Armstrong Threshold Days by Year (CA001160450)

18 fixed thresholds counted per year at Armstrong (CA001160450): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Armstrong Thresholds

Armstrong: days with 10 mm (0.39 in) or more of precipitation in 62 years, most in 1933 with 19.
Armstrong: days with a maximum temperature at or above 30 C (86 F) in 61 years, most in 1958 with 60.
Armstrong: days with a maximum temperature at or above 90 F (32.2 C) in 61 years, most in 1958 with 39.
Armstrong: days with a maximum temperature at or below 0 C (32 F) in 61 years, most in 1916 with 79.
18 fixed thresholds have at least one qualifying day at Armstrong.

Days at or above 30 C (86 F)

61 years with a qualifying day

Days per year at Armstrong with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 60 in 1958.

Days at or above 30 C (86 F) per year at Armstrong
Year	Days	Decade average
1914	21	17.5
1915	14	17.5
1916	7	17.5
1917	20	17.5
1918	14	17.5
1919	29	17.5
1920	33	25.7
1921	19	25.7
1922	25	25.7
1923	15	25.7
1924	33	25.7
1925	28	25.7
1926	26	25.7
1927	26	25.7
1928	24	25.7
1929	28	25.7
1930	26	30.9
1933	20	30.9
1934	14	30.9
1935	37	30.9
1936	46	30.9
1937	35	30.9
1938	44	30.9
1939	25	30.9
1940	45	32.2
1941	33	32.2
1942	37	32.2
1943	28	32.2
1944	36	32.2
1945	38	32.2
1946	29	32.2
1947	24	32.2
1948	26	32.2
1949	26	32.2
1950	33	27.6
1951	30	27.6
1952	28	27.6
1953	15	27.6
1954	8	27.6
1955	33	27.6
1956	35	27.6
1957	14	27.6
1958	60	27.6
1959	20	27.6
1960	32	26.4
1961	45	26.4
1962	20	26.4
1963	25	26.4
1964	7	26.4
1965	29	26.4
1966	13	26.4
1967	47	26.4
1968	20	26.4
1970	45	29.5
1971	36	29.5
1972	24	29.5
1973	37	29.5
1974	32	29.5
1975	17	29.5
1976	8	29.5
1977	37	29.5

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

First to last qualifying date each year at Armstrong
Year	First date	Last date
1914	1914-06-14	1914-08-15
1915	1915-07-05	1915-08-29
1916	1916-06-15	1916-08-31
1917	1917-06-15	1917-08-28
1918	1918-06-09	1918-08-07
1919	1919-06-19	1919-08-23
1920	1920-06-30	1920-08-22
1921	1921-07-13	1921-08-15
1922	1922-06-01	1922-08-27
1923	1923-06-29	1923-08-18
1924	1924-05-12	1924-09-04
1925	1925-06-20	1925-08-20
1926	1926-06-24	1926-08-25
1927	1927-06-07	1927-08-16
1928	1928-05-20	1928-09-03
1929	1929-05-22	1929-08-28
1930	1930-07-09	1930-08-30
1933	1933-06-13	1933-08-18
1934	1934-05-24	1934-08-28
1935	1935-05-26	1935-09-08
1936	1936-05-18	1936-09-05
1937	1937-06-01	1937-09-17
1938	1938-05-22	1938-09-18
1939	1939-05-13	1939-08-22
1940	1940-05-22	1940-09-11
1941	1941-05-23	1941-08-22
1942	1942-06-26	1942-09-04
1943	1943-06-28	1943-09-12
1944	1944-05-27	1944-09-12
1945	1945-05-29	1945-08-29
1946	1946-06-18	1946-09-02
1947	1947-05-24	1947-08-07
1948	1948-05-25	1948-08-02
1949	1949-05-08	1949-09-07
1950	1950-06-11	1950-09-03
1951	1951-05-22	1951-09-03
1952	1952-07-03	1952-08-21
1953	1953-07-06	1953-08-18
1954	1954-05-18	1954-08-02
1955	1955-06-09	1955-09-08
1956	1956-05-17	1956-09-17
1957	1957-05-29	1957-08-18
1958	1958-05-21	1958-09-07
1959	1959-06-20	1959-08-07
1960	1960-06-23	1960-08-18
1961	1961-05-25	1961-08-23
1962	1962-06-16	1962-09-06
1963	1963-05-20	1963-09-11
1964	1964-07-07	1964-07-28
1965	1965-06-08	1965-08-22
1966	1966-07-22	1966-09-05
1967	1967-06-14	1967-09-21
1968	1968-07-02	1968-08-10
1970	1970-05-16	1970-08-30
1971	1971-06-21	1971-08-29
1972	1972-05-28	1972-08-29
1973	1973-05-14	1973-09-11
1974	1974-06-11	1974-09-03
1975	1975-07-02	1975-08-15
1976	1976-07-15	1976-07-25
1977	1977-04-24	1977-08-22

Every Fixed Threshold

Fixed thresholds at Armstrong
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	61	60	1958	37
35 C (95 F): Days	51	21	1971	6
40 C (104 F): Days	2	1	1940	1
90 F (32.2 C): Days	61	39	1958	22
100 F (37.8 C): Days	18	5	1926	1
0 C (32 F): Ice days (max	61	79	1916	63
0 C (32 F): Frost days (min	61	195	1935	172
-10 C (14 F): Days with min	61	64	1949	27
-20 C (-4 F): Days with min	58	27	1916	2
-30 C (-22 F): Days with min	23	19	1950	3
-40 C (-40 F): Days with min	1	3	1950	3
20 C (68 F): Tropical nights (min	12	5	1919	1
10 mm (0.39 in): Days with 10 mm or more rain	62	19	1933	6
25 mm (0.98 in): Days with 25 mm or more rain	31	5	1964	1
50 mm (1.97 in): Days with 50 mm or more rain	1	1	1956	1
10 cm (3.9 in): Days with 10 cm or more snowfall	61	11	1937	3
25 cm (9.8 in): Days with 25 cm or more snowfall	11	2	1937	1
50 cm (19.7 in): Days with 50 cm or more snowfall	1	1	1956	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 Armstrong 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).

Armstrong Threshold Days by Year (CA001160450)

Key Facts for Armstrong Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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