Duncan Threshold Days by Year (CA001012550)

15 fixed thresholds counted per year at Duncan (CA001012550): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Duncan Thresholds

Duncan: nights with a minimum temperature at or below 0 C (32 F) in 31 years, most in 1927 with 126.
Duncan: days with 10 mm (0.39 in) or more of precipitation in 31 years, most in 1950 with 53.
Duncan: days with 25 mm (0.98 in) or more of precipitation in 31 years, most in 1954 with 14.
Duncan: days with a maximum temperature at or above 30 C (86 F) in 30 years, most in 1942 with 30.
15 fixed thresholds have at least one qualifying day at Duncan.

Days at or above 30 C (86 F)

30 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 30 in 1942.

Days at or above 30 C (86 F) per year at Duncan
Year	Days	Decade average
1927	13	12.7
1928	19	12.7
1929	6	12.7
1930	7	13.6
1931	12	13.6
1932	9	13.6
1933	15	13.6
1934	14	13.6
1935	19	13.6
1936	11	13.6
1937	12	13.6
1938	19	13.6
1939	18	13.6
1940	18	16.4
1941	19	16.4
1942	30	16.4
1943	15	16.4
1944	22	16.4
1945	16	16.4
1946	20	16.4
1947	8	16.4
1948	13	16.4
1949	3	16.4
1950	14	11.7
1951	13	11.7
1952	16	11.7
1953	5	11.7
1954	1	11.7
1955	12	11.7
1956	21	11.7

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
1927	1927-07-16	1927-08-18
1928	1928-05-14	1928-09-22
1929	1929-07-13	1929-09-16
1930	1930-07-12	1930-08-28
1931	1931-06-05	1931-08-28
1932	1932-06-09	1932-09-28
1933	1933-06-12	1933-08-27
1934	1934-04-19	1934-09-03
1935	1935-06-06	1935-09-29
1936	1936-05-26	1936-10-10
1937	1937-06-01	1937-09-14
1938	1938-06-06	1938-09-14
1939	1939-05-13	1939-08-22
1940	1940-05-29	1940-09-23
1941	1941-06-11	1941-08-19
1942	1942-06-05	1942-09-21
1943	1943-06-28	1943-10-07
1944	1944-05-27	1944-09-11
1945	1945-06-24	1945-09-12
1946	1946-05-03	1946-09-10
1947	1947-05-23	1947-09-22
1948	1948-06-06	1948-09-09
1949	1949-06-05	1949-08-28
1950	1950-06-16	1950-09-03
1951	1951-06-27	1951-09-15
1952	1952-06-18	1952-09-22
1953	1953-07-06	1953-09-05
1954	1954-07-13	1954-07-13
1955	1955-06-08	1955-09-05
1956	1956-05-18	1956-09-06

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	30	30	1942	21
35 C (95 F): Days	18	10	1942	4
40 C (104 F): Days	1	2	1941	2
90 F (32.2 C): Days	28	17	1942	10
100 F (37.8 C): Days	5	3	1941	1
0 C (32 F): Ice days (max	21	19	1950	6
0 C (32 F): Frost days (min	31	126	1927	76
-10 C (14 F): Days with min	22	17	1950	7
-20 C (-4 F): Days with min	1	2	1950	2
10 mm (0.39 in): Days with 10 mm or more rain	31	53	1950	31
25 mm (0.98 in): Days with 25 mm or more rain	31	14	1954	5
50 mm (1.97 in): Days with 50 mm or more rain	9	2	1935	2
100 mm (3.94 in): Days with 100 mm or more rain	2	1	1935	1
10 cm (3.9 in): Days with 10 cm or more snowfall	22	6	1950	3
25 cm (9.8 in): Days with 25 cm or more snowfall	8	2	1937	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 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Duncan Threshold Days by Year (CA001012550)

Key Facts for Duncan Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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