Alunite Threshold Days by Year

15 fixed thresholds counted per year at Alunite (USC00420113): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Alunite Thresholds

Alunite: nights with a minimum temperature at or below 0 C (32 F) in 33 years, most in 1951 with 205.
Alunite: nights with a minimum temperature at or below -10 C (14 F) in 33 years, most in 1944 with 69.
Alunite: days with a maximum temperature at or above 30 C (86 F) in 30 years, most in 1931 with 81.
Alunite: days with a maximum temperature at or above 90 F (32.2 C) in 30 years, most in 1931 with 50.
15 fixed thresholds have at least one qualifying day at Alunite.

Days at or above 30 C (86 F)

30 years with a qualifying day

Days per year at Alunite with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 81 in 1931.

Days at or above 30 C (86 F) per year at Alunite
Year	Days	Decade average
1918	46	61.5
1919	77	61.5
1920	56	58.4
1921	63	58.4
1922	63	58.4
1924	73	58.4
1925	43	58.4
1926	68	58.4
1927	47	58.4
1928	61	58.4
1929	52	58.4
1931	81	52.9
1932	49	52.9
1933	59	52.9
1934	45	52.9
1935	58	52.9
1936	51	52.9
1937	48	52.9
1938	32	52.9
1940	63	50
1941	29	50
1942	49	50
1943	41	50
1944	70	50
1945	39	50
1946	55	50
1947	49	50
1948	55	50
1950	44	51
1951	58	51

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

First to last qualifying date each year at Alunite
Year	First date	Last date
1918	1918-06-02	1918-09-21
1919	1919-05-17	1919-09-16
1920	1920-06-06	1920-10-06
1921	1921-06-08	1921-10-20
1922	1922-05-24	1922-09-24
1924	1924-06-03	1924-09-29
1925	1925-05-18	1925-08-25
1926	1926-05-22	1926-09-19
1927	1927-05-15	1927-09-20
1928	1928-05-29	1928-09-25
1929	1929-06-14	1929-09-19
1931	1931-05-31	1931-09-17
1932	1932-06-20	1932-09-08
1933	1933-06-10	1933-09-07
1934	1934-05-11	1934-09-03
1935	1935-06-08	1935-09-19
1936	1936-05-14	1936-08-26
1937	1937-06-19	1937-09-18
1938	1938-06-02	1938-08-24
1940	1940-06-12	1940-09-01
1941	1941-06-17	1941-09-06
1942	1942-06-16	1942-10-06
1943	1943-06-18	1943-09-22
1944	1944-06-30	1944-10-09
1945	1945-06-18	1945-09-14
1946	1946-06-03	1946-09-13
1947	1947-05-03	1947-09-28
1948	1948-06-14	1948-09-05
1950	1950-06-06	1950-09-06
1951	1951-05-25	1951-09-05

Every Fixed Threshold

Fixed thresholds at Alunite
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	30	81	1931	58
35 C (95 F): Days	27	19	1931	1
40 C (104 F): Days	2	1	1925	1
90 F (32.2 C): Days	30	50	1931	31
100 F (37.8 C): Days	9	5	1931	2
0 C (32 F): Ice days (max	30	35	1918	18
0 C (32 F): Frost days (min	33	205	1951	205
-10 C (14 F): Days with min	33	69	1944	50
-20 C (-4 F): Days with min	26	13	1937	6
-30 C (-22 F): Days with min	2	3	1937	3
20 C (68 F): Tropical nights (min	4	1	1931	1
10 mm (0.39 in): Days with 10 mm or more rain	22	10	1927	7
25 mm (0.98 in): Days with 25 mm or more rain	8	2	1927	1
10 cm (3.9 in): Days with 10 cm or more snowfall	15	9	1944	1
25 cm (9.8 in): Days with 25 cm or more snowfall	4	2	1934	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1918.

Download the Data

Data for Alunite 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 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Alunite Threshold Days by Year

Key Facts for Alunite Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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