Sullivan Threshold Days by Year (USC00238171)

6 fixed thresholds counted per year at Sullivan (USC00238171): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Sullivan Thresholds

Sullivan: days with 10 mm (0.39 in) or more of precipitation in 65 years, most in 1998 with 49.
Sullivan: days with 25 mm (0.98 in) or more of precipitation in 65 years, most in 1938 with 20.
Sullivan: days with 50 mm (1.97 in) or more of precipitation in 56 years, most in 1950 with 6.
Sullivan: days with 10 cm (3.9 in) or more of snowfall in 25 years, most in 1960 with 4.
6 fixed thresholds have at least one qualifying day at Sullivan.

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

65 years with a qualifying day

Days per year at Sullivan with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 49 in 1998.

Days with 10 mm (0.39 in) or more of precipitation per year at Sullivan
Year	Days	Decade average
1936	18	32.8
1937	31	32.8
1938	46	32.8
1939	36	32.8
1940	35	36
1941	38	36
1942	46	36
1943	34	36
1944	25	36
1945	38	36
1946	33	36
1947	33	36
1948	32	36
1949	46	36
1950	39	32.3
1951	43	32.3
1952	27	32.3
1953	21	32.3
1954	32	32.3
1955	23	32.3
1956	30	32.3
1957	44	32.3
1958	32	32.3
1959	32	32.3
1960	31	32.9
1961	40	32.9
1962	29	32.9
1963	24	32.9
1964	34	32.9
1965	29	32.9
1966	25	32.9
1967	42	32.9
1968	34	32.9
1969	41	32.9
1970	34	34.6
1971	31	34.6
1972	34	34.6
1973	41	34.6
1974	37	34.6
1977	39	34.6
1978	38	34.6
1979	23	34.6
1980	25	34
1981	45	34
1987	32	34
1992	31	32.9
1994	30	32.9
1995	31	32.9
1996	30	32.9
1997	29	32.9
1998	49	32.9
1999	30	32.9
2000	30	34.9
2001	41	34.9
2002	34	34.9
2003	35	34.9
2004	43	34.9
2005	33	34.9
2006	29	34.9
2007	26	34.9
2008	39	34.9
2009	39	34.9
2012	24	32.3
2013	40	32.3
2014	33	32.3

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

First to last qualifying date each year at Sullivan
Year	First date	Last date
1936	1936-02-04	1936-12-27
1937	1937-01-07	1937-12-17
1938	1938-01-21	1938-12-23
1939	1939-01-30	1939-12-27
1940	1940-01-07	1940-12-16
1941	1941-01-26	1941-12-26
1942	1942-01-31	1942-12-29
1943	1943-02-03	1943-11-07
1944	1944-02-14	1944-09-29
1945	1945-02-17	1945-11-21
1946	1946-01-09	1946-12-29
1947	1947-01-02	1947-11-15
1948	1948-01-01	1948-11-02
1949	1949-01-04	1949-12-26
1950	1950-01-02	1950-11-20
1951	1951-01-14	1951-12-14
1952	1952-01-15	1952-12-20
1953	1953-01-02	1953-11-20
1954	1954-01-20	1954-12-29
1955	1955-02-05	1955-11-16
1956	1956-01-30	1956-12-20
1957	1957-01-22	1957-12-31
1958	1958-01-21	1958-12-05
1959	1959-01-21	1959-12-28
1960	1960-01-13	1960-12-11
1961	1961-02-03	1961-12-17
1962	1962-01-05	1962-12-21
1963	1963-03-05	1963-11-23
1964	1964-01-13	1964-11-27
1965	1965-01-02	1965-12-31
1966	1966-01-01	1966-12-08
1967	1967-01-26	1967-12-21
1968	1968-01-28	1968-12-30
1969	1969-01-18	1969-12-07
1970	1970-02-23	1970-12-21
1971	1971-01-31	1971-12-30
1972	1972-03-13	1972-12-30
1973	1973-01-04	1973-12-30
1974	1974-01-10	1974-12-31
1977	1977-02-12	1977-12-14
1978	1978-01-16	1978-12-30
1979	1979-01-01	1979-12-24
1980	1980-03-12	1980-12-08
1981	1981-02-01	1981-12-23
1987	1987-01-10	1987-12-28
1992	1992-02-12	1992-12-16
1994	1994-01-17	1994-12-16
1995	1995-01-13	1995-12-19
1996	1996-01-02	1996-12-01
1997	1997-01-08	1997-12-24
1998	1998-01-05	1998-12-31
1999	1999-01-02	1999-12-10
2000	2000-01-09	2000-12-30
2001	2001-01-29	2001-12-16
2002	2002-01-29	2002-12-18
2003	2003-01-01	2003-12-22
2004	2004-01-03	2004-12-06
2005	2005-01-02	2005-12-28
2006	2006-01-24	2006-12-31
2007	2007-01-13	2007-12-28
2008	2008-01-08	2008-12-28
2009	2009-01-28	2009-12-25
2012	2012-01-17	2012-11-12
2013	2013-01-13	2013-12-22
2014	2014-01-06	2014-12-15

Every Fixed Threshold

Fixed thresholds at Sullivan
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	65	49	1998	33
25 mm (0.98 in): Days with 25 mm or more rain	65	20	1938	10
50 mm (1.97 in): Days with 50 mm or more rain	56	6	1950	2
100 mm (3.94 in): Days with 100 mm or more rain	12	1	1938	1
10 cm (3.9 in): Days with 10 cm or more snowfall	25	4	1960	1
25 cm (9.8 in): Days with 25 cm or more snowfall	2	1	1968	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1936.

Download the Data

Data for Sullivan 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).

Sullivan Threshold Days by Year (USC00238171)

Key Facts for Sullivan Thresholds

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

Every Fixed Threshold

Download the Data

Related