Chillicothe Threshold Days by Year (USC00331523)

17 fixed thresholds counted per year at Chillicothe (USC00331523): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Chillicothe Thresholds

Chillicothe: days with 10 mm (0.39 in) or more of precipitation in 49 years, most in 1927 with 45.
Chillicothe: days with 25 mm (0.98 in) or more of precipitation in 49 years, most in 1935 with 15.
Chillicothe: nights with a minimum temperature at or below 0 C (32 F) in 48 years, most in 1969 with 151.
Chillicothe: nights with a minimum temperature at or above 20 C (68 F) in 48 years, most in 1931 with 41.
17 fixed thresholds have at least one qualifying day at Chillicothe.

Days at or above 30 C (86 F)

47 years with a qualifying day

Days per year at Chillicothe with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 101 in 1959.

Days at or above 30 C (86 F) per year at Chillicothe
Year	Days	Decade average
1923	64	70.3
1925	87	70.3
1926	71	70.3
1927	65	70.3
1928	69	70.3
1929	66	70.3
1930	93	84.9
1931	80	84.9
1932	82	84.9
1933	81	84.9
1934	95	84.9
1935	66	84.9
1936	100	84.9
1937	79	84.9
1938	78	84.9
1939	95	84.9
1940	69	72.5
1941	85	72.5
1942	77	72.5
1943	69	72.5
1944	97	72.5
1945	64	72.5
1946	51	72.5
1947	63	72.5
1948	70	72.5
1949	80	72.5
1950	37	64.2
1951	71	64.2
1952	79	64.2
1953	77	64.2
1954	69	64.2
1955	67	64.2
1956	42	64.2
1957	63	64.2
1958	36	64.2
1959	101	64.2
1960	54	61.4
1961	60	61.4
1962	64	61.4
1963	54	61.4
1964	72	61.4
1965	63	61.4
1966	69	61.4
1967	53	61.4
1969	64	61.4
1970	77	65.5
1971	54	65.5

For each year, a bar from the first to the last day at Chillicothe meeting 30 C (86 F).

First to last qualifying date each year at Chillicothe
Year	First date	Last date
1923	1923-05-31	1923-09-28
1925	1925-04-24	1925-09-29
1926	1926-05-02	1926-10-05
1927	1927-05-10	1927-10-30
1928	1928-05-04	1928-10-18
1929	1929-03-26	1929-09-30
1930	1930-04-11	1930-10-14
1931	1931-05-18	1931-10-07
1932	1932-05-05	1932-09-19
1933	1933-05-20	1933-09-26
1934	1934-05-04	1934-09-26
1935	1935-04-27	1935-10-14
1936	1936-05-07	1936-09-27
1937	1937-04-23	1937-10-01
1938	1938-04-27	1938-10-18
1939	1939-05-06	1939-10-10
1940	1940-05-06	1940-10-13
1941	1941-04-13	1941-10-07
1942	1942-04-26	1942-09-19
1943	1943-05-06	1943-09-30
1944	1944-05-11	1944-10-06
1945	1945-03-25	1945-09-28
1946	1946-04-22	1946-10-07
1947	1947-04-05	1947-10-23
1948	1948-04-24	1948-09-19
1949	1949-05-03	1949-10-11
1950	1950-03-27	1950-10-31
1951	1951-04-28	1951-10-05
1952	1952-04-21	1952-10-01
1953	1953-05-10	1953-10-19
1954	1954-04-07	1954-10-11
1955	1955-05-03	1955-09-19
1956	1956-04-28	1956-09-13
1957	1957-04-20	1957-09-21
1958	1958-05-18	1958-09-26
1959	1959-05-02	1959-10-05
1960	1960-04-22	1960-09-25
1961	1961-05-14	1961-09-25
1962	1962-04-27	1962-09-14
1963	1963-05-09	1963-10-08
1964	1964-05-07	1964-09-17
1965	1965-05-02	1965-09-23
1966	1966-05-09	1966-09-04
1967	1967-05-27	1967-09-21
1969	1969-04-18	1969-10-14
1970	1970-04-30	1970-09-27
1971	1971-05-19	1971-10-04

Every Fixed Threshold

Fixed thresholds at Chillicothe
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	47	101	1959	54
35 C (95 F): Days	45	37	1936	1
40 C (104 F): Days	3	4	1930	3
90 F (32.2 C): Days	47	71	1936	13
100 F (37.8 C): Days	17	12	1936	2
0 C (32 F): Ice days (max	46	46	1963	27
0 C (32 F): Frost days (min	48	151	1969	130
-10 C (14 F): Days with min	47	50	1963	26
-20 C (-4 F): Days with min	22	10	1936	1
20 C (68 F): Tropical nights (min	48	41	1931	4
25 C (77 F): Days with min	5	2	1934	1
10 mm (0.39 in): Days with 10 mm or more rain	49	45	1927	33
25 mm (0.98 in): Days with 25 mm or more rain	49	15	1935	8
50 mm (1.97 in): Days with 50 mm or more rain	32	5	1948	3
100 mm (3.94 in): Days with 100 mm or more rain	3	1	1947	1
10 cm (3.9 in): Days with 10 cm or more snowfall	20	6	1960	1
25 cm (9.8 in): Days with 25 cm or more snowfall	1	1	1940	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1923.

Download the Data

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 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Chillicothe Threshold Days by Year (USC00331523)

Key Facts for Chillicothe Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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