Deadwood Dam Threshold Days by Year

16 fixed thresholds counted per year at Deadwood Dam (USC00102385): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Deadwood Dam Thresholds

Deadwood Dam: days with a maximum temperature at or above 30 C (86 F) in 44 years, most in 1940 with 50.
Deadwood Dam: days with a maximum temperature at or below 0 C (32 F) in 44 years, most in 1936 with 73.
Deadwood Dam: days with 10 mm (0.39 in) or more of precipitation in 44 years, most in 1970 with 50.
Deadwood Dam: days with 25 mm (0.98 in) or more of precipitation in 44 years, most in 1933 with 10.
16 fixed thresholds have at least one qualifying day at Deadwood Dam.

Days at or above 30 C (86 F)

44 years with a qualifying day

Days per year at Deadwood Dam with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 50 in 1940.

Days at or above 30 C (86 F) per year at Deadwood Dam
Year	Days	Decade average
1930	27	26
1931	35	26
1932	25	26
1933	34	26
1934	6	26
1935	21	26
1936	30	26
1937	27	26
1938	17	26
1939	38	26
1940	50	23.5
1941	22	23.5
1942	41	23.5
1943	24	23.5
1944	13	23.5
1945	15	23.5
1946	21	23.5
1947	21	23.5
1948	10	23.5
1949	18	23.5
1950	17	22.8
1951	23	22.8
1952	15	22.8
1953	25	22.8
1954	25	22.8
1955	39	22.8
1956	21	22.8
1957	23	22.8
1958	14	22.8
1959	26	22.8
1960	26	28.8
1961	42	28.8
1962	11	28.8
1963	10	28.8
1964	19	28.8
1965	17	28.8
1966	45	28.8
1967	42	28.8
1968	33	28.8
1969	43	28.8
1970	36	31.8
1971	36	31.8
1972	18	31.8
1973	37	31.8

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

First to last qualifying date each year at Deadwood Dam
Year	First date	Last date
1930	1930-06-15	1930-09-03
1931	1931-06-07	1931-09-05
1932	1932-06-27	1932-09-07
1933	1933-06-14	1933-09-03
1934	1934-07-27	1934-08-15
1935	1935-07-13	1935-08-28
1936	1936-05-27	1936-09-01
1937	1937-06-29	1937-09-19
1938	1938-07-13	1938-09-22
1939	1939-06-29	1939-09-22
1940	1940-05-11	1940-08-31
1941	1941-06-23	1941-08-17
1942	1942-07-03	1942-09-06
1943	1943-07-07	1943-09-17
1944	1944-07-01	1944-09-13
1945	1945-06-22	1945-09-02
1946	1946-07-12	1946-08-23
1947	1947-07-06	1947-09-01
1948	1948-06-29	1948-09-13
1949	1949-07-09	1949-09-23
1950	1950-06-30	1950-09-05
1951	1951-07-03	1951-09-16
1952	1952-07-09	1952-09-26
1953	1953-07-07	1953-09-14
1954	1954-05-19	1954-09-01
1955	1955-06-20	1955-09-11
1956	1956-07-09	1956-09-17
1957	1957-06-04	1957-09-15
1958	1958-07-23	1958-09-10
1959	1959-06-12	1959-09-10
1960	1960-07-08	1960-09-12
1961	1961-06-16	1961-08-28
1962	1962-06-25	1962-09-18
1963	1963-08-05	1963-09-06
1964	1964-07-07	1964-08-18
1965	1965-07-14	1965-08-12
1966	1966-05-26	1966-09-23
1967	1967-07-02	1967-09-21
1968	1968-06-19	1968-09-11
1969	1969-07-18	1969-09-09
1970	1970-06-22	1970-08-31
1971	1971-07-14	1971-09-10
1972	1972-07-26	1972-08-29
1973	1973-06-22	1973-09-06

Every Fixed Threshold

Fixed thresholds at Deadwood Dam
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	44	50	1940	37
35 C (95 F): Days	23	9	1969	2
90 F (32.2 C): Days	43	24	1933	11
100 F (37.8 C): Days	2	1	1960	1
0 C (32 F): Ice days (max	44	73	1936	43
0 C (32 F): Frost days (min	43	316	1945	244
-10 C (14 F): Days with min	43	132	1937	75
-20 C (-4 F): Days with min	43	46	1932	14
-30 C (-22 F): Days with min	39	14	1949	1
-40 C (-40 F): Days with min	2	3	1937	2
10 mm (0.39 in): Days with 10 mm or more rain	44	50	1970	23
25 mm (0.98 in): Days with 25 mm or more rain	44	10	1933	2
50 mm (1.97 in): Days with 50 mm or more rain	12	4	1931	1
10 cm (3.9 in): Days with 10 cm or more snowfall	44	31	1964	15
25 cm (9.8 in): Days with 25 cm or more snowfall	38	8	1933	1
50 cm (19.7 in): Days with 50 cm or more snowfall	6	1	1933	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1930.

Download the Data

Data for Deadwood Dam 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).

Deadwood Dam Threshold Days by Year

Key Facts for Deadwood Dam Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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