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Built 2026-10-18 (18 October 2026)

Monticello (River) Weather Records (USC00115792)

Record envelope, standing records and threshold days for Monticello (River) (USC00115792), Illinois, United States, with 46 years of record.

Key Facts for Monticello (River)

  • Monticello (River) (USC00115792) is a weather station in Illinois, United States at 40.04 latitude and -88.59 longitude, 189 m (620 ft) above sea level.
  • The station reports from 1964 to 2009, 46 years of record.
  • 0 records set at Monticello (River) still stand.
  • Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
  • Monticello (River) set a daily record precipitation of 16.8 mm (0.7 in) on 20 June 2009.

About the Station

  • Location: Illinois, United States, 40.04 latitude, -88.59 longitude.
  • Elevation: 189 m (620 ft).
  • Period of record: 1964 to 2009, 46 years.
  • Eligible elements: prcp, snow, snwd.

Daily Record Envelope and 2026

0 days at or beyond a record
Daily record high and record low at Monticello (River), with 2026 drawn through them The band shows the record high and record low for each calendar day at Monticello (River). The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. 000111 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Monticello (River). The lines show the 2026 daily maximum and minimum. 0 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Monticello (River), with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
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Which Years Hold Standing Records

0 standing records
Standing records at Monticello (River) by the year they were set 0 records at Monticello (River) still stand. 00000000000
0 records at Monticello (River) still stand.
Standing records at Monticello (River) by the year they were set
Year setStanding records

All-Time Record Progression

2 new records
When Monticello (River) set new all-time records 2 all-time records were set at Monticello (River) between 2 January 1999 and 3 January 1999. Each dot is a new record. Record daily snowfallRecord snow depth2 January 1999: Record daily snowfall 30.5 cm (12.0 in)3 January 1999: Record snow depth 55.9 cm (22.0 in)2000
2 all-time records were set at Monticello (River) between 2 January 1999 and 3 January 1999. Each dot is a new record.
When Monticello (River) set new all-time records
DateKindDetail
1999-01-02Record daily snowfallRecord daily snowfall 30.5 cm (12.0 in)
1999-01-03Record snow depthRecord snow depth 55.9 cm (22.0 in)

Wettest Day of Each Month

Jul: 127.0 mm (5.0 in)
Record daily precipitation for each month at Monticello (River) The wettest day on record for each calendar month at Monticello (River). The most was 127.0 mm (5.0 in) on 5 July 1971. 050100150 Jan: 53.8 mm (2.1 in), 29 January 1982 Jan Feb: 50.3 mm (2.0 in), 14 February 1990 Feb Mar: 42.2 mm (1.7 in), 28 March 1998 Mar Apr: 76.2 mm (3.0 in), 12 April 1979 Apr May: 111.3 mm (4.4 in), 15 May 1990 May Jun: 116.6 mm (4.6 in), 23 June 1974 Jun Jul: 127.0 mm (5.0 in), 5 July 1971 Jul Aug: 108.7 mm (4.3 in), 13 August 1999 Aug Sep: 113.3 mm (4.5 in), 15 September 2008 Sep Oct: 101.1 mm (4.0 in), 21 October 1983 Oct Nov: 61.0 mm (2.4 in), 18 November 1985 Nov Dec: 54.6 mm (2.1 in), 7 December 1966 Dec
The wettest day on record for each calendar month at Monticello (River). The most was 127.0 mm (5.0 in) on 5 July 1971.
Record daily precipitation for each month at Monticello (River)
MonthRecord daily precipitation (mm)Date
Jan53.8 mm (2.1 in)29 January 1982
Feb50.3 mm (2.0 in)14 February 1990
Mar42.2 mm (1.7 in)28 March 1998
Apr76.2 mm (3.0 in)12 April 1979
May111.3 mm (4.4 in)15 May 1990
Jun116.6 mm (4.6 in)23 June 1974
Jul127.0 mm (5.0 in)5 July 1971
Aug108.7 mm (4.3 in)13 August 1999
Sep113.3 mm (4.5 in)15 September 2008
Oct101.1 mm (4.0 in)21 October 1983
Nov61.0 mm (2.4 in)18 November 1985
Dec54.6 mm (2.1 in)7 December 1966

Latest Records

20
Latest records at Monticello (River)
DateStationRecordValueBeat old record byOld record stoodSignificance
20 June 2009Monticello (River), USdaily rain16.8 mm (0.7 in)5.6 mm (0.22 in)35 years17 of 100 (Routine)
14 May 2009Monticello (River), USdaily rain48.8 mm (1.9 in)28.2 mm (1.1 in)28 years34 of 100 (Routine)
13 May 2009Monticello (River), USdaily rain26.2 mm (1.0 in)0.3 mm (0.01 in)7 years6 of 100 (Routine)
3 April 2009Monticello (River), USdaily rain20.3 mm (0.8 in)7.6 mm (0.30 in)15 years14 of 100 (Routine)
29 March 2009Monticello (River), USdaily rain21.3 mm (0.8 in)0.2 mm (0.01 in)2 years4 of 100 (Routine)
28 December 2008Monticello (River), USdaily rain38.1 mm (1.5 in)2.0 mm (0.08 in)18 years11 of 100 (Routine)
24 December 2008Monticello (River), USdaily rain24.1 mm (0.9 in)4.3 mm (0.17 in)26 years15 of 100 (Routine)
19 December 2008Monticello (River), USdaily rain34.3 mm (1.4 in)18.6 mm (0.7 in)35 years34 of 100 (Routine)
24 October 2008Monticello (River), USdaily rain38.1 mm (1.5 in)15.2 mm (0.6 in)22 years23 of 100 (Routine)
15 September 2008Monticello (River), USmonthly rain113.3 mm (4.5 in)2.3 mm (0.09 in)38 years26 of 100 (Routine)
5 September 2008Monticello (River), USdaily rain79.2 mm (3.1 in)64.0 mm (2.5 in)39 years55 of 100 (Notable)
4 September 2008Monticello (River), USdaily rain26.7 mm (1.1 in)11.2 mm (0.4 in)42 years23 of 100 (Routine)
9 July 2008Monticello (River), USdaily rain43.2 mm (1.7 in)23.1 mm (0.9 in)7 years20 of 100 (Routine)
7 July 2008Monticello (River), USdaily rain55.9 mm (2.2 in)17.3 mm (0.7 in)33 years23 of 100 (Routine)
8 June 2008Monticello (River), USdaily rain13.7 mm (0.5 in)0.7 mm (0.03 in)34 years14 of 100 (Routine)
29 February 2008Monticello (River), USdaily snowfall2.5 cm (1.0 in)2.5 cm (1.0 in)40 years20 of 100 (Routine)
29 February 2008Monticello (River), USdaily rain2.0 mm (0.08 in)2.0 mm (0.08 in)40 years18 of 100 (Routine)
29 February 2008Monticello (River), USdaily snow depth (Tie)2.5 cm (1.0 in)tie28 years3 of 100 (Routine)
6 February 2008Monticello (River), USdaily rain47.5 mm (1.9 in)37.6 mm (1.5 in)33 years54 of 100 (Notable)
1 February 2008Monticello (River), USdaily snowfall16.3 cm (6.4 in)8.7 cm (3.4 in)42 years37 of 100 (Notable)

Extremes by Year

1964 to 2009
Yearly extremes at Monticello (River): the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Wettest day (Rx1day)127.0 mm (5.0 in)197165.5 mm (2.6 in)43
Wettest five days (Rx5day)204.9 mm (8.1 in)2003105.7 mm (4.2 in)43
Longest dry spell (CDD)39 days198820 days43

Wettest day (Rx1day)

Wettest day (Rx1day) at Monticello (River) by year The wettest day of the year at Monticello (River), 1964 to 2009. The record is 127.0 mm (5.0 in) in 1971, marked on the chart; the median year is 65.5 mm (2.6 in). 0501001501970198019902000Record: 127.0 mm (5.0 in) in 1971
The wettest day of the year at Monticello (River), 1964 to 2009. The record is 127.0 mm (5.0 in) in 1971, marked on the chart; the median year is 65.5 mm (2.6 in).
Wettest day (Rx1day) at Monticello (River) by year
YearWettest day (Rx1day)
19649.7 mm (0.38 in)
196564.8 mm (2.6 in)
196667.3 mm (2.6 in)
196740.6 mm (1.6 in)
196873.7 mm (2.9 in)
1969111.0 mm (4.4 in)
197071.1 mm (2.8 in)
1971127.0 mm (5.0 in)
197265.5 mm (2.6 in)
197354.4 mm (2.1 in)
1974116.6 mm (4.6 in)
197581.5 mm (3.2 in)
197667.3 mm (2.6 in)
197781.8 mm (3.2 in)
197862.5 mm (2.5 in)
197986.4 mm (3.4 in)
198048.8 mm (1.9 in)
198199.8 mm (3.9 in)
198279.2 mm (3.1 in)
1983101.1 mm (4.0 in)
198453.6 mm (2.1 in)
198561.0 mm (2.4 in)
198665.5 mm (2.6 in)
198762.5 mm (2.5 in)
198845.5 mm (1.8 in)
198962.2 mm (2.4 in)
1990111.3 mm (4.4 in)
199163.0 mm (2.5 in)
199257.9 mm (2.3 in)
199355.6 mm (2.2 in)
199474.9 mm (2.9 in)
199572.1 mm (2.8 in)
199648.5 mm (1.9 in)
199748.8 mm (1.9 in)
199850.8 mm (2.0 in)
1999108.7 mm (4.3 in)
200043.9 mm (1.7 in)
200148.8 mm (1.9 in)
200260.2 mm (2.4 in)
200387.6 mm (3.4 in)
200767.3 mm (2.6 in)
2008113.3 mm (4.5 in)
200948.8 mm (1.9 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Monticello (River) by year The wettest five days of the year at Monticello (River), 1964 to 2009. The record is 204.9 mm (8.1 in) in 2003, marked on the chart; the median year is 105.7 mm (4.2 in). 0501001502002501970198019902000Record: 204.9 mm (8.1 in) in 2003
The wettest five days of the year at Monticello (River), 1964 to 2009. The record is 204.9 mm (8.1 in) in 2003, marked on the chart; the median year is 105.7 mm (4.2 in).
Wettest five days (Rx5day) at Monticello (River) by year
YearWettest five days (Rx5day)
196413.8 mm (0.5 in)
1965111.8 mm (4.4 in)
1966112.0 mm (4.4 in)
196767.6 mm (2.7 in)
1968105.7 mm (4.2 in)
1969124.2 mm (4.9 in)
197083.8 mm (3.3 in)
1971133.9 mm (5.3 in)
197294.4 mm (3.7 in)
1973123.9 mm (4.9 in)
1974202.3 mm (8.0 in)
197592.2 mm (3.6 in)
197667.3 mm (2.6 in)
1977151.9 mm (6.0 in)
197862.5 mm (2.5 in)
1979117.7 mm (4.6 in)
1980104.6 mm (4.1 in)
1981103.1 mm (4.1 in)
1982130.2 mm (5.1 in)
1983153.7 mm (6.1 in)
198490.6 mm (3.6 in)
1985103.6 mm (4.1 in)
198684.3 mm (3.3 in)
1987151.0 mm (5.9 in)
198856.4 mm (2.2 in)
1989107.9 mm (4.2 in)
1990159.8 mm (6.3 in)
199178.0 mm (3.1 in)
1992106.0 mm (4.2 in)
199372.6 mm (2.9 in)
1994108.6 mm (4.3 in)
1995107.1 mm (4.2 in)
199687.5 mm (3.4 in)
199767.3 mm (2.6 in)
1998102.0 mm (4.0 in)
1999111.5 mm (4.4 in)
200069.8 mm (2.7 in)
200172.2 mm (2.8 in)
200295.7 mm (3.8 in)
2003204.9 mm (8.1 in)
2007112.0 mm (4.4 in)
2008141.6 mm (5.6 in)
2009113.6 mm (4.5 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Monticello (River) by year The longest dry spell of the year at Monticello (River), 1964 to 2009. The record is 39 days in 1988, marked on the chart; the median year is 20 days. 102030401970198019902000Record: 39 days in 1988
The longest dry spell of the year at Monticello (River), 1964 to 2009. The record is 39 days in 1988, marked on the chart; the median year is 20 days.
Longest dry spell (CDD) at Monticello (River) by year
YearLongest dry spell (CDD)
196411 days
196514 days
196619 days
196720 days
196817 days
196926 days
197021 days
197113 days
197210 days
197314 days
197428 days
197511 days
197627 days
197731 days
197816 days
197936 days
198025 days
198124 days
198218 days
198325 days
198422 days
198524 days
198623 days
198729 days
198839 days
198924 days
199017 days
199116 days
199218 days
199321 days
199417 days
199520 days
199620 days
199715 days
199821 days
199925 days
200016 days
200117 days
200235 days
200327 days
200717 days
200815 days
200914 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

37 years, 1965 to 2007

A day with at least 65.2 mm (2.6 in) of rain is expected about once in 2 years. A day with at least 142.7 mm (5.6 in) of rain is expected about once in 100 years.

Rainfall return levels at Monticello (River): the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years65.2 mm (2.6 in)
5 years83.8 mm (3.3 in)
10 years96.9 mm (3.8 in)
25 years114.5 mm (4.5 in)
50 years128.3 mm (5.1 in)Longer than the 37 years of record
100 years142.7 mm (5.6 in)Longer than the 37 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, 37 years of values from 1965 to 2007.

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: 116.6 mm (4.6 in) in 1974; 111.3 mm (4.4 in) in 1990; 111.0 mm (4.4 in) in 1969.

Download the Data

  • Data for Monticello (River) standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Monticello (River) 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 (2025-12-31).