Atherton Post Office Threshold Days by Year

5 fixed thresholds counted per year at Atherton Post Office (ASN00031002): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Atherton Post Office Thresholds

Atherton Post Office: days with 10 mm (0.39 in) or more of precipitation in 68 years, most in 1956 with 58.
Atherton Post Office: days with 25 mm (0.98 in) or more of precipitation in 68 years, most in 1956 with 27.
Atherton Post Office: days with 50 mm (1.97 in) or more of precipitation in 67 years, most in 1939 with 13.
Atherton Post Office: days with 100 mm (3.94 in) or more of precipitation in 40 years, most in 1911 with 6.
5 fixed thresholds have at least one qualifying day at Atherton Post Office.

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

68 years with a qualifying day

Days per year at Atherton Post Office with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 58 in 1956.

Days with 10 mm (0.39 in) or more of precipitation per year at Atherton Post Office
Year	Days	Decade average
1895	36	36.3
1897	25	36.3
1898	48	36.3
1905	31	31.6
1906	29	31.6
1907	36	31.6
1908	29	31.6
1909	33	31.6
1910	50	32.7
1911	34	32.7
1912	25	32.7
1913	43	32.7
1914	33	32.7
1915	13	32.7
1916	31	32.7
1917	48	32.7
1918	34	32.7
1919	16	32.7
1920	27	32.9
1921	35	32.9
1922	34	32.9
1923	23	32.9
1924	37	32.9
1925	38	32.9
1926	25	32.9
1927	31	32.9
1928	35	32.9
1929	44	32.9
1930	32	34.4
1931	29	34.4
1932	30	34.4
1933	54	34.4
1934	42	34.4
1935	22	34.4
1936	42	34.4
1937	31	34.4
1938	22	34.4
1939	40	34.4
1940	38	33.6
1941	39	33.6
1942	29	33.6
1943	28	33.6
1944	34	33.6
1945	36	33.6
1946	27	33.6
1947	38	33.6
1948	32	33.6
1949	35	33.6
1950	38	38.2
1951	25	38.2
1952	36	38.2
1953	42	38.2
1954	32	38.2
1955	47	38.2
1956	58	38.2
1957	32	38.2
1958	34	38.2
1960	20	26.8
1961	19	26.8
1962	30	26.8
1963	40	26.8
1964	40	26.8
1965	23	26.8
1966	21	26.8
1967	27	26.8
1968	25	26.8
1969	23	26.8
1970	24	24

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

First to last qualifying date each year at Atherton Post Office
Year	First date	Last date
1895	1895-01-05	1895-12-29
1897	1897-01-13	1897-12-30
1898	1898-01-01	1898-12-18
1905	1905-01-04	1905-12-11
1906	1906-01-11	1906-12-11
1907	1907-01-04	1907-12-31
1908	1908-01-01	1908-12-14
1909	1909-01-04	1909-12-21
1910	1910-01-11	1910-12-31
1911	1911-01-01	1911-12-27
1912	1912-01-06	1912-12-31
1913	1913-01-07	1913-12-31
1914	1914-01-01	1914-12-27
1915	1915-01-04	1915-12-22
1916	1916-01-22	1916-12-31
1917	1917-01-01	1917-12-27
1918	1918-01-03	1918-12-28
1919	1919-01-18	1919-12-31
1920	1920-01-02	1920-12-21
1921	1921-01-03	1921-12-31
1922	1922-01-01	1922-12-26
1923	1923-01-08	1923-12-28
1924	1924-01-04	1924-12-18
1925	1925-01-06	1925-12-31
1926	1926-01-04	1926-12-30
1927	1927-01-13	1927-12-27
1928	1928-01-20	1928-12-27
1929	1929-01-02	1929-12-31
1930	1930-01-01	1930-12-29
1931	1931-01-21	1931-12-29
1932	1932-01-01	1932-12-28
1933	1933-01-05	1933-12-31
1934	1934-01-01	1934-12-03
1935	1935-01-02	1935-12-09
1936	1936-01-02	1936-12-27
1937	1937-01-15	1937-12-30
1938	1938-01-06	1938-12-05
1939	1939-01-11	1939-12-26
1940	1940-01-08	1940-12-23
1941	1941-01-04	1941-12-31
1942	1942-01-22	1942-12-29
1943	1943-01-04	1943-12-28
1944	1944-01-06	1944-12-25
1945	1945-01-03	1945-12-26
1946	1946-01-09	1946-12-10
1947	1947-01-01	1947-12-29
1948	1948-01-03	1948-12-31
1949	1949-01-01	1949-12-22
1950	1950-01-12	1950-12-30
1951	1951-01-03	1951-12-27
1952	1952-01-11	1952-12-24
1953	1953-01-12	1953-12-30
1954	1954-01-04	1954-12-17
1955	1955-01-10	1955-12-31
1956	1956-01-02	1956-12-30
1957	1957-01-01	1957-12-14
1958	1958-01-01	1958-12-23
1960	1960-01-15	1960-12-28
1961	1961-01-02	1961-12-28
1962	1962-01-06	1962-12-28
1963	1963-01-07	1963-12-19
1964	1964-01-02	1964-12-14
1965	1965-01-16	1965-12-14
1966	1966-01-05	1966-12-10
1967	1967-01-03	1967-12-27
1968	1968-01-04	1968-12-23
1969	1969-01-06	1969-12-24
1970	1970-01-20	1970-12-31

Every Fixed Threshold

Fixed thresholds at Atherton Post Office
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	68	58	1956	24
25 mm (0.98 in): Days with 25 mm or more rain	68	27	1956	7
50 mm (1.97 in): Days with 50 mm or more rain	67	13	1939	2
100 mm (3.94 in): Days with 100 mm or more rain	40	6	1911	1
200 mm (7.87 in): Days with 200 mm or more rain	8	2	1911	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1895.

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Data for Atherton Post Office 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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Atherton Post Office Threshold Days by Year

Key Facts for Atherton Post Office Thresholds

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

Every Fixed Threshold

Download the Data

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