Dahlgren Weapons Lab Threshold Days by Year (USW00013760)
16 fixed thresholds counted per year at Dahlgren Weapons Lab (USW00013760): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Dahlgren Weapons Lab Thresholds
- Dahlgren Weapons Lab: nights with a minimum temperature at or below 0 C (32 F) in 36 years, most in 1926 with 110.
- Dahlgren Weapons Lab: nights with a minimum temperature at or above 20 C (68 F) in 36 years, most in 1933 with 75.
- Dahlgren Weapons Lab: days with a maximum temperature at or above 30 C (86 F) in 35 years, most in 1930 with 77.
- Dahlgren Weapons Lab: days with a maximum temperature at or above 90 F (32.2 C) in 35 years, most in 1943 with 52.
- 16 fixed thresholds have at least one qualifying day at Dahlgren Weapons Lab.
Days at or above 30 C (86 F)
35 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1921 | 62 | 50.9 |
| 1922 | 45 | 50.9 |
| 1923 | 41 | 50.9 |
| 1924 | 37 | 50.9 |
| 1925 | 71 | 50.9 |
| 1926 | 56 | 50.9 |
| 1928 | 45 | 50.9 |
| 1929 | 50 | 50.9 |
| 1930 | 77 | 50.3 |
| 1932 | 47 | 50.3 |
| 1933 | 55 | 50.3 |
| 1934 | 41 | 50.3 |
| 1935 | 28 | 50.3 |
| 1937 | 47 | 50.3 |
| 1938 | 52 | 50.3 |
| 1939 | 55 | 50.3 |
| 1940 | 38 | 52 |
| 1941 | 68 | 52 |
| 1942 | 56 | 52 |
| 1943 | 75 | 52 |
| 1944 | 56 | 52 |
| 1945 | 50 | 52 |
| 1946 | 37 | 52 |
| 1947 | 45 | 52 |
| 1948 | 50 | 52 |
| 1949 | 45 | 52 |
| 1950 | 41 | 56.4 |
| 1951 | 38 | 56.4 |
| 1952 | 64 | 56.4 |
| 1953 | 60 | 56.4 |
| 1954 | 70 | 56.4 |
| 1955 | 59 | 56.4 |
| 1956 | 57 | 56.4 |
| 1957 | 71 | 56.4 |
| 1958 | 48 | 56.4 |
| Year | First date | Last date |
|---|---|---|
| 1921 | 1921-03-21 | 1921-09-30 |
| 1922 | 1922-04-08 | 1922-10-06 |
| 1923 | 1923-06-02 | 1923-09-04 |
| 1924 | 1924-06-06 | 1924-09-13 |
| 1925 | 1925-04-15 | 1925-09-28 |
| 1926 | 1926-04-22 | 1926-10-05 |
| 1928 | 1928-05-04 | 1928-10-14 |
| 1929 | 1929-04-06 | 1929-09-29 |
| 1930 | 1930-02-25 | 1930-10-17 |
| 1932 | 1932-05-16 | 1932-09-20 |
| 1933 | 1933-05-14 | 1933-10-01 |
| 1934 | 1934-05-06 | 1934-09-27 |
| 1935 | 1935-04-27 | 1935-09-21 |
| 1937 | 1937-04-18 | 1937-09-05 |
| 1938 | 1938-04-28 | 1938-10-19 |
| 1939 | 1939-04-24 | 1939-10-10 |
| 1940 | 1940-05-07 | 1940-09-21 |
| 1941 | 1941-04-14 | 1941-10-08 |
| 1942 | 1942-04-06 | 1942-09-16 |
| 1943 | 1943-05-06 | 1943-09-16 |
| 1944 | 1944-05-04 | 1944-09-21 |
| 1945 | 1945-03-17 | 1945-09-29 |
| 1946 | 1946-04-23 | 1946-09-10 |
| 1947 | 1947-05-13 | 1947-10-23 |
| 1948 | 1948-03-21 | 1948-09-20 |
| 1949 | 1949-05-19 | 1949-10-11 |
| 1950 | 1950-05-06 | 1950-09-11 |
| 1951 | 1951-05-02 | 1951-10-06 |
| 1952 | 1952-04-20 | 1952-10-02 |
| 1953 | 1953-04-25 | 1953-09-30 |
| 1954 | 1954-04-23 | 1954-10-13 |
| 1955 | 1955-05-05 | 1955-09-20 |
| 1956 | 1956-04-28 | 1956-09-17 |
| 1957 | 1957-04-21 | 1957-09-22 |
| 1958 | 1958-05-04 | 1958-10-10 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 35 | 77 | 1930 | 48 |
| 35 C (95 F): Days | 33 | 21 | 1930 | 1 |
| 40 C (104 F): Days | 1 | 3 | 1930 | 3 |
| 90 F (32.2 C): Days | 35 | 52 | 1943 | 24 |
| 100 F (37.8 C): Days | 7 | 9 | 1930 | 3 |
| 0 C (32 F): Ice days (max | 35 | 21 | 1958 | 21 |
| 0 C (32 F): Frost days (min | 36 | 110 | 1926 | 87 |
| -10 C (14 F): Days with min | 26 | 10 | 1930 | 9 |
| 20 C (68 F): Tropical nights (min | 36 | 75 | 1933 | 50 |
| 25 C (77 F): Days with min | 23 | 4 | 1943 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 25 | 47 | 1948 | 44 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 25 | 16 | 1958 | 16 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 19 | 8 | 1948 | 4 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 3 | 1 | 1950 | 1 |
| 200 mm (7.87 in): Days with 200 mm or more rain | 1 | 1 | 1950 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 7 | 3 | 1958 | 3 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1921.
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 2026-10-17 (17 October 2026). Threshold counts are computed by this site.
Data as of . Last revised (2025-12-31).