North River Dam Threshold Days by Year (USC00446199)

6 fixed thresholds counted per year at North River Dam (USC00446199): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for North River Dam Thresholds

North River Dam: days with 10 mm (0.39 in) or more of precipitation in 35 years, most in 1951 with 51.
North River Dam: days with 25 mm (0.98 in) or more of precipitation in 35 years, most in 1932 with 17.
North River Dam: days with 50 mm (1.97 in) or more of precipitation in 30 years, most in 1935 with 5.
North River Dam: days with 10 cm (3.9 in) or more of snowfall in 8 years, most in 1978 with 5.
6 fixed thresholds have at least one qualifying day at North River Dam.

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

35 years with a qualifying day

Days per year at North River Dam with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 51 in 1951.

Days with 10 mm (0.39 in) or more of precipitation per year at North River Dam
Year	Days	Decade average
1932	33	33.5
1933	31	33.5
1935	36	33.5
1936	35	33.5
1938	31	33.5
1939	35	33.5
1940	49	41.1
1943	38	41.1
1944	44	41.1
1945	35	41.1
1946	26	41.1
1948	46	41.1
1949	50	41.1
1950	33	37.3
1951	51	37.3
1952	40	37.3
1957	32	37.3
1958	32	37.3
1959	36	37.3
1960	30	33.3
1961	38	33.3
1962	38	33.3
1963	26	33.3
1964	31	33.3
1965	36	33.3
1966	35	33.3
1967	31	33.3
1968	23	33.3
1969	45	33.3
1970	33	37.3
1971	34	37.3
1972	47	37.3
1973	35	37.3
1975	39	37.3
1976	36	37.3

For each year, a bar from the first to the last day at North River Dam meeting 10 mm (0.39 in).

First to last qualifying date each year at North River Dam
Year	First date	Last date
1932	1932-01-01	1932-12-28
1933	1933-01-09	1933-12-26
1935	1935-01-08	1935-12-29
1936	1936-01-03	1936-12-31
1938	1938-01-07	1938-12-26
1939	1939-01-12	1939-12-26
1940	1940-01-14	1940-12-29
1943	1943-01-28	1943-12-29
1944	1944-01-03	1944-12-28
1945	1945-01-01	1945-12-25
1946	1946-01-07	1946-12-21
1948	1948-01-01	1948-12-30
1949	1949-01-04	1949-12-27
1950	1950-01-23	1950-12-07
1951	1951-01-14	1951-12-22
1952	1952-01-04	1952-12-31
1957	1957-01-23	1957-12-26
1958	1958-01-14	1958-12-29
1959	1959-01-02	1959-12-18
1960	1960-01-03	1960-12-11
1961	1961-01-01	1961-12-28
1962	1962-01-06	1962-12-28
1963	1963-01-26	1963-12-23
1964	1964-01-01	1964-12-27
1965	1965-01-11	1965-10-22
1966	1966-01-02	1966-12-23
1967	1967-01-27	1967-12-28
1968	1968-01-14	1968-12-28
1969	1969-01-21	1969-12-30
1970	1970-02-02	1970-12-31
1971	1971-01-01	1971-12-07
1972	1972-01-02	1972-12-22
1973	1973-01-22	1973-12-26
1975	1975-01-07	1975-12-31
1976	1976-01-01	1976-12-11

Every Fixed Threshold

Fixed thresholds at North River Dam
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	35	51	1951	36
25 mm (0.98 in): Days with 25 mm or more rain	35	17	1932	17
50 mm (1.97 in): Days with 50 mm or more rain	30	5	1935	3
100 mm (3.94 in): Days with 100 mm or more rain	6	2	1972	2
10 cm (3.9 in): Days with 10 cm or more snowfall	8	5	1978	5
25 cm (9.8 in): Days with 25 cm or more snowfall	3	2	1975	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1932.

Download the Data

Data for North River Dam 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).

North River Dam Threshold Days by Year (USC00446199)

Key Facts for North River Dam Thresholds

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

Every Fixed Threshold

Download the Data

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