Dilley Threshold Days by Year (USC00412458)

17 fixed thresholds counted per year at Dilley (USC00412458): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Dilley Thresholds

Dilley: days with 10 mm (0.39 in) or more of precipitation in 91 years, most in 1976 with 32.
Dilley: days with 25 mm (0.98 in) or more of precipitation in 91 years, most in 1958 with 14.
Dilley: days with a maximum temperature at or above 30 C (86 F) in 85 years, most in 1933 with 228.
Dilley: days with a maximum temperature at or above 35 C (95 F) in 85 years, most in 1956 with 134.
17 fixed thresholds have at least one qualifying day at Dilley.

Days at or above 30 C (86 F)

85 years with a qualifying day

Days per year at Dilley with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 228 in 1933.

Days at or above 30 C (86 F) per year at Dilley
Year	Days	Decade average
1917	206	182
1918	184	182
1919	156	182
1920	185	179.2
1921	173	179.2
1922	166	179.2
1923	161	179.2
1925	191	179.2
1926	176	179.2
1927	206	179.2
1928	168	179.2
1929	187	179.2
1930	162	193.2
1931	174	193.2
1932	181	193.2
1933	228	193.2
1934	204	193.2
1935	184	193.2
1936	186	193.2
1937	207	193.2
1938	207	193.2
1939	199	193.2
1940	182	185.7
1941	184	185.7
1942	173	185.7
1943	193	185.7
1944	192	185.7
1945	190	185.7
1946	181	185.7
1947	189	185.7
1948	199	185.7
1949	174	185.7
1950	211	188.2
1951	196	188.2
1952	174	188.2
1953	190	188.2
1954	208	188.2
1955	214	188.2
1956	209	188.2
1957	160	188.2
1958	141	188.2
1959	179	188.2
1960	176	180.4
1961	187	180.4
1962	207	180.4
1963	223	180.4
1964	185	180.4
1965	166	180.4
1966	164	180.4
1967	183	180.4
1968	144	180.4
1969	169	180.4
1970	155	171.8
1971	180	171.8
1972	192	171.8
1973	155	171.8
1974	172	171.8
1975	189	171.8
1976	147	171.8
1977	171	171.8
1978	187	171.8
1979	170	171.8
1980	191	177.7
1981	168	177.7
1982	181	177.7
1983	172	177.7
1984	190	177.7
1985	171	177.7
1986	171	177.7
1992	155	174.3
1993	165	174.3
1994	177	174.3
1995	188	174.3
1996	198	174.3
1997	153	174.3
1998	173	174.3
1999	185	174.3
2000	192	172.1
2001	174	172.1
2002	144	172.1
2003	146	172.1
2004	155	172.1
2005	185	172.1
2006	221	172.1
2007	160	172.1

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

First to last qualifying date each year at Dilley
Year	First date	Last date
1917	1917-01-29	1917-12-03
1918	1918-01-24	1918-11-08
1919	1919-02-12	1919-11-04
1920	1920-02-23	1920-12-30
1921	1921-03-06	1921-12-02
1922	1922-01-03	1922-11-04
1923	1923-01-07	1923-10-13
1925	1925-02-22	1925-11-13
1926	1926-02-13	1926-10-29
1927	1927-02-16	1927-11-11
1928	1928-03-04	1928-10-27
1929	1929-03-06	1929-10-29
1930	1930-02-12	1930-11-17
1931	1931-03-23	1931-11-23
1932	1932-02-07	1932-11-10
1933	1933-03-08	1933-12-21
1934	1934-03-07	1934-11-09
1935	1935-01-16	1935-11-10
1936	1936-01-16	1936-11-02
1937	1937-01-21	1937-11-15
1938	1938-01-17	1938-11-17
1939	1939-02-09	1939-12-11
1940	1940-02-27	1940-10-31
1941	1941-03-31	1941-11-17
1942	1942-01-26	1942-11-25
1943	1943-01-16	1943-11-01
1944	1944-02-25	1944-11-12
1945	1945-02-14	1945-11-09
1946	1946-03-01	1946-12-28
1947	1947-01-27	1947-11-11
1948	1948-01-01	1948-11-05
1949	1949-01-04	1949-12-12
1950	1950-01-18	1950-12-30
1951	1951-02-26	1951-12-31
1952	1952-01-01	1952-11-18
1953	1953-02-11	1953-10-22
1954	1954-02-11	1954-12-05
1955	1955-02-28	1955-12-26
1956	1956-01-30	1956-12-07
1957	1957-01-10	1957-11-02
1958	1958-04-04	1958-10-10
1959	1959-01-21	1959-10-27
1960	1960-02-10	1960-11-03
1961	1961-03-06	1961-11-02
1962	1962-02-05	1962-11-12
1963	1963-01-11	1963-11-17
1964	1964-03-04	1964-11-28
1965	1965-01-26	1965-11-27
1966	1966-03-04	1966-12-08
1967	1967-03-04	1967-11-27
1968	1968-04-17	1968-11-27
1969	1969-01-09	1969-11-13
1970	1970-04-12	1970-12-11
1971	1971-01-04	1971-10-25
1972	1972-01-23	1972-12-24
1973	1973-03-16	1973-12-31
1974	1974-02-21	1974-11-02
1975	1975-01-26	1975-11-30
1976	1976-02-18	1976-10-05
1977	1977-02-25	1977-12-09
1978	1978-03-01	1978-11-12
1979	1979-03-09	1979-11-10
1980	1980-02-21	1980-11-10
1981	1981-03-29	1981-11-26
1982	1982-01-23	1982-11-23
1983	1983-03-02	1983-12-05
1984	1984-02-15	1984-11-02
1985	1985-03-04	1985-11-12
1986	1986-02-18	1986-11-19
1992	1992-03-07	1992-11-04
1993	1993-02-16	1993-11-14
1994	1994-03-05	1994-12-09
1995	1995-02-24	1995-11-14
1996	1996-02-20	1996-11-21
1997	1997-03-02	1997-11-01
1998	1998-02-26	1998-10-18
1999	1999-02-07	1999-12-04
2000	2000-01-20	2000-11-01
2001	2001-02-25	2001-11-09
2002	2002-01-31	2002-11-11
2003	2003-02-04	2003-11-01
2004	2004-03-08	2004-11-02
2005	2005-02-15	2005-12-28
2006	2006-01-02	2006-11-29
2007	2007-02-27	2007-12-22

Every Fixed Threshold

Fixed thresholds at Dilley
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	85	228	1933	160
35 C (95 F): Days	85	134	1956	11
40 C (104 F): Days	69	31	1969	6
90 F (32.2 C): Days	85	188	1963	103
100 F (37.8 C): Days	84	85	1953	59
110 F (43.3 C): Days	7	2	1939	1
0 C (32 F): Ice days (max	10	4	1951	2
0 C (32 F): Frost days (min	78	31	1966	7
-10 C (14 F): Days with min	6	3	1951	1
20 C (68 F): Tropical nights (min	78	160	1927	142
25 C (77 F): Days with min	65	65	1917	4
10 mm (0.39 in): Days with 10 mm or more rain	91	32	1976	32
25 mm (0.98 in): Days with 25 mm or more rain	91	14	1958	11
50 mm (1.97 in): Days with 50 mm or more rain	78	6	1967	1
100 mm (3.94 in): Days with 100 mm or more rain	21	2	1980	1
200 mm (7.87 in): Days with 200 mm or more rain	3	2	2002	1
10 cm (3.9 in): Days with 10 cm or more snowfall	1	1	1926	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1917.

Download the Data

Data for Dilley 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).

Dilley Threshold Days by Year (USC00412458)

Key Facts for Dilley Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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