Alva 1W Threshold Days by Year (USC00340193)

20 fixed thresholds counted per year at Alva 1W (USC00340193): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Alva 1W Thresholds

Alva 1W: days with 10 mm (0.39 in) or more of precipitation in 106 years, most in 1915 with 42.
Alva 1W: days with 25 mm (0.98 in) or more of precipitation in 106 years, most in 2004 with 18.
Alva 1W: days with a maximum temperature at or above 30 C (86 F) in 89 years, most in 1956 with 151.
Alva 1W: days with a maximum temperature at or above 35 C (95 F) in 89 years, most in 1954 with 98.
20 fixed thresholds have at least one qualifying day at Alva 1W.

Days at or above 30 C (86 F)

89 years with a qualifying day

Days per year at Alva 1W with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 151 in 1956.

Days at or above 30 C (86 F) per year at Alva 1W
Year	Days	Decade average
1896	111	111
1906	82	98.5
1907	115	98.5
1912	85	99.8
1913	113	99.8
1914	112	99.8
1915	63	99.8
1916	109	99.8
1917	92	99.8
1918	119	99.8
1919	105	99.8
1920	98	110.7
1921	119	110.7
1922	110	110.7
1923	92	110.7
1924	90	110.7
1925	121	110.7
1926	121	110.7
1927	116	110.7
1928	127	110.7
1929	113	110.7
1930	127	129.3
1931	126	129.3
1932	113	129.3
1933	127	129.3
1934	134	129.3
1935	116	129.3
1936	130	129.3
1937	128	129.3
1938	144	129.3
1939	148	129.3
1940	128	123.9
1941	115	123.9
1942	118	123.9
1943	139	123.9
1944	121	123.9
1945	121	123.9
1946	122	123.9
1947	132	123.9
1948	130	123.9
1949	113	123.9
1950	122	122.1
1953	132	122.1
1954	136	122.1
1955	122	122.1
1956	151	122.1
1957	86	122.1
1958	113	122.1
1959	115	122.1
1960	100	108.2
1961	91	108.2
1962	125	108.2
1963	138	108.2
1964	113	108.2
1965	100	108.2
1966	104	108.2
1967	101	108.2
1968	108	108.2
1969	102	108.2
1970	120	112.4
1971	123	112.4
1972	121	112.4
1973	104	112.4
1974	84	112.4
1975	110	112.4
1976	99	112.4
1977	124	112.4
1978	121	112.4
1979	118	112.4
1980	126	116
1989	106	116
1990	113	114.3
1991	136	114.3
1992	101	114.3
1993	104	114.3
1994	134	114.3
1995	101	114.3
1996	114	114.3
1997	112	114.3
1998	132	114.3
1999	96	114.3
2001	114	108
2002	109	108
2003	103	108
2004	96	108
2005	115	108
2006	115	108
2007	97	108
2008	115	108

For each year, a bar from the first to the last day at Alva 1W meeting 30 C (86 F).

First to last qualifying date each year at Alva 1W
Year	First date	Last date
1896	1896-04-10	1896-10-02
1906	1906-04-10	1906-10-07
1907	1907-03-19	1907-10-06
1912	1912-04-30	1912-10-10
1913	1913-03-30	1913-10-07
1914	1914-03-16	1914-10-07
1915	1915-04-28	1915-09-19
1916	1916-03-06	1916-10-09
1917	1917-03-23	1917-11-06
1918	1918-02-24	1918-10-15
1919	1919-05-03	1919-10-03
1920	1920-04-15	1920-10-12
1921	1921-04-23	1921-10-24
1922	1922-06-09	1922-10-28
1923	1923-05-10	1923-09-29
1924	1924-04-15	1924-10-29
1925	1925-04-07	1925-10-04
1926	1926-04-16	1926-10-17
1927	1927-04-09	1927-10-27
1928	1928-03-23	1928-10-14
1929	1929-03-23	1929-10-17
1930	1930-02-23	1930-10-10
1931	1931-04-07	1931-10-24
1932	1932-04-01	1932-10-18
1933	1933-04-08	1933-10-10
1934	1934-03-20	1934-11-07
1935	1935-02-21	1935-10-20
1936	1936-04-12	1936-10-19
1937	1937-04-14	1937-10-30
1938	1938-03-21	1938-10-31
1939	1939-04-09	1939-10-27
1940	1940-03-30	1940-10-25
1941	1941-04-17	1941-10-13
1942	1942-04-04	1942-11-18
1943	1943-03-28	1943-10-29
1944	1944-04-09	1944-11-02
1945	1945-03-13	1945-11-06
1946	1946-03-31	1946-10-28
1947	1947-04-30	1947-10-21
1948	1948-04-05	1948-10-20
1949	1949-04-08	1949-11-11
1950	1950-04-01	1950-11-06
1953	1953-03-20	1953-10-17
1954	1954-02-14	1954-10-17
1955	1955-03-10	1955-10-27
1956	1956-02-24	1956-10-12
1957	1957-05-29	1957-10-05
1958	1958-04-23	1958-10-23
1959	1959-03-24	1959-10-25
1960	1960-04-06	1960-10-10
1961	1961-04-19	1961-10-22
1962	1962-02-11	1962-10-14
1963	1963-03-24	1963-10-18
1964	1964-04-12	1964-10-16
1965	1965-04-07	1965-10-10
1966	1966-03-31	1966-10-13
1967	1967-03-11	1967-10-06
1968	1968-03-29	1968-10-30
1969	1969-05-19	1969-10-03
1970	1970-04-27	1970-10-06
1971	1971-03-13	1971-10-12
1972	1972-03-22	1972-10-12
1973	1973-05-18	1973-10-23
1974	1974-03-31	1974-09-11
1975	1975-04-16	1975-10-21
1976	1976-03-25	1976-10-11
1977	1977-03-14	1977-10-26
1978	1978-03-18	1978-10-22
1979	1979-05-08	1979-10-26
1980	1980-04-20	1980-11-08
1989	1989-03-10	1989-10-15
1990	1990-04-22	1990-11-01
1991	1991-03-05	1991-10-23
1992	1992-04-09	1992-10-23
1993	1993-04-23	1993-10-07
1994	1994-03-17	1994-10-06
1995	1995-03-21	1995-10-22
1996	1996-02-22	1996-10-16
1997	1997-03-20	1997-10-07
1998	1998-04-15	1998-10-15
1999	1999-04-21	1999-10-22
2001	2001-04-21	2001-10-24
2002	2002-04-02	2002-10-01
2003	2003-04-03	2003-10-24
2004	2004-04-16	2004-10-22
2005	2005-04-21	2005-11-04
2006	2006-04-11	2006-11-09
2007	2007-06-06	2007-10-13
2008	2008-05-18	2008-10-08

Every Fixed Threshold

Fixed thresholds at Alva 1W
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	89	151	1956	115
35 C (95 F): Days	89	98	1954	48
40 C (104 F): Days	84	51	1936	2
45 C (113 F): Days	13	12	1936	1
90 F (32.2 C): Days	89	133	1956	92
100 F (37.8 C): Days	87	70	1936	15
110 F (43.3 C): Days	30	23	1936	2
120 F (48.9 C): Days	1	1	1936	1
0 C (32 F): Ice days (max	89	29	1913	3
0 C (32 F): Frost days (min	87	135	1917	119
-10 C (14 F): Days with min	86	36	1918	9
-20 C (-4 F): Days with min	27	8	1912	1
20 C (68 F): Tropical nights (min	87	85	1980	55
25 C (77 F): Days with min	80	22	1936	7
10 mm (0.39 in): Days with 10 mm or more rain	106	42	1915	29
25 mm (0.98 in): Days with 25 mm or more rain	106	18	2004	13
50 mm (1.97 in): Days with 50 mm or more rain	87	8	2018	4
100 mm (3.94 in): Days with 100 mm or more rain	10	1	1916	1
10 cm (3.9 in): Days with 10 cm or more snowfall	46	5	1941	1
25 cm (9.8 in): Days with 25 cm or more snowfall	4	1	1938	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1896.

Download the Data

Data for Alva 1W 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).

Alva 1W Threshold Days by Year (USC00340193)

Key Facts for Alva 1W Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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