Altoona Blair Co AP Threshold Days by Year (USW00014736)

17 fixed thresholds counted per year at Altoona Blair Co AP (USW00014736): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Altoona Blair Co AP Thresholds

Altoona Blair Co AP: days with a maximum temperature at or above 30 C (86 F) in 70 years, most in 1991 with 45.
Altoona Blair Co AP: days with a maximum temperature at or below 0 C (32 F) in 70 years, most in 1978 with 71.
Altoona Blair Co AP: nights with a minimum temperature at or below 0 C (32 F) in 70 years, most in 1980 with 142.
Altoona Blair Co AP: nights with a minimum temperature at or below -10 C (14 F) in 70 years, most in 1978 with 49.
17 fixed thresholds have at least one qualifying day at Altoona Blair Co AP.

Days at or above 30 C (86 F)

70 years with a qualifying day

Days per year at Altoona Blair Co AP with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 45 in 1991.

Days at or above 30 C (86 F) per year at Altoona Blair Co AP
Year	Days	Decade average
1949	26	26
1950	7	26.2
1951	22	26.2
1952	41	26.2
1953	35	26.2
1954	26	26.2
1963	18	26.6
1964	28	26.6
1965	29	26.6
1966	35	26.6
1967	14	26.6
1968	38	26.6
1969	24	26.6
1970	30	15.8
1971	21	15.8
1972	23	15.8
1973	19	15.8
1974	13	15.8
1975	14	15.8
1976	6	15.8
1977	22	15.8
1978	8	15.8
1979	2	15.8
1980	10	18.5
1981	7	18.5
1982	2	18.5
1983	34	18.5
1984	18	18.5
1985	16	18.5
1986	10	18.5
1987	31	18.5
1988	42	18.5
1989	15	18.5
1990	14	26.4
1991	45	26.4
1992	8	26.4
1993	27	26.4
1994	36	26.4
1995	37	26.4
1996	10	26.4
1997	22	26.4
1998	34	26.4
1999	31	26.4
2000	1	16.7
2001	27	16.7
2002	39	16.7
2003	8	16.7
2004	4	16.7
2005	31	16.7
2006	16	16.7
2007	18	16.7
2008	17	16.7
2009	6	16.7
2010	40	29.5
2011	38	29.5
2012	34	29.5
2013	22	29.5
2014	8	29.5
2015	25	29.5
2016	45	29.5
2017	23	29.5
2018	35	29.5
2019	25	29.5
2020	37	28.7
2021	37	28.7
2022	21	28.7
2023	21	28.7
2024	41	28.7
2025	27	28.7
2026	17	28.7

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

First to last qualifying date each year at Altoona Blair Co AP
Year	First date	Last date
1949	1949-05-05	1949-08-27
1950	1950-06-07	1950-08-28
1951	1951-06-01	1951-10-05
1952	1952-06-06	1952-09-14
1953	1953-05-10	1953-09-30
1954	1954-04-20	1954-09-06
1963	1963-05-09	1963-08-17
1964	1964-05-19	1964-09-11
1965	1965-06-06	1965-09-22
1966	1966-06-09	1966-09-03
1967	1967-06-12	1967-08-04
1968	1968-06-06	1968-08-25
1969	1969-05-29	1969-09-01
1970	1970-05-01	1970-09-26
1971	1971-05-19	1971-09-10
1972	1972-06-15	1972-09-17
1973	1973-06-04	1973-09-03
1974	1974-06-09	1974-08-16
1975	1975-05-21	1975-08-26
1976	1976-04-18	1976-07-15
1977	1977-05-17	1977-09-02
1978	1978-06-02	1978-07-23
1979	1979-05-09	1979-08-01
1980	1980-06-27	1980-09-02
1981	1981-06-15	1981-07-20
1982	1982-07-18	1982-08-05
1983	1983-06-12	1983-09-19
1984	1984-06-05	1984-09-02
1985	1985-04-21	1985-09-20
1986	1986-06-11	1986-09-30
1987	1987-05-29	1987-08-21
1988	1988-05-30	1988-08-28
1989	1989-06-01	1989-09-10
1990	1990-04-26	1990-08-28
1991	1991-05-25	1991-09-18
1992	1992-05-23	1992-08-26
1993	1993-06-18	1993-09-14
1994	1994-04-26	1994-08-28
1995	1995-05-24	1995-09-07
1996	1996-05-18	1996-08-23
1997	1997-06-20	1997-08-16
1998	1998-05-16	1998-09-27
1999	1999-05-30	1999-08-17
2000	2000-06-11	2000-06-11
2001	2001-05-04	2001-09-13
2002	2002-06-23	2002-09-10
2003	2003-06-24	2003-08-14
2004	2004-06-09	2004-08-28
2005	2005-06-06	2005-09-22
2006	2006-05-29	2006-08-25
2007	2007-05-31	2007-09-25
2008	2008-05-26	2008-09-04
2009	2009-08-09	2009-08-20
2010	2010-05-01	2010-09-24
2011	2011-05-26	2011-09-04
2012	2012-04-16	2012-09-07
2013	2013-05-21	2013-10-06
2014	2014-05-13	2014-09-05
2015	2015-05-25	2015-09-19
2016	2016-05-28	2016-09-23
2017	2017-05-17	2017-09-27
2018	2018-04-14	2018-10-07
2019	2019-06-26	2019-10-02
2020	2020-05-26	2020-08-27
2021	2021-05-20	2021-08-26
2022	2022-05-21	2022-09-04
2023	2023-06-01	2023-09-06
2024	2024-04-29	2024-08-29
2025	2025-04-19	2025-08-17
2026	2026-05-18	2026-09-16

Every Fixed Threshold

Fixed thresholds at Altoona Blair Co AP
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	70	45	1991	17
35 C (95 F): Days	23	7	1988	3
90 F (32.2 C): Days	61	28	1988	8
100 F (37.8 C): Days	2	2	2011	2
0 C (32 F): Ice days (max	70	71	1978	31
0 C (32 F): Frost days (min	70	142	1980	73
-10 C (14 F): Days with min	70	49	1978	25
-20 C (-4 F): Days with min	25	6	1994	2
-30 C (-22 F): Days with min	1	1	1994	1
20 C (68 F): Tropical nights (min	66	38	2018	11
25 C (77 F): Days with min	5	2	1968	1
10 mm (0.39 in): Days with 10 mm or more rain	70	54	2018	28
25 mm (0.98 in): Days with 25 mm or more rain	70	14	1970	8
50 mm (1.97 in): Days with 50 mm or more rain	43	4	1972	1
100 mm (3.94 in): Days with 100 mm or more rain	5	2	2004	1
10 cm (3.9 in): Days with 10 cm or more snowfall	41	10	1994	4
25 cm (9.8 in): Days with 25 cm or more snowfall	13	2	1971	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1949.

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Data for Altoona Blair Co AP 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Altoona Blair Co AP Threshold Days by Year (USW00014736)

Key Facts for Altoona Blair Co AP Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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