Ariel Dam Threshold Days by Year (USC00450242)

5 fixed thresholds counted per year at Ariel Dam (USC00450242): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Ariel Dam Thresholds

Ariel Dam: days with 10 mm (0.39 in) or more of precipitation in 32 years, most in 1968 with 84.
Ariel Dam: days with 25 mm (0.98 in) or more of precipitation in 32 years, most in 1959 with 27.
Ariel Dam: days with 50 mm (1.97 in) or more of precipitation in 27 years, most in 1946 with 6.
Ariel Dam: days with 10 cm (3.9 in) or more of snowfall in 6 years, most in 1949 with 8.
5 fixed thresholds have at least one qualifying day at Ariel Dam.

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

32 years with a qualifying day

Days per year at Ariel Dam with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 84 in 1968.

Days with 10 mm (0.39 in) or more of precipitation per year at Ariel Dam
Year	Days	Decade average
1932	68	65
1936	62	65
1937	77	65
1939	53	65
1941	68	62.1
1944	45	62.1
1945	69	62.1
1946	63	62.1
1947	73	62.1
1948	66	62.1
1949	51	62.1
1950	73	66.9
1951	67	66.9
1952	42	66.9
1953	73	66.9
1954	63	66.9
1955	75	66.9
1956	70	66.9
1957	58	66.9
1958	76	66.9
1959	72	66.9
1960	75	69
1961	78	69
1962	61	69
1963	66	69
1964	81	69
1965	53	69
1966	72	69
1967	63	69
1968	84	69
1969	57	69
1970	77	77

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

First to last qualifying date each year at Ariel Dam
Year	First date	Last date
1932	1932-01-03	1932-11-30
1936	1936-01-02	1936-12-29
1937	1937-01-15	1937-12-30
1939	1939-01-01	1939-12-30
1941	1941-01-05	1941-12-23
1944	1944-01-01	1944-12-28
1945	1945-01-06	1945-12-30
1946	1946-01-02	1946-12-15
1947	1947-01-10	1947-12-29
1948	1948-01-01	1948-12-31
1949	1949-01-01	1949-12-31
1950	1950-01-04	1950-12-30
1951	1951-01-02	1951-12-29
1952	1952-01-08	1952-12-30
1953	1953-01-01	1953-12-28
1954	1954-01-03	1954-12-31
1955	1955-01-05	1955-12-27
1956	1956-01-01	1956-12-21
1957	1957-01-02	1957-12-28
1958	1958-01-12	1958-12-30
1959	1959-01-01	1959-12-25
1960	1960-01-06	1960-12-26
1961	1961-01-01	1961-12-26
1962	1962-01-02	1962-12-30
1963	1963-01-02	1963-12-28
1964	1964-01-01	1964-12-30
1965	1965-01-02	1965-12-31
1966	1966-01-02	1966-12-31
1967	1967-01-01	1967-12-26
1968	1968-01-01	1968-12-27
1969	1969-01-01	1969-12-26
1970	1970-01-09	1970-12-31

Every Fixed Threshold

Fixed thresholds at Ariel 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	32	84	1968	77
25 mm (0.98 in): Days with 25 mm or more rain	32	27	1959	25
50 mm (1.97 in): Days with 50 mm or more rain	27	6	1946	1
100 mm (3.94 in): Days with 100 mm or more rain	2	1	1961	1
10 cm (3.9 in): Days with 10 cm or more snowfall	6	8	1949	2

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 Ariel 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).

Ariel Dam Threshold Days by Year (USC00450242)

Key Facts for Ariel Dam Thresholds

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

Every Fixed Threshold

Download the Data

Related