Annapolis US Naval Aca Weather Records (USC00180185)
Record envelope, standing records and threshold days for Annapolis US Naval Aca (USC00180185), Maryland, United States, with 83 years of record.
Key Facts for Annapolis US Naval Aca
- Annapolis US Naval Aca (USC00180185) is a weather station in Maryland, United States at 38.98 latitude and -76.48 longitude, 3 m (10 ft) above sea level.
- The station reports from 1894 to 1976, 83 years of record.
- 1,464 records set at Annapolis US Naval Aca still stand.
- Records are tracked for tmax, tmin, prcp, snow: an element needs 30 years of data to be eligible.
- Annapolis US Naval Aca set a daily record high maximum temperature of 30.0 C (86.0 F) on 24 April 1976.
About the Station
- Location: Maryland, United States, 38.98 latitude, -76.48 longitude.
- Elevation: 3 m (10 ft).
- Period of record: 1894 to 1976, 83 years.
- Eligible elements: tmax, tmin, prcp, snow.
Daily Record Envelope and 2026
0 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 25.0 C (77.0 F) | -19.4 C (-2.9 F) | n/a | n/a |
| Feb | 26.1 C (79.0 F) | -21.1 C (-6.0 F) | n/a | n/a |
| Mar | 31.1 C (88.0 F) | -12.2 C (10.0 F) | n/a | n/a |
| Apr | 35.0 C (95.0 F) | -10.6 C (12.9 F) | n/a | n/a |
| May | 36.7 C (98.1 F) | 0.0 C (32.0 F) | n/a | n/a |
| Jun | 39.4 C (102.9 F) | 1.7 C (35.1 F) | n/a | n/a |
| Jul | 40.6 C (105.1 F) | 11.1 C (52.0 F) | n/a | n/a |
| Aug | 41.1 C (106.0 F) | 10.6 C (51.1 F) | n/a | n/a |
| Sep | 37.2 C (99.0 F) | 4.4 C (39.9 F) | n/a | n/a |
| Oct | 33.3 C (91.9 F) | -3.3 C (26.1 F) | n/a | n/a |
| Nov | 29.4 C (84.9 F) | -10.6 C (12.9 F) | n/a | n/a |
| Dec | 22.8 C (73.0 F) | -17.2 C (1.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1894 | 6 |
| 1895 | 29 |
| 1896 | 55 |
| 1897 | 13 |
| 1898 | 37 |
| 1899 | 32 |
| 1900 | 47 |
| 1901 | 26 |
| 1902 | 16 |
| 1903 | 23 |
| 1904 | 26 |
| 1905 | 25 |
| 1906 | 19 |
| 1907 | 29 |
| 1908 | 34 |
| 1909 | 25 |
| 1910 | 23 |
| 1911 | 16 |
| 1912 | 23 |
| 1913 | 29 |
| 1914 | 29 |
| 1915 | 11 |
| 1916 | 11 |
| 1917 | 26 |
| 1918 | 34 |
| 1919 | 4 |
| 1920 | 11 |
| 1921 | 28 |
| 1922 | 18 |
| 1923 | 20 |
| 1924 | 17 |
| 1925 | 25 |
| 1926 | 21 |
| 1927 | 30 |
| 1928 | 20 |
| 1929 | 31 |
| 1930 | 27 |
| 1931 | 12 |
| 1932 | 24 |
| 1933 | 16 |
| 1934 | 22 |
| 1935 | 10 |
| 1936 | 16 |
| 1937 | 12 |
| 1938 | 12 |
| 1939 | 15 |
| 1940 | 24 |
| 1941 | 14 |
| 1942 | 18 |
| 1943 | 17 |
| 1944 | 9 |
| 1945 | 17 |
| 1946 | 6 |
| 1947 | 12 |
| 1948 | 15 |
| 1949 | 9 |
| 1950 | 24 |
| 1951 | 15 |
| 1952 | 11 |
| 1953 | 12 |
| 1954 | 16 |
| 1955 | 14 |
| 1956 | 21 |
| 1957 | 13 |
| 1958 | 11 |
| 1959 | 17 |
| 1960 | 19 |
| 1961 | 15 |
| 1971 | 16 |
| 1972 | 16 |
| 1973 | 21 |
| 1974 | 22 |
| 1975 | 13 |
| 1976 | 12 |
All-Time Record Progression
1 new records| Date | Kind | Detail |
|---|---|---|
| 1928-08-12 | Record daily precipitation | Record daily precipitation 233.7 mm (9.2 in) |
Wettest Day of Each Month
Aug: 233.7 mm (9.2 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 64.0 mm (2.5 in) | 1 January 1976 |
| Feb | 54.4 mm (2.1 in) | 3 February 1973 |
| Mar | 63.5 mm (2.5 in) | 17 March 1972 |
| Apr | 101.6 mm (4.0 in) | 28 April 1928 |
| May | 69.9 mm (2.8 in) | 13 May 1959 |
| Jun | 88.4 mm (3.5 in) | 2 June 1959 |
| Jul | 151.6 mm (6.0 in) | 18 July 1945 |
| Aug | 233.7 mm (9.2 in) | 12 August 1928 |
| Sep | 127.0 mm (5.0 in) | 9 September 1950 |
| Oct | 88.9 mm (3.5 in) | 5 October 1902 |
| Nov | 69.6 mm (2.7 in) | 21 November 1952 |
| Dec | 73.7 mm (2.9 in) | 13 December 1909 |
Period of Record Coverage
1894 to 1976| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1894 | 17 | 5% | No |
| 1895 | 236 | 65% | No |
| 1896 | 320 | 87% | No |
| 1897 | 293 | 80% | No |
| 1898 | 329 | 90% | Yes |
| 1899 | 359 | 98% | Yes |
| 1900 | 358 | 98% | Yes |
| 1901 | 358 | 98% | Yes |
| 1902 | 360 | 99% | Yes |
| 1903 | 364 | 100% | Yes |
| 1904 | 361 | 99% | Yes |
| 1905 | 330 | 90% | Yes |
| 1906 | 360 | 99% | Yes |
| 1907 | 357 | 98% | Yes |
| 1908 | 352 | 96% | Yes |
| 1909 | 360 | 99% | Yes |
| 1910 | 362 | 99% | Yes |
| 1911 | 332 | 91% | Yes |
| 1912 | 364 | 99% | Yes |
| 1913 | 359 | 98% | Yes |
| 1914 | 334 | 92% | Yes |
| 1915 | 364 | 100% | Yes |
| 1916 | 361 | 99% | Yes |
| 1917 | 336 | 92% | Yes |
| 1918 | 330 | 90% | Yes |
| 1919 | 242 | 66% | No |
| 1920 | 181 | 49% | No |
| 1921 | 344 | 94% | Yes |
| 1922 | 365 | 100% | Yes |
| 1923 | 365 | 100% | Yes |
| 1924 | 366 | 100% | Yes |
| 1925 | 364 | 100% | Yes |
| 1926 | 354 | 97% | Yes |
| 1927 | 365 | 100% | Yes |
| 1928 | 366 | 100% | Yes |
| 1929 | 365 | 100% | Yes |
| 1930 | 364 | 100% | Yes |
| 1931 | 334 | 92% | Yes |
| 1932 | 365 | 100% | Yes |
| 1933 | 365 | 100% | Yes |
| 1934 | 333 | 91% | Yes |
| 1935 | 333 | 91% | Yes |
| 1936 | 333 | 91% | Yes |
| 1937 | 342 | 94% | Yes |
| 1938 | 335 | 92% | Yes |
| 1939 | 345 | 95% | Yes |
| 1940 | 346 | 95% | Yes |
| 1941 | 312 | 85% | No |
| 1942 | 350 | 96% | Yes |
| 1943 | 343 | 94% | Yes |
| 1944 | 358 | 98% | Yes |
| 1945 | 356 | 98% | Yes |
| 1946 | 334 | 92% | Yes |
| 1947 | 329 | 90% | Yes |
| 1948 | 363 | 99% | Yes |
| 1949 | 362 | 99% | Yes |
| 1950 | 364 | 100% | Yes |
| 1951 | 365 | 100% | Yes |
| 1952 | 365 | 100% | Yes |
| 1953 | 365 | 100% | Yes |
| 1954 | 359 | 98% | Yes |
| 1955 | 365 | 100% | Yes |
| 1956 | 363 | 99% | Yes |
| 1957 | 359 | 98% | Yes |
| 1958 | 364 | 100% | Yes |
| 1959 | 358 | 98% | Yes |
| 1960 | 360 | 98% | Yes |
| 1961 | 364 | 100% | Yes |
| 1971 | 361 | 99% | Yes |
| 1972 | 347 | 95% | Yes |
| 1973 | 254 | 70% | No |
| 1974 | 320 | 88% | No |
| 1975 | 362 | 99% | Yes |
| 1976 | 102 | 28% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 24 April 1976 | Annapolis US Naval Aca, US | daily high max | 30.0 C (86.0 F) | 0.6 C (1.1 F) | 19 years | 14 of 100 (Routine) |
| 22 April 1976 | Annapolis US Naval Aca, US | daily high min | 19.4 C (66.9 F) | 3.3 C (5.9 F) | 53 years | 30 of 100 (Routine) |
| 21 April 1976 | Annapolis US Naval Aca, US | daily high min | 18.3 C (64.9 F) | 1.6 C (2.9 F) | 35 years | 21 of 100 (Routine) |
| 20 April 1976 | Annapolis US Naval Aca, US | daily high min | 19.4 C (66.9 F) | 2.2 C (4.0 F) | 35 years | 23 of 100 (Routine) |
| 19 April 1976 | Annapolis US Naval Aca, US | daily high max | 31.7 C (89.1 F) | 1.1 C (2.0 F) | 4 years | 11 of 100 (Routine) |
| 18 April 1976 | Annapolis US Naval Aca, US | daily high max | 31.1 C (88.0 F) | 1.7 C (3.1 F) | 79 years | 34 of 100 (Routine) |
| 17 April 1976 | Annapolis US Naval Aca, US | daily high max | 32.2 C (90.0 F) | 5.5 C (9.9 F) | 77 years | 41 of 100 (Notable) |
| 1 April 1976 | Annapolis US Naval Aca, US | daily rain | 30.5 mm (1.2 in) | 7.1 mm (0.28 in) | 35 years | 24 of 100 (Routine) |
| 13 March 1976 | Annapolis US Naval Aca, US | daily high max (Tie) | 22.8 C (73.0 F) | tie | 53 years | 5 of 100 (Routine) |
| 5 March 1976 | Annapolis US Naval Aca, US | daily high max | 27.2 C (81.0 F) | 3.3 C (5.9 F) | 53 years | 28 of 100 (Routine) |
| 2 March 1976 | Annapolis US Naval Aca, US | daily high min (Tie) | 7.2 C (45.0 F) | tie | 74 years | 7 of 100 (Routine) |
| 19 February 1976 | Annapolis US Naval Aca, US | daily high max | 22.8 C (73.0 F) | 1.1 C (2.0 F) | 14 years | 13 of 100 (Routine) |
| 18 February 1976 | Annapolis US Naval Aca, US | daily high max | 24.4 C (75.9 F) | 2.2 C (4.0 F) | 37 years | 22 of 100 (Routine) |
| 18 February 1976 | Annapolis US Naval Aca, US | daily high min | 6.7 C (44.1 F) | 0.6 C (1.1 F) | 28 years | 17 of 100 (Routine) |
| 16 February 1976 | Annapolis US Naval Aca, US | daily high min (Tie) | 8.3 C (46.9 F) | tie | 66 years | 7 of 100 (Routine) |
| 27 January 1976 | Annapolis US Naval Aca, US | daily rain | 26.2 mm (1.0 in) | 4.6 mm (0.18 in) | 2 years | 12 of 100 (Routine) |
| 19 January 1976 | Annapolis US Naval Aca, US | daily low max | -5.6 C (21.9 F) | 0.6 C (1.1 F) | 72 years | 30 of 100 (Routine) |
| 9 January 1976 | Annapolis US Naval Aca, US | daily low min (Tie) | -11.1 C (12.0 F) | tie | 79 years | 7 of 100 (Routine) |
| 1 January 1976 | Annapolis US Naval Aca, US | monthly rain | 64.0 mm (2.5 in) | 2.3 mm (0.09 in) | 60 years | 38 of 100 (Notable) |
| 25 December 1975 | Annapolis US Naval Aca, US | daily low max | -0.6 C (30.9 F) | 0.6 C (1.1 F) | 68 years | 29 of 100 (Routine) |
Climate Trend
47 complete years, 1899 to 1975| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1899 | 13.4 C | +0.05 C |
| 1900 | 14.0 C | +0.67 C |
| 1901 | 13.1 C | -0.21 C |
| 1904 | 11.8 C | -1.51 C |
| 1906 | 13.9 C | +0.55 C |
| 1907 | 11.8 C | -1.55 C |
| 1908 | 12.9 C | -0.47 C |
| 1909 | 12.9 C | -0.40 C |
| 1910 | 12.4 C | -0.96 C |
| 1912 | 13.4 C | +0.04 C |
| 1913 | 14.9 C | +1.53 C |
| 1915 | 13.7 C | +0.33 C |
| 1916 | 13.1 C | -0.23 C |
| 1922 | 13.9 C | +0.52 C |
| 1923 | 13.5 C | +0.15 C |
| 1924 | 12.4 C | -0.97 C |
| 1925 | 13.2 C | -0.11 C |
| 1926 | 12.3 C | -1.04 C |
| 1927 | 13.1 C | -0.19 C |
| 1928 | 13.1 C | -0.20 C |
| 1929 | 13.3 C | -0.01 C |
| 1930 | 13.6 C | +0.31 C |
| 1932 | 13.9 C | +0.58 C |
| 1933 | 13.9 C | +0.52 C |
| 1935 | 13.3 C | -0.08 C |
| 1940 | 12.5 C | -0.86 C |
| 1944 | 13.3 C | -0.08 C |
| 1945 | 13.4 C | +0.10 C |
| 1946 | 13.9 C | +0.56 C |
| 1947 | 13.1 C | -0.23 C |
| 1948 | 13.1 C | -0.25 C |
| 1949 | 14.2 C | +0.88 C |
| 1950 | 12.8 C | -0.49 C |
| 1951 | 13.4 C | +0.08 C |
| 1952 | 13.8 C | +0.50 C |
| 1953 | 14.5 C | +1.18 C |
| 1954 | 13.9 C | +0.52 C |
| 1955 | 13.6 C | +0.30 C |
| 1956 | 13.2 C | -0.09 C |
| 1957 | 13.6 C | +0.31 C |
| 1958 | 12.4 C | -0.93 C |
| 1959 | 14.0 C | +0.69 C |
| 1960 | 13.1 C | -0.26 C |
| 1961 | 13.2 C | -0.10 C |
| 1971 | 13.9 C | +0.53 C |
| 1972 | 13.3 C | -0.07 C |
| 1975 | 13.9 C | +0.56 C |
The fitted trend in annual mean temperature here over 1899 to 1975 is 0.07 C (-0.01 to 0.16) per decade. The interval includes zero, so the trend is not clearly different from zero. In Fahrenheit: 0.13 F (-0.02 to 0.29) per decade. The slope is a straight line fitted to 47 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.07 C (-0.01 to 0.16) per decade | 0.13 F (-0.02 to 0.29) per decade | 1899 to 1975 | 47 | Not clearly different from zero |
| Mean daily maximum | -0.02 C (-0.14 to 0.10) per decade | -0.04 F (-0.26 to 0.18) per decade | 1899 to 1975 | 47 | Not clearly different from zero |
| Mean daily minimum | 0.2 C (0.1 to 0.3) per decade | 0.3 F (0.1 to 0.5) per decade | 1899 to 1975 | 47 | Rise |
A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.
Extremes by Year
1894 to 1976| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 41.1 C (106.0 F) | 1918 | 35.6 C (96.1 F) | 74 |
| Coldest night (TNn) | -21.1 C (-6.0 F) | 1899 | -13.3 C (8.1 F) | 74 |
| Wettest day (Rx1day) | 233.7 mm (9.2 in) | 1928 | 61.0 mm (2.4 in) | 74 |
| Wettest five days (Rx5day) | 280.0 mm (11.0 in) | 1928 | 92.0 mm (3.6 in) | 74 |
| Longest dry spell (CDD) | 32 days | 1974 | 19 days | 74 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1894 | 36.1 C (97.0 F) |
| 1895 | 35.0 C (95.0 F) |
| 1896 | 34.4 C (93.9 F) |
| 1897 | 34.4 C (93.9 F) |
| 1898 | 36.7 C (98.1 F) |
| 1899 | 35.0 C (95.0 F) |
| 1900 | 37.8 C (100.0 F) |
| 1901 | 40.6 C (105.1 F) |
| 1902 | 36.7 C (98.1 F) |
| 1903 | 35.6 C (96.1 F) |
| 1904 | 35.6 C (96.1 F) |
| 1905 | 35.6 C (96.1 F) |
| 1906 | 36.1 C (97.0 F) |
| 1907 | 33.3 C (91.9 F) |
| 1908 | 35.6 C (96.1 F) |
| 1909 | 35.0 C (95.0 F) |
| 1910 | 33.9 C (93.0 F) |
| 1911 | 37.2 C (99.0 F) |
| 1912 | 35.0 C (95.0 F) |
| 1913 | 37.8 C (100.0 F) |
| 1914 | 37.2 C (99.0 F) |
| 1915 | 36.1 C (97.0 F) |
| 1916 | 34.4 C (93.9 F) |
| 1917 | 37.8 C (100.0 F) |
| 1918 | 41.1 C (106.0 F) |
| 1919 | 34.4 C (93.9 F) |
| 1920 | 34.4 C (93.9 F) |
| 1921 | 36.1 C (97.0 F) |
| 1922 | 34.4 C (93.9 F) |
| 1923 | 36.7 C (98.1 F) |
| 1924 | 36.7 C (98.1 F) |
| 1925 | 36.7 C (98.1 F) |
| 1926 | 37.8 C (100.0 F) |
| 1927 | 36.7 C (98.1 F) |
| 1928 | 35.6 C (96.1 F) |
| 1929 | 36.1 C (97.0 F) |
| 1930 | 40.6 C (105.1 F) |
| 1931 | 35.6 C (96.1 F) |
| 1932 | 36.7 C (98.1 F) |
| 1933 | 35.6 C (96.1 F) |
| 1934 | 39.4 C (102.9 F) |
| 1935 | 35.0 C (95.0 F) |
| 1936 | 39.4 C (102.9 F) |
| 1937 | 37.8 C (100.0 F) |
| 1938 | 35.0 C (95.0 F) |
| 1939 | 37.2 C (99.0 F) |
| 1940 | 38.3 C (100.9 F) |
| 1941 | 36.7 C (98.1 F) |
| 1942 | 35.6 C (96.1 F) |
| 1943 | 34.4 C (93.9 F) |
| 1944 | 34.4 C (93.9 F) |
| 1945 | 36.1 C (97.0 F) |
| 1946 | 35.6 C (96.1 F) |
| 1947 | 35.6 C (96.1 F) |
| 1948 | 36.7 C (98.1 F) |
| 1949 | 34.4 C (93.9 F) |
| 1950 | 33.9 C (93.0 F) |
| 1951 | 33.9 C (93.0 F) |
| 1952 | 36.7 C (98.1 F) |
| 1953 | 38.9 C (102.0 F) |
| 1954 | 36.1 C (97.0 F) |
| 1955 | 35.0 C (95.0 F) |
| 1956 | 35.0 C (95.0 F) |
| 1957 | 36.7 C (98.1 F) |
| 1958 | 34.4 C (93.9 F) |
| 1959 | 37.8 C (100.0 F) |
| 1960 | 33.3 C (91.9 F) |
| 1961 | 33.9 C (93.0 F) |
| 1971 | 33.3 C (91.9 F) |
| 1972 | 36.1 C (97.0 F) |
| 1973 | 36.1 C (97.0 F) |
| 1974 | 35.0 C (95.0 F) |
| 1975 | 34.4 C (93.9 F) |
| 1976 | 32.2 C (90.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1894 | 16.7 C (62.1 F) |
| 1895 | -18.3 C (-0.9 F) |
| 1896 | -15.0 C (5.0 F) |
| 1897 | -7.8 C (18.0 F) |
| 1898 | -13.9 C (7.0 F) |
| 1899 | -21.1 C (-6.0 F) |
| 1900 | -15.0 C (5.0 F) |
| 1901 | -12.2 C (10.0 F) |
| 1902 | -11.1 C (12.0 F) |
| 1903 | -17.8 C (0.0 F) |
| 1904 | -16.7 C (1.9 F) |
| 1905 | -16.7 C (1.9 F) |
| 1906 | -12.2 C (10.0 F) |
| 1907 | -14.4 C (6.1 F) |
| 1908 | -12.2 C (10.0 F) |
| 1909 | -12.8 C (9.0 F) |
| 1910 | -13.3 C (8.1 F) |
| 1911 | -9.4 C (15.1 F) |
| 1912 | -19.4 C (-2.9 F) |
| 1913 | -11.1 C (12.0 F) |
| 1914 | -13.9 C (7.0 F) |
| 1915 | -7.2 C (19.0 F) |
| 1916 | -13.9 C (7.0 F) |
| 1917 | -17.2 C (1.0 F) |
| 1918 | -20.0 C (-4.0 F) |
| 1919 | -10.0 C (14.0 F) |
| 1920 | -6.7 C (19.9 F) |
| 1921 | -13.3 C (8.1 F) |
| 1922 | -15.0 C (5.0 F) |
| 1923 | -12.2 C (10.0 F) |
| 1924 | -13.9 C (7.0 F) |
| 1925 | -15.6 C (3.9 F) |
| 1926 | -14.4 C (6.1 F) |
| 1927 | -15.0 C (5.0 F) |
| 1928 | -13.9 C (7.0 F) |
| 1929 | -13.3 C (8.1 F) |
| 1930 | -13.3 C (8.1 F) |
| 1931 | -10.0 C (14.0 F) |
| 1932 | -10.6 C (12.9 F) |
| 1933 | -13.9 C (7.0 F) |
| 1934 | -21.1 C (-6.0 F) |
| 1935 | -15.0 C (5.0 F) |
| 1936 | -16.7 C (1.9 F) |
| 1937 | -8.3 C (17.1 F) |
| 1938 | -8.9 C (16.0 F) |
| 1939 | -8.9 C (16.0 F) |
| 1940 | -13.3 C (8.1 F) |
| 1941 | -7.8 C (18.0 F) |
| 1942 | -15.6 C (3.9 F) |
| 1943 | -14.4 C (6.1 F) |
| 1944 | -9.4 C (15.1 F) |
| 1945 | -12.2 C (10.0 F) |
| 1946 | -10.6 C (12.9 F) |
| 1947 | -13.3 C (8.1 F) |
| 1948 | -14.4 C (6.1 F) |
| 1949 | -7.8 C (18.0 F) |
| 1950 | -9.4 C (15.1 F) |
| 1951 | -11.1 C (12.0 F) |
| 1952 | -10.0 C (14.0 F) |
| 1953 | -7.2 C (19.0 F) |
| 1954 | -9.4 C (15.1 F) |
| 1955 | -13.3 C (8.1 F) |
| 1956 | -6.7 C (19.9 F) |
| 1957 | -17.2 C (1.0 F) |
| 1958 | -15.0 C (5.0 F) |
| 1959 | -13.3 C (8.1 F) |
| 1960 | -12.8 C (9.0 F) |
| 1961 | -16.1 C (3.0 F) |
| 1971 | -13.3 C (8.1 F) |
| 1972 | -18.9 C (-2.0 F) |
| 1973 | -11.7 C (10.9 F) |
| 1974 | -7.8 C (18.0 F) |
| 1975 | -9.4 C (15.1 F) |
| 1976 | -13.3 C (8.1 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1894 | 10.9 mm (0.4 in) |
| 1895 | 52.8 mm (2.1 in) |
| 1896 | 42.4 mm (1.7 in) |
| 1897 | 49.5 mm (1.9 in) |
| 1898 | 48.3 mm (1.9 in) |
| 1899 | 58.4 mm (2.3 in) |
| 1900 | 78.7 mm (3.1 in) |
| 1901 | 83.8 mm (3.3 in) |
| 1902 | 88.9 mm (3.5 in) |
| 1903 | 76.2 mm (3.0 in) |
| 1904 | 103.6 mm (4.1 in) |
| 1905 | 73.4 mm (2.9 in) |
| 1906 | 47.0 mm (1.9 in) |
| 1907 | 96.5 mm (3.8 in) |
| 1908 | 73.7 mm (2.9 in) |
| 1909 | 73.7 mm (2.9 in) |
| 1910 | 71.1 mm (2.8 in) |
| 1911 | 186.7 mm (7.4 in) |
| 1912 | 46.7 mm (1.8 in) |
| 1913 | 50.8 mm (2.0 in) |
| 1914 | 96.8 mm (3.8 in) |
| 1915 | 66.0 mm (2.6 in) |
| 1916 | 63.0 mm (2.5 in) |
| 1917 | 59.7 mm (2.4 in) |
| 1918 | 49.3 mm (1.9 in) |
| 1919 | 63.5 mm (2.5 in) |
| 1920 | 38.1 mm (1.5 in) |
| 1921 | 44.5 mm (1.8 in) |
| 1922 | 61.0 mm (2.4 in) |
| 1923 | 56.4 mm (2.2 in) |
| 1924 | 53.3 mm (2.1 in) |
| 1925 | 61.0 mm (2.4 in) |
| 1926 | 53.1 mm (2.1 in) |
| 1927 | 48.3 mm (1.9 in) |
| 1928 | 233.7 mm (9.2 in) |
| 1929 | 88.9 mm (3.5 in) |
| 1930 | 54.6 mm (2.1 in) |
| 1931 | 85.1 mm (3.4 in) |
| 1932 | 55.9 mm (2.2 in) |
| 1933 | 127.0 mm (5.0 in) |
| 1934 | 84.8 mm (3.3 in) |
| 1935 | 93.2 mm (3.7 in) |
| 1936 | 50.0 mm (2.0 in) |
| 1937 | 63.8 mm (2.5 in) |
| 1938 | 55.9 mm (2.2 in) |
| 1939 | 77.5 mm (3.1 in) |
| 1940 | 59.2 mm (2.3 in) |
| 1941 | 49.8 mm (2.0 in) |
| 1942 | 49.0 mm (1.9 in) |
| 1943 | 60.5 mm (2.4 in) |
| 1944 | 105.9 mm (4.2 in) |
| 1945 | 151.6 mm (6.0 in) |
| 1946 | 35.3 mm (1.4 in) |
| 1947 | 61.0 mm (2.4 in) |
| 1948 | 50.0 mm (2.0 in) |
| 1949 | 48.0 mm (1.9 in) |
| 1950 | 127.0 mm (5.0 in) |
| 1951 | 58.7 mm (2.3 in) |
| 1952 | 72.6 mm (2.9 in) |
| 1953 | 74.9 mm (2.9 in) |
| 1954 | 55.9 mm (2.2 in) |
| 1955 | 123.7 mm (4.9 in) |
| 1956 | 51.1 mm (2.0 in) |
| 1957 | 49.0 mm (1.9 in) |
| 1958 | 84.1 mm (3.3 in) |
| 1959 | 88.4 mm (3.5 in) |
| 1960 | 79.8 mm (3.1 in) |
| 1961 | 41.7 mm (1.6 in) |
| 1971 | 189.2 mm (7.4 in) |
| 1972 | 63.5 mm (2.5 in) |
| 1973 | 54.4 mm (2.1 in) |
| 1974 | 41.4 mm (1.6 in) |
| 1975 | 57.2 mm (2.3 in) |
| 1976 | 64.0 mm (2.5 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1894 | 15.5 mm (0.6 in) |
| 1895 | 85.6 mm (3.4 in) |
| 1896 | 72.6 mm (2.9 in) |
| 1897 | 84.0 mm (3.3 in) |
| 1898 | 61.0 mm (2.4 in) |
| 1899 | 81.3 mm (3.2 in) |
| 1900 | 117.0 mm (4.6 in) |
| 1901 | 99.1 mm (3.9 in) |
| 1902 | 115.6 mm (4.6 in) |
| 1903 | 106.7 mm (4.2 in) |
| 1904 | 148.6 mm (5.9 in) |
| 1905 | 129.3 mm (5.1 in) |
| 1906 | 79.6 mm (3.1 in) |
| 1907 | 68.6 mm (2.7 in) |
| 1908 | 152.4 mm (6.0 in) |
| 1909 | 73.7 mm (2.9 in) |
| 1910 | 167.7 mm (6.6 in) |
| 1911 | 197.6 mm (7.8 in) |
| 1912 | 96.5 mm (3.8 in) |
| 1913 | 93.2 mm (3.7 in) |
| 1914 | 193.6 mm (7.6 in) |
| 1915 | 116.6 mm (4.6 in) |
| 1916 | 66.8 mm (2.6 in) |
| 1917 | 65.3 mm (2.6 in) |
| 1918 | 71.1 mm (2.8 in) |
| 1919 | 97.3 mm (3.8 in) |
| 1920 | 55.1 mm (2.2 in) |
| 1921 | 63.7 mm (2.5 in) |
| 1922 | 89.1 mm (3.5 in) |
| 1923 | 66.8 mm (2.6 in) |
| 1924 | 86.3 mm (3.4 in) |
| 1925 | 78.8 mm (3.1 in) |
| 1926 | 75.3 mm (3.0 in) |
| 1927 | 68.8 mm (2.7 in) |
| 1928 | 280.0 mm (11.0 in) |
| 1929 | 125.5 mm (4.9 in) |
| 1930 | 66.3 mm (2.6 in) |
| 1931 | 119.1 mm (4.7 in) |
| 1932 | 119.4 mm (4.7 in) |
| 1933 | 252.0 mm (9.9 in) |
| 1934 | 119.7 mm (4.7 in) |
| 1935 | 186.7 mm (7.4 in) |
| 1936 | 74.3 mm (2.9 in) |
| 1937 | 169.4 mm (6.7 in) |
| 1938 | 93.7 mm (3.7 in) |
| 1939 | 80.8 mm (3.2 in) |
| 1940 | 74.2 mm (2.9 in) |
| 1941 | 72.9 mm (2.9 in) |
| 1942 | 89.4 mm (3.5 in) |
| 1943 | 92.3 mm (3.6 in) |
| 1944 | 113.8 mm (4.5 in) |
| 1945 | 202.2 mm (8.0 in) |
| 1946 | 60.9 mm (2.4 in) |
| 1947 | 74.9 mm (2.9 in) |
| 1948 | 115.5 mm (4.5 in) |
| 1949 | 67.0 mm (2.6 in) |
| 1950 | 224.0 mm (8.8 in) |
| 1951 | 93.5 mm (3.7 in) |
| 1952 | 128.0 mm (5.0 in) |
| 1953 | 80.2 mm (3.2 in) |
| 1954 | 66.8 mm (2.6 in) |
| 1955 | 170.5 mm (6.7 in) |
| 1956 | 103.9 mm (4.1 in) |
| 1957 | 61.2 mm (2.4 in) |
| 1958 | 113.1 mm (4.5 in) |
| 1959 | 91.7 mm (3.6 in) |
| 1960 | 116.4 mm (4.6 in) |
| 1961 | 81.7 mm (3.2 in) |
| 1971 | 222.5 mm (8.8 in) |
| 1972 | 91.0 mm (3.6 in) |
| 1973 | 110.1 mm (4.3 in) |
| 1974 | 60.1 mm (2.4 in) |
| 1975 | 122.3 mm (4.8 in) |
| 1976 | 83.9 mm (3.3 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1894 | 21 days |
| 1895 | 13 days |
| 1896 | 23 days |
| 1897 | 18 days |
| 1898 | 25 days |
| 1899 | 17 days |
| 1900 | 17 days |
| 1901 | 28 days |
| 1902 | 17 days |
| 1903 | 22 days |
| 1904 | 16 days |
| 1905 | 14 days |
| 1906 | 19 days |
| 1907 | 15 days |
| 1908 | 26 days |
| 1909 | 16 days |
| 1910 | 22 days |
| 1911 | 15 days |
| 1912 | 20 days |
| 1913 | 19 days |
| 1914 | 18 days |
| 1915 | 17 days |
| 1916 | 21 days |
| 1917 | 28 days |
| 1918 | 16 days |
| 1919 | 10 days |
| 1920 | 27 days |
| 1921 | 23 days |
| 1922 | 24 days |
| 1923 | 17 days |
| 1924 | 27 days |
| 1925 | 24 days |
| 1926 | 18 days |
| 1927 | 14 days |
| 1928 | 23 days |
| 1929 | 11 days |
| 1930 | 28 days |
| 1931 | 19 days |
| 1932 | 16 days |
| 1933 | 12 days |
| 1934 | 19 days |
| 1935 | 10 days |
| 1936 | 22 days |
| 1937 | 20 days |
| 1938 | 16 days |
| 1939 | 24 days |
| 1940 | 22 days |
| 1941 | 27 days |
| 1942 | 23 days |
| 1943 | 29 days |
| 1944 | 25 days |
| 1945 | 21 days |
| 1946 | 21 days |
| 1947 | 15 days |
| 1948 | 18 days |
| 1949 | 18 days |
| 1950 | 15 days |
| 1951 | 13 days |
| 1952 | 22 days |
| 1953 | 18 days |
| 1954 | 25 days |
| 1955 | 27 days |
| 1956 | 20 days |
| 1957 | 14 days |
| 1958 | 18 days |
| 1959 | 25 days |
| 1960 | 20 days |
| 1961 | 18 days |
| 1971 | 15 days |
| 1972 | 12 days |
| 1973 | 14 days |
| 1974 | 32 days |
| 1975 | 13 days |
| 1976 | 19 days |
Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.
Frost Dates and Growing Season
47 years with a frostAcross 47 years with a frost, the median last spring frost at Annapolis US Naval Aca falls on 5 April and the median first autumn frost on 8 November, which leaves a median of 214 days between them.
Fitted over all years, the growing season changes by +4.5 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1926 to 1975) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 5 April | n/a | 30 March | n/a | -1.7 days per decade |
| First autumn frost | 8 November | n/a | 11 November | n/a | +2.8 days per decade |
| Growing days | 214 days | n/a | 227 days | n/a | +4.5 days per decade |
A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.
Rainfall Return Levels
54 years, 1899 to 1975A day with at least 66.1 mm (2.6 in) of rain is expected about once in 2 years. A day with at least 256.0 mm (10.1 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 66.1 mm (2.6 in) | |
| 5 years | 93.4 mm (3.7 in) | |
| 10 years | 118.4 mm (4.7 in) | |
| 25 years | 160.9 mm (6.3 in) | |
| 50 years | 202.9 mm (8.0 in) | |
| 100 years | 256.0 mm (10.1 in) | Longer than the 54 years of record |
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 54 years of values from 1899 to 1975.
A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.
The largest wettest-day totals in the fit: 233.7 mm (9.2 in) in 1928; 189.2 mm (7.4 in) in 1971; 186.7 mm (7.4 in) in 1911.
Station Changes
1 suspectedOne change was suspected in the annual mean temperature of Annapolis US Naval Aca, at 1953. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1953 ran 0.2 C (0.4 F) higher than in the years before (possible change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1953 | +0.2 | +0.4 | possible | 5 |
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
Download the Data
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). Records are computed by this site and are not official.
Data as of . Last revised (2025-12-31).