Denison Dam Threshold Days by Year (USC00412394)

15 fixed thresholds counted per year at Denison Dam (USC00412394): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Denison Dam Thresholds

Denison Dam: days with 10 mm (0.39 in) or more of precipitation in 56 years, most in 1957 with 43.
Denison Dam: days with 25 mm (0.98 in) or more of precipitation in 56 years, most in 1994 with 20.
Denison Dam: days with a maximum temperature at or above 30 C (86 F) in 54 years, most in 1956 with 149.
Denison Dam: days with a maximum temperature at or above 35 C (95 F) in 54 years, most in 1980 with 93.
15 fixed thresholds have at least one qualifying day at Denison Dam.

Days at or above 30 C (86 F)

54 years with a qualifying day

Days per year at Denison Dam with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 149 in 1956.

Days at or above 30 C (86 F) per year at Denison Dam
Year	Days	Decade average
1941	122	119.6
1942	106	119.6
1943	128	119.6
1944	114	119.6
1946	105	119.6
1948	140	119.6
1949	122	119.6
1950	109	124.3
1951	125	124.3
1952	136	124.3
1953	133	124.3
1954	133	124.3
1955	129	124.3
1956	149	124.3
1957	97	124.3
1958	114	124.3
1959	118	124.3
1960	123	118.5
1961	95	118.5
1962	131	118.5
1963	143	118.5
1964	110	118.5
1965	120	118.5
1966	115	118.5
1967	118	118.5
1968	107	118.5
1969	123	118.5
1970	110	109.4
1971	116	109.4
1972	131	109.4
1973	98	109.4
1974	84	109.4
1975	114	109.4
1976	94	109.4
1977	120	109.4
1978	120	109.4
1979	107	109.4
1980	128	112.1
1981	104	112.1
1982	111	112.1
1983	107	112.1
1984	117	112.1
1985	114	112.1
1986	104	112.1
1987	104	112.1
1988	127	112.1
1989	105	112.1
1990	102	96.1
1991	109	96.1
1992	85	96.1
1993	100	96.1
1994	99	96.1
1995	81	96.1
1996	97	96.1

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

First to last qualifying date each year at Denison Dam
Year	First date	Last date
1941	1941-05-06	1941-10-23
1942	1942-05-12	1942-10-29
1943	1943-04-04	1943-10-22
1944	1944-05-11	1944-10-06
1946	1946-03-30	1946-10-30
1948	1948-04-07	1948-11-05
1949	1949-04-08	1949-10-21
1950	1950-04-03	1950-11-19
1951	1951-03-22	1951-10-30
1952	1952-03-31	1952-10-27
1953	1953-05-08	1953-10-18
1954	1954-03-11	1954-10-13
1955	1955-03-04	1955-12-24
1956	1956-03-06	1956-10-12
1957	1957-05-14	1957-10-04
1958	1958-04-04	1958-10-20
1959	1959-03-14	1959-10-10
1960	1960-04-06	1960-10-13
1961	1961-05-17	1961-09-29
1962	1962-05-06	1962-10-15
1963	1963-03-30	1963-10-18
1964	1964-05-04	1964-10-18
1965	1965-04-10	1965-10-11
1966	1966-03-31	1966-10-14
1967	1967-03-11	1967-10-07
1968	1968-05-14	1968-10-14
1969	1969-04-09	1969-10-12
1970	1970-05-19	1970-10-03
1971	1971-03-13	1971-10-03
1972	1972-04-06	1972-10-18
1973	1973-05-11	1973-10-09
1974	1974-03-19	1974-09-12
1975	1975-04-25	1975-10-24
1976	1976-03-03	1976-10-12
1977	1977-05-16	1977-11-01
1978	1978-04-05	1978-10-22
1979	1979-05-11	1979-10-22
1980	1980-04-08	1980-10-11
1981	1981-05-01	1981-10-18
1982	1982-04-17	1982-11-01
1983	1983-05-01	1983-10-05
1984	1984-04-21	1984-10-09
1985	1985-05-13	1985-10-15
1986	1986-02-20	1986-10-04
1987	1987-04-12	1987-11-05
1988	1988-04-05	1988-10-23
1989	1989-03-13	1989-10-16
1990	1990-04-30	1990-10-08
1991	1991-03-06	1991-10-25
1992	1992-05-12	1992-10-17
1993	1993-05-16	1993-10-17
1994	1994-03-20	1994-10-07
1995	1995-03-23	1995-10-17
1996	1996-02-22	1996-09-24

Every Fixed Threshold

Fixed thresholds at Denison Dam
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	54	149	1956	97
35 C (95 F): Days	54	93	1980	19
40 C (104 F): Days	23	18	1956	2
90 F (32.2 C): Days	54	125	1956	60
100 F (37.8 C): Days	47	52	1980	7
0 C (32 F): Ice days (max	47	19	1978	11
0 C (32 F): Frost days (min	52	78	1978	50
-10 C (14 F): Days with min	37	15	1963	7
20 C (68 F): Tropical nights (min	52	110	1980	104
25 C (77 F): Days with min	47	33	1980	8
10 mm (0.39 in): Days with 10 mm or more rain	56	43	1957	32
25 mm (0.98 in): Days with 25 mm or more rain	56	20	1994	19
50 mm (1.97 in): Days with 50 mm or more rain	53	7	1946	3
100 mm (3.94 in): Days with 100 mm or more rain	22	2	1948	1
10 cm (3.9 in): Days with 10 cm or more snowfall	9	1	1942	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1941.

Download the Data

Data for Denison Dam 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).

Denison Dam Threshold Days by Year (USC00412394)

Key Facts for Denison Dam Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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