Helidon Post Office Threshold Days by Year (ASN00040096)

4 fixed thresholds counted per year at Helidon Post Office (ASN00040096): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Helidon Post Office Thresholds

Helidon Post Office: days with 10 mm (0.39 in) or more of precipitation in 121 years, most in 1917 with 38.
Helidon Post Office: days with 25 mm (0.98 in) or more of precipitation in 121 years, most in 1954 with 17.
Helidon Post Office: days with 50 mm (1.97 in) or more of precipitation in 99 years, most in 1959 with 6.
Helidon Post Office: days with 100 mm (3.94 in) or more of precipitation in 27 years, most in 1996 with 4.
4 fixed thresholds have at least one qualifying day at Helidon Post Office.

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

121 years with a qualifying day

Days per year at Helidon Post Office with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 38 in 1917.

Days with 10 mm (0.39 in) or more of precipitation per year at Helidon Post Office
Year	Days	Decade average
1894	19	22.7
1895	24	22.7
1896	22	22.7
1897	24	22.7
1898	23	22.7
1899	24	22.7
1900	18	22.4
1901	27	22.4
1904	22	22.4
1905	16	22.4
1906	27	22.4
1907	25	22.4
1908	20	22.4
1909	24	22.4
1910	26	23.8
1911	24	23.8
1912	28	23.8
1913	21	23.8
1914	31	23.8
1915	16	23.8
1916	31	23.8
1917	38	23.8
1918	11	23.8
1919	12	23.8
1920	21	21.6
1921	27	21.6
1922	16	21.6
1923	12	21.6
1924	22	21.6
1925	27	21.6
1926	22	21.6
1927	26	21.6
1928	25	21.6
1929	18	21.6
1930	22	21.9
1931	26	21.9
1932	18	21.9
1933	27	21.9
1934	28	21.9
1935	20	21.9
1936	15	21.9
1937	21	21.9
1938	22	21.9
1939	20	21.9
1940	20	22.4
1941	15	22.4
1942	21	22.4
1943	32	22.4
1944	17	22.4
1945	27	22.4
1946	19	22.4
1947	28	22.4
1948	20	22.4
1949	25	22.4
1950	35	25.8
1951	17	25.8
1952	21	25.8
1953	22	25.8
1954	31	25.8
1955	27	25.8
1956	31	25.8
1957	16	25.8
1958	25	25.8
1959	33	25.8
1960	18	24.3
1961	26	24.3
1962	24	24.3
1963	28	24.3
1964	28	24.3
1965	19	24.3
1966	27	24.3
1967	30	24.3
1968	25	24.3
1969	18	24.3
1970	24	26.3
1971	29	26.3
1972	22	26.3
1973	24	26.3
1974	32	26.3
1975	26	26.3
1976	29	26.3
1977	18	26.3
1978	33	26.3
1980	14	21.2
1984	21	21.2
1985	22	21.2
1986	21	21.2
1987	22	21.2
1989	27	21.2
1990	21	22.1
1991	20	22.1
1992	25	22.1
1993	13	22.1
1994	6	22.1
1995	32	22.1
1996	31	22.1
1997	19	22.1
1998	28	22.1
1999	26	22.1
2000	10	19.2
2001	23	19.2
2002	18	19.2
2003	21	19.2
2004	21	19.2
2005	12	19.2
2006	19	19.2
2007	17	19.2
2008	28	19.2
2009	23	19.2
2010	38	22.3
2011	29	22.3
2012	24	22.3
2013	31	22.3
2014	23	22.3
2015	18	22.3
2016	17	22.3
2017	14	22.3
2019	7	22.3
2020	11	11
2023	9	11
2025	13	11

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

First to last qualifying date each year at Helidon Post Office
Year	First date	Last date
1894	1894-01-06	1894-12-17
1895	1895-01-01	1895-12-29
1896	1896-02-09	1896-12-19
1897	1897-01-04	1897-12-29
1898	1898-01-03	1898-12-24
1899	1899-01-11	1899-12-31
1900	1900-01-08	1900-11-17
1901	1901-01-14	1901-12-16
1904	1904-01-21	1904-12-22
1905	1905-01-15	1905-12-24
1906	1906-01-02	1906-12-25
1907	1907-01-12	1907-12-20
1908	1908-02-10	1908-12-27
1909	1909-01-17	1909-12-29
1910	1910-01-10	1910-12-19
1911	1911-01-11	1911-12-30
1912	1912-01-06	1912-12-21
1913	1913-01-01	1913-12-19
1914	1914-01-09	1914-12-31
1915	1915-01-02	1915-12-20
1916	1916-01-12	1916-12-14
1917	1917-01-05	1917-12-26
1918	1918-01-02	1918-12-19
1919	1919-01-18	1919-12-31
1920	1920-01-02	1920-12-09
1921	1921-01-17	1921-12-31
1922	1922-01-01	1922-12-16
1923	1923-01-04	1923-12-27
1924	1924-01-07	1924-12-17
1925	1925-01-05	1925-12-31
1926	1926-01-04	1926-12-31
1927	1927-01-10	1927-12-28
1928	1928-01-11	1928-12-31
1929	1929-01-20	1929-12-31
1930	1930-01-13	1930-12-22
1931	1931-01-10	1931-12-12
1932	1932-01-13	1932-12-21
1933	1933-01-15	1933-12-27
1934	1934-01-04	1934-12-30
1935	1935-01-06	1935-12-27
1936	1936-01-10	1936-12-24
1937	1937-02-25	1937-12-20
1938	1938-01-19	1938-11-30
1939	1939-01-23	1939-12-27
1940	1940-01-17	1940-12-31
1941	1941-01-10	1941-12-30
1942	1942-01-14	1942-12-31
1943	1943-01-04	1943-12-31
1944	1944-01-06	1944-12-27
1945	1945-01-01	1945-12-20
1946	1946-01-06	1946-12-03
1947	1947-01-24	1947-12-25
1948	1948-02-28	1948-12-31
1949	1949-01-10	1949-12-17
1950	1950-01-18	1950-12-20
1951	1951-01-08	1951-12-19
1952	1952-01-09	1952-11-28
1953	1953-01-08	1953-12-28
1954	1954-01-03	1954-12-17
1955	1955-01-08	1955-12-31
1956	1956-01-13	1956-12-22
1957	1957-01-09	1957-12-17
1958	1958-01-02	1958-12-29
1959	1959-01-03	1959-12-22
1960	1960-01-22	1960-12-13
1961	1961-01-04	1961-12-20
1962	1962-01-02	1962-12-31
1963	1963-01-01	1963-12-14
1964	1964-02-09	1964-12-27
1965	1965-01-24	1965-12-15
1966	1966-01-24	1966-12-31
1967	1967-01-01	1967-11-26
1968	1968-01-04	1968-12-05
1969	1969-01-02	1969-12-24
1970	1970-01-02	1970-12-27
1971	1971-01-19	1971-12-28
1972	1972-01-15	1972-12-29
1973	1973-01-13	1973-12-26
1974	1974-01-08	1974-12-29
1975	1975-01-05	1975-12-24
1976	1976-01-10	1976-12-31
1977	1977-01-17	1977-12-12
1978	1978-01-06	1978-12-29
1980	1980-01-10	1980-12-31
1984	1984-01-05	1984-12-30
1985	1985-01-08	1985-12-14
1986	1986-01-10	1986-12-27
1987	1987-01-06	1987-12-11
1989	1989-01-06	1989-12-25
1990	1990-01-14	1990-12-04
1991	1991-01-07	1991-12-31
1992	1992-01-01	1992-12-09
1993	1993-01-06	1993-12-09
1994	1994-01-20	1994-06-08
1995	1995-01-03	1995-12-24
1996	1996-01-03	1996-12-31
1997	1997-01-27	1997-12-15
1998	1998-01-30	1998-12-25
1999	1999-01-01	1999-12-27
2000	2000-01-05	2000-12-29
2001	2001-02-01	2001-12-16
2002	2002-01-01	2002-12-27
2003	2003-02-05	2003-12-15
2004	2004-01-15	2004-12-26
2005	2005-01-07	2005-12-28
2006	2006-01-05	2006-12-27
2007	2007-01-04	2007-12-27
2008	2008-01-07	2008-12-25
2009	2009-01-02	2009-12-30
2010	2010-01-04	2010-12-28
2011	2011-01-06	2011-12-11
2012	2012-01-25	2012-12-26
2013	2013-01-11	2013-12-17
2014	2014-01-07	2014-12-30
2015	2015-01-04	2015-11-29
2016	2016-01-05	2016-12-09
2017	2017-01-03	2017-12-22
2019	2019-03-15	2019-12-12
2020	2020-02-06	2020-12-31
2023	2023-01-24	2023-12-02
2025	2025-01-07	2025-12-27

Every Fixed Threshold

Fixed thresholds at Helidon 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	121	38	1917	13
25 mm (0.98 in): Days with 25 mm or more rain	121	17	1954	6
50 mm (1.97 in): Days with 50 mm or more rain	99	6	1959	1
100 mm (3.94 in): Days with 100 mm or more rain	27	4	1996	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1894.

Download the Data

Data for Helidon 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 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

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

Helidon Post Office Threshold Days by Year (ASN00040096)

Key Facts for Helidon Post Office Thresholds

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

Every Fixed Threshold

Download the Data

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