Record envelope, standing records and threshold days for Chillicothe (USC00331523), Ohio, United States, with 76 years of record.
Key Facts for Chillicothe
Chillicothe (USC00331523) is a weather station in Ohio, United States at 39.33 latitude and -82.97 longitude, 189 m (620 ft) above sea level.
The station reports from 1897 to 1972, 76 years of record.
1,464 records set at Chillicothe still stand.
Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
Chillicothe set a daily record high maximum temperature of 20.6 C (69.1 F) on 29 February 1972.
About the Station
Location: Ohio, United States, 39.33 latitude, -82.97 longitude.
Elevation: 189 m (620 ft).
Period of record: 1897 to 1972, 76 years.
Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
0 days at or beyond a record
Record highRecord low2026 daily maximum2026 daily minimum
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
26.1 C (79.0 F)
-26.7 C (-16.1 F)
n/a
n/a
Feb
26.1 C (79.0 F)
-27.8 C (-18.0 F)
n/a
n/a
Mar
31.7 C (89.1 F)
-24.4 C (-11.9 F)
n/a
n/a
Apr
34.4 C (93.9 F)
-10.6 C (12.9 F)
n/a
n/a
May
35.6 C (96.1 F)
-2.2 C (28.0 F)
n/a
n/a
Jun
38.9 C (102.0 F)
3.3 C (37.9 F)
n/a
n/a
Jul
42.8 C (109.0 F)
7.8 C (46.0 F)
n/a
n/a
Aug
40.6 C (105.1 F)
3.9 C (39.0 F)
n/a
n/a
Sep
38.9 C (102.0 F)
-1.7 C (28.9 F)
n/a
n/a
Oct
34.4 C (93.9 F)
-7.8 C (18.0 F)
n/a
n/a
Nov
28.3 C (82.9 F)
-20.0 C (-4.0 F)
n/a
n/a
Dec
23.9 C (75.0 F)
-21.7 C (-7.1 F)
n/a
n/a
Which Years Hold Standing Records
1,464 standing records
Year with most
1,464 records at Chillicothe still stand. 1930 holds the most, with 57.
Standing records at Chillicothe by the year they were set
Year set
Standing records
1897
2
1898
5
1899
13
1901
4
1903
19
1904
11
1905
15
1906
13
1923
35
1924
29
1925
51
1926
17
1927
54
1928
28
1929
43
1930
57
1931
35
1932
26
1933
32
1934
35
1935
25
1936
56
1937
27
1938
18
1939
28
1940
34
1941
28
1942
25
1943
29
1944
24
1945
23
1946
21
1947
30
1948
27
1949
22
1950
32
1951
32
1952
18
1953
23
1954
22
1955
18
1956
23
1957
16
1958
26
1959
20
1960
28
1961
23
1962
34
1963
36
1964
28
1965
23
1966
20
1967
32
1968
14
1969
15
1970
17
1971
19
1972
4
All-Time Record Progression
3 new records
3 all-time records were set at Chillicothe between 3 February 1951 and 23 June 1968. Each dot is a new record.
When Chillicothe set new all-time records
Date
Kind
Detail
1951-02-03
Record low minimum temperature
Record low minimum temperature -27.8 C (-18.0 F)
1962-01-11
Record low maximum temperature
Record low maximum temperature -16.1 C (3.0 F)
1968-06-23
Record daily precipitation
Record daily precipitation 121.9 mm (4.8 in)
Wettest Day of Each Month
Jun: 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 23 June 1968.
Record daily precipitation for each month at Chillicothe
Month
Record daily precipitation (mm)
Date
Jan
57.4 mm (2.3 in)
21 January 1937
Feb
50.3 mm (2.0 in)
22 February 1971
Mar
105.4 mm (4.1 in)
10 March 1964
Apr
75.7 mm (3.0 in)
11 April 1948
May
96.5 mm (3.8 in)
24 May 1968
Jun
121.9 mm (4.8 in)
23 June 1968
Jul
73.7 mm (2.9 in)
4 July 1962
Aug
109.2 mm (4.3 in)
21 August 1947
Sep
99.6 mm (3.9 in)
4 September 1937
Oct
55.1 mm (2.2 in)
1 October 1945
Nov
52.8 mm (2.1 in)
8 November 1925
Dec
59.2 mm (2.3 in)
15 December 1948
Period of Record Coverage
1897 to 1972
Complete yearUnder 90 percent of days
58 years of record at Chillicothe, 1897 to 1972. 12 years have data for under 90 percent of days and are left out of rankings: 1897, 1898, 1899, 1901, 1903, 1904, 1905, 1906 and others.
Cooler than the station meanWarmer than the station mean
One stripe for each of 42 complete years at Chillicothe, 1925 to 1971. Blue stripes are years cooler than the station's own mean of 12.1 C (53.8 F); red stripes are warmer. The coolest year was 1963, at 10.6 C (51.1 F), and the warmest was 1946, at 13.4 C (56.0 F). The strongest colour marks a difference of 1.5 C (2.7 F).
Annual mean temperature at Chillicothe as warming stripes, 1925 to 1971
Year
Annual mean temperature
Difference from the station mean
1925
12.4 C
+0.26 C
1926
11.5 C
-0.57 C
1927
12.6 C
+0.53 C
1928
11.9 C
-0.23 C
1929
11.3 C
-0.78 C
1934
12.6 C
+0.50 C
1935
11.9 C
-0.23 C
1936
12.2 C
+0.08 C
1937
12.0 C
-0.15 C
1938
13.2 C
+1.06 C
1939
12.9 C
+0.76 C
1940
11.1 C
-1.04 C
1941
12.4 C
+0.33 C
1942
11.8 C
-0.27 C
1943
12.3 C
+0.17 C
1944
12.8 C
+0.67 C
1945
12.4 C
+0.29 C
1946
13.4 C
+1.26 C
1947
12.0 C
-0.12 C
1948
12.2 C
+0.07 C
1949
13.2 C
+1.09 C
1950
12.1 C
-0.01 C
1951
12.3 C
+0.20 C
1952
13.0 C
+0.87 C
1953
13.3 C
+1.16 C
1954
12.9 C
+0.83 C
1955
12.6 C
+0.47 C
1956
12.3 C
+0.24 C
1957
12.5 C
+0.41 C
1958
11.0 C
-1.14 C
1959
13.1 C
+1.02 C
1960
11.4 C
-0.67 C
1961
12.3 C
+0.18 C
1962
11.2 C
-0.89 C
1963
10.6 C
-1.50 C
1964
12.1 C
+0.00 C
1965
11.7 C
-0.36 C
1966
11.2 C
-0.94 C
1967
10.9 C
-1.20 C
1969
10.6 C
-1.47 C
1970
11.7 C
-0.38 C
1971
11.4 C
-0.69 C
The annual mean temperature here has fallen by 0.17 C (0.00 to 0.34) per decade over 1925 to 1971. In Fahrenheit: 0.31 F (0.00 to 0.62) per decade. The slope is a straight line fitted to 42 complete years; the brackets give its 95 percent interval.
Fitted temperature trends per decade at Chillicothe
Measure
Per decade (C)
Per decade (F)
Period
Complete years
Reading
Annual mean temperature
-0.17 C (-0.34 to 0.00) per decade
-0.31 F (-0.62 to 0.00) per decade
1925 to 1971
42
Fall
Mean daily maximum
-0.21 C (-0.41 to 0.00) per decade
-0.37 F (-0.74 to -0.01) per decade
1925 to 1971
42
Fall
Mean daily minimum
-0.14 C (-0.31 to 0.03) per decade
-0.2 F (-0.6 to 0.1) per decade
1925 to 1971
42
Not clearly different from zero
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
1897 to 1972
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)
42.8 C (109.0 F)
1934
36.7 C (98.1 F)
58
Coldest night (TNn)
-27.8 C (-18.0 F)
1951
-18.9 C (-2.0 F)
58
Wettest day (Rx1day)
121.9 mm (4.8 in)
1968
52.3 mm (2.1 in)
58
Wettest five days (Rx5day)
185.1 mm (7.3 in)
1968
85.1 mm (3.4 in)
58
Longest dry spell (CDD)
44 days
1963
17 days
58
Hottest day (TXx)
The hottest day of the year at Chillicothe, 1897 to 1972. The record is 42.8 C (109.0 F) in 1934, marked on the chart; the median year is 36.7 C (98.1 F).
Hottest day (TXx) at Chillicothe by year
Year
Hottest day (TXx)
1897
20.0 C (68.0 F)
1898
34.4 C (93.9 F)
1899
37.2 C (99.0 F)
1901
29.4 C (84.9 F)
1903
37.2 C (99.0 F)
1904
34.4 C (93.9 F)
1905
34.4 C (93.9 F)
1906
29.4 C (84.9 F)
1923
36.7 C (98.1 F)
1924
38.3 C (100.9 F)
1925
37.2 C (99.0 F)
1926
37.8 C (100.0 F)
1927
37.2 C (99.0 F)
1928
35.6 C (96.1 F)
1929
35.0 C (95.0 F)
1930
40.6 C (105.1 F)
1931
38.9 C (102.0 F)
1932
38.9 C (102.0 F)
1933
39.4 C (102.9 F)
1934
42.8 C (109.0 F)
1935
35.6 C (96.1 F)
1936
40.6 C (105.1 F)
1937
36.7 C (98.1 F)
1938
35.6 C (96.1 F)
1939
38.9 C (102.0 F)
1940
39.4 C (102.9 F)
1941
38.3 C (100.9 F)
1942
36.1 C (97.0 F)
1943
36.7 C (98.1 F)
1944
38.3 C (100.9 F)
1945
35.6 C (96.1 F)
1946
35.6 C (96.1 F)
1947
35.0 C (95.0 F)
1948
38.3 C (100.9 F)
1949
36.7 C (98.1 F)
1950
35.0 C (95.0 F)
1951
36.1 C (97.0 F)
1952
38.3 C (100.9 F)
1953
38.3 C (100.9 F)
1954
38.9 C (102.0 F)
1955
36.1 C (97.0 F)
1956
35.0 C (95.0 F)
1957
36.1 C (97.0 F)
1958
33.3 C (91.9 F)
1959
36.1 C (97.0 F)
1960
35.6 C (96.1 F)
1961
34.4 C (93.9 F)
1962
37.8 C (100.0 F)
1963
37.2 C (99.0 F)
1964
37.2 C (99.0 F)
1965
36.7 C (98.1 F)
1966
37.8 C (100.0 F)
1967
36.1 C (97.0 F)
1968
36.1 C (97.0 F)
1969
36.7 C (98.1 F)
1970
36.1 C (97.0 F)
1971
36.1 C (97.0 F)
1972
20.6 C (69.1 F)
Coldest night (TNn)
The coldest night of the year at Chillicothe, 1897 to 1972. The record is -27.8 C (-18.0 F) in 1951, marked on the chart; the median year is -18.9 C (-2.0 F).
Coldest night (TNn) at Chillicothe by year
Year
Coldest night (TNn)
1897
-7.8 C (18.0 F)
1898
-19.4 C (-2.9 F)
1899
-12.8 C (9.0 F)
1901
-2.8 C (27.0 F)
1903
-5.6 C (21.9 F)
1904
-20.0 C (-4.0 F)
1905
-8.9 C (16.0 F)
1906
-18.9 C (-2.0 F)
1923
-17.8 C (0.0 F)
1924
-18.9 C (-2.0 F)
1925
-23.3 C (-9.9 F)
1926
-23.3 C (-9.9 F)
1927
-17.2 C (1.0 F)
1928
-18.3 C (-0.9 F)
1929
-17.2 C (1.0 F)
1930
-20.6 C (-5.1 F)
1931
-8.3 C (17.1 F)
1932
-20.6 C (-5.1 F)
1933
-20.0 C (-4.0 F)
1934
-22.2 C (-8.0 F)
1935
-20.6 C (-5.1 F)
1936
-26.7 C (-16.1 F)
1937
-17.2 C (1.0 F)
1938
-14.4 C (6.1 F)
1939
-16.1 C (3.0 F)
1940
-22.8 C (-9.0 F)
1941
-13.9 C (7.0 F)
1942
-22.8 C (-9.0 F)
1943
-24.4 C (-11.9 F)
1944
-17.8 C (0.0 F)
1945
-17.8 C (0.0 F)
1946
-16.7 C (1.9 F)
1947
-18.3 C (-0.9 F)
1948
-26.1 C (-15.0 F)
1949
-14.4 C (6.1 F)
1950
-18.9 C (-2.0 F)
1951
-27.8 C (-18.0 F)
1952
-13.9 C (7.0 F)
1953
-15.0 C (5.0 F)
1954
-15.6 C (3.9 F)
1955
-18.9 C (-2.0 F)
1956
-14.4 C (6.1 F)
1957
-22.2 C (-8.0 F)
1958
-20.6 C (-5.1 F)
1959
-20.6 C (-5.1 F)
1960
-18.3 C (-0.9 F)
1961
-21.1 C (-6.0 F)
1962
-21.7 C (-7.1 F)
1963
-25.6 C (-14.1 F)
1964
-22.2 C (-8.0 F)
1965
-20.0 C (-4.0 F)
1966
-18.9 C (-2.0 F)
1967
-18.3 C (-0.9 F)
1968
-23.3 C (-9.9 F)
1969
-16.7 C (1.9 F)
1970
-18.9 C (-2.0 F)
1971
-21.1 C (-6.0 F)
1972
-23.3 C (-9.9 F)
Wettest day (Rx1day)
The wettest day of the year at Chillicothe, 1897 to 1972. The record is 121.9 mm (4.8 in) in 1968, marked on the chart; the median year is 52.3 mm (2.1 in).
Wettest day (Rx1day) at Chillicothe by year
Year
Wettest day (Rx1day)
1897
33.0 mm (1.3 in)
1898
50.8 mm (2.0 in)
1899
43.2 mm (1.7 in)
1901
40.6 mm (1.6 in)
1903
52.1 mm (2.1 in)
1904
35.3 mm (1.4 in)
1905
75.2 mm (3.0 in)
1906
23.9 mm (0.9 in)
1923
46.0 mm (1.8 in)
1924
40.1 mm (1.6 in)
1925
63.5 mm (2.5 in)
1926
59.7 mm (2.4 in)
1927
41.1 mm (1.6 in)
1928
53.3 mm (2.1 in)
1929
50.0 mm (2.0 in)
1930
32.0 mm (1.3 in)
1931
54.6 mm (2.1 in)
1932
64.8 mm (2.6 in)
1933
66.8 mm (2.6 in)
1934
41.4 mm (1.6 in)
1935
76.2 mm (3.0 in)
1936
46.0 mm (1.8 in)
1937
99.6 mm (3.9 in)
1938
43.9 mm (1.7 in)
1939
39.9 mm (1.6 in)
1940
57.4 mm (2.3 in)
1941
55.1 mm (2.2 in)
1942
50.5 mm (2.0 in)
1943
81.5 mm (3.2 in)
1944
41.4 mm (1.6 in)
1945
55.1 mm (2.2 in)
1946
52.3 mm (2.1 in)
1947
109.2 mm (4.3 in)
1948
75.7 mm (3.0 in)
1949
38.9 mm (1.5 in)
1950
54.1 mm (2.1 in)
1951
48.8 mm (1.9 in)
1952
63.8 mm (2.5 in)
1953
52.3 mm (2.1 in)
1954
54.4 mm (2.1 in)
1955
36.3 mm (1.4 in)
1956
48.8 mm (1.9 in)
1957
42.9 mm (1.7 in)
1958
47.2 mm (1.9 in)
1959
50.0 mm (2.0 in)
1960
38.4 mm (1.5 in)
1961
38.4 mm (1.5 in)
1962
76.7 mm (3.0 in)
1963
99.8 mm (3.9 in)
1964
105.4 mm (4.1 in)
1965
72.6 mm (2.9 in)
1966
53.3 mm (2.1 in)
1967
55.9 mm (2.2 in)
1968
121.9 mm (4.8 in)
1969
78.7 mm (3.1 in)
1970
55.9 mm (2.2 in)
1971
90.7 mm (3.6 in)
1972
12.7 mm (0.5 in)
Wettest five days (Rx5day)
The wettest five days of the year at Chillicothe, 1897 to 1972. The record is 185.1 mm (7.3 in) in 1968, marked on the chart; the median year is 85.1 mm (3.4 in).
Wettest five days (Rx5day) at Chillicothe by year
Year
Wettest five days (Rx5day)
1897
55.9 mm (2.2 in)
1898
85.1 mm (3.4 in)
1899
61.3 mm (2.4 in)
1901
86.9 mm (3.4 in)
1903
59.2 mm (2.3 in)
1904
61.0 mm (2.4 in)
1905
108.0 mm (4.3 in)
1906
37.4 mm (1.5 in)
1923
60.2 mm (2.4 in)
1924
83.5 mm (3.3 in)
1925
69.9 mm (2.8 in)
1926
178.3 mm (7.0 in)
1927
88.9 mm (3.5 in)
1928
85.9 mm (3.4 in)
1929
84.3 mm (3.3 in)
1930
43.1 mm (1.7 in)
1931
88.9 mm (3.5 in)
1932
70.4 mm (2.8 in)
1933
146.0 mm (5.7 in)
1934
83.8 mm (3.3 in)
1935
111.7 mm (4.4 in)
1936
96.7 mm (3.8 in)
1937
179.6 mm (7.1 in)
1938
85.0 mm (3.3 in)
1939
93.5 mm (3.7 in)
1940
106.4 mm (4.2 in)
1941
122.1 mm (4.8 in)
1942
69.8 mm (2.7 in)
1943
97.5 mm (3.8 in)
1944
59.3 mm (2.3 in)
1945
99.3 mm (3.9 in)
1946
81.5 mm (3.2 in)
1947
112.5 mm (4.4 in)
1948
145.3 mm (5.7 in)
1949
75.4 mm (3.0 in)
1950
112.0 mm (4.4 in)
1951
82.6 mm (3.3 in)
1952
99.6 mm (3.9 in)
1953
77.7 mm (3.1 in)
1954
71.1 mm (2.8 in)
1955
59.6 mm (2.3 in)
1956
61.0 mm (2.4 in)
1957
66.8 mm (2.6 in)
1958
88.6 mm (3.5 in)
1959
85.1 mm (3.4 in)
1960
54.9 mm (2.2 in)
1961
95.8 mm (3.8 in)
1962
99.8 mm (3.9 in)
1963
123.4 mm (4.9 in)
1964
154.2 mm (6.1 in)
1965
97.7 mm (3.8 in)
1966
100.7 mm (4.0 in)
1967
78.2 mm (3.1 in)
1968
185.1 mm (7.3 in)
1969
82.8 mm (3.3 in)
1970
69.8 mm (2.7 in)
1971
91.5 mm (3.6 in)
1972
22.4 mm (0.9 in)
Longest dry spell (CDD)
The longest dry spell of the year at Chillicothe, 1897 to 1972. The record is 44 days in 1963, marked on the chart; the median year is 17 days.
Longest dry spell (CDD) at Chillicothe by year
Year
Longest dry spell (CDD)
1897
5 days
1898
12 days
1899
28 days
1901
5 days
1903
20 days
1904
19 days
1905
13 days
1906
18 days
1923
16 days
1924
27 days
1925
19 days
1926
11 days
1927
20 days
1928
17 days
1929
13 days
1930
19 days
1931
18 days
1932
15 days
1933
15 days
1934
20 days
1935
17 days
1936
26 days
1937
13 days
1938
18 days
1939
21 days
1940
14 days
1941
23 days
1942
18 days
1943
20 days
1944
18 days
1945
17 days
1946
17 days
1947
16 days
1948
19 days
1949
11 days
1950
12 days
1951
15 days
1952
22 days
1953
25 days
1954
16 days
1955
18 days
1956
15 days
1957
18 days
1958
13 days
1959
19 days
1960
13 days
1961
13 days
1962
15 days
1963
44 days
1964
23 days
1965
17 days
1966
30 days
1967
25 days
1968
18 days
1969
16 days
1970
14 days
1971
13 days
1972
8 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
42 years with a frost
Across 42 years with a frost, the median last spring frost at Chillicothe falls on 23 April and the median first autumn frost on 17 October, which leaves a median of 178 days between them.
Fitted over all years, the growing season changes by +0.4 days per decade at this station.
Frost dates and growing season at Chillicothe
Measure
Median, all years
Earliest period
Recent period (1941 to 1971)
Recent against earliest
Fitted trend
Last spring frost
23 April
n/a
23 April
n/a
+0.6 days per decade
First autumn frost
17 October
n/a
17 October
n/a
+1.0 days per decade
Growing days
178 days
n/a
178 days
n/a
+0.4 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
49 years, 1923 to 1971
A day with at least 54.2 mm (2.1 in) of rain is expected about once in 2 years. A day with at least 143.7 mm (5.7 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
54.2 mm (2.1 in)
5 years
71.9 mm (2.8 in)
10 years
85.7 mm (3.4 in)
25 years
106.2 mm (4.2 in)
50 years
123.8 mm (4.9 in)
Longer than the 49 years of record
100 years
143.7 mm (5.7 in)
Longer than the 49 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, 49 years of values from 1923 to 1971.
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 1968; 109.2 mm (4.3 in) in 1947; 105.4 mm (4.1 in) in 1964.
Station Changes
No change in the annual mean temperature of this station was found against its neighbours.
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 2026-10-15 (15 October 2026). Records are computed by this site and are not official.