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Illinois City Dam 16 Weather Records (USC00114355)

Record envelope, standing records and threshold days for Illinois City Dam 16 (USC00114355), Illinois, United States, with 84 years of record.

Key Facts for Illinois City Dam 16

  • Illinois City Dam 16 (USC00114355) is a weather station in Illinois, United States at 41.43 latitude and -91.01 longitude, 168 m (550 ft) above sea level.
  • The station reports from 1943 to 2026, 84 years of record.
  • 1,464 records set at Illinois City Dam 16 still stand.
  • Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Illinois City Dam 16 set a daily record precipitation of 31.0 mm (1.2 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: Illinois, United States, 41.43 latitude, -91.01 longitude.
  • Elevation: 168 m (550 ft).
  • Period of record: 1943 to 2026, 84 years.
  • Eligible elements: prcp, snow, snwd.

Daily Record Envelope and 2026

40 days at or beyond a record
Daily record high and record low at Illinois City Dam 16, with 2026 drawn through them The band shows the record high and record low for each calendar day at Illinois City Dam 16. The lines show the 2026 daily maximum and minimum. 40 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 Illinois City Dam 16. The lines show the 2026 daily maximum and minimum. 40 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Illinois City Dam 16, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan17.8 C (64.0 F)-32.2 C (-26.0 F)14.4 C (57.9 F)-27.2 C (-17.0 F)
Feb23.9 C (75.0 F)-32.2 C (-26.0 F)21.7 C (71.1 F)-18.9 C (-2.0 F)
Mar30.6 C (87.1 F)-24.4 C (-11.9 F)30.0 C (86.0 F)-15.0 C (5.0 F)
Apr31.7 C (89.1 F)-8.9 C (16.0 F)29.4 C (84.9 F)-5.6 C (21.9 F)
May36.1 C (97.0 F)-5.0 C (23.0 F)33.3 C (91.9 F)-1.7 C (28.9 F)
Jun36.7 C (98.1 F)4.4 C (39.9 F)35.0 C (95.0 F)11.1 C (52.0 F)
Jul38.3 C (100.9 F)9.4 C (48.9 F)33.9 C (93.0 F)10.0 C (50.0 F)
Aug38.9 C (102.0 F)5.0 C (41.0 F)31.1 C (88.0 F)8.9 C (48.0 F)
Sep37.2 C (99.0 F)1.1 C (34.0 F)36.1 C (97.0 F)5.6 C (42.1 F)
Oct35.0 C (95.0 F)-4.4 C (24.1 F)28.3 C (82.9 F)3.9 C (39.0 F)
Nov26.1 C (79.0 F)-15.0 C (5.0 F)n/an/a
Dec22.8 C (73.0 F)-24.4 C (-11.9 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Illinois City Dam 16 by the year they were set 1,464 records at Illinois City Dam 16 still stand. 1947 holds the most, with 90. 02550751001943: 271944: 611945: 781946: 551947: 901948: 141966: 41971: 31978: 31979: 12004: 422005: 352006: 572007: 422008: 232009: 472010: 292011: 502012: 772013: 672014: 682015: 572016: 452017: 692018: 592019: 522020: 362021: 482022: 432023: 322024: 522025: 472026: 51194319471978200620102014201820222026
1,464 records at Illinois City Dam 16 still stand. 1947 holds the most, with 90.
Standing records at Illinois City Dam 16 by the year they were set
Year setStanding records
194327
194461
194578
194655
194790
194814
19664
19713
19783
19791
200442
200535
200657
200742
200823
200947
201029
201150
201277
201367
201468
201557
201645
201769
201859
201952
202036
202148
202243
202332
202452
202547
202651

All-Time Record Progression

7 new records
When Illinois City Dam 16 set new all-time records 7 all-time records were set at Illinois City Dam 16 between 13 January 1979 and 2 February 2011. Each dot is a new record. Record daily snowfallRecord snow depth13 January 1979: Record daily snowfall 30.5 cm (12.0 in)13 January 1979: Record snow depth 40.6 cm (16.0 in)14 January 1979: Record snow depth 68.6 cm (27.0 in)19 January 1979: Record snow depth 73.7 cm (29.0 in)24 January 1979: Record snow depth 78.7 cm (31.0 in)3 January 1999: Record daily snowfall 35.6 cm (14.0 in)2 February 2011: Record daily snowfall 50.8 cm (20.0 in)1980198519901995200020052010
7 all-time records were set at Illinois City Dam 16 between 13 January 1979 and 2 February 2011. Each dot is a new record.
When Illinois City Dam 16 set new all-time records
DateKindDetail
1979-01-13Record daily snowfallRecord daily snowfall 30.5 cm (12.0 in)
1979-01-13Record snow depthRecord snow depth 40.6 cm (16.0 in)
1979-01-14Record snow depthRecord snow depth 68.6 cm (27.0 in)
1979-01-19Record snow depthRecord snow depth 73.7 cm (29.0 in)
1979-01-24Record snow depthRecord snow depth 78.7 cm (31.0 in)
1999-01-03Record daily snowfallRecord daily snowfall 35.6 cm (14.0 in)
2011-02-02Record daily snowfallRecord daily snowfall 50.8 cm (20.0 in)

Wettest Day of Each Month

Jun: 205.7 mm (8.1 in)
Record daily precipitation for each month at Illinois City Dam 16 The wettest day on record for each calendar month at Illinois City Dam 16. The most was 205.7 mm (8.1 in) on 7 June 1967. 0100200300 Jan: 47.2 mm (1.9 in), 12 January 1960 Jan Feb: 44.5 mm (1.8 in), 9 February 2001 Feb Mar: 88.1 mm (3.5 in), 5 March 1976 Mar Apr: 167.4 mm (6.6 in), 24 April 1965 Apr May: 95.3 mm (3.8 in), 10 May 1996 May Jun: 205.7 mm (8.1 in), 7 June 1967 Jun Jul: 115.8 mm (4.6 in), 11 July 1971 Jul Aug: 88.9 mm (3.5 in), 8 August 1982 Aug Sep: 110.0 mm (4.3 in), 22 September 1970 Sep Oct: 85.1 mm (3.4 in), 20 October 1962 Oct Nov: 61.0 mm (2.4 in), 17 November 1952 Nov Dec: 55.4 mm (2.2 in), 15 December 1971 Dec
The wettest day on record for each calendar month at Illinois City Dam 16. The most was 205.7 mm (8.1 in) on 7 June 1967.
Record daily precipitation for each month at Illinois City Dam 16
MonthRecord daily precipitation (mm)Date
Jan47.2 mm (1.9 in)12 January 1960
Feb44.5 mm (1.8 in)9 February 2001
Mar88.1 mm (3.5 in)5 March 1976
Apr167.4 mm (6.6 in)24 April 1965
May95.3 mm (3.8 in)10 May 1996
Jun205.7 mm (8.1 in)7 June 1967
Jul115.8 mm (4.6 in)11 July 1971
Aug88.9 mm (3.5 in)8 August 1982
Sep110.0 mm (4.3 in)22 September 1970
Oct85.1 mm (3.4 in)20 October 1962
Nov61.0 mm (2.4 in)17 November 1952
Dec55.4 mm (2.2 in)15 December 1971

Period of Record Coverage

1943 to 2026
Days with data per year at Illinois City Dam 16 33 years of record at Illinois City Dam 16, 1943 to 2026. 9 years have data for under 90 percent of days and are left out of rankings: 1943, 1948, 1966, 1971, 1978, 1979, 2004, 2010 and others. 1943: 213 of 365 days1944: 365 of 366 days1945: 358 of 365 days1946: 353 of 365 days1947: 356 of 365 days1948: 148 of 366 days1966: 28 of 365 days1971: 11 of 365 days1978: 31 of 365 days1979: 28 of 365 days2004: 268 of 366 days2005: 342 of 365 days2006: 344 of 365 days2007: 343 of 365 days2008: 336 of 366 days2009: 347 of 365 days2010: 316 of 365 days2011: 355 of 365 days2012: 365 of 366 days2013: 365 of 365 days2014: 360 of 365 days2015: 365 of 365 days2016: 366 of 366 days2017: 361 of 365 days2018: 351 of 365 days2019: 347 of 365 days2020: 362 of 366 days2021: 362 of 365 days2022: 361 of 365 days2023: 362 of 365 days2024: 362 of 366 days2025: 362 of 365 days2026: 267 of 365 days194520052010201520202025
33 years of record at Illinois City Dam 16, 1943 to 2026. 9 years have data for under 90 percent of days and are left out of rankings: 1943, 1948, 1966, 1971, 1978, 1979, 2004, 2010 and others.
Days with data per year at Illinois City Dam 16
YearDays with dataShare of yearComplete
194321358%No
1944365100%Yes
194535898%Yes
194635397%Yes
194735698%Yes
194814840%No
1966288%No
1971113%No
1978318%No
1979288%No
200426873%No
200534294%Yes
200634494%Yes
200734394%Yes
200833692%Yes
200934795%Yes
201031687%No
201135597%Yes
2012365100%Yes
2013365100%Yes
201436099%Yes
2015365100%Yes
2016366100%Yes
201736199%Yes
201835196%Yes
201934795%Yes
202036299%Yes
202136299%Yes
202236199%Yes
202336299%Yes
202436299%Yes
202536299%Yes
202626773%No

Latest Records

20
Latest records at Illinois City Dam 16
DateStationRecordValueBeat old record byOld record stoodSignificance
2 October 2026Illinois City Dam 16, USdaily rain (Provisional)31.0 mm (1.2 in)0.5 mm (0.02 in)16 years13 of 100 (Routine)
1 October 2026Illinois City Dam 16, USdaily rain (Provisional)54.1 mm (2.1 in)21.8 mm (0.9 in)48 years40 of 100 (Notable)
16 September 2026Illinois City Dam 16, USdaily rain (Provisional)35.6 mm (1.4 in)12.7 mm (0.5 in)43 years28 of 100 (Routine)
14 August 2026Illinois City Dam 16, USdaily rain36.3 mm (1.4 in)7.9 mm (0.31 in)80 years37 of 100 (Notable)
1 August 2026Illinois City Dam 16, USdaily rain68.6 mm (2.7 in)18.3 mm (0.7 in)69 years41 of 100 (Notable)
18 June 2026Illinois City Dam 16, USdaily rain64.3 mm (2.5 in)5.9 mm (0.23 in)76 years33 of 100 (Routine)
11 June 2026Illinois City Dam 16, USdaily rain50.8 mm (2.0 in)27.7 mm (1.1 in)71 years47 of 100 (Notable)
10 April 2026Illinois City Dam 16, USdaily rain21.8 mm (0.9 in)2.0 mm (0.08 in)12 years12 of 100 (Routine)
9 January 2026Illinois City Dam 16, USdaily rain25.1 mm (1.0 in)5.3 mm (0.21 in)80 years42 of 100 (Notable)
3 December 2025Illinois City Dam 16, USdaily snow depth (Tie)12.7 cm (5.0 in)tie60 years6 of 100 (Routine)
2 December 2025Illinois City Dam 16, USdaily snow depth (Tie)12.7 cm (5.0 in)tie51 years5 of 100 (Routine)
30 November 2025Illinois City Dam 16, USmonthly snow depth27.9 cm (11.0 in)10.1 cm (4.0 in)66 years66 of 100 (Major)
30 November 2025Illinois City Dam 16, USdaily snowfall (Tie)15.2 cm (6.0 in)tie51 years5 of 100 (Routine)
11 August 2025Illinois City Dam 16, USmonthly rain (Tie)88.9 mm (3.5 in)tie43 years7 of 100 (Routine)
10 August 2025Illinois City Dam 16, USdaily rain47.0 mm (1.9 in)2.0 mm (0.08 in)32 years18 of 100 (Routine)
26 July 2025Illinois City Dam 16, USdaily rain59.7 mm (2.4 in)10.2 mm (0.4 in)32 years24 of 100 (Routine)
20 July 2025Illinois City Dam 16, USdaily rain33.3 mm (1.3 in)7.6 mm (0.30 in)67 years33 of 100 (Routine)
12 July 2025Illinois City Dam 16, USdaily rain76.2 mm (3.0 in)54.9 mm (2.2 in)10 years50 of 100 (Notable)
4 June 2025Illinois City Dam 16, USdaily rain35.6 mm (1.4 in)3.8 mm (0.15 in)16 years15 of 100 (Routine)
21 May 2025Illinois City Dam 16, USdaily rain56.4 mm (2.2 in)29.2 mm (1.1 in)66 years53 of 100 (Notable)

Climate Trend

19 complete years, 1944 to 2025
Annual mean temperature at Illinois City Dam 16 as warming stripes, 1944 to 2025 One stripe for each of 19 complete years at Illinois City Dam 16, 1944 to 2025. Blue stripes are years cooler than the station's own mean of 10.7 C (51.2 F); red stripes are warmer. The coolest year was 2014, at 8.4 C (47.1 F), and the warmest was 2012, at 12.2 C (54.0 F). The strongest colour marks a difference of 2.3 C (4.1 F). 1944: 10.7 C, 0.0 C from the station mean1945: 9.9 C, -0.8 C from the station mean1946: 11.8 C, +1.1 C from the station mean1947: 10.6 C, -0.1 C from the station mean2011: 10.8 C, +0.1 C from the station mean2012: 12.2 C, +1.6 C from the station mean2013: 9.6 C, -1.1 C from the station mean2014: 8.4 C, -2.3 C from the station mean2015: 10.4 C, -0.2 C from the station mean2016: 11.6 C, +0.9 C from the station mean2017: 11.1 C, +0.4 C from the station mean2018: 9.9 C, -0.8 C from the station mean2019: 9.9 C, -0.8 C from the station mean2020: 10.9 C, +0.2 C from the station mean2021: 11.3 C, +0.6 C from the station mean2022: 10.1 C, -0.6 C from the station mean2023: 11.4 C, +0.7 C from the station mean2024: 11.8 C, +1.2 C from the station mean2025: 10.8 C, +0.1 C from the station mean194419501960197019801990200020102020
One stripe for each of 19 complete years at Illinois City Dam 16, 1944 to 2025. Blue stripes are years cooler than the station's own mean of 10.7 C (51.2 F); red stripes are warmer. The coolest year was 2014, at 8.4 C (47.1 F), and the warmest was 2012, at 12.2 C (54.0 F). The strongest colour marks a difference of 2.3 C (4.1 F).
Annual mean temperature at Illinois City Dam 16 as warming stripes, 1944 to 2025
YearAnnual mean temperatureDifference from the station mean
194410.7 C+0.04 C
19459.9 C-0.79 C
194611.8 C+1.10 C
194710.6 C-0.07 C
201110.8 C+0.06 C
201212.2 C+1.55 C
20139.6 C-1.14 C
20148.4 C-2.30 C
201510.4 C-0.25 C
201611.6 C+0.86 C
201711.1 C+0.41 C
20189.9 C-0.81 C
20199.9 C-0.78 C
202010.9 C+0.16 C
202111.3 C+0.62 C
202210.1 C-0.59 C
202311.4 C+0.66 C
202411.8 C+1.15 C
202510.8 C+0.06 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

1943 to 2026
Yearly extremes at Illinois City Dam 16: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)38.9 C (102.0 F)194735.6 C (96.1 F)33
Coldest night (TNn)-32.2 C (-26.0 F)2009-22.8 C (-9.0 F)34
Wettest day (Rx1day)205.7 mm (8.1 in)196761.1 mm (2.4 in)84
Wettest five days (Rx5day)258.7 mm (10.2 in)196793.0 mm (3.7 in)84
Longest dry spell (CDD)55 days195222 days84

Hottest day (TXx)

Hottest day (TXx) at Illinois City Dam 16 by year The hottest day of the year at Illinois City Dam 16, 1943 to 2026. The record is 38.9 C (102.0 F) in 1947, marked on the chart; the median year is 35.6 C (96.1 F). 102030401960198020002020Record: 38.9 C (102.0 F) in 1947
The hottest day of the year at Illinois City Dam 16, 1943 to 2026. The record is 38.9 C (102.0 F) in 1947, marked on the chart; the median year is 35.6 C (96.1 F).
Hottest day (TXx) at Illinois City Dam 16 by year
YearHottest day (TXx)
194335.0 C (95.0 F)
194435.0 C (95.0 F)
194537.8 C (100.0 F)
194635.6 C (96.1 F)
194738.9 C (102.0 F)
194831.1 C (88.0 F)
1949n/a
1950n/a
1951n/a
1952n/a
1953n/a
1954n/a
1955n/a
1956n/a
1957n/a
1958n/a
1959n/a
1960n/a
1961n/a
1962n/a
1963n/a
1964n/a
1965n/a
196611.7 C (53.1 F)
1967n/a
1968n/a
1969n/a
1970n/a
197125.0 C (77.0 F)
1972n/a
1973n/a
1974n/a
1975n/a
1976n/a
1977n/a
197833.3 C (91.9 F)
197932.2 C (90.0 F)
1980n/a
1981n/a
1982n/a
1983n/a
1984n/a
1985n/a
1986n/a
1987n/a
1988n/a
1989n/a
1990n/a
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
200433.3 C (91.9 F)
200537.8 C (100.0 F)
200637.2 C (99.0 F)
200735.0 C (95.0 F)
200835.0 C (95.0 F)
200935.6 C (96.1 F)
201034.4 C (93.9 F)
201137.8 C (100.0 F)
201238.3 C (100.9 F)
201337.8 C (100.0 F)
201434.4 C (93.9 F)
201535.6 C (96.1 F)
201634.4 C (93.9 F)
201735.0 C (95.0 F)
201836.1 C (97.0 F)
201935.6 C (96.1 F)
202036.1 C (97.0 F)
202135.6 C (96.1 F)
202237.2 C (99.0 F)
202337.8 C (100.0 F)
202435.6 C (96.1 F)
202534.4 C (93.9 F)
202636.1 C (97.0 F)

Coldest night (TNn)

Coldest night (TNn) at Illinois City Dam 16 by year The coldest night of the year at Illinois City Dam 16, 1943 to 2026. The record is -32.2 C (-26.0 F) in 2009, marked on the chart; the median year is -22.8 C (-9.0 F). -40-200201960198020002020Record: -32.2 C (-26.0 F) in 2009
The coldest night of the year at Illinois City Dam 16, 1943 to 2026. The record is -32.2 C (-26.0 F) in 2009, marked on the chart; the median year is -22.8 C (-9.0 F).
Coldest night (TNn) at Illinois City Dam 16 by year
YearColdest night (TNn)
1943-18.9 C (-2.0 F)
1944-21.7 C (-7.1 F)
1945-25.6 C (-14.1 F)
1946-20.6 C (-5.1 F)
1947-28.9 C (-20.0 F)
1948-21.7 C (-7.1 F)
1949n/a
1950n/a
1951n/a
1952n/a
1953n/a
1954n/a
19550.6 C (33.1 F)
1956n/a
1957n/a
1958n/a
1959n/a
1960n/a
1961n/a
1962n/a
1963n/a
1964n/a
1965n/a
1966-17.2 C (1.0 F)
1967n/a
1968n/a
1969n/a
1970n/a
1971-7.2 C (19.0 F)
1972n/a
1973n/a
1974n/a
1975n/a
1976n/a
1977n/a
197810.0 C (50.0 F)
19794.4 C (39.9 F)
1980n/a
1981n/a
1982n/a
1983n/a
1984n/a
1985n/a
1986n/a
1987n/a
1988n/a
1989n/a
1990n/a
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
2004-21.1 C (-6.0 F)
2005-22.2 C (-8.0 F)
2006-21.7 C (-7.1 F)
2007-22.8 C (-9.0 F)
2008-23.3 C (-9.9 F)
2009-32.2 C (-26.0 F)
2010-27.2 C (-17.0 F)
2011-26.7 C (-16.1 F)
2012-16.1 C (3.0 F)
2013-24.4 C (-11.9 F)
2014-31.1 C (-24.0 F)
2015-25.6 C (-14.1 F)
2016-24.4 C (-11.9 F)
2017-20.6 C (-5.1 F)
2018-29.4 C (-20.9 F)
2019-32.2 C (-26.0 F)
2020-21.1 C (-6.0 F)
2021-24.4 C (-11.9 F)
2022-22.8 C (-9.0 F)
2023-18.9 C (-2.0 F)
2024-28.3 C (-18.9 F)
2025-23.9 C (-11.0 F)
2026-27.2 C (-17.0 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Illinois City Dam 16 by year The wettest day of the year at Illinois City Dam 16, 1943 to 2026. The record is 205.7 mm (8.1 in) in 1967, marked on the chart; the median year is 61.1 mm (2.4 in). 0501001502002501960198020002020Record: 205.7 mm (8.1 in) in 1967
The wettest day of the year at Illinois City Dam 16, 1943 to 2026. The record is 205.7 mm (8.1 in) in 1967, marked on the chart; the median year is 61.1 mm (2.4 in).
Wettest day (Rx1day) at Illinois City Dam 16 by year
YearWettest day (Rx1day)
194366.0 mm (2.6 in)
194446.5 mm (1.8 in)
194552.8 mm (2.1 in)
194665.5 mm (2.6 in)
1947102.9 mm (4.1 in)
194876.5 mm (3.0 in)
194965.8 mm (2.6 in)
195058.4 mm (2.3 in)
195145.7 mm (1.8 in)
195269.1 mm (2.7 in)
195340.9 mm (1.6 in)
195469.9 mm (2.8 in)
195554.9 mm (2.2 in)
195650.3 mm (2.0 in)
195737.8 mm (1.5 in)
195849.0 mm (1.9 in)
195946.5 mm (1.8 in)
196047.5 mm (1.9 in)
196180.8 mm (3.2 in)
196285.1 mm (3.4 in)
196350.0 mm (2.0 in)
196462.2 mm (2.4 in)
1965167.4 mm (6.6 in)
196657.9 mm (2.3 in)
1967205.7 mm (8.1 in)
196844.2 mm (1.7 in)
196943.4 mm (1.7 in)
1970110.0 mm (4.3 in)
1971115.8 mm (4.6 in)
197276.7 mm (3.0 in)
197381.0 mm (3.2 in)
197438.1 mm (1.5 in)
197536.8 mm (1.4 in)
197688.1 mm (3.5 in)
197776.7 mm (3.0 in)
197834.3 mm (1.4 in)
197957.7 mm (2.3 in)
198064.8 mm (2.6 in)
198150.3 mm (2.0 in)
198297.8 mm (3.9 in)
198362.2 mm (2.4 in)
198479.5 mm (3.1 in)
198561.7 mm (2.4 in)
198619.6 mm (0.8 in)
198735.8 mm (1.4 in)
198855.9 mm (2.2 in)
198953.8 mm (2.1 in)
1990121.9 mm (4.8 in)
199145.7 mm (1.8 in)
199263.5 mm (2.5 in)
199376.5 mm (3.0 in)
199436.3 mm (1.4 in)
199544.2 mm (1.7 in)
199695.3 mm (3.8 in)
199741.9 mm (1.6 in)
199864.8 mm (2.6 in)
199971.4 mm (2.8 in)
200077.5 mm (3.1 in)
200161.0 mm (2.4 in)
200255.4 mm (2.2 in)
200349.0 mm (1.9 in)
200457.9 mm (2.3 in)
200532.8 mm (1.3 in)
200637.6 mm (1.5 in)
200776.7 mm (3.0 in)
200875.7 mm (3.0 in)
200973.7 mm (2.9 in)
201043.9 mm (1.7 in)
201135.1 mm (1.4 in)
201261.2 mm (2.4 in)
201371.1 mm (2.8 in)
2014106.7 mm (4.2 in)
201587.6 mm (3.4 in)
201674.2 mm (2.9 in)
201755.9 mm (2.2 in)
201866.0 mm (2.6 in)
201953.3 mm (2.1 in)
202052.3 mm (2.1 in)
202145.2 mm (1.8 in)
202262.0 mm (2.4 in)
202338.4 mm (1.5 in)
202450.8 mm (2.0 in)
202588.9 mm (3.5 in)
202668.6 mm (2.7 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Illinois City Dam 16 by year The wettest five days of the year at Illinois City Dam 16, 1943 to 2026. The record is 258.7 mm (10.2 in) in 1967, marked on the chart; the median year is 93.0 mm (3.7 in). 01002003001960198020002020Record: 258.7 mm (10.2 in) in 1967
The wettest five days of the year at Illinois City Dam 16, 1943 to 2026. The record is 258.7 mm (10.2 in) in 1967, marked on the chart; the median year is 93.0 mm (3.7 in).
Wettest five days (Rx5day) at Illinois City Dam 16 by year
YearWettest five days (Rx5day)
194383.2 mm (3.3 in)
194465.7 mm (2.6 in)
194565.5 mm (2.6 in)
194684.1 mm (3.3 in)
1947104.9 mm (4.1 in)
194882.1 mm (3.2 in)
194984.4 mm (3.3 in)
195092.9 mm (3.7 in)
195190.4 mm (3.6 in)
1952114.6 mm (4.5 in)
195381.2 mm (3.2 in)
1954137.8 mm (5.4 in)
195598.1 mm (3.9 in)
195684.4 mm (3.3 in)
195776.7 mm (3.0 in)
195872.7 mm (2.9 in)
1959123.8 mm (4.9 in)
196088.7 mm (3.5 in)
1961154.9 mm (6.1 in)
196287.2 mm (3.4 in)
196373.1 mm (2.9 in)
196494.0 mm (3.7 in)
1965201.5 mm (7.9 in)
1966102.3 mm (4.0 in)
1967258.7 mm (10.2 in)
196879.3 mm (3.1 in)
196978.5 mm (3.1 in)
1970151.1 mm (5.9 in)
1971126.0 mm (5.0 in)
1972109.9 mm (4.3 in)
1973144.0 mm (5.7 in)
1974100.4 mm (4.0 in)
197555.6 mm (2.2 in)
1976105.2 mm (4.1 in)
1977147.6 mm (5.8 in)
197858.9 mm (2.3 in)
197971.6 mm (2.8 in)
1980102.6 mm (4.0 in)
1981121.3 mm (4.8 in)
1982144.8 mm (5.7 in)
198373.2 mm (2.9 in)
1984146.1 mm (5.8 in)
1985116.3 mm (4.6 in)
198627.7 mm (1.1 in)
198756.2 mm (2.2 in)
198870.7 mm (2.8 in)
1989125.9 mm (5.0 in)
1990171.2 mm (6.7 in)
199160.3 mm (2.4 in)
199299.6 mm (3.9 in)
1993126.3 mm (5.0 in)
199449.8 mm (2.0 in)
199575.9 mm (3.0 in)
1996146.1 mm (5.8 in)
199769.4 mm (2.7 in)
199893.0 mm (3.7 in)
199995.5 mm (3.8 in)
2000102.9 mm (4.1 in)
200192.2 mm (3.6 in)
200277.8 mm (3.1 in)
200370.9 mm (2.8 in)
200466.8 mm (2.6 in)
200538.6 mm (1.5 in)
200651.9 mm (2.0 in)
2007126.0 mm (5.0 in)
2008113.4 mm (4.5 in)
200993.2 mm (3.7 in)
201081.5 mm (3.2 in)
201154.6 mm (2.1 in)
201299.1 mm (3.9 in)
201387.6 mm (3.4 in)
2014142.6 mm (5.6 in)
201590.2 mm (3.6 in)
201682.8 mm (3.3 in)
2017123.4 mm (4.9 in)
2018124.1 mm (4.9 in)
2019113.3 mm (4.5 in)
2020110.6 mm (4.4 in)
202184.6 mm (3.3 in)
202278.5 mm (3.1 in)
202376.5 mm (3.0 in)
202495.9 mm (3.8 in)
2025152.1 mm (6.0 in)
2026124.0 mm (4.9 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Illinois City Dam 16 by year The longest dry spell of the year at Illinois City Dam 16, 1943 to 2026. The record is 55 days in 1952, marked on the chart; the median year is 22 days. 02040601960198020002020Record: 55 days in 1952
The longest dry spell of the year at Illinois City Dam 16, 1943 to 2026. The record is 55 days in 1952, marked on the chart; the median year is 22 days.
Longest dry spell (CDD) at Illinois City Dam 16 by year
YearLongest dry spell (CDD)
194327 days
194427 days
194521 days
194621 days
194721 days
194830 days
194923 days
195029 days
195112 days
195255 days
195323 days
195419 days
195522 days
195624 days
195722 days
195826 days
195920 days
196014 days
196115 days
196217 days
196322 days
196420 days
196520 days
196626 days
196723 days
196818 days
196932 days
197016 days
197124 days
197215 days
197319 days
197425 days
197514 days
197626 days
197719 days
197820 days
197924 days
198020 days
198124 days
198218 days
198325 days
198427 days
198517 days
198631 days
198715 days
198837 days
198933 days
199016 days
199133 days
199216 days
199324 days
199422 days
199525 days
199621 days
199718 days
199823 days
199937 days
200018 days
200114 days
200222 days
200328 days
200421 days
200517 days
200622 days
200730 days
200815 days
200927 days
201020 days
201125 days
201217 days
201342 days
201420 days
201523 days
201623 days
201726 days
201817 days
201913 days
202020 days
202127 days
202231 days
202328 days
202422 days
202519 days
202626 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.

Rainfall Return Levels

80 years, 1944 to 2025

A day with at least 59.2 mm (2.3 in) of rain is expected about once in 2 years. A day with at least 169.0 mm (6.7 in) of rain is expected about once in 100 years.

Rainfall return levels at Illinois City Dam 16: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years59.2 mm (2.3 in)
5 years81.2 mm (3.2 in)
10 years98.3 mm (3.9 in)
25 years123.4 mm (4.9 in)
50 years144.9 mm (5.7 in)
100 years169.0 mm (6.7 in)Longer than the 80 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, 80 years of values from 1944 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: 205.7 mm (8.1 in) in 1967; 167.4 mm (6.6 in) in 1965; 121.9 mm (4.8 in) in 1990.

Download the Data

  • Data for Illinois City Dam 16 standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Illinois City Dam 16 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 2026-10-13 (13 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-13).