Boulder City Threshold Days by Year (USC00261071)

17 fixed thresholds counted per year at Boulder City (USC00261071): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Boulder City Thresholds

Boulder City: days with a maximum temperature at or above 30 C (86 F) in 66 years, most in 1934 with 171.
Boulder City: days with a maximum temperature at or above 35 C (95 F) in 66 years, most in 1988 with 112.
Boulder City: days with a maximum temperature at or above 40 C (104 F) in 66 years, most in 1990 with 44.
Boulder City: days with a maximum temperature at or above 90 F (32.2 C) in 66 years, most in 1989 with 149.
17 fixed thresholds have at least one qualifying day at Boulder City.

Days at or above 30 C (86 F)

66 years with a qualifying day

Days per year at Boulder City with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 171 in 1934.

Days at or above 30 C (86 F) per year at Boulder City
Year	Days	Decade average
1932	134	143.3
1933	134	143.3
1934	171	143.3
1935	140	143.3
1936	149	143.3
1937	148	143.3
1938	141	143.3
1939	129	143.3
1940	152	141.1
1941	117	141.1
1942	142	141.1
1943	154	141.1
1944	134	141.1
1945	136	141.1
1946	145	141.1
1947	150	141.1
1948	140	141.1
1949	141	141.1
1950	150	143.7
1951	131	143.7
1952	151	143.7
1953	130	143.7
1954	160	143.7
1955	138	143.7
1956	150	143.7
1957	126	143.7
1958	157	143.7
1959	144	143.7
1960	149	146.6
1961	138	146.6
1962	151	146.6
1963	152	146.6
1964	151	146.6
1965	140	146.6
1966	162	146.6
1967	143	146.6
1968	135	146.6
1969	145	146.6
1970	139	141.5
1971	136	141.5
1972	149	141.5
1973	149	141.5
1974	148	141.5
1975	132	141.5
1977	135	141.5
1978	144	141.5
1980	142	145.9
1981	139	145.9
1982	123	145.9
1983	127	145.9
1984	149	145.9
1985	146	145.9
1986	144	145.9
1987	159	145.9
1988	161	145.9
1989	169	145.9
1990	159	146.6
1991	152	146.6
1992	161	146.6
1993	152	146.6
1994	126	146.6
1995	129	146.6
1996	162	146.6
1997	156	146.6
1998	120	146.6
1999	149	146.6

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

First to last qualifying date each year at Boulder City
Year	First date	Last date
1932	1932-04-12	1932-10-15
1933	1933-04-03	1933-10-24
1934	1934-03-16	1934-11-06
1935	1935-04-14	1935-10-11
1936	1936-04-11	1936-10-14
1937	1937-04-15	1937-10-26
1938	1938-04-18	1938-10-02
1939	1939-04-08	1939-09-24
1940	1940-04-13	1940-10-21
1941	1941-05-05	1941-10-11
1942	1942-05-04	1942-10-22
1943	1943-04-02	1943-10-17
1944	1944-05-05	1944-10-13
1945	1945-04-19	1945-10-10
1946	1946-04-16	1946-09-29
1947	1947-04-14	1947-10-20
1948	1948-04-16	1948-10-10
1949	1949-04-22	1949-10-13
1950	1950-04-02	1950-10-21
1951	1951-04-09	1951-10-19
1952	1952-05-02	1952-10-22
1953	1953-05-18	1953-10-10
1954	1954-04-14	1954-10-22
1955	1955-05-05	1955-10-17
1956	1956-03-24	1956-10-11
1957	1957-05-02	1957-10-01
1958	1958-04-18	1958-10-19
1959	1959-04-02	1959-10-26
1960	1960-04-05	1960-10-08
1961	1961-04-03	1961-10-18
1962	1962-04-07	1962-10-12
1963	1963-05-01	1963-10-16
1964	1964-03-31	1964-10-16
1965	1965-04-20	1965-10-14
1966	1966-03-31	1966-10-11
1967	1967-05-08	1967-10-23
1968	1968-02-25	1968-10-03
1969	1969-03-31	1969-10-03
1970	1970-04-10	1970-10-06
1971	1971-03-30	1971-10-15
1972	1972-03-04	1972-10-01
1973	1973-04-27	1973-10-21
1974	1974-05-02	1974-10-21
1975	1975-05-11	1975-10-20
1977	1977-04-08	1977-10-19
1978	1978-05-12	1978-10-17
1980	1980-04-18	1980-10-13
1981	1981-04-17	1981-10-01
1982	1982-04-28	1982-09-27
1983	1983-05-06	1983-09-26
1984	1984-04-15	1984-10-10
1985	1985-04-07	1985-10-07
1986	1986-03-27	1986-10-09
1987	1987-04-02	1987-10-19
1988	1988-04-06	1988-11-01
1989	1989-03-31	1989-10-19
1990	1990-03-22	1990-10-28
1991	1991-04-05	1991-10-20
1992	1992-04-25	1992-10-21
1993	1993-04-21	1993-10-06
1994	1994-04-16	1994-10-02
1995	1995-04-25	1995-10-19
1996	1996-04-08	1996-10-16
1997	1997-03-20	1997-10-07
1998	1998-03-23	1998-10-14
1999	1999-04-18	1999-10-16

Every Fixed Threshold

Fixed thresholds at Boulder City
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	66	171	1934	149
35 C (95 F): Days	66	112	1988	93
40 C (104 F): Days	66	44	1990	17
45 C (113 F): Days	7	5	1985	2
90 F (32.2 C): Days	66	149	1989	135
100 F (37.8 C): Days	66	82	1996	58
110 F (43.3 C): Days	43	15	1985	3
0 C (32 F): Ice days (max	7	6	1937	3
0 C (32 F): Frost days (min	63	49	1949	5
-10 C (14 F): Days with min	4	2	1937	1
20 C (68 F): Tropical nights (min	66	140	1996	127
25 C (77 F): Days with min	66	81	1996	69
10 mm (0.39 in): Days with 10 mm or more rain	62	10	1980	2
25 mm (0.98 in): Days with 25 mm or more rain	24	3	1992	2
50 mm (1.97 in): Days with 50 mm or more rain	3	2	1984	1
10 cm (3.9 in): Days with 10 cm or more snowfall	3	3	1949	3
25 cm (9.8 in): Days with 25 cm or more snowfall	1	1	1949	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1932.

Download the Data

Data for Boulder City 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).

Boulder City Threshold Days by Year (USC00261071)

Key Facts for Boulder City Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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