Mount Wilson (Nooroo) Threshold Days by Year (ASN00063057)

5 fixed thresholds counted per year at Mount Wilson (Nooroo) (ASN00063057): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Mount Wilson (Nooroo) Thresholds

Mount Wilson (Nooroo): days with 10 mm (0.39 in) or more of precipitation in 76 years, most in 1950 with 71.
Mount Wilson (Nooroo): days with 25 mm (0.98 in) or more of precipitation in 76 years, most in 1950 with 30.
Mount Wilson (Nooroo): days with 50 mm (1.97 in) or more of precipitation in 71 years, most in 1963 with 10.
Mount Wilson (Nooroo): days with 100 mm (3.94 in) or more of precipitation in 40 years, most in 1942 with 4.
5 fixed thresholds have at least one qualifying day at Mount Wilson (Nooroo).

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

76 years with a qualifying day

Days per year at Mount Wilson (Nooroo) with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 71 in 1950.

Days with 10 mm (0.39 in) or more of precipitation per year at Mount Wilson (Nooroo)
Year	Days	Decade average
1888	17	29.5
1889	42	29.5
1890	59	39.7
1891	49	39.7
1892	46	39.7
1893	48	39.7
1894	46	39.7
1895	27	39.7
1896	30	39.7
1897	23	39.7
1898	33	39.7
1899	36	39.7
1900	36	29.2
1901	25	29.2
1902	27	29.2
1903	39	29.2
1904	37	29.2
1905	24	29.2
1906	26	29.2
1907	23	29.2
1908	33	29.2
1909	22	29.2
1910	26	26
1925	31	34.8
1926	38	34.8
1927	29	34.8
1928	37	34.8
1929	39	34.8
1930	38	35.8
1931	36	35.8
1933	39	35.8
1934	56	35.8
1935	24	35.8
1936	32	35.8
1937	36	35.8
1938	35	35.8
1939	26	35.8
1940	19	32.7
1941	26	32.7
1942	31	32.7
1943	44	32.7
1944	18	32.7
1945	31	32.7
1946	28	32.7
1947	46	32.7
1948	35	32.7
1949	49	32.7
1950	71	40.4
1951	41	40.4
1952	38	40.4
1953	18	40.4
1954	36	40.4
1955	45	40.4
1956	51	40.4
1957	24	40.4
1958	33	40.4
1959	47	40.4
1960	37	36.1
1961	45	36.1
1962	43	36.1
1963	56	36.1
1964	32	36.1
1965	19	36.1
1966	27	36.1
1967	43	36.1
1968	20	36.1
1969	39	36.1
1970	35	40.8
1971	42	40.8
1972	39	40.8
1973	48	40.8
1974	35	40.8
1975	33	40.8
1976	57	40.8
1977	35	40.8
1978	43	40.8

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

First to last qualifying date each year at Mount Wilson (Nooroo)
Year	First date	Last date
1888	1888-02-09	1888-12-16
1889	1889-01-04	1889-12-20
1890	1890-01-05	1890-12-30
1891	1891-01-11	1891-12-22
1892	1892-01-12	1892-12-31
1893	1893-01-07	1893-12-15
1894	1894-01-06	1894-12-29
1895	1895-01-01	1895-12-30
1896	1896-01-20	1896-12-15
1897	1897-01-03	1897-12-19
1898	1898-01-13	1898-12-25
1899	1899-01-18	1899-11-16
1900	1900-01-06	1900-12-03
1901	1901-01-11	1901-11-13
1902	1902-03-15	1902-12-19
1903	1903-01-05	1903-12-24
1904	1904-01-03	1904-11-17
1905	1905-02-15	1905-12-08
1906	1906-01-01	1906-12-25
1907	1907-01-02	1907-12-18
1908	1908-01-08	1908-12-22
1909	1909-01-17	1909-12-25
1910	1910-01-12	1910-11-30
1925	1925-01-16	1925-12-31
1926	1926-01-05	1926-12-31
1927	1927-01-06	1927-12-20
1928	1928-01-05	1928-12-16
1929	1929-02-06	1929-12-27
1930	1930-01-01	1930-12-18
1931	1931-01-03	1931-12-23
1933	1933-01-03	1933-12-12
1934	1934-01-07	1934-12-29
1935	1935-01-04	1935-12-04
1936	1936-01-05	1936-12-28
1937	1937-01-02	1937-12-29
1938	1938-01-17	1938-12-30
1939	1939-01-18	1939-11-27
1940	1940-01-01	1940-12-21
1941	1941-01-01	1941-11-20
1942	1942-02-02	1942-12-31
1943	1943-01-01	1943-12-28
1944	1944-01-12	1944-09-30
1945	1945-01-11	1945-12-19
1946	1946-01-19	1946-12-28
1947	1947-01-04	1947-12-25
1948	1948-01-13	1948-12-31
1949	1949-01-09	1949-12-20
1950	1950-01-01	1950-12-02
1951	1951-01-01	1951-11-27
1952	1952-02-25	1952-12-31
1953	1953-01-06	1953-11-27
1954	1954-01-01	1954-12-30
1955	1955-01-22	1955-12-20
1956	1956-01-11	1956-12-23
1957	1957-01-07	1957-12-31
1958	1958-01-29	1958-12-26
1959	1959-01-01	1959-12-26
1960	1960-01-05	1960-12-19
1961	1961-01-02	1961-12-27
1962	1962-01-01	1962-12-27
1963	1963-01-04	1963-12-30
1964	1964-01-25	1964-11-21
1965	1965-01-07	1965-12-06
1966	1966-01-17	1966-12-30
1967	1967-01-25	1967-12-30
1968	1968-01-05	1968-12-25
1969	1969-01-02	1969-12-12
1970	1970-01-08	1970-12-30
1971	1971-01-14	1971-12-28
1972	1972-01-06	1972-12-27
1973	1973-01-27	1973-12-28
1974	1974-01-08	1974-11-27
1975	1975-01-18	1975-12-30
1976	1976-01-07	1976-12-25
1977	1977-01-02	1977-12-26
1978	1978-01-03	1978-12-29

Every Fixed Threshold

Fixed thresholds at Mount Wilson (Nooroo)
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	76	71	1950	43
25 mm (0.98 in): Days with 25 mm or more rain	76	30	1950	18
50 mm (1.97 in): Days with 50 mm or more rain	71	10	1963	10
100 mm (3.94 in): Days with 100 mm or more rain	40	4	1942	3
200 mm (7.87 in): Days with 200 mm or more rain	2	1	1889	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1888.

Download the Data

Data for Mount Wilson (Nooroo) 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).

Mount Wilson (Nooroo) Threshold Days by Year (ASN00063057)

Key Facts for Mount Wilson (Nooroo) Thresholds

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

Every Fixed Threshold

Download the Data

Related