Chillicothe Mound City Weather Records (USC00331528)

Record envelope, standing records and threshold days for Chillicothe Mound City (USC00331528), Ohio, United States, with 39 years of record.

Key Facts for Chillicothe Mound City

Chillicothe Mound City (USC00331528) is a weather station in Ohio, United States at 39.37 latitude and -83.00 longitude, 198 m (650 ft) above sea level.
The station reports from 1972 to 2010, 39 years of record.
1,464 records set at Chillicothe Mound City still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Chillicothe Mound City set a monthly record daily precipitation of 63.5 mm (2.5 in) on 16 December 2008.

About the Station

Location: Ohio, United States, 39.37 latitude, -83.00 longitude.
Elevation: 198 m (650 ft).
Period of record: 1972 to 2010, 39 years.
Eligible elements: tmax, tmin, 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 Mound City. 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 Mound City, with 2026 drawn through them
Month	Highest record high	Lowest record low	2026 highest maximum	2026 lowest minimum
Jan	28.3 C (82.9 F)	-33.9 C (-29.0 F)	n/a	n/a
Feb	25.0 C (77.0 F)	-25.6 C (-14.1 F)	n/a	n/a
Mar	31.1 C (88.0 F)	-23.3 C (-9.9 F)	n/a	n/a
Apr	32.2 C (90.0 F)	-10.6 C (12.9 F)	n/a	n/a
May	33.9 C (93.0 F)	-1.7 C (28.9 F)	n/a	n/a
Jun	39.4 C (102.9 F)	1.7 C (35.1 F)	n/a	n/a
Jul	39.4 C (102.9 F)	5.0 C (41.0 F)	n/a	n/a
Aug	40.6 C (105.1 F)	2.2 C (36.0 F)	n/a	n/a
Sep	37.8 C (100.0 F)	-0.6 C (30.9 F)	n/a	n/a
Oct	33.3 C (91.9 F)	-8.3 C (17.1 F)	n/a	n/a
Nov	28.9 C (84.0 F)	-18.9 C (-2.0 F)	n/a	n/a
Dec	26.7 C (80.1 F)	-29.4 C (-20.9 F)	n/a	n/a

Which Years Hold Standing Records

1,464 standing records

1,464 records at Chillicothe Mound City still stand. 1977 holds the most, with 73.

Standing records at Chillicothe Mound City by the year they were set
Year set	Standing records
1972	26
1973	33
1974	40
1975	39
1976	65
1977	73
1978	48
1979	54
1980	38
1981	34
1982	52
1983	51
1984	55
1985	38
1986	45
1987	27
1988	70
1989	50
1990	34
1991	63
1992	27
1993	36
1994	32
1995	25
1996	47
1997	32
1998	37
1999	39
2000	35
2001	28
2002	37
2003	19
2004	20
2005	19
2006	26
2007	42
2008	28

All-Time Record Progression

1 new records

1 all-time records were set at Chillicothe Mound City between 4 June 2008 and 4 June 2008. Each dot is a new record.

Wettest Day of Each Month

Jun: 104.1 mm (4.1 in)

The wettest day on record for each calendar month at Chillicothe Mound City. The most was 104.1 mm (4.1 in) on 4 June 2008.

Record daily precipitation for each month at Chillicothe Mound City
Month	Record daily precipitation (mm)	Date
Jan	49.5 mm (1.9 in)	23 January 1982
Feb	56.1 mm (2.2 in)	19 February 2000
Mar	50.8 mm (2.0 in)	4 March 2008
Apr	77.5 mm (3.1 in)	22 April 2002
May	76.5 mm (3.0 in)	29 May 1990
Jun	104.1 mm (4.1 in)	4 June 2008
Jul	62.2 mm (2.4 in)	28 July 2002
Aug	101.1 mm (4.0 in)	22 August 1990
Sep	79.2 mm (3.1 in)	14 September 1979
Oct	73.2 mm (2.9 in)	8 October 1998
Nov	51.8 mm (2.0 in)	16 November 1985
Dec	63.5 mm (2.5 in)	16 December 2008

Period of Record Coverage

1972 to 2008

37 years of record at Chillicothe Mound City, 1972 to 2008. 8 years have data for under 90 percent of days and are left out of rankings: 1972, 1987, 2003, 2004, 2005, 2006, 2007, 2008.

Days with data per year at Chillicothe Mound City
Year	Days with data	Share of year	Complete
1972	274	75%	No
1973	334	92%	Yes
1974	364	100%	Yes
1975	365	100%	Yes
1976	366	100%	Yes
1977	359	98%	Yes
1978	356	98%	Yes
1979	362	99%	Yes
1980	362	99%	Yes
1981	363	99%	Yes
1982	362	99%	Yes
1983	362	99%	Yes
1984	362	99%	Yes
1985	356	98%	Yes
1986	351	96%	Yes
1987	324	89%	No
1988	361	99%	Yes
1989	352	96%	Yes
1990	359	98%	Yes
1991	359	98%	Yes
1992	360	98%	Yes
1993	361	99%	Yes
1994	334	92%	Yes
1995	356	98%	Yes
1996	355	97%	Yes
1997	356	98%	Yes
1998	356	98%	Yes
1999	357	98%	Yes
2000	354	97%	Yes
2001	332	91%	Yes
2002	349	96%	Yes
2003	313	86%	No
2004	268	73%	No
2005	196	54%	No
2006	234	64%	No
2007	191	52%	No
2008	175	48%	No

Latest Records

Latest records at Chillicothe Mound City
Date	Station	Record	Value	Beat old record by	Old record stood	Significance
16 December 2008	Chillicothe Mound City, US	monthly rain	63.5 mm (2.5 in)	19.8 mm (0.8 in)	22 years	43 of 100 (Notable)
15 December 2008	Chillicothe Mound City, US	daily low min	-17.8 C (0.0 F)	4.5 C (8.1 F)	23 years	16 of 100 (Routine)
9 December 2008	Chillicothe Mound City, US	daily low min	-17.8 C (0.0 F)	3.4 C (6.1 F)	19 years	13 of 100 (Routine)
5 December 2008	Chillicothe Mound City, US	daily low min	-17.8 C (0.0 F)	5.6 C (10.1 F)	34 years	21 of 100 (Routine)
2 December 2008	Chillicothe Mound City, US	daily low max	0.0 C (32.0 F)	0.6 C (1.1 F)	6 years	4 of 100 (Routine)
19 November 2008	Chillicothe Mound City, US	daily low min	-14.4 C (6.1 F)	6.6 C (11.9 F)	11 years	17 of 100 (Routine)
19 November 2008	Chillicothe Mound City, US	daily low max	-1.7 C (28.9 F)	2.3 C (4.1 F)	19 years	11 of 100 (Routine)
17 November 2008	Chillicothe Mound City, US	daily high min	9.4 C (48.9 F)	0.5 C (0.9 F)	21 years	9 of 100 (Routine)
16 October 2008	Chillicothe Mound City, US	daily high min	12.8 C (55.0 F)	1.1 C (2.0 F)	1 year	5 of 100 (Routine)
12 September 2008	Chillicothe Mound City, US	daily high min	20.6 C (69.1 F)	0.6 C (1.1 F)	25 years	11 of 100 (Routine)
9 September 2008	Chillicothe Mound City, US	daily rain	11.7 mm (0.5 in)	0.3 mm (0.01 in)	35 years	13 of 100 (Routine)
5 September 2008	Chillicothe Mound City, US	daily high min	20.6 C (69.1 F)	1.2 C (2.2 F)	23 years	11 of 100 (Routine)
4 September 2008	Chillicothe Mound City, US	daily high min (Tie)	20.0 C (68.0 F)	tie	17 years	2 of 100 (Routine)
5 August 2008	Chillicothe Mound City, US	daily rain	57.7 mm (2.3 in)	29.3 mm (1.2 in)	26 years	35 of 100 (Notable)
10 July 2008	Chillicothe Mound City, US	daily low min	7.2 C (45.0 F)	5.0 C (9.0 F)	11 years	20 of 100 (Routine)
9 July 2008	Chillicothe Mound City, US	daily rain	47.2 mm (1.9 in)	20.0 mm (0.8 in)	28 years	28 of 100 (Routine)
26 June 2008	Chillicothe Mound City, US	daily rain	19.1 mm (0.8 in)	2.1 mm (0.08 in)	30 years	14 of 100 (Routine)
10 June 2008	Chillicothe Mound City, US	daily high min (Tie)	21.1 C (70.0 F)	tie	34 years	3 of 100 (Routine)
6 June 2008	Chillicothe Mound City, US	daily high max	32.8 C (91.0 F)	0.6 C (1.1 F)	3 years	4 of 100 (Routine)
6 June 2008	Chillicothe Mound City, US	daily high min (Tie)	20.0 C (68.0 F)	tie	22 years	2 of 100 (Routine)

Climate Trend

24 complete years, 1974 to 2002

One stripe for each of 24 complete years at Chillicothe Mound City, 1974 to 2002. Blue stripes are years cooler than the station's own mean of 11.4 C (52.5 F); red stripes are warmer. The coolest year was 1978, at 10.3 C (50.5 F), and the warmest was 1998, at 12.9 C (55.3 F). The strongest colour marks a difference of 1.6 C (2.9 F).

Annual mean temperature at Chillicothe Mound City as warming stripes, 1974 to 2002
Year	Annual mean temperature	Difference from the station mean
1974	11.3 C	-0.13 C
1975	11.3 C	-0.05 C
1977	11.1 C	-0.31 C
1978	10.3 C	-1.09 C
1979	10.6 C	-0.79 C
1980	11.0 C	-0.35 C
1981	10.9 C	-0.46 C
1982	11.3 C	-0.05 C
1983	11.6 C	+0.21 C
1984	11.3 C	-0.10 C
1985	11.3 C	-0.05 C
1986	12.3 C	+0.90 C
1988	11.1 C	-0.30 C
1989	10.4 C	-0.95 C
1990	12.5 C	+1.12 C
1991	12.7 C	+1.35 C
1992	11.1 C	-0.29 C
1993	11.2 C	-0.14 C
1996	10.6 C	-0.79 C
1997	10.8 C	-0.62 C
1998	12.9 C	+1.55 C
1999	12.2 C	+0.82 C
2000	11.4 C	+0.02 C
2002	11.9 C	+0.53 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

1972 to 2010

Yearly extremes at Chillicothe Mound City: the record and the median year
Measure	Record	Year of the record	Median year	Years with a value
Hottest day (TXx)	40.6 C (105.1 F)	1983	35.6 C (96.1 F)	37
Coldest night (TNn)	-33.9 C (-29.0 F)	1994	-19.4 C (-2.9 F)	37
Wettest day (Rx1day)	104.1 mm (4.1 in)	2008	52.0 mm (2.0 in)	38
Wettest five days (Rx5day)	136.0 mm (5.4 in)	1990	79.4 mm (3.1 in)	38
Longest dry spell (CDD)	30 days	2008	17 days	38

Hottest day (TXx)

The hottest day of the year at Chillicothe Mound City, 1972 to 2010. The record is 40.6 C (105.1 F) in 1983, marked on the chart; the median year is 35.6 C (96.1 F).

Hottest day (TXx) at Chillicothe Mound City by year
Year	Hottest day (TXx)
1972	35.6 C (96.1 F)
1973	36.1 C (97.0 F)
1974	32.8 C (91.0 F)
1975	35.0 C (95.0 F)
1976	34.4 C (93.9 F)
1977	36.7 C (98.1 F)
1978	36.7 C (98.1 F)
1979	36.1 C (97.0 F)
1980	37.2 C (99.0 F)
1981	34.4 C (93.9 F)
1982	34.4 C (93.9 F)
1983	40.6 C (105.1 F)
1984	36.1 C (97.0 F)
1985	34.4 C (93.9 F)
1986	35.0 C (95.0 F)
1987	35.0 C (95.0 F)
1988	39.4 C (102.9 F)
1989	33.9 C (93.0 F)
1990	35.6 C (96.1 F)
1991	36.7 C (98.1 F)
1992	32.2 C (90.0 F)
1993	36.1 C (97.0 F)
1994	35.0 C (95.0 F)
1995	36.1 C (97.0 F)
1996	33.3 C (91.9 F)
1997	32.8 C (91.0 F)
1998	37.2 C (99.0 F)
1999	38.3 C (100.9 F)
2000	32.8 C (91.0 F)
2001	34.4 C (93.9 F)
2002	35.6 C (96.1 F)
2003	32.8 C (91.0 F)
2004	32.8 C (91.0 F)
2005	36.7 C (98.1 F)
2006	35.6 C (96.1 F)
2007	37.8 C (100.0 F)
2008	33.9 C (93.0 F)
2010	n/a

Coldest night (TNn)

The coldest night of the year at Chillicothe Mound City, 1972 to 2010. The record is -33.9 C (-29.0 F) in 1994, marked on the chart; the median year is -19.4 C (-2.9 F).

Coldest night (TNn) at Chillicothe Mound City by year
Year	Coldest night (TNn)
1972	-15.0 C (5.0 F)
1973	-18.3 C (-0.9 F)
1974	-15.6 C (3.9 F)
1975	-19.4 C (-2.9 F)
1976	-20.6 C (-5.1 F)
1977	-28.3 C (-18.9 F)
1978	-22.8 C (-9.0 F)
1979	-22.2 C (-8.0 F)
1980	-23.3 C (-9.9 F)
1981	-21.1 C (-6.0 F)
1982	-28.9 C (-20.0 F)
1983	-25.0 C (-13.0 F)
1984	-29.4 C (-20.9 F)
1985	-28.3 C (-18.9 F)
1986	-18.9 C (-2.0 F)
1987	-16.1 C (3.0 F)
1988	-18.3 C (-0.9 F)
1989	-29.4 C (-20.9 F)
1990	-12.8 C (9.0 F)
1991	-15.6 C (3.9 F)
1992	-18.3 C (-0.9 F)
1993	-18.3 C (-0.9 F)
1994	-33.9 C (-29.0 F)
1995	-18.9 C (-2.0 F)
1996	-20.6 C (-5.1 F)
1997	-17.8 C (0.0 F)
1998	-12.8 C (9.0 F)
1999	-21.1 C (-6.0 F)
2000	-22.8 C (-9.0 F)
2001	-17.2 C (1.0 F)
2002	-13.3 C (8.1 F)
2003	-20.0 C (-4.0 F)
2004	-21.1 C (-6.0 F)
2005	-19.4 C (-2.9 F)
2006	-14.4 C (6.1 F)
2007	-21.1 C (-6.0 F)
2008	-19.4 C (-2.9 F)
2010	n/a

Wettest day (Rx1day)

The wettest day of the year at Chillicothe Mound City, 1972 to 2010. The record is 104.1 mm (4.1 in) in 2008, marked on the chart; the median year is 52.0 mm (2.0 in).

Wettest day (Rx1day) at Chillicothe Mound City by year
Year	Wettest day (Rx1day)
1972	44.5 mm (1.8 in)
1973	36.6 mm (1.4 in)
1974	103.1 mm (4.1 in)
1975	59.7 mm (2.4 in)
1976	40.1 mm (1.6 in)
1977	50.8 mm (2.0 in)
1978	56.9 mm (2.2 in)
1979	79.2 mm (3.1 in)
1980	44.5 mm (1.8 in)
1981	44.5 mm (1.8 in)
1982	49.5 mm (1.9 in)
1983	48.8 mm (1.9 in)
1984	49.8 mm (2.0 in)
1985	51.8 mm (2.0 in)
1986	43.7 mm (1.7 in)
1987	40.4 mm (1.6 in)
1988	77.7 mm (3.1 in)
1989	53.3 mm (2.1 in)
1990	101.1 mm (4.0 in)
1991	40.1 mm (1.6 in)
1992	52.1 mm (2.1 in)
1993	32.8 mm (1.3 in)
1994	64.5 mm (2.5 in)
1995	60.2 mm (2.4 in)
1996	43.9 mm (1.7 in)
1997	50.5 mm (2.0 in)
1998	73.2 mm (2.9 in)
1999	59.9 mm (2.4 in)
2000	56.1 mm (2.2 in)
2001	50.8 mm (2.0 in)
2002	77.5 mm (3.1 in)
2003	57.9 mm (2.3 in)
2004	55.1 mm (2.2 in)
2005	37.6 mm (1.5 in)
2006	58.9 mm (2.3 in)
2007	57.7 mm (2.3 in)
2008	104.1 mm (4.1 in)
2010	0.0 mm (0.00 in)

Wettest five days (Rx5day)

The wettest five days of the year at Chillicothe Mound City, 1972 to 2010. The record is 136.0 mm (5.4 in) in 1990, marked on the chart; the median year is 79.4 mm (3.1 in).

Wettest five days (Rx5day) at Chillicothe Mound City by year
Year	Wettest five days (Rx5day)
1972	66.8 mm (2.6 in)
1973	62.3 mm (2.5 in)
1974	122.9 mm (4.8 in)
1975	71.7 mm (2.8 in)
1976	52.8 mm (2.1 in)
1977	96.1 mm (3.8 in)
1978	88.9 mm (3.5 in)
1979	97.8 mm (3.9 in)
1980	83.8 mm (3.3 in)
1981	62.2 mm (2.4 in)
1982	77.5 mm (3.1 in)
1983	103.9 mm (4.1 in)
1984	54.3 mm (2.1 in)
1985	85.8 mm (3.4 in)
1986	59.7 mm (2.4 in)
1987	67.1 mm (2.6 in)
1988	98.5 mm (3.9 in)
1989	89.7 mm (3.5 in)
1990	136.0 mm (5.4 in)
1991	63.6 mm (2.5 in)
1992	60.2 mm (2.4 in)
1993	75.0 mm (3.0 in)
1994	107.9 mm (4.2 in)
1995	81.3 mm (3.2 in)
1996	69.7 mm (2.7 in)
1997	95.5 mm (3.8 in)
1998	120.7 mm (4.8 in)
1999	71.3 mm (2.8 in)
2000	98.7 mm (3.9 in)
2001	120.1 mm (4.7 in)
2002	84.8 mm (3.3 in)
2003	119.9 mm (4.7 in)
2004	73.4 mm (2.9 in)
2005	47.3 mm (1.9 in)
2006	42.2 mm (1.7 in)
2007	30.5 mm (1.2 in)
2008	119.3 mm (4.7 in)
2010	0.0 mm (0.00 in)

Longest dry spell (CDD)

The longest dry spell of the year at Chillicothe Mound City, 1972 to 2010. The record is 30 days in 2008, marked on the chart; the median year is 17 days.

Longest dry spell (CDD) at Chillicothe Mound City by year
Year	Longest dry spell (CDD)
1972	20 days
1973	14 days
1974	18 days
1975	15 days
1976	27 days
1977	21 days
1978	18 days
1979	19 days
1980	27 days
1981	18 days
1982	17 days
1983	18 days
1984	20 days
1985	24 days
1986	18 days
1987	14 days
1988	15 days
1989	12 days
1990	13 days
1991	13 days
1992	17 days
1993	17 days
1994	15 days
1995	27 days
1996	13 days
1997	15 days
1998	13 days
1999	16 days
2000	19 days
2001	16 days
2002	18 days
2003	16 days
2004	17 days
2005	14 days
2006	11 days
2007	15 days
2008	30 days
2010	30 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

24 years with a frost

Across 24 years with a frost, the median last spring frost at Chillicothe Mound City falls on 25 April and the median first autumn frost on 17 October, which leaves a median of 173 days between them.

Frost dates and growing season at Chillicothe Mound City
Measure	Median, all years	Earliest period	Recent period (1974 to 2002)	Recent against earliest	Fitted trend
Last spring frost	25 April	n/a	25 April	n/a	n/a
First autumn frost	17 October	n/a	17 October	n/a	n/a
Growing days	173 days	n/a	173 days	n/a	n/a

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

30 years, 1973 to 2002

A day with at least 52.1 mm (2.1 in) of rain is expected about once in 2 years. A day with at least 124.1 mm (4.9 in) of rain is expected about once in 100 years.

Rainfall return levels at Chillicothe Mound City: the daily rain expected about once in a given number of years
Expected about once in	A day with at least	Note
2 years	52.1 mm (2.1 in)
5 years	66.8 mm (2.6 in)
10 years	78.2 mm (3.1 in)
25 years	94.6 mm (3.7 in)
50 years	108.6 mm (4.3 in)	Longer than the 30 years of record
100 years	124.1 mm (4.9 in)	Longer than the 30 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, 30 years of values from 1973 to 2002.

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: 103.1 mm (4.1 in) in 1974; 101.1 mm (4.0 in) in 1990; 79.2 mm (3.1 in) in 1979.

Download the Data

Data for Chillicothe Mound City standing records by year: CSV or JSON. Field meanings are on the data page.
Data for Chillicothe Mound City 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 2026-10-15 (15 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).