Powell Threshold Days by Year (USC00487380)

14 fixed thresholds counted per year at Powell (USC00487380): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Powell Thresholds

Powell: days with a maximum temperature at or above 30 C (86 F) in 71 years, most in 1966 with 72.
Powell: days with a maximum temperature at or above 90 F (32.2 C) in 71 years, most in 1966 with 48.
Powell: days with a maximum temperature at or below 0 C (32 F) in 71 years, most in 1978 with 84.
Powell: nights with a minimum temperature at or below 0 C (32 F) in 71 years, most in 1912 with 206.
14 fixed thresholds have at least one qualifying day at Powell.

Days at or above 30 C (86 F)

71 years with a qualifying day

Days per year at Powell with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 72 in 1966.

Days at or above 30 C (86 F) per year at Powell
Year	Days	Decade average
1909	48	48
1910	46	34.5
1911	35	34.5
1912	23	34.5
1913	28	34.5
1914	38	34.5
1915	16	34.5
1916	34	34.5
1917	40	34.5
1918	29	34.5
1919	56	34.5
1920	36	35.8
1921	46	35.8
1922	40	35.8
1923	35	35.8
1924	29	35.8
1925	34	35.8
1926	24	35.8
1927	18	35.8
1929	60	35.8
1930	53	49.4
1931	62	49.4
1932	64	49.4
1933	52	49.4
1934	35	49.4
1935	43	49.4
1936	63	49.4
1937	45	49.4
1938	33	49.4
1939	44	49.4
1940	58	38.7
1941	35	38.7
1942	34	38.7
1943	48	38.7
1944	26	38.7
1945	33	38.7
1946	36	38.7
1947	46	38.7
1948	41	38.7
1949	30	38.7
1950	18	45.2
1951	24	45.2
1952	43	45.2
1953	51	45.2
1954	50	45.2
1955	52	45.2
1956	54	45.2
1957	51	45.2
1958	41	45.2
1959	68	45.2
1960	66	54.1
1961	60	54.1
1962	46	54.1
1963	57	54.1
1964	52	54.1
1965	34	54.1
1966	72	54.1
1967	51	54.1
1968	44	54.1
1969	59	54.1
1970	70	56.3
1971	66	56.3
1972	48	56.3
1973	54	56.3
1974	57	56.3
1975	41	56.3
1976	59	56.3
1977	50	56.3
1978	55	56.3
1979	63	56.3
1980	52	52

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

First to last qualifying date each year at Powell
Year	First date	Last date
1909	1909-06-17	1909-09-28
1910	1910-06-11	1910-10-10
1911	1911-05-05	1911-09-12
1912	1912-06-21	1912-08-25
1913	1913-06-21	1913-09-05
1914	1914-06-18	1914-09-20
1915	1915-06-25	1915-09-01
1916	1916-06-18	1916-09-09
1917	1917-06-09	1917-09-21
1918	1918-06-09	1918-09-01
1919	1919-05-23	1919-09-12
1920	1920-06-07	1920-09-20
1921	1921-06-11	1921-09-01
1922	1922-05-25	1922-10-03
1923	1923-06-12	1923-09-15
1924	1924-06-14	1924-09-04
1925	1925-05-20	1925-09-03
1926	1926-06-05	1926-08-30
1927	1927-06-18	1927-09-06
1929	1929-05-25	1929-09-15
1930	1930-05-28	1930-09-05
1931	1931-05-15	1931-09-09
1932	1932-05-22	1932-09-09
1933	1933-06-13	1933-09-17
1934	1934-05-07	1934-08-29
1935	1935-06-12	1935-09-14
1936	1936-05-14	1936-09-22
1937	1937-05-18	1937-09-19
1938	1938-06-05	1938-09-22
1939	1939-04-29	1939-09-01
1940	1940-05-31	1940-09-08
1941	1941-05-12	1941-08-12
1942	1942-07-04	1942-09-09
1943	1943-06-18	1943-09-17
1944	1944-06-24	1944-09-13
1945	1945-06-21	1945-09-05
1946	1946-06-04	1946-09-14
1947	1947-06-19	1947-09-23
1948	1948-05-17	1948-09-15
1949	1949-06-10	1949-08-22
1950	1950-06-30	1950-09-05
1951	1951-07-04	1951-08-22
1952	1952-06-05	1952-09-26
1953	1953-06-11	1953-10-01
1954	1954-05-19	1954-09-12
1955	1955-06-21	1955-09-14
1956	1956-05-19	1956-09-20
1957	1957-06-03	1957-09-28
1958	1958-05-20	1958-09-11
1959	1959-06-03	1959-09-15
1960	1960-05-11	1960-09-20
1961	1961-06-07	1961-08-31
1962	1962-06-23	1962-09-07
1963	1963-06-13	1963-10-04
1964	1964-05-19	1964-08-31
1965	1965-06-12	1965-08-16
1966	1966-05-04	1966-09-23
1967	1967-05-22	1967-09-06
1968	1968-06-02	1968-09-11
1969	1969-05-24	1969-09-03
1970	1970-05-17	1970-09-05
1971	1971-05-27	1971-09-14
1972	1972-05-16	1972-09-18
1973	1973-05-31	1973-08-31
1974	1974-06-12	1974-09-26
1975	1975-07-01	1975-09-15
1976	1976-05-28	1976-09-06
1977	1977-06-01	1977-09-08
1978	1978-05-15	1978-09-08
1979	1979-05-27	1979-09-19
1980	1980-04-21	1980-10-01

Every Fixed Threshold

Fixed thresholds at Powell
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	71	72	1966	52
35 C (95 F): Days	67	23	1970	9
90 F (32.2 C): Days	71	48	1966	36
100 F (37.8 C): Days	20	5	1931	2
0 C (32 F): Ice days (max	71	84	1978	36
0 C (32 F): Frost days (min	71	206	1912	182
-10 C (14 F): Days with min	71	103	1919	76
-20 C (-4 F): Days with min	69	47	1916	13
-30 C (-22 F): Days with min	32	10	1916	4
20 C (68 F): Tropical nights (min	24	3	1910	1
10 mm (0.39 in): Days with 10 mm or more rain	68	10	1932	4
25 mm (0.98 in): Days with 25 mm or more rain	18	3	1918	1
10 cm (3.9 in): Days with 10 cm or more snowfall	30	4	1929	1
25 cm (9.8 in): Days with 25 cm or more snowfall	3	1	1959	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1909.

Download the Data

Data for Powell 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).

Powell Threshold Days by Year (USC00487380)

Key Facts for Powell Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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