Boone Threshold Days by Year (USC00310977)

14 fixed thresholds counted per year at Boone (USC00310977): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Boone Thresholds

Boone: days with a maximum temperature at or below 0 C (32 F) in 50 years, most in 1977 with 33.
Boone: nights with a minimum temperature at or below 0 C (32 F) in 50 years, most in 1930 with 141.
Boone: nights with a minimum temperature at or below -10 C (14 F) in 50 years, most in 1960 with 37.
Boone: days with 10 mm (0.39 in) or more of precipitation in 47 years, most in 1949 with 61.
14 fixed thresholds have at least one qualifying day at Boone.

Days at or above 30 C (86 F)

33 years with a qualifying day

Days per year at Boone with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 30 in 1941.

Days at or above 30 C (86 F) per year at Boone
Year	Days	Decade average
1929	2	2
1931	12	10.9
1932	14	10.9
1933	6	10.9
1934	10	10.9
1935	6	10.9
1936	26	10.9
1937	5	10.9
1938	12	10.9
1939	7	10.9
1940	5	6.8
1941	30	6.8
1942	6	6.8
1943	3	6.8
1944	3	6.8
1945	2	6.8
1948	1	6.8
1949	4	6.8
1951	4	7.3
1952	17	7.3
1953	8	7.3
1954	17	7.3
1956	2	7.3
1957	1	7.3
1959	2	7.3
1962	1	3.5
1964	2	3.5
1966	2	3.5
1968	9	3.5
1970	3	4
1973	1	4
1977	6	4
1978	6	4

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

First to last qualifying date each year at Boone
Year	First date	Last date
1929	1929-06-23	1929-07-07
1931	1931-06-20	1931-09-23
1932	1932-07-14	1932-09-02
1933	1933-06-07	1933-07-23
1934	1934-06-25	1934-08-13
1935	1935-06-18	1935-08-11
1936	1936-06-03	1936-08-27
1937	1937-07-11	1937-09-05
1938	1938-07-11	1938-09-08
1939	1939-06-22	1939-09-28
1940	1940-07-26	1940-08-26
1941	1941-05-21	1941-10-06
1942	1942-04-26	1942-08-02
1943	1943-06-04	1943-06-18
1944	1944-06-17	1944-06-19
1945	1945-06-29	1945-06-30
1948	1948-07-05	1948-07-05
1949	1949-07-23	1949-07-29
1951	1951-07-22	1951-08-31
1952	1952-06-05	1952-07-29
1953	1953-06-21	1953-08-15
1954	1954-06-25	1954-09-19
1956	1956-06-15	1956-08-17
1957	1957-08-03	1957-08-03
1959	1959-06-30	1959-07-02
1962	1962-05-18	1962-05-18
1964	1964-06-21	1964-06-22
1966	1966-07-11	1966-07-14
1968	1968-06-30	1968-08-24
1970	1970-07-03	1970-07-29
1973	1973-07-09	1973-07-09
1977	1977-07-06	1977-07-21
1978	1978-06-28	1978-09-09

Every Fixed Threshold

Fixed thresholds at Boone
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	33	30	1941	6
35 C (95 F): Days	1	1	1936	1
90 F (32.2 C): Days	9	7	1952	4
0 C (32 F): Ice days (max	50	33	1977	20
0 C (32 F): Frost days (min	50	141	1930	115
-10 C (14 F): Days with min	50	37	1960	22
-20 C (-4 F): Days with min	19	5	1970	1
20 C (68 F): Tropical nights (min	23	22	1939	1
10 mm (0.39 in): Days with 10 mm or more rain	47	61	1949	53
25 mm (0.98 in): Days with 25 mm or more rain	47	27	1979	27
50 mm (1.97 in): Days with 50 mm or more rain	46	12	1979	12
100 mm (3.94 in): Days with 100 mm or more rain	12	2	1966	2
10 cm (3.9 in): Days with 10 cm or more snowfall	43	9	1960	4
25 cm (9.8 in): Days with 25 cm or more snowfall	9	3	1960	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1929.

Download the Data

Data for Boone 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).

Boone Threshold Days by Year (USC00310977)

Key Facts for Boone Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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