Duncan Threshold Days by Year (USC00342660)

19 fixed thresholds counted per year at Duncan (USC00342660): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Duncan Thresholds

Duncan: days with 10 mm (0.39 in) or more of precipitation in 82 years, most in 2020 with 38.
Duncan: days with 25 mm (0.98 in) or more of precipitation in 82 years, most in 2018 with 22.
Duncan: days with 50 mm (1.97 in) or more of precipitation in 77 years, most in 1950 with 8.
Duncan: days with a maximum temperature at or above 30 C (86 F) in 64 years, most in 1963 with 172.
19 fixed thresholds have at least one qualifying day at Duncan.

Days at or above 30 C (86 F)

64 years with a qualifying day

Days per year at Duncan with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 172 in 1963.

Days at or above 30 C (86 F) per year at Duncan
Year	Days	Decade average
1937	142	147.3
1938	146	147.3
1939	154	147.3
1940	100	114.7
1941	99	114.7
1942	98	114.7
1944	112	114.7
1945	115	114.7
1946	118	114.7
1947	136	114.7
1948	134	114.7
1949	120	114.7
1950	116	133.3
1951	135	133.3
1952	145	133.3
1953	136	133.3
1954	144	133.3
1955	137	133.3
1956	156	133.3
1957	104	133.3
1958	122	133.3
1959	138	133.3
1960	137	125.1
1961	106	125.1
1962	136	125.1
1963	172	125.1
1965	114	125.1
1966	115	125.1
1968	107	125.1
1969	114	125.1
1970	119	121.3
1971	120	121.3
1972	146	121.3
1974	113	121.3
1975	113	121.3
1979	117	121.3
1980	129	111.1
1981	107	111.1
1982	103	111.1
1983	107	111.1
1984	125	111.1
1988	112	111.1
1989	95	111.1
1990	80	98.8
1991	99	98.8
1992	84	98.8
1993	95	98.8
1994	108	98.8
1995	96	98.8
1996	101	98.8
1997	99	98.8
1998	126	98.8
1999	100	98.8
2000	116	104.4
2001	102	104.4
2003	95	104.4
2004	86	104.4
2005	123	104.4
2006	124	104.4
2007	90	104.4
2008	105	104.4
2009	99	104.4
2010	115	125
2011	135	125

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

First to last qualifying date each year at Duncan
Year	First date	Last date
1937	1937-04-15	1937-10-29
1938	1938-03-14	1938-10-30
1939	1939-03-14	1939-10-25
1940	1940-03-31	1940-10-23
1941	1941-05-08	1941-10-13
1942	1942-04-04	1942-10-10
1944	1944-04-05	1944-10-06
1945	1945-05-01	1945-11-07
1946	1946-03-25	1946-10-23
1947	1947-03-24	1947-10-24
1948	1948-04-07	1948-10-16
1949	1949-04-08	1949-11-20
1950	1950-04-02	1950-10-31
1951	1951-03-22	1951-10-21
1952	1952-03-31	1952-10-26
1953	1953-03-20	1953-10-13
1954	1954-03-10	1954-10-18
1955	1955-03-10	1955-12-24
1956	1956-02-25	1956-10-12
1957	1957-05-14	1957-10-05
1958	1958-04-23	1958-10-24
1959	1959-04-01	1959-10-10
1960	1960-04-06	1960-10-12
1961	1961-04-04	1961-10-12
1962	1962-04-14	1962-10-22
1963	1963-03-27	1963-10-27
1965	1965-04-04	1965-10-11
1966	1966-03-31	1966-10-14
1968	1968-05-01	1968-10-14
1969	1969-04-08	1969-10-11
1970	1970-04-27	1970-10-07
1971	1971-03-13	1971-10-11
1972	1972-03-26	1972-10-18
1974	1974-03-18	1974-09-28
1975	1975-04-17	1975-10-14
1979	1979-03-30	1979-10-22
1980	1980-04-17	1980-11-08
1981	1981-04-09	1981-10-15
1982	1982-04-13	1982-10-09
1983	1983-04-30	1983-10-06
1984	1984-04-21	1984-10-13
1988	1988-03-25	1988-10-18
1989	1989-03-13	1989-10-14
1990	1990-05-16	1990-10-07
1991	1991-03-06	1991-10-19
1992	1992-05-02	1992-11-01
1993	1993-04-13	1993-10-07
1994	1994-03-18	1994-10-06
1995	1995-03-23	1995-10-31
1996	1996-02-21	1996-09-12
1997	1997-03-22	1997-10-07
1998	1998-05-13	1998-10-05
1999	1999-04-23	1999-10-16
2000	2000-04-06	2000-10-06
2001	2001-05-15	2001-10-05
2003	2003-04-20	2003-10-25
2004	2004-04-21	2004-10-22
2005	2005-05-11	2005-10-24
2006	2006-03-02	2006-10-05
2007	2007-06-06	2007-10-21
2008	2008-03-28	2008-10-05
2009	2009-03-06	2009-09-28
2010	2010-03-31	2010-09-24
2011	2011-02-27	2011-10-05

Every Fixed Threshold

Fixed thresholds at Duncan
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	64	172	1963	135
35 C (95 F): Days	64	95	1963	93
40 C (104 F): Days	35	46	2011	46
90 F (32.2 C): Days	64	137	1963	115
100 F (37.8 C): Days	59	73	2011	73
110 F (43.3 C): Days	3	3	1946	2
0 C (32 F): Ice days (max	58	18	1979	5
0 C (32 F): Frost days (min	63	85	1937	69
-10 C (14 F): Days with min	59	16	1979	10
-20 C (-4 F): Days with min	2	2	1947	2
20 C (68 F): Tropical nights (min	63	116	1998	102
25 C (77 F): Days with min	50	52	2011	52
10 mm (0.39 in): Days with 10 mm or more rain	82	38	2020	22
25 mm (0.98 in): Days with 25 mm or more rain	82	22	2018	14
50 mm (1.97 in): Days with 50 mm or more rain	77	8	1950	5
100 mm (3.94 in): Days with 100 mm or more rain	17	4	2007	2
200 mm (7.87 in): Days with 200 mm or more rain	1	1	1955	1
10 cm (3.9 in): Days with 10 cm or more snowfall	17	2	1937	1
25 cm (9.8 in): Days with 25 cm or more snowfall	1	1	1988	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1937.

Download the Data

Data for Duncan 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).

Duncan Threshold Days by Year (USC00342660)

Key Facts for Duncan Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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