Powell Threshold Days by Year

15 fixed thresholds counted per year at Powell (USC00107320): 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 47 years, most in 1990 with 51.
Powell: days with a maximum temperature at or above 90 F (32.2 C) in 47 years, most in 1988 with 34.
Powell: days with a maximum temperature at or below 0 C (32 F) in 47 years, most in 2007 with 58.
Powell: nights with a minimum temperature at or below 0 C (32 F) in 47 years, most in 1971 with 248.
15 fixed thresholds have at least one qualifying day at Powell.

Days at or above 30 C (86 F)

47 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 51 in 1990.

Days at or above 30 C (86 F) per year at Powell
Year	Days	Decade average
1963	40	32.9
1964	20	32.9
1965	22	32.9
1966	38	32.9
1967	44	32.9
1968	28	32.9
1969	38	32.9
1970	48	35.7
1971	46	35.7
1972	37	35.7
1973	45	35.7
1974	36	35.7
1975	21	35.7
1976	21	35.7
1977	32	35.7
1978	26	35.7
1979	45	35.7
1980	17	35.5
1981	44	35.5
1982	32	35.5
1983	12	35.5
1984	40	35.5
1985	41	35.5
1986	47	35.5
1987	43	35.5
1988	49	35.5
1989	30	35.5
1990	51	30.8
1991	38	30.8
1992	37	30.8
1993	14	30.8
1995	16	30.8
1996	34	30.8
1997	16	30.8
1998	40	30.8
2000	26	31.7
2003	45	31.7
2004	27	31.7
2005	31	31.7
2007	43	31.7
2008	19	31.7
2009	31	31.7
2010	20	31.3
2011	34	31.3
2012	40	31.3
2025	44	44.5
2026	45	44.5

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
1963	1963-06-19	1963-10-03
1964	1964-06-25	1964-08-18
1965	1965-06-11	1965-08-19
1966	1966-05-05	1966-09-23
1967	1967-06-20	1967-09-29
1968	1968-06-19	1968-09-11
1969	1969-06-04	1969-09-11
1970	1970-06-03	1970-09-01
1971	1971-06-22	1971-09-11
1972	1972-05-30	1972-08-30
1973	1973-05-15	1973-09-11
1974	1974-06-13	1974-09-04
1975	1975-07-03	1975-08-06
1976	1976-06-29	1976-09-17
1977	1977-04-25	1977-08-22
1978	1978-06-29	1978-09-27
1979	1979-06-12	1979-09-21
1980	1980-05-22	1980-08-15
1981	1981-06-26	1981-09-19
1982	1982-06-21	1982-09-04
1983	1983-05-28	1983-09-01
1984	1984-05-30	1984-09-19
1985	1985-05-24	1985-08-30
1986	1986-05-26	1986-08-31
1987	1987-04-28	1987-10-03
1988	1988-05-13	1988-10-11
1989	1989-06-30	1989-09-30
1990	1990-06-10	1990-09-25
1991	1991-07-03	1991-09-28
1992	1992-05-06	1992-10-03
1993	1993-05-12	1993-08-20
1995	1995-07-07	1995-09-05
1996	1996-06-08	1996-09-13
1997	1997-07-05	1997-09-10
1998	1998-07-01	1998-09-17
2000	2000-06-05	2000-08-31
2003	2003-05-25	2003-09-06
2004	2004-06-23	2004-09-01
2005	2005-06-21	2005-09-03
2007	2007-06-03	2007-08-31
2008	2008-06-22	2008-08-25
2009	2009-06-25	2009-09-25
2010	2010-06-29	2010-08-27
2011	2011-06-23	2011-09-25
2012	2012-05-16	2012-08-29
2025	2025-05-29	2025-09-08
2026	2026-05-26	2026-08-28

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	47	51	1990	45
35 C (95 F): Days	43	14	1967	3
40 C (104 F): Days	1	1	1969	1
90 F (32.2 C): Days	47	34	1988	23
100 F (37.8 C): Days	14	3	1969	1
0 C (32 F): Ice days (max	47	58	2007	19
0 C (32 F): Frost days (min	47	248	1971	116
-10 C (14 F): Days with min	47	87	1985	7
-20 C (-4 F): Days with min	44	20	1972	4
-30 C (-22 F): Days with min	9	4	1989	2
10 mm (0.39 in): Days with 10 mm or more rain	39	47	1964	30
25 mm (0.98 in): Days with 25 mm or more rain	38	11	1972	9
50 mm (1.97 in): Days with 50 mm or more rain	5	1	1964	1
10 cm (3.9 in): Days with 10 cm or more snowfall	35	48	1964	6
25 cm (9.8 in): Days with 25 cm or more snowfall	27	8	1964	3

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1963.

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 2026-10-15 (15 October 2026). Threshold counts are computed by this site.

Data as of 2026-10-15. Last revised 15 October 2026 (2026-10-15).

Powell Threshold Days by Year

Key Facts for Powell Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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