Ravenna Lock 12 Threshold Days by Year (USC00156679)

5 fixed thresholds counted per year at Ravenna Lock 12 (USC00156679): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Ravenna Lock 12 Thresholds

Ravenna Lock 12: days with 10 mm (0.39 in) or more of precipitation in 54 years, most in 1974 with 55.
Ravenna Lock 12: days with 25 mm (0.98 in) or more of precipitation in 53 years, most in 1974 with 21.
Ravenna Lock 12: days with 50 mm (1.97 in) or more of precipitation in 46 years, most in 1924 with 5.
Ravenna Lock 12: days with 10 cm (3.9 in) or more of snowfall in 11 years, most in 1954 with 2.
5 fixed thresholds have at least one qualifying day at Ravenna Lock 12.

Days with 10 mm (0.39 in) or more of precipitation

54 years with a qualifying day

Days per year at Ravenna Lock 12 with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 55 in 1974.

Days with 10 mm (0.39 in) or more of precipitation per year at Ravenna Lock 12
Year	Days	Decade average
1924	40	41.3
1925	33	41.3
1926	47	41.3
1927	48	41.3
1928	36	41.3
1929	44	41.3
1930	16	37.8
1931	40	37.8
1932	44	37.8
1933	43	37.8
1934	31	37.8
1935	51	37.8
1936	29	37.8
1937	41	37.8
1938	41	37.8
1939	42	37.8
1940	33	36.1
1941	30	36.1
1942	46	36.1
1943	38	36.1
1944	37	36.1
1945	32	36.1
1946	43	36.1
1947	38	36.1
1948	38	36.1
1949	26	36.1
1950	45	38.6
1951	40	38.6
1952	41	38.6
1953	36	38.6
1954	34	38.6
1955	34	38.6
1956	45	38.6
1957	44	38.6
1958	41	38.6
1959	26	38.6
1960	35	37
1961	43	37
1962	53	37
1963	29	37
1964	32	37
1965	29	37
1966	40	37
1967	38	37
1968	41	37
1969	30	37
1970	33	43.1
1971	33	43.1
1972	54	43.1
1973	48	43.1
1974	55	43.1
1975	48	43.1
1976	37	43.1
1978	37	43.1

For each year, a bar from the first to the last day at Ravenna Lock 12 meeting 10 mm (0.39 in).

First to last qualifying date each year at Ravenna Lock 12
Year	First date	Last date
1924	1924-01-03	1924-12-09
1925	1925-01-20	1925-11-27
1926	1926-01-18	1926-12-26
1927	1927-01-20	1927-12-16
1928	1928-02-23	1928-12-05
1929	1929-01-10	1929-12-28
1930	1930-01-03	1930-09-25
1931	1931-01-06	1931-12-22
1932	1932-01-13	1932-12-31
1933	1933-01-09	1933-12-20
1934	1934-01-07	1934-12-26
1935	1935-01-16	1935-12-08
1936	1936-01-02	1936-12-31
1937	1937-01-02	1937-10-22
1938	1938-01-21	1938-12-27
1939	1939-01-13	1939-12-24
1940	1940-02-10	1940-12-29
1941	1941-01-16	1941-12-13
1942	1942-01-01	1942-12-30
1943	1943-01-25	1943-12-29
1944	1944-01-03	1944-12-28
1945	1945-01-01	1945-12-05
1946	1946-01-07	1946-12-29
1947	1947-01-01	1947-12-16
1948	1948-01-01	1948-12-16
1949	1949-01-05	1949-12-13
1950	1950-01-03	1950-12-07
1951	1951-01-04	1951-12-26
1952	1952-01-02	1952-12-31
1953	1953-01-07	1953-12-14
1954	1954-01-10	1954-12-30
1955	1955-01-05	1955-12-02
1956	1956-01-29	1956-12-24
1957	1957-01-05	1957-12-26
1958	1958-02-01	1958-11-29
1959	1959-01-16	1959-12-28
1960	1960-01-15	1960-12-30
1961	1961-01-01	1961-12-18
1962	1962-01-06	1962-12-30
1963	1963-01-12	1963-12-23
1964	1964-01-01	1964-12-26
1965	1965-01-09	1965-11-27
1966	1966-01-02	1966-12-28
1967	1967-01-27	1967-12-22
1968	1968-01-01	1968-12-28
1969	1969-01-20	1969-12-31
1970	1970-02-02	1970-12-22
1971	1971-01-05	1971-12-07
1972	1972-01-02	1972-12-15
1973	1973-01-04	1973-12-31
1974	1974-01-03	1974-12-31
1975	1975-01-01	1975-12-31
1976	1976-01-01	1976-12-07
1978	1978-01-17	1978-12-09

Every Fixed Threshold

Fixed thresholds at Ravenna Lock 12
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
10 mm (0.39 in): Days with 10 mm or more rain	54	55	1974	37
25 mm (0.98 in): Days with 25 mm or more rain	53	21	1974	11
50 mm (1.97 in): Days with 50 mm or more rain	46	5	1924	4
100 mm (3.94 in): Days with 100 mm or more rain	4	1	1949	1
10 cm (3.9 in): Days with 10 cm or more snowfall	11	2	1954	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1924.

Download the Data

Data for Ravenna Lock 12 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).

Ravenna Lock 12 Threshold Days by Year (USC00156679)

Key Facts for Ravenna Lock 12 Thresholds

Days with 10 mm (0.39 in) or more of precipitation

Every Fixed Threshold

Download the Data

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