Willow Lock 13 Threshold Days by Year (USC00158724)

5 fixed thresholds counted per year at Willow Lock 13 (USC00158724): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Willow Lock 13 Thresholds

Willow Lock 13: days with 10 mm (0.39 in) or more of precipitation in 50 years, most in 1972 with 54.
Willow Lock 13: days with 25 mm (0.98 in) or more of precipitation in 50 years, most in 1935 with 18.
Willow Lock 13: days with 50 mm (1.97 in) or more of precipitation in 47 years, most in 1935 with 6.
Willow Lock 13: days with 10 cm (3.9 in) or more of snowfall in 6 years, most in 1966 with 3.
5 fixed thresholds have at least one qualifying day at Willow Lock 13.

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

50 years with a qualifying day

Days per year at Willow Lock 13 with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 54 in 1972.

Days with 10 mm (0.39 in) or more of precipitation per year at Willow Lock 13
Year	Days	Decade average
1924	40	42
1925	33	42
1926	51	42
1927	44	42
1931	31	37.7
1932	37	37.7
1933	43	37.7
1934	30	37.7
1935	47	37.7
1936	31	37.7
1937	41	37.7
1938	40	37.7
1939	39	37.7
1940	34	39.4
1941	26	39.4
1942	39	39.4
1943	38	39.4
1944	39	39.4
1945	45	39.4
1946	48	39.4
1947	38	39.4
1948	48	39.4
1950	49	38.9
1951	42	38.9
1952	27	38.9
1953	37	38.9
1954	37	38.9
1955	40	38.9
1956	44	38.9
1957	45	38.9
1958	42	38.9
1959	26	38.9
1960	38	36.9
1961	43	36.9
1962	48	36.9
1963	35	36.9
1964	37	36.9
1965	32	36.9
1966	36	36.9
1967	38	36.9
1968	35	36.9
1969	27	36.9
1970	33	44.1
1971	36	44.1
1972	54	44.1
1973	51	44.1
1974	50	44.1
1975	45	44.1
1976	34	44.1
1979	50	44.1

For each year, a bar from the first to the last day at Willow Lock 13 meeting 10 mm (0.39 in).

First to last qualifying date each year at Willow Lock 13
Year	First date	Last date
1924	1924-01-03	1924-12-24
1925	1925-01-11	1925-11-27
1926	1926-01-13	1926-12-27
1927	1927-01-20	1927-12-31
1931	1931-01-07	1931-12-13
1932	1932-01-02	1932-12-30
1933	1933-01-08	1933-12-25
1934	1934-01-06	1934-12-28
1935	1935-01-08	1935-12-29
1936	1936-01-01	1936-12-31
1937	1937-01-02	1937-12-18
1938	1938-01-21	1938-12-27
1939	1939-01-05	1939-12-24
1940	1940-01-14	1940-12-29
1941	1941-01-16	1941-12-24
1942	1942-01-01	1942-12-30
1943	1943-01-26	1943-12-26
1944	1944-01-03	1944-12-28
1945	1945-01-01	1945-12-24
1946	1946-01-07	1946-12-21
1947	1947-01-01	1947-12-16
1948	1948-01-01	1948-12-16
1950	1950-01-05	1950-12-07
1951	1951-01-04	1951-12-26
1952	1952-01-03	1952-12-10
1953	1953-01-07	1953-12-14
1954	1954-01-10	1954-12-30
1955	1955-01-05	1955-12-04
1956	1956-01-29	1956-12-22
1957	1957-01-05	1957-12-26
1958	1958-01-14	1958-11-19
1959	1959-01-16	1959-12-28
1960	1960-01-03	1960-12-30
1961	1961-01-01	1961-12-18
1962	1962-01-06	1962-12-30
1963	1963-01-11	1963-12-23
1964	1964-01-01	1964-12-25
1965	1965-01-09	1965-11-27
1966	1966-01-02	1966-12-28
1967	1967-01-14	1967-12-22
1968	1968-03-10	1968-12-28
1969	1969-01-20	1969-12-31
1970	1970-02-09	1970-12-22
1971	1971-01-04	1971-12-07
1972	1972-01-02	1972-12-22
1973	1973-01-04	1973-12-31
1974	1974-01-03	1974-12-28
1975	1975-01-11	1975-12-26
1976	1976-01-01	1976-12-07
1979	1979-01-01	1979-12-13

Every Fixed Threshold

Fixed thresholds at Willow Lock 13
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	50	54	1972	50
25 mm (0.98 in): Days with 25 mm or more rain	50	18	1935	13
50 mm (1.97 in): Days with 50 mm or more rain	47	6	1935	2
100 mm (3.94 in): Days with 100 mm or more rain	5	1	1938	1
10 cm (3.9 in): Days with 10 cm or more snowfall	6	3	1966	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 Willow Lock 13 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).

Willow Lock 13 Threshold Days by Year (USC00158724)

Key Facts for Willow Lock 13 Thresholds

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

Every Fixed Threshold

Download the Data

Related