Darby Threshold Days by Year

16 fixed thresholds counted per year at Darby (USC00242221): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Darby Thresholds

Darby: nights with a minimum temperature at or below 0 C (32 F) in 80 years, most in 1952 with 199.
Darby: nights with a minimum temperature at or below -10 C (14 F) in 80 years, most in 1955 with 63.
Darby: days with 10 mm (0.39 in) or more of precipitation in 80 years, most in 1995 with 21.
Darby: nights with a minimum temperature at or below -20 C (-4 F) in 75 years, most in 1949 with 19.
16 fixed thresholds have at least one qualifying day at Darby.

Days at or above 30 C (86 F)

73 years with a qualifying day

Days per year at Darby with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 69 in 2003.

Days at or above 30 C (86 F) per year at Darby
Year	Days	Decade average
1927	14	32.7
1928	38	32.7
1929	46	32.7
1930	23	31.8
1931	37	31.8
1932	19	31.8
1933	34	31.8
1934	30	31.8
1935	28	31.8
1936	42	31.8
1937	39	31.8
1938	29	31.8
1939	37	31.8
1940	41	23.9
1941	14	23.9
1942	31	23.9
1943	19	23.9
1944	20	23.9
1945	38	23.9
1946	22	23.9
1947	19	23.9
1948	11	23.9
1949	24	23.9
1950	14	25.6
1951	25	25.6
1952	23	25.6
1953	24	25.6
1954	18	25.6
1955	27	25.6
1956	24	25.6
1957	32	25.6
1958	35	25.6
1959	34	25.6
1960	34	38.8
1961	49	38.8
1962	22	38.8
1965	23	38.8
1966	50	38.8
1967	57	38.8
1968	32	38.8
1969	43	38.8
1970	47	33.6
1971	45	33.6
1972	33	33.6
1973	47	33.6
1975	26	33.6
1976	14	33.6
1977	31	33.6
1978	27	33.6
1979	32	33.6
1980	13	30
1981	41	30
1989	36	30
1990	46	39.2
1991	47	39.2
1992	40	39.2
1993	13	39.2
1994	48	39.2
1995	24	39.2
1996	48	39.2
1997	28	39.2
1998	53	39.2
1999	45	39.2
2000	48	50
2001	58	50
2002	45	50
2003	69	50
2004	42	50
2005	51	50
2006	48	50
2007	39	50
2010	29	25
2016	21	25

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

First to last qualifying date each year at Darby
Year	First date	Last date
1927	1927-07-03	1927-08-11
1928	1928-05-22	1928-09-05
1929	1929-06-25	1929-09-25
1930	1930-06-06	1930-08-25
1931	1931-05-13	1931-09-06
1932	1932-06-21	1932-08-20
1933	1933-06-13	1933-08-28
1934	1934-05-15	1934-08-31
1935	1935-06-22	1935-09-10
1936	1936-05-26	1936-09-21
1937	1937-06-22	1937-09-17
1938	1938-07-10	1938-09-22
1939	1939-06-29	1939-09-10
1940	1940-05-10	1940-09-10
1941	1941-06-22	1941-08-10
1942	1942-07-01	1942-10-09
1943	1943-07-06	1943-10-04
1944	1944-06-24	1944-09-11
1945	1945-06-21	1945-09-13
1946	1946-06-03	1946-09-13
1947	1947-07-02	1947-09-04
1948	1948-06-08	1948-09-14
1949	1949-05-26	1949-09-01
1950	1950-06-30	1950-09-03
1951	1951-07-12	1951-09-07
1952	1952-07-04	1952-09-26
1953	1953-07-06	1953-09-15
1954	1954-05-18	1954-08-09
1955	1955-06-21	1955-09-05
1956	1956-06-09	1956-09-08
1957	1957-06-03	1957-09-27
1958	1958-05-20	1958-09-07
1959	1959-06-12	1959-09-11
1960	1960-06-06	1960-08-21
1961	1961-06-15	1961-08-24
1962	1962-06-24	1962-08-26
1965	1965-06-10	1965-08-17
1966	1966-05-03	1966-09-11
1967	1967-06-29	1967-09-29
1968	1968-06-19	1968-09-01
1969	1969-06-04	1969-09-09
1970	1970-05-16	1970-08-31
1971	1971-06-22	1971-09-11
1972	1972-05-30	1972-08-30
1973	1973-05-15	1973-09-06
1975	1975-05-15	1975-09-08
1976	1976-06-19	1976-09-05
1977	1977-06-06	1977-09-08
1978	1978-07-10	1978-09-26
1979	1979-05-26	1979-09-22
1980	1980-07-22	1980-10-08
1981	1981-06-27	1981-09-19
1989	1989-06-09	1989-09-17
1990	1990-06-23	1990-09-30
1991	1991-07-03	1991-09-01
1992	1992-05-17	1992-10-02
1993	1993-05-12	1993-09-11
1994	1994-06-21	1994-09-28
1995	1995-06-27	1995-09-04
1996	1996-06-07	1996-10-05
1997	1997-07-09	1997-10-03
1998	1998-06-30	1998-09-17
1999	1999-05-24	1999-09-23
2000	2000-06-04	2000-09-17
2001	2001-05-12	2001-09-26
2002	2002-05-20	2002-09-17
2003	2003-05-25	2003-09-08
2004	2004-06-04	2004-09-02
2005	2005-06-21	2005-09-08
2006	2006-05-16	2006-08-30
2007	2007-06-03	2007-08-26
2010	2010-06-27	2010-09-29
2016	2016-06-05	2016-08-30

Every Fixed Threshold

Fixed thresholds at Darby
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	73	69	2003	21
35 C (95 F): Days	59	26	2003	1
40 C (104 F): Days	4	1	1937	1
90 F (32.2 C): Days	73	53	2003	11
100 F (37.8 C): Days	17	9	2003	2
0 C (32 F): Ice days (max	73	51	1949	29
0 C (32 F): Frost days (min	80	199	1952	126
-10 C (14 F): Days with min	80	63	1955	26
-20 C (-4 F): Days with min	75	19	1949	5
-30 C (-22 F): Days with min	23	7	1937	2
20 C (68 F): Tropical nights (min	4	1	1940	1
10 mm (0.39 in): Days with 10 mm or more rain	80	21	1995	3
25 mm (0.98 in): Days with 25 mm or more rain	45	4	1973	1
50 mm (1.97 in): Days with 50 mm or more rain	1	1	1938	1
10 cm (3.9 in): Days with 10 cm or more snowfall	28	11	1955	2
25 cm (9.8 in): Days with 25 cm or more snowfall	4	1	1936	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1927.

Download the Data

Data for Darby 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 2026-10-14 (14 October 2026). Threshold counts are computed by this site.

Data as of 2026-10-12. Last revised 12 October 2026 (2026-10-12).

Darby Threshold Days by Year

Key Facts for Darby Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

Related