest night (TNn)-37.8 C (-36.0 F)1999-24.4 C (-11.9 F)31
Wettest day (Rx1day)125.0 mm (4.9 in)202056.6 mm (2.2 in)37
Wettest five days (Rx5day)142.1 mm (5.6 in)202092.5 mm (3.6 in)37
Longest dry spell (CDD)42 days199919 days37

Hottest day (TXx)

Hottest day (TXx) at Congerville 2NW by year The hottest day of the year at Congerville 2NW, 1990 to 2026. The record is 40.0 C (104.0 F) in 2012, marked on the chart; the median year is 36.1 C (97.0 F). 32343638401990200020102020Record: 40.0 C (104.0 F) in 2012
The hottest day of the year at Congerville 2NW, 1990 to 2026. The record is 40.0 C (104.0 F) in 2012, marked on the chart; the median year is 36.1 C (97.0 F).
Hottest day (TXx) at Congerville 2NW by year
YearHottest day (TXx)
1990n/a
1991n/a
1992n/a
1993n/a
1994n/a
1995n/a
199635.0 C (95.0 F)
199737.2 C (99.0 F)
199835.6 C (96.1 F)
199936.7 C (98.1 F)
200035.6 C (96.1 F)
200136.7 C (98.1 F)
200236.1 C (97.0 F)
200336.7 C (98.1 F)
200433.3 C (91.9 F)
200538.3 C (100.9 F)
200635.0 C (95.0 F)
200736.1 C (97.0 F)
200832.8 C (91.0 F)
200935.6 C (96.1 F)
201035.0 C (95.0 F)
201137.8 C (100.0 F)
201240.0 C (104.0 F)
201337.2 C (99.0 F)
201434.4 C (93.9 F)
201536.1 C (97.0 F)
201634.4 C (93.9 F)
201736.1 C (97.0 F)
201835.6 C (96.1 F)
201934.4 C (93.9 F)
202035.0 C (95.0 F)
202134.4 C (93.9 F)
202236.1 C (97.0 F)
202337.8 C (100.0 F)
202436.1 C (97.0 F)
202535.6 C (96.1 F)
202636.1 C (97.0 F)

Coldest night (TNn)

Coldest night (TNn) at Congerville 2NW by year The coldest night of the year at Congerville 2NW, 1990 to 2026. The record is -37.8 C (-36.0 F) in 1999, marked on the chart; the median year is -24.4 C (-11.9 F). -40-30-20-101990200020102020Record: -37.8 C (-36.0 F) in 1999
The coldest night of the year at Congerville 2NW, 1990 to 2026. The record is -37.8 C (-36.0 F) in 1999, marked on the chart; the median year is -24.4 C (-11.9 F).
Coldest night (TNn) at Congerville 2NW by year
YearColdest night (TNn)
1990n/a
1991n/a
1992n/a
1993n/a
1994n/a
1995n/a
1996-17.2 C (1.0 F)
1997-26.7 C (-16.1 F)
1998-21.1 C (-6.0 F)
1999-37.8 C (-36.0 F)
2000-27.8 C (-18.0 F)
2001-25.0 C (-13.0 F)
2002-20.6 C (-5.1 F)
2003-26.1 C (-15.0 F)
2004-22.8 C (-9.0 F)
2005-21.7 C (-7.1 F)
2006-20.0 C (-4.0 F)
2007-22.8 C (-9.0 F)
2008-23.9 C (-11.0 F)
2009-31.7 C (-25.1 F)
2010-26.1 C (-15.0 F)
2011-26.7 C (-16.1 F)
2012-18.3 C (-0.9 F)
2013-19.4 C (-2.9 F)
2014-30.6 C (-23.1 F)
2015-24.4 C (-11.9 F)
2016-20.6 C (-5.1 F)
2017-23.3 C (-9.9 F)
2018-28.9 C (-20.0 F)
2019-29.4 C (-20.9 F)
2020-22.8 C (-9.0 F)
2021-25.6 C (-14.1 F)
2022-25.0 C (-13.0 F)
2023-17.2 C (1.0 F)
2024-26.1 C (-15.0 F)
2025-23.3 C (-9.9 F)
2026-24.4 C (-11.9 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Congerville 2NW by year The wettest day of the year at Congerville 2NW, 1990 to 2026. The record is 125.0 mm (4.9 in) in 2020, marked on the chart; the median year is 56.6 mm (2.2 in). 2550751001251990200020102020Record: 125.0 mm (4.9 in) in 2020
The wettest day of the year at Congerville 2NW, 1990 to 2026. The record is 125.0 mm (4.9 in) in 2020, marked on the chart; the median year is 56.6 mm (2.2 in).
Wettest day (Rx1day) at Congerville 2NW by year
YearWettest day (Rx1day)
199053.6 mm (2.1 in)
199156.6 mm (2.2 in)
199259.9 mm (2.4 in)
1993104.9 mm (4.1 in)
199481.0 mm (3.2 in)
199562.2 mm (2.4 in)
199650.8 mm (2.0 in)
199772.6 mm (2.9 in)
199833.5 mm (1.3 in)
199950.8 mm (2.0 in)
200057.2 mm (2.3 in)
200140.1 mm (1.6 in)
200266.0 mm (2.6 in)
200369.9 mm (2.8 in)
200454.4 mm (2.1 in)
200531.8 mm (1.3 in)
200647.0 mm (1.9 in)
200749.5 mm (1.9 in)
200895.0 mm (3.7 in)
200953.1 mm (2.1 in)
201046.5 mm (1.8 in)
201147.0 mm (1.9 in)
201247.0 mm (1.9 in)
201376.7 mm (3.0 in)
201456.9 mm (2.2 in)
201577.2 mm (3.0 in)
201666.8 mm (2.6 in)
201785.6 mm (3.4 in)
201853.3 mm (2.1 in)
201961.5 mm (2.4 in)
2020125.0 mm (4.9 in)
202158.9 mm (2.3 in)
202250.3 mm (2.0 in)
202343.4 mm (1.7 in)
202445.7 mm (1.8 in)
202547.2 mm (1.9 in)
202682.0 mm (3.2 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Congerville 2NW by year The wettest five days of the year at Congerville 2NW, 1990 to 2026. The record is 142.1 mm (5.6 in) in 2020, marked on the chart; the median year is 92.5 mm (3.6 in). 50751001251501990200020102020Record: 142.1 mm (5.6 in) in 2020
The wettest five days of the year at Congerville 2NW, 1990 to 2026. The record is 142.1 mm (5.6 in) in 2020, marked on the chart; the median year is 92.5 mm (3.6 in).
Wettest five days (Rx5day) at Congerville 2NW by year
YearWettest five days (Rx5day)
199070.9 mm (2.8 in)
199193.9 mm (3.7 in)
1992101.3 mm (4.0 in)
1993128.5 mm (5.1 in)
1994105.6 mm (4.2 in)
199596.6 mm (3.8 in)
199677.7 mm (3.1 in)
199787.6 mm (3.4 in)
199867.8 mm (2.7 in)
199996.0 mm (3.8 in)
200081.3 mm (3.2 in)
200169.0 mm (2.7 in)
2002100.5 mm (4.0 in)
2003109.0 mm (4.3 in)
200459.9 mm (2.4 in)
200554.6 mm (2.1 in)
200678.2 mm (3.1 in)
200776.3 mm (3.0 in)
2008127.3 mm (5.0 in)
200985.3 mm (3.4 in)
201074.9 mm (2.9 in)
201164.4 mm (2.5 in)
201260.2 mm (2.4 in)
2013127.0 mm (5.0 in)
201492.5 mm (3.6 in)
2015114.8 mm (4.5 in)
201688.4 mm (3.5 in)
2017103.4 mm (4.1 in)
201887.7 mm (3.5 in)
2019128.1 mm (5.0 in)
2020142.1 mm (5.6 in)
2021102.2 mm (4.0 in)
202261.7 mm (2.4 in)
202387.1 mm (3.4 in)
202495.0 mm (3.7 in)
2025101.1 mm (4.0 in)
2026125.5 mm (4.9 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Congerville 2NW by year The longest dry spell of the year at Congerville 2NW, 1990 to 2026. The record is 42 days in 1999, marked on the chart; the median year is 19 days. 10203040501990200020102020Record: 42 days in 1999
The longest dry spell of the year at Congerville 2NW, 1990 to 2026. The record is 42 days in 1999, marked on the chart; the median year is 19 days.
Longest dry spell (CDD) at Congerville 2NW by year
YearLongest dry spell (CDD)
199015 days
199116 days
199220 days
199321 days
199419 days
199527 days
199620 days
199713 days
199819 days
199942 days
200018 days
200116 days
200221 days
200316 days
200420 days
200524 days
200615 days
200717 days
200814 days
200914 days
201021 days
201115 days
201221 days
201316 days
201413 days
201520 days
201620 days
201718 days
201813 days
201918 days
202014 days
202122 days
202217 days
202321 days
202421 days
202532 days
202631 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 Congerville 2NW falls on 26 April and the median first autumn frost on 14 October, which leaves a median of 167 days between them.

Fitted over all years, the growing season changes by +6.2 days per decade at this station.

Frost dates and growing season at Congerville 2NW
MeasureMedian, all yearsEarliest periodRecent period (1997 to 2025)Recent against earliestFitted trend
Last spring frost26 Apriln/a26 Apriln/a-1.6 days per decade
First autumn frost14 Octobern/a14 Octobern/a+4.5 days per decade
Growing days167 daysn/a167 daysn/a+6.2 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

35 years, 1991 to 2025

A day with at least 55.9 mm (2.2 in) of rain is expected about once in 2 years. A day with at least 136.2 mm (5.4 in) of rain is expected about once in 100 years.

Rainfall return levels at Congerville 2NW: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years55.9 mm (2.2 in)
5 years72.7 mm (2.9 in)
10 years85.5 mm (3.4 in)
25 years103.9 mm (4.1 in)
50 years119.3 mm (4.7 in)Longer than the 35 years of record
100 years136.2 mm (5.4 in)Longer than the 35 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, 35 years of values from 1991 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: 125.0 mm (4.9 in) in 2020; 104.9 mm (4.1 in) in 1993; 95.0 mm (3.7 in) in 2008.

Download the Data

  • Data for Congerville 2NW standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Congerville 2NW 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). Records are computed by this site and are not official.

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