Willow Grove NAS Threshold Days by Year (USW00014793)

19 fixed thresholds counted per year at Willow Grove NAS (USW00014793): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Willow Grove NAS Thresholds

Willow Grove NAS: days with a maximum temperature at or above 30 C (86 F) in 65 years, most in 2002 with 84.
Willow Grove NAS: days with a maximum temperature at or above 90 F (32.2 C) in 65 years, most in 2002 with 53.
Willow Grove NAS: days with a maximum temperature at or below 0 C (32 F) in 65 years, most in 1978 with 49.
Willow Grove NAS: nights with a minimum temperature at or below 0 C (32 F) in 65 years, most in 1969 with 123.
19 fixed thresholds have at least one qualifying day at Willow Grove NAS.

Days at or above 30 C (86 F)

65 years with a qualifying day

Days per year at Willow Grove NAS with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 84 in 2002.

Days at or above 30 C (86 F) per year at Willow Grove NAS
Year	Days	Decade average
1946	19	32
1947	34	32
1948	30	32
1949	45	32
1950	24	44.4
1951	40	44.4
1952	48	44.4
1953	52	44.4
1954	37	44.4
1955	48	44.4
1956	41	44.4
1957	59	44.4
1958	34	44.4
1959	61	44.4
1960	31	34.1
1961	48	34.1
1962	29	34.1
1963	29	34.1
1964	33	34.1
1965	32	34.1
1966	48	34.1
1967	16	34.1
1968	39	34.1
1969	36	34.1
1970	49	31.8
1971	42	31.8
1972	22	31.8
1973	34	31.8
1974	22	31.8
1975	23	31.8
1976	33	31.8
1977	36	31.8
1978	28	31.8
1979	29	31.8
1980	50	49.2
1981	35	49.2
1982	18	49.2
1983	60	49.2
1984	40	49.2
1985	52	49.2
1986	59	49.2
1987	67	49.2
1988	66	49.2
1989	45	49.2
1990	51	50.3
1991	70	50.3
1992	39	50.3
1993	70	50.3
1994	62	50.3
1995	45	50.3
1996	39	50.3
1997	32	50.3
1998	47	50.3
1999	48	50.3
2000	56	45
2001	77	45
2002	84	45
2003	22	45
2004	23	45
2005	43	45
2006	37	45
2007	47	45
2008	37	45
2009	24	45
2010	70	70

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

First to last qualifying date each year at Willow Grove NAS
Year	First date	Last date
1946	1946-06-08	1946-09-18
1947	1947-05-13	1947-09-14
1948	1948-05-11	1948-09-18
1949	1949-05-04	1949-10-10
1950	1950-06-07	1950-09-01
1951	1951-05-16	1951-10-05
1952	1952-06-06	1952-09-13
1953	1953-05-10	1953-09-05
1954	1954-06-01	1954-10-13
1955	1955-05-05	1955-09-20
1956	1956-05-13	1956-09-23
1957	1957-04-27	1957-09-22
1958	1958-06-11	1958-09-26
1959	1959-05-07	1959-10-06
1960	1960-04-14	1960-09-01
1961	1961-06-02	1961-09-24
1962	1962-04-27	1962-09-01
1963	1963-05-09	1963-08-23
1964	1964-05-23	1964-09-11
1965	1965-05-26	1965-09-22
1966	1966-06-05	1966-09-03
1967	1967-06-10	1967-08-19
1968	1968-06-06	1968-09-25
1969	1969-05-29	1969-09-07
1970	1970-05-10	1970-09-26
1971	1971-05-19	1971-09-09
1972	1972-06-04	1972-09-17
1973	1973-06-04	1973-09-05
1974	1974-05-17	1974-08-30
1975	1975-06-18	1975-08-26
1976	1976-04-17	1976-09-14
1977	1977-05-17	1977-09-03
1978	1978-05-20	1978-09-18
1979	1979-05-09	1979-09-04
1980	1980-06-03	1980-09-22
1981	1981-05-25	1981-09-14
1982	1982-06-28	1982-08-17
1983	1983-04-28	1983-09-20
1984	1984-05-22	1984-09-24
1985	1985-04-19	1985-09-20
1986	1986-05-05	1986-09-30
1987	1987-05-10	1987-09-10
1988	1988-05-23	1988-09-23
1989	1989-05-18	1989-09-21
1990	1990-04-26	1990-09-02
1991	1991-04-08	1991-09-17
1992	1992-05-21	1992-09-10
1993	1993-05-10	1993-09-15
1994	1994-04-25	1994-09-17
1995	1995-06-07	1995-09-07
1996	1996-05-11	1996-09-08
1997	1997-05-19	1997-08-17
1998	1998-03-30	1998-09-27
1999	1999-05-30	1999-08-29
2000	2000-05-06	2000-10-04
2001	2001-04-09	2001-09-22
2002	2002-04-16	2002-10-05
2003	2003-06-23	2003-08-22
2004	2004-04-19	2004-08-29
2005	2005-06-05	2005-09-23
2006	2006-05-29	2006-08-22
2007	2007-05-25	2007-10-08
2008	2008-06-07	2008-09-14
2009	2009-04-25	2009-08-21
2010	2010-04-06	2010-09-25

Every Fixed Threshold

Fixed thresholds at Willow Grove NAS
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	65	84	2002	70
35 C (95 F): Days	46	26	2002	5
40 C (104 F): Days	1	1	2001	1
90 F (32.2 C): Days	65	53	2002	33
100 F (37.8 C): Days	12	4	1988	2
0 C (32 F): Ice days (max	65	49	1978	20
0 C (32 F): Frost days (min	65	123	1969	92
-10 C (14 F): Days with min	65	31	1963	7
-20 C (-4 F): Days with min	7	2	1977	1
20 C (68 F): Tropical nights (min	65	59	2005	50
25 C (77 F): Days with min	16	6	1988	3
10 mm (0.39 in): Days with 10 mm or more rain	62	54	1979	31
25 mm (0.98 in): Days with 25 mm or more rain	62	24	1983	12
50 mm (1.97 in): Days with 50 mm or more rain	53	7	1979	5
100 mm (3.94 in): Days with 100 mm or more rain	11	1	1950	1
200 mm (7.87 in): Days with 200 mm or more rain	1	1	2001	1
10 cm (3.9 in): Days with 10 cm or more snowfall	53	6	1961	2
25 cm (9.8 in): Days with 25 cm or more snowfall	16	2	2000	1
50 cm (19.7 in): Days with 50 cm or more snowfall	1	1	1996	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1946.

Download the Data

Data for Willow Grove NAS 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).

Willow Grove NAS Threshold Days by Year (USW00014793)

Key Facts for Willow Grove NAS Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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