Annapolis US Naval Aca Threshold Days by Year (USC00180185)

18 fixed thresholds counted per year at Annapolis US Naval Aca (USC00180185): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Annapolis US Naval Aca Thresholds

Annapolis US Naval Aca: days with a maximum temperature at or above 30 C (86 F) in 64 years, most in 1911 with 80.
Annapolis US Naval Aca: days with a maximum temperature at or above 90 F (32.2 C) in 64 years, most in 1900 with 49.
Annapolis US Naval Aca: days with a maximum temperature at or below 0 C (32 F) in 64 years, most in 1904 with 32.
Annapolis US Naval Aca: days with 10 mm (0.39 in) or more of precipitation in 54 years, most in 1907 with 63.
18 fixed thresholds have at least one qualifying day at Annapolis US Naval Aca.

Days at or above 30 C (86 F)

64 years with a qualifying day

Days per year at Annapolis US Naval Aca with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 80 in 1911.

Days at or above 30 C (86 F) per year at Annapolis US Naval Aca
Year	Days	Decade average
1898	68	63
1899	58	63
1900	74	43.6
1901	70	43.6
1902	48	43.6
1903	28	43.6
1904	37	43.6
1905	46	43.6
1906	46	43.6
1907	18	43.6
1908	34	43.6
1909	35	43.6
1910	14	48.4
1911	80	48.4
1912	51	48.4
1913	61	48.4
1914	64	48.4
1915	47	48.4
1916	31	48.4
1917	40	48.4
1918	48	48.4
1921	45	42.8
1922	46	42.8
1923	47	42.8
1924	27	42.8
1925	66	42.8
1926	42	42.8
1927	41	42.8
1928	36	42.8
1929	35	42.8
1930	60	51.8
1931	52	51.8
1932	53	51.8
1933	66	51.8
1934	49	51.8
1935	40	51.8
1936	48	51.8
1937	44	51.8
1938	46	51.8
1939	60	51.8
1940	37	29.1
1942	21	29.1
1943	52	29.1
1944	33	29.1
1945	23	29.1
1946	16	29.1
1947	19	29.1
1948	27	29.1
1949	34	29.1
1950	16	35
1951	26	35
1952	41	35
1953	41	35
1954	28	35
1955	44	35
1956	28	35
1957	39	35
1958	33	35
1959	54	35
1960	23	34.5
1961	46	34.5
1971	46	38.7
1972	30	38.7
1975	40	38.7

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

First to last qualifying date each year at Annapolis US Naval Aca
Year	First date	Last date
1898	1898-05-20	1898-09-18
1899	1899-05-28	1899-09-08
1900	1900-05-08	1900-10-06
1901	1901-06-06	1901-09-16
1902	1902-04-22	1902-09-02
1903	1903-04-30	1903-09-14
1904	1904-05-24	1904-09-12
1905	1905-05-12	1905-10-02
1906	1906-05-13	1906-09-22
1907	1907-06-25	1907-09-21
1908	1908-05-12	1908-09-19
1909	1909-04-19	1909-09-11
1910	1910-06-20	1910-09-09
1911	1911-05-01	1911-09-25
1912	1912-05-24	1912-09-15
1913	1913-05-02	1913-09-20
1914	1914-05-12	1914-09-24
1915	1915-04-25	1915-09-18
1916	1916-06-27	1916-10-09
1917	1917-06-23	1917-09-02
1918	1918-05-07	1918-09-04
1921	1921-03-21	1921-09-30
1922	1922-04-10	1922-10-05
1923	1923-05-29	1923-09-09
1924	1924-06-20	1924-09-13
1925	1925-05-23	1925-09-28
1926	1926-05-18	1926-09-24
1927	1927-04-20	1927-10-02
1928	1928-06-14	1928-10-13
1929	1929-04-06	1929-09-11
1930	1930-05-06	1930-09-25
1931	1931-06-20	1931-09-23
1932	1932-06-06	1932-09-23
1933	1933-05-20	1933-09-28
1934	1934-05-07	1934-09-27
1935	1935-05-29	1935-09-21
1936	1936-04-21	1936-09-13
1937	1937-05-22	1937-09-04
1938	1938-04-20	1938-09-24
1939	1939-03-25	1939-10-10
1940	1940-05-14	1940-09-21
1942	1942-05-30	1942-09-17
1943	1943-05-07	1943-09-16
1944	1944-05-22	1944-09-06
1945	1945-06-11	1945-08-29
1946	1946-06-08	1946-09-10
1947	1947-06-06	1947-09-04
1948	1948-06-12	1948-09-20
1949	1949-05-19	1949-08-27
1950	1950-06-24	1950-09-01
1951	1951-05-02	1951-10-06
1952	1952-06-06	1952-09-14
1953	1953-05-26	1953-09-04
1954	1954-06-13	1954-10-04
1955	1955-05-05	1955-09-20
1956	1956-05-13	1956-09-17
1957	1957-04-21	1957-09-15
1958	1958-06-01	1958-09-18
1959	1959-05-07	1959-09-28
1960	1960-04-15	1960-09-01
1961	1961-04-25	1961-09-25
1971	1971-06-07	1971-09-10
1972	1972-04-19	1972-09-17
1975	1975-06-18	1975-10-15

Every Fixed Threshold

Fixed thresholds at Annapolis US Naval Aca
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	64	80	1911	40
35 C (95 F): Days	50	17	1901	3
40 C (104 F): Days	3	1	1901	1
90 F (32.2 C): Days	64	49	1900	15
100 F (37.8 C): Days	13	7	1901	1
0 C (32 F): Ice days (max	64	32	1904	4
0 C (32 F): Frost days (min	53	113	1904	63
-10 C (14 F): Days with min	44	18	1912	4
-20 C (-4 F): Days with min	2	2	1899	1
20 C (68 F): Tropical nights (min	53	96	1959	64
25 C (77 F): Days with min	41	17	1898	5
10 mm (0.39 in): Days with 10 mm or more rain	54	63	1907	39
25 mm (0.98 in): Days with 25 mm or more rain	54	23	1901	11
50 mm (1.97 in): Days with 50 mm or more rain	46	5	1901	1
100 mm (3.94 in): Days with 100 mm or more rain	9	2	1928	1
200 mm (7.87 in): Days with 200 mm or more rain	1	1	1928	1
10 cm (3.9 in): Days with 10 cm or more snowfall	11	4	1960	1
25 cm (9.8 in): Days with 25 cm or more snowfall	2	1	1958	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1898.

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Data for Annapolis US Naval Aca 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).

Annapolis US Naval Aca Threshold Days by Year (USC00180185)

Key Facts for Annapolis US Naval Aca Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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