Blair Threshold Days by Year (USC00250930)

20 fixed thresholds counted per year at Blair (USC00250930): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Blair Thresholds

Blair: days with 10 mm (0.39 in) or more of precipitation in 104 years, most in 1909 with 40.
Blair: days with 25 mm (0.98 in) or more of precipitation in 104 years, most in 1909 with 14.
Blair: nights with a minimum temperature at or below 0 C (32 F) in 102 years, most in 1916 with 172.
Blair: nights with a minimum temperature at or below -10 C (14 F) in 102 years, most in 1978 with 78.
20 fixed thresholds have at least one qualifying day at Blair.

Days at or above 30 C (86 F)

101 years with a qualifying day

Days per year at Blair with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 106 in 1939.

Days at or above 30 C (86 F) per year at Blair
Year	Days	Decade average
1898	52	50.5
1899	49	50.5
1900	69	48.8
1901	77	48.8
1902	28	48.8
1903	31	48.8
1904	31	48.8
1905	36	48.8
1906	43	48.8
1907	50	48.8
1908	64	48.8
1909	59	48.8
1910	64	68.6
1911	89	68.6
1912	63	68.6
1913	89	68.6
1914	72	68.6
1915	26	68.6
1916	69	68.6
1917	51	68.6
1918	86	68.6
1919	77	68.6
1920	65	55.9
1921	79	55.9
1922	60	55.9
1923	37	55.9
1924	39	55.9
1925	64	55.9
1926	63	55.9
1927	57	55.9
1928	53	55.9
1929	42	55.9
1930	63	81.7
1931	77	81.7
1932	54	81.7
1933	75	81.7
1934	97	81.7
1935	66	81.7
1936	104	81.7
1937	86	81.7
1938	89	81.7
1939	106	81.7
1940	64	60.8
1941	72	60.8
1942	62	60.8
1943	76	60.8
1946	48	60.8
1947	60	60.8
1948	58	60.8
1949	46	60.8
1950	16	45
1951	24	45
1952	51	45
1953	57	45
1954	53	45
1955	73	45
1956	61	45
1957	44	45
1958	26	45
1959	45	45
1960	33	47
1961	41	47
1962	37	47
1963	57	47
1964	61	47
1965	40	47
1966	56	47
1967	45	47
1968	54	47
1969	46	47
1970	77	57.5
1971	64	57.5
1972	52	57.5
1973	54	57.5
1974	47	57.5
1975	62	57.5
1976	66	57.5
1977	43	57.5
1978	58	57.5
1979	52	57.5
1980	70	49.5
1981	40	49.5
1982	28	49.5
1983	68	49.5
1984	49	49.5
1985	28	49.5
1986	41	49.5
1987	58	49.5
1988	68	49.5
1989	45	49.5
1990	56	49
1991	61	49
1993	40	49
1994	51	49
1995	61	49
1996	27	49
1997	51	49
1998	51	49
1999	43	49
2000	51	52.5
2001	54	52.5

For each year, a bar from the first to the last day at Blair meeting 30 C (86 F).

First to last qualifying date each year at Blair
Year	First date	Last date
1898	1898-04-17	1898-09-30
1899	1899-05-12	1899-10-23
1900	1900-05-12	1900-10-06
1901	1901-04-27	1901-09-25
1902	1902-04-21	1902-09-08
1903	1903-06-19	1903-09-25
1904	1904-05-22	1904-10-04
1905	1905-06-03	1905-08-31
1906	1906-04-24	1906-09-15
1907	1907-03-21	1907-09-23
1908	1908-04-13	1908-09-23
1909	1909-05-04	1909-10-06
1910	1910-03-22	1910-09-30
1911	1911-05-09	1911-09-28
1912	1912-05-02	1912-10-05
1913	1913-04-30	1913-10-06
1914	1914-05-10	1914-09-18
1915	1915-05-10	1915-09-13
1916	1916-04-11	1916-10-07
1917	1917-05-16	1917-09-16
1918	1918-05-02	1918-10-15
1919	1919-05-28	1919-10-02
1920	1920-05-22	1920-10-10
1921	1921-04-03	1921-10-16
1922	1922-05-05	1922-10-27
1923	1923-05-27	1923-09-05
1924	1924-04-14	1924-08-30
1925	1925-04-22	1925-09-19
1926	1926-04-29	1926-09-17
1927	1927-04-26	1927-10-28
1928	1928-03-23	1928-10-11
1929	1929-04-04	1929-09-23
1930	1930-04-10	1930-10-10
1931	1931-04-08	1931-10-10
1932	1932-05-03	1932-10-02
1933	1933-05-18	1933-09-25
1934	1934-04-29	1934-10-12
1935	1935-06-12	1935-09-24
1936	1936-04-13	1936-09-22
1937	1937-05-20	1937-10-29
1938	1938-04-30	1938-10-16
1939	1939-04-23	1939-10-06
1940	1940-04-14	1940-10-25
1941	1941-05-14	1941-09-21
1942	1942-04-29	1942-10-02
1943	1943-03-30	1943-10-10
1946	1946-03-31	1946-09-26
1947	1947-05-03	1947-10-21
1948	1948-04-18	1948-09-19
1949	1949-04-25	1949-09-20
1950	1950-04-23	1950-10-31
1951	1951-06-26	1951-10-02
1952	1952-05-03	1952-10-01
1953	1953-05-25	1953-10-03
1954	1954-04-15	1954-09-28
1955	1955-04-19	1955-09-19
1956	1956-04-02	1956-10-13
1957	1957-05-02	1957-09-02
1958	1958-04-19	1958-09-25
1959	1959-05-01	1959-09-09
1960	1960-04-23	1960-09-08
1961	1961-04-24	1961-10-18
1962	1962-05-08	1962-09-13
1963	1963-05-09	1963-10-16
1964	1964-04-17	1964-09-10
1965	1965-05-01	1965-08-27
1966	1966-05-05	1966-10-13
1967	1967-04-17	1967-09-26
1968	1968-03-31	1968-09-03
1969	1969-05-27	1969-10-05
1970	1970-04-29	1970-10-06
1971	1971-06-04	1971-10-02
1972	1972-04-07	1972-09-20
1973	1973-05-19	1973-09-05
1974	1974-04-28	1974-09-27
1975	1975-05-19	1975-10-23
1976	1976-05-21	1976-10-03
1977	1977-04-10	1977-09-09
1978	1978-05-19	1978-09-19
1979	1979-05-18	1979-09-11
1980	1980-04-21	1980-10-08
1981	1981-04-26	1981-09-30
1982	1982-06-06	1982-09-10
1983	1983-05-27	1983-09-27
1984	1984-06-07	1984-09-20
1985	1985-04-18	1985-09-07
1986	1986-03-28	1986-09-21
1987	1987-04-19	1987-09-26
1988	1988-05-12	1988-09-22
1989	1989-04-21	1989-08-31
1990	1990-04-22	1990-09-26
1991	1991-04-05	1991-09-29
1993	1993-05-13	1993-10-07
1994	1994-04-18	1994-10-01
1995	1995-06-07	1995-10-13
1996	1996-04-12	1996-09-05
1997	1997-05-17	1997-10-07
1998	1998-05-19	1998-09-30
1999	1999-05-28	1999-09-08
2000	2000-05-12	2000-10-02
2001	2001-04-27	2001-10-03

Every Fixed Threshold

Fixed thresholds at Blair
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	101	106	1939	54
35 C (95 F): Days	96	57	1936	7
40 C (104 F): Days	22	27	1936	1
45 C (113 F): Days	2	2	1936	2
90 F (32.2 C): Days	101	84	1934	28
100 F (37.8 C): Days	57	40	1936	2
110 F (43.3 C): Days	6	7	1936	1
0 C (32 F): Ice days (max	101	81	1978	45
0 C (32 F): Frost days (min	102	172	1916	125
-10 C (14 F): Days with min	102	78	1978	36
-20 C (-4 F): Days with min	100	32	1936	3
-30 C (-22 F): Days with min	16	5	1899	2
20 C (68 F): Tropical nights (min	102	55	1936	34
25 C (77 F): Days with min	41	17	1936	2
10 mm (0.39 in): Days with 10 mm or more rain	104	40	1909	29
25 mm (0.98 in): Days with 25 mm or more rain	104	14	1909	8
50 mm (1.97 in): Days with 50 mm or more rain	76	4	1982	4
100 mm (3.94 in): Days with 100 mm or more rain	10	1	1903	1
10 cm (3.9 in): Days with 10 cm or more snowfall	61	6	1961	1
25 cm (9.8 in): Days with 25 cm or more snowfall	13	1	1923	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1898.

Download the Data

Data for Blair 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).

Blair Threshold Days by Year (USC00250930)

Key Facts for Blair Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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