Cottonwood Threshold Days by Year (USC00102154)

16 fixed thresholds counted per year at Cottonwood (USC00102154): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Cottonwood Thresholds

Cottonwood: days with a maximum temperature at or above 30 C (86 F) in 47 years, most in 1934 with 47.
Cottonwood: days with a maximum temperature at or below 0 C (32 F) in 47 years, most in 1917 with 63.
Cottonwood: days with 10 mm (0.39 in) or more of precipitation in 47 years, most in 1921 with 26.
Cottonwood: nights with a minimum temperature at or below 0 C (32 F) in 46 years, most in 1954 with 190.
16 fixed thresholds have at least one qualifying day at Cottonwood.

Days at or above 30 C (86 F)

47 years with a qualifying day

Days per year at Cottonwood with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 47 in 1934.

Days at or above 30 C (86 F) per year at Cottonwood
Year	Days	Decade average
1914	13	13.3
1915	11	13.3
1916	7	13.3
1917	14	13.3
1918	15	13.3
1919	20	13.3
1920	14	18.4
1921	7	18.4
1922	20	18.4
1923	13	18.4
1924	22	18.4
1925	29	18.4
1926	24	18.4
1927	11	18.4
1928	26	18.4
1932	24	35.4
1933	30	35.4
1934	47	35.4
1935	29	35.4
1936	40	35.4
1937	32	35.4
1938	40	35.4
1939	41	35.4
1940	40	22.1
1941	15	22.1
1944	22	22.1
1945	32	22.1
1946	18	22.1
1947	21	22.1
1948	9	22.1
1949	20	22.1
1951	25	20.2
1952	22	20.2
1953	22	20.2
1954	8	20.2
1955	27	20.2
1956	15	20.2
1957	10	20.2
1958	34	20.2
1959	19	20.2
1960	26	26.8
1961	36	26.8
1962	22	26.8
1963	23	26.8
1973	39	31.7
1974	32	31.7
1975	24	31.7

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

First to last qualifying date each year at Cottonwood
Year	First date	Last date
1914	1914-07-11	1914-08-15
1915	1915-07-20	1915-08-29
1916	1916-06-17	1916-09-01
1917	1917-07-08	1917-08-25
1918	1918-06-09	1918-08-25
1919	1919-06-19	1919-08-30
1920	1920-07-02	1920-08-22
1921	1921-07-18	1921-08-30
1922	1922-06-20	1922-09-19
1923	1923-07-22	1923-09-09
1924	1924-06-30	1924-09-13
1925	1925-06-20	1925-08-31
1926	1926-06-07	1926-08-29
1927	1927-07-17	1927-08-19
1928	1928-05-24	1928-09-05
1932	1932-06-21	1932-09-07
1933	1933-06-12	1933-08-28
1934	1934-05-23	1934-10-11
1935	1935-07-12	1935-09-10
1936	1936-05-26	1936-09-21
1937	1937-06-02	1937-09-16
1938	1938-07-07	1938-09-23
1939	1939-05-15	1939-09-21
1940	1940-06-11	1940-09-12
1941	1941-06-22	1941-08-15
1944	1944-07-15	1944-09-12
1945	1945-07-10	1945-09-13
1946	1946-06-13	1946-08-24
1947	1947-07-05	1947-09-22
1948	1948-05-27	1948-09-14
1949	1949-07-09	1949-09-23
1951	1951-07-03	1951-09-15
1952	1952-07-09	1952-09-26
1953	1953-07-09	1953-09-15
1954	1954-05-18	1954-09-10
1955	1955-06-20	1955-09-07
1956	1956-07-09	1956-08-23
1957	1957-06-05	1957-09-06
1958	1958-06-22	1958-09-10
1959	1959-06-19	1959-09-10
1960	1960-06-24	1960-09-12
1961	1961-06-16	1961-08-24
1962	1962-06-24	1962-09-26
1963	1963-07-06	1963-09-29
1973	1973-05-16	1973-09-06
1974	1974-06-16	1974-09-26
1975	1975-06-03	1975-09-06

Every Fixed Threshold

Fixed thresholds at Cottonwood
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	47	47	1934	24
35 C (95 F): Days	30	8	1961	2
40 C (104 F): Days	1	1	1934	1
90 F (32.2 C): Days	45	28	1936	12
100 F (37.8 C): Days	7	2	1928	1
0 C (32 F): Ice days (max	47	63	1917	34
0 C (32 F): Frost days (min	46	190	1954	174
-10 C (14 F): Days with min	46	58	1955	23
-20 C (-4 F): Days with min	31	12	1932	8
-30 C (-22 F): Days with min	4	4	1936	2
20 C (68 F): Tropical nights (min	11	6	1917	1
10 mm (0.39 in): Days with 10 mm or more rain	47	26	1921	21
25 mm (0.98 in): Days with 25 mm or more rain	35	5	1917	2
50 mm (1.97 in): Days with 50 mm or more rain	2	1	1917	1
10 cm (3.9 in): Days with 10 cm or more snowfall	32	12	1921	3
25 cm (9.8 in): Days with 25 cm or more snowfall	7	1	1916	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1914.

Download the Data

Data for Cottonwood 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).

Cottonwood Threshold Days by Year (USC00102154)

Key Facts for Cottonwood Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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