Chillicothe Weather Records (USC00111627)

Record envelope, standing records and threshold days for Chillicothe (USC00111627), Illinois, United States, with 70 years of record.

Key Facts for Chillicothe

Chillicothe (USC00111627) is a weather station in Illinois, United States at 40.92 latitude and -89.50 longitude, 163 m (535 ft) above sea level.
The station reports from 1941 to 2010, 70 years of record.
820 records set at Chillicothe still stand.
Records are tracked for prcp, snow, snwd: an element needs 30 years of data to be eligible.
Chillicothe set a daily record snowfall of 9.4 cm (3.7 in) on 22 February 2010.

About the Station

Location: Illinois, United States, 40.92 latitude, -89.50 longitude.
Elevation: 163 m (535 ft).
Period of record: 1941 to 2010, 70 years.
Eligible elements: prcp, snow, snwd.

Daily Record Envelope and 2026

0 days at or beyond a record

The band shows the record high and record low for each calendar day at Chillicothe. 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 Chillicothe, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	8.9 C (48.0 F)	-20.6 C (-5.1 F)	n/a	n/a
Feb	14.4 C (57.9 F)	-17.8 C (0.0 F)	n/a	n/a
Mar	22.2 C (72.0 F)	-18.3 C (-0.9 F)	n/a	n/a
Apr	29.4 C (84.9 F)	-1.1 C (30.0 F)	n/a	n/a
May	30.0 C (86.0 F)	5.6 C (42.1 F)	n/a	n/a
Jun	n/a	n/a	n/a	n/a
Jul	n/a	n/a	n/a	n/a
Aug	n/a	n/a	n/a	n/a
Sep	n/a	31.1 C (88.0 F)	n/a	n/a
Oct	-13.3 C (8.1 F)	n/a	n/a	n/a
Nov	15.0 C (59.0 F)	-15.6 C (3.9 F)	n/a	n/a
Dec	13.3 C (55.9 F)	-10.0 C (14.0 F)	n/a	n/a

Which Years Hold Standing Records

820 standing records

820 records at Chillicothe still stand. 1948 holds the most, with 594.

All-Time Record Progression

7 new records

7 all-time records were set at Chillicothe between 13 January 1979 and 17 August 1997. Each dot is a new record.

When Chillicothe set new all-time records
Date	Kind	Detail
1979-01-13	Record snow depth	Record snow depth 40.6 cm (16.0 in)
1979-01-14	Record snow depth	Record snow depth 58.4 cm (23.0 in)
1979-01-28	Record snow depth	Record snow depth 61.0 cm (24.0 in)
1979-01-31	Record snow depth	Record snow depth 63.5 cm (25.0 in)
1996-01-27	Record daily precipitation	Record daily precipitation 114.3 mm (4.5 in)
1997-04-11	Record daily snowfall	Record daily snowfall 29.2 cm (11.5 in)
1997-08-17	Record daily precipitation	Record daily precipitation 121.9 mm (4.8 in)

Wettest Day of Each Month

Aug: 121.9 mm (4.8 in)

The wettest day on record for each calendar month at Chillicothe. The most was 121.9 mm (4.8 in) on 17 August 1997.

Record daily precipitation for each month at Chillicothe
Month	Record daily precipitation (mm)	Date
Jan	114.3 mm (4.5 in)	27 January 1996
Feb	98.0 mm (3.9 in)	21 February 1997
Mar	80.3 mm (3.2 in)	15 March 1944
Apr	65.0 mm (2.6 in)	20 April 1955
May	67.6 mm (2.7 in)	12 May 2002
Jun	103.1 mm (4.1 in)	20 June 1964
Jul	114.0 mm (4.5 in)	9 July 1951
Aug	121.9 mm (4.8 in)	17 August 1997
Sep	79.5 mm (3.1 in)	14 September 1961
Oct	102.1 mm (4.0 in)	3 October 1986
Nov	79.0 mm (3.1 in)	19 November 1985
Dec	70.4 mm (2.8 in)	3 December 1982

Period of Record Coverage

1947 to 1967

3 years of record at Chillicothe, 1947 to 1967. 3 years have data for under 90 percent of days and are left out of rankings: 1947, 1948, 1967.

Latest Records

Latest records at Chillicothe
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
22 February 2010	Chillicothe, US	daily snowfall	9.4 cm (3.7 in)	3.0 cm (1.2 in)	60 years	34 of 100 (Routine)
20 February 2010	Chillicothe, US	daily snowfall	2.5 cm (1.0 in)	2.5 cm (1.0 in)	68 years	20 of 100 (Routine)
9 February 2010	Chillicothe, US	daily snowfall	12.2 cm (4.8 in)	2.0 cm (0.8 in)	68 years	33 of 100 (Routine)
8 January 2010	Chillicothe, US	daily snowfall	6.4 cm (2.5 in)	3.4 cm (1.3 in)	64 years	34 of 100 (Routine)
7 January 2010	Chillicothe, US	daily snowfall (Tie)	10.2 cm (4.0 in)	tie	48 years	5 of 100 (Routine)
31 December 2009	Chillicothe, US	daily snow depth	20.3 cm (8.0 in)	2.5 cm (1.0 in)	26 years	16 of 100 (Routine)
27 December 2009	Chillicothe, US	daily snowfall	11.4 cm (4.5 in)	1.2 cm (0.5 in)	43 years	21 of 100 (Routine)
26 December 2009	Chillicothe, US	daily snowfall	8.9 cm (3.5 in)	6.4 cm (2.5 in)	47 years	36 of 100 (Notable)
24 December 2009	Chillicothe, US	daily rain	31.2 mm (1.2 in)	6.3 mm (0.25 in)	44 years	25 of 100 (Routine)
9 December 2009	Chillicothe, US	daily rain	21.3 mm (0.8 in)	9.6 mm (0.38 in)	15 years	20 of 100 (Routine)
30 October 2009	Chillicothe, US	daily rain	36.3 mm (1.4 in)	16.0 mm (0.6 in)	68 years	39 of 100 (Notable)
2 June 2009	Chillicothe, US	daily rain	35.6 mm (1.4 in)	5.1 mm (0.20 in)	39 years	20 of 100 (Routine)
16 May 2009	Chillicothe, US	daily rain	59.7 mm (2.4 in)	34.3 mm (1.4 in)	66 years	54 of 100 (Notable)
7 May 2009	Chillicothe, US	daily rain	51.1 mm (2.0 in)	0.8 mm (0.03 in)	23 years	12 of 100 (Routine)
29 March 2009	Chillicothe, US	daily rain	46.5 mm (1.8 in)	16.0 mm (0.6 in)	20 years	28 of 100 (Routine)
10 March 2009	Chillicothe, US	daily rain	35.6 mm (1.4 in)	25.9 mm (1.0 in)	56 years	50 of 100 (Notable)
8 March 2009	Chillicothe, US	daily rain	43.4 mm (1.7 in)	18.3 mm (0.7 in)	28 years	33 of 100 (Routine)
17 December 2008	Chillicothe, US	daily snowfall (Tie)	7.6 cm (3.0 in)	tie	27 years	3 of 100 (Routine)
9 September 2008	Chillicothe, US	daily rain	19.6 mm (0.8 in)	1.6 mm (0.06 in)	19 years	12 of 100 (Routine)
5 September 2008	Chillicothe, US	daily rain	54.9 mm (2.2 in)	37.6 mm (1.5 in)	50 years	47 of 100 (Notable)

Extremes by Year

1941 to 2010

Yearly extremes at Chillicothe: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	30.0 C (86.0 F)	1948	15.0 C (59.0 F)	3
Coldest night (TNn)	-20.6 C (-5.1 F)	1948	-15.6 C (3.9 F)	3
Wettest day (Rx1day)	121.9 mm (4.8 in)	1997	64.0 mm (2.5 in)	70
Wettest five days (Rx5day)	162.9 mm (6.4 in)	1968	102.1 mm (4.0 in)	70
Longest dry spell (CDD)	42 days	1969	22 days	70

Hottest day (TXx)

The hottest day of the year at Chillicothe, 1941 to 2010. The record is 30.0 C (86.0 F) in 1948, marked on the chart; the median year is 15.0 C (59.0 F).

Hottest day (TXx) at Chillicothe by year
Year	Hottest day (TXx)
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	15.0 C (59.0 F)
1948	30.0 C (86.0 F)
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	n/a
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	-13.3 C (8.1 F)
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	n/a
1978	n/a
1979	n/a
1980	n/a
1981	n/a
1982	n/a
1983	n/a
1984	n/a
1985	n/a
1986	n/a
1987	n/a
1988	n/a
1989	n/a
1990	n/a
1991	n/a
1992	n/a
1993	n/a
1994	n/a
1995	n/a
1996	n/a
1997	n/a
1998	n/a
1999	n/a
2000	n/a
2001	n/a
2002	n/a
2003	n/a
2004	n/a
2005	n/a
2006	n/a
2007	n/a
2008	n/a
2009	n/a
2010	n/a

Coldest night (TNn)

The coldest night of the year at Chillicothe, 1941 to 2010. The record is -20.6 C (-5.1 F) in 1948, marked on the chart; the median year is -15.6 C (3.9 F).

Coldest night (TNn) at Chillicothe by year
Year	Coldest night (TNn)
1941	n/a
1942	n/a
1943	n/a
1944	n/a
1945	n/a
1946	n/a
1947	-15.6 C (3.9 F)
1948	-20.6 C (-5.1 F)
1949	n/a
1950	n/a
1951	n/a
1952	n/a
1953	n/a
1954	n/a
1955	31.1 C (88.0 F)
1956	n/a
1957	n/a
1958	n/a
1959	n/a
1960	n/a
1961	n/a
1962	n/a
1963	n/a
1964	n/a
1965	n/a
1966	n/a
1967	n/a
1968	n/a
1969	n/a
1970	n/a
1971	n/a
1972	n/a
1973	n/a
1974	n/a
1975	n/a
1976	n/a
1977	n/a
1978	n/a
1979	n/a
1980	n/a
1981	n/a
1982	n/a
1983	n/a
1984	n/a
1985	n/a
1986	n/a
1987	n/a
1988	n/a
1989	n/a
1990	n/a
1991	n/a
1992	n/a
1993	n/a
1994	n/a
1995	n/a
1996	n/a
1997	n/a
1998	n/a
1999	n/a
2000	n/a
2001	n/a
2002	n/a
2003	n/a
2004	n/a
2005	n/a
2006	n/a
2007	n/a
2008	n/a
2009	n/a
2010	n/a

Wettest day (Rx1day)

The wettest day of the year at Chillicothe, 1941 to 2010. The record is 121.9 mm (4.8 in) in 1997, marked on the chart; the median year is 64.0 mm (2.5 in).

Wettest day (Rx1day) at Chillicothe by year
Year	Wettest day (Rx1day)
1941	57.2 mm (2.3 in)
1942	79.0 mm (3.1 in)
1943	55.9 mm (2.2 in)
1944	80.3 mm (3.2 in)
1945	65.3 mm (2.6 in)
1946	60.5 mm (2.4 in)
1947	48.5 mm (1.9 in)
1948	55.4 mm (2.2 in)
1949	64.8 mm (2.6 in)
1950	92.5 mm (3.6 in)
1951	114.0 mm (4.5 in)
1952	81.5 mm (3.2 in)
1953	59.2 mm (2.3 in)
1954	68.6 mm (2.7 in)
1955	83.8 mm (3.3 in)
1956	100.6 mm (4.0 in)
1957	69.9 mm (2.8 in)
1958	78.7 mm (3.1 in)
1959	52.6 mm (2.1 in)
1960	51.6 mm (2.0 in)
1961	79.5 mm (3.1 in)
1962	66.8 mm (2.6 in)
1963	30.5 mm (1.2 in)
1964	103.1 mm (4.1 in)
1965	61.0 mm (2.4 in)
1966	56.6 mm (2.2 in)
1967	63.2 mm (2.5 in)
1968	85.9 mm (3.4 in)
1969	87.9 mm (3.5 in)
1970	68.8 mm (2.7 in)
1971	55.6 mm (2.2 in)
1972	57.9 mm (2.3 in)
1973	43.2 mm (1.7 in)
1974	50.8 mm (2.0 in)
1975	34.8 mm (1.4 in)
1976	53.3 mm (2.1 in)
1977	58.4 mm (2.3 in)
1978	42.4 mm (1.7 in)
1979	38.6 mm (1.5 in)
1980	81.3 mm (3.2 in)
1981	106.2 mm (4.2 in)
1982	70.4 mm (2.8 in)
1983	67.3 mm (2.6 in)
1984	68.6 mm (2.7 in)
1985	79.0 mm (3.1 in)
1986	102.1 mm (4.0 in)
1987	38.1 mm (1.5 in)
1988	38.9 mm (1.5 in)
1989	66.8 mm (2.6 in)
1990	96.5 mm (3.8 in)
1991	72.9 mm (2.9 in)
1992	88.9 mm (3.5 in)
1993	91.7 mm (3.6 in)
1994	51.6 mm (2.0 in)
1995	50.8 mm (2.0 in)
1996	114.3 mm (4.5 in)
1997	121.9 mm (4.8 in)
1998	40.9 mm (1.6 in)
1999	53.8 mm (2.1 in)
2000	43.2 mm (1.7 in)
2001	83.1 mm (3.3 in)
2002	67.6 mm (2.7 in)
2003	77.5 mm (3.1 in)
2004	52.3 mm (2.1 in)
2005	35.8 mm (1.4 in)
2006	58.4 mm (2.3 in)
2007	42.7 mm (1.7 in)
2008	54.9 mm (2.2 in)
2009	59.7 mm (2.4 in)
2010	19.1 mm (0.8 in)

Wettest five days (Rx5day)

The wettest five days of the year at Chillicothe, 1941 to 2010. The record is 162.9 mm (6.4 in) in 1968, marked on the chart; the median year is 102.1 mm (4.0 in).

Wettest five days (Rx5day) at Chillicothe by year
Year	Wettest five days (Rx5day)
1941	112.5 mm (4.4 in)
1942	95.7 mm (3.8 in)
1943	102.9 mm (4.1 in)
1944	130.2 mm (5.1 in)
1945	98.3 mm (3.9 in)
1946	82.5 mm (3.2 in)
1947	67.3 mm (2.6 in)
1948	94.5 mm (3.7 in)
1949	102.0 mm (4.0 in)
1950	113.2 mm (4.5 in)
1951	124.6 mm (4.9 in)
1952	95.0 mm (3.7 in)
1953	96.7 mm (3.8 in)
1954	136.7 mm (5.4 in)
1955	91.2 mm (3.6 in)
1956	134.6 mm (5.3 in)
1957	96.6 mm (3.8 in)
1958	105.7 mm (4.2 in)
1959	105.0 mm (4.1 in)
1960	69.2 mm (2.7 in)
1961	134.6 mm (5.3 in)
1962	73.7 mm (2.9 in)
1963	49.8 mm (2.0 in)
1964	107.9 mm (4.2 in)
1965	125.9 mm (5.0 in)
1966	66.3 mm (2.6 in)
1967	75.2 mm (3.0 in)
1968	162.9 mm (6.4 in)
1969	130.0 mm (5.1 in)
1970	122.0 mm (4.8 in)
1971	102.1 mm (4.0 in)
1972	96.5 mm (3.8 in)
1973	84.9 mm (3.3 in)
1974	128.5 mm (5.1 in)
1975	62.2 mm (2.4 in)
1976	104.8 mm (4.1 in)
1977	98.3 mm (3.9 in)
1978	72.6 mm (2.9 in)
1979	69.9 mm (2.8 in)
1980	124.0 mm (4.9 in)
1981	122.0 mm (4.8 in)
1982	91.8 mm (3.6 in)
1983	107.5 mm (4.2 in)
1984	78.4 mm (3.1 in)
1985	133.3 mm (5.2 in)
1986	147.5 mm (5.8 in)
1987	74.0 mm (2.9 in)
1988	60.7 mm (2.4 in)
1989	122.6 mm (4.8 in)
1990	145.5 mm (5.7 in)
1991	147.8 mm (5.8 in)
1992	98.8 mm (3.9 in)
1993	99.6 mm (3.9 in)
1994	79.0 mm (3.1 in)
1995	114.9 mm (4.5 in)
1996	114.3 mm (4.5 in)
1997	125.0 mm (4.9 in)
1998	52.8 mm (2.1 in)
1999	78.2 mm (3.1 in)
2000	90.4 mm (3.6 in)
2001	103.4 mm (4.1 in)
2002	93.5 mm (3.7 in)
2003	110.2 mm (4.3 in)
2004	72.6 mm (2.9 in)
2005	79.1 mm (3.1 in)
2006	107.4 mm (4.2 in)
2007	111.2 mm (4.4 in)
2008	133.4 mm (5.3 in)
2009	105.6 mm (4.2 in)
2010	23.5 mm (0.9 in)

Longest dry spell (CDD)

The longest dry spell of the year at Chillicothe, 1941 to 2010. The record is 42 days in 1969, marked on the chart; the median year is 22 days.

Longest dry spell (CDD) at Chillicothe by year
Year	Longest dry spell (CDD)
1941	21 days
1942	27 days
1943	27 days
1944	28 days
1945	21 days
1946	25 days
1947	27 days
1948	27 days
1949	21 days
1950	18 days
1951	11 days
1952	33 days
1953	22 days
1954	23 days
1955	27 days
1956	40 days
1957	28 days
1958	22 days
1959	14 days
1960	24 days
1961	19 days
1962	19 days
1963	16 days
1964	36 days
1965	27 days
1966	24 days
1967	23 days
1968	19 days
1969	42 days
1970	24 days
1971	24 days
1972	13 days
1973	18 days
1974	22 days
1975	14 days
1976	26 days
1977	20 days
1978	17 days
1979	39 days
1980	28 days
1981	24 days
1982	20 days
1983	25 days
1984	15 days
1985	13 days
1986	23 days
1987	30 days
1988	25 days
1989	24 days
1990	16 days
1991	22 days
1992	20 days
1993	23 days
1994	19 days
1995	27 days
1996	20 days
1997	18 days
1998	23 days
1999	42 days
2000	18 days
2001	19 days
2002	22 days
2003	20 days
2004	23 days
2005	22 days
2006	15 days
2007	21 days
2008	13 days
2009	14 days
2010	12 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

66 years, 1941 to 2009

A day with at least 64.8 mm (2.6 in) of rain is expected about once in 2 years. A day with at least 130.3 mm (5.1 in) of rain is expected about once in 100 years.

Rainfall return levels at Chillicothe: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	64.8 mm (2.6 in)
5 years	84.6 mm (3.3 in)
10 years	96.7 mm (3.8 in)
25 years	111.0 mm (4.4 in)
50 years	121.0 mm (4.8 in)
100 years	130.3 mm (5.1 in)	Longer than the 66 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, 66 years of values from 1941 to 2009.

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: 121.9 mm (4.8 in) in 1997; 114.3 mm (4.5 in) in 1996; 114.0 mm (4.5 in) in 1951.

Download the Data

Data for Chillicothe standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Chillicothe 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 2025-12-31. Last revised 31 December 2025 (2025-12-31).