Polson Threshold Days by Year (USC00246635)

16 fixed thresholds counted per year at Polson (USC00246635): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Polson Thresholds

Polson: days with 10 mm (0.39 in) or more of precipitation in 86 years, most in 2010 with 18.
Polson: days with a maximum temperature at or above 30 C (86 F) in 83 years, most in 2003 with 45.
Polson: days with a maximum temperature at or below 0 C (32 F) in 83 years, most in 1916 with 71.
Polson: nights with a minimum temperature at or below 0 C (32 F) in 83 years, most in 1916 with 178.
16 fixed thresholds have at least one qualifying day at Polson.

Days at or above 30 C (86 F)

83 years with a qualifying day

Days per year at Polson with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 45 in 2003.

Days at or above 30 C (86 F) per year at Polson
Year	Days	Decade average
1909	14	14
1911	7	22.5
1912	9	22.5
1914	43	22.5
1915	25	22.5
1916	6	22.5
1917	43	22.5
1918	9	22.5
1919	38	22.5
1920	34	24.5
1921	34	24.5
1926	29	24.5
1927	9	24.5
1928	14	24.5
1929	27	24.5
1930	23	27.9
1931	31	27.9
1932	31	27.9
1933	15	27.9
1935	18	27.9
1936	41	27.9
1938	34	27.9
1939	30	27.9
1940	33	19.8
1941	22	19.8
1942	20	19.8
1943	15	19.8
1944	20	19.8
1945	36	19.8
1946	16	19.8
1947	12	19.8
1948	6	19.8
1949	18	19.8
1950	12	16.1
1951	16	16.1
1952	20	16.1
1953	22	16.1
1954	12	16.1
1955	16	16.1
1956	15	16.1
1957	4	16.1
1959	28	16.1
1960	30	23
1961	39	23
1962	17	23
1963	25	23
1964	9	23
1965	18	23
1973	36	23.6
1974	30	23.6
1975	22	23.6
1976	12	23.6
1977	17	23.6
1978	18	23.6
1979	30	23.6
1981	30	29.2
1982	17	29.2
1983	18	29.2
1984	37	29.2
1985	36	29.2
1986	37	29.2
1990	24	22.6
1991	22	22.6
1992	28	22.6
1993	8	22.6
1994	35	22.6
1996	22	22.6
1999	19	22.6
2000	30	28.9
2001	29	28.9
2002	17	28.9
2003	45	28.9
2004	24	28.9
2005	31	28.9
2006	32	28.9
2007	43	28.9
2008	19	28.9
2009	19	28.9
2010	13	20
2011	22	20
2012	21	20
2013	21	20
2014	23	20

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

First to last qualifying date each year at Polson
Year	First date	Last date
1909	1909-07-01	1909-08-21
1911	1911-07-15	1911-09-01
1912	1912-06-20	1912-08-24
1914	1914-06-17	1914-08-28
1915	1915-06-24	1915-08-29
1916	1916-06-16	1916-08-15
1917	1917-06-16	1917-08-29
1918	1918-06-11	1918-08-24
1919	1919-05-22	1919-08-20
1920	1920-07-01	1920-08-16
1921	1921-06-13	1921-08-31
1926	1926-06-04	1926-08-25
1927	1927-06-22	1927-08-11
1928	1928-07-14	1928-09-03
1929	1929-06-28	1929-08-31
1930	1930-06-10	1930-08-29
1931	1931-06-09	1931-09-06
1932	1932-06-14	1932-09-07
1933	1933-06-15	1933-08-11
1935	1935-06-22	1935-09-14
1936	1936-05-10	1936-09-21
1938	1938-06-04	1938-09-21
1939	1939-07-10	1939-09-10
1940	1940-05-10	1940-08-22
1941	1941-06-22	1941-08-22
1942	1942-07-02	1942-08-24
1943	1943-07-07	1943-09-13
1944	1944-06-30	1944-09-09
1945	1945-06-20	1945-09-03
1946	1946-07-11	1946-08-22
1947	1947-07-02	1947-09-04
1948	1948-06-29	1948-09-14
1949	1949-06-10	1949-08-17
1950	1950-06-21	1950-09-04
1951	1951-07-14	1951-08-22
1952	1952-07-04	1952-09-26
1953	1953-07-08	1953-09-15
1954	1954-06-22	1954-08-10
1955	1955-06-21	1955-09-03
1956	1956-07-12	1956-08-23
1957	1957-07-05	1957-09-06
1959	1959-06-20	1959-08-16
1960	1960-06-24	1960-08-19
1961	1961-06-16	1961-08-25
1962	1962-06-30	1962-08-25
1963	1963-06-17	1963-09-06
1964	1964-06-23	1964-08-17
1965	1965-07-06	1965-08-16
1973	1973-05-17	1973-09-11
1974	1974-06-12	1974-08-25
1975	1975-07-02	1975-08-06
1976	1976-06-19	1976-09-05
1977	1977-06-06	1977-08-12
1978	1978-06-05	1978-09-04
1979	1979-06-11	1979-09-16
1981	1981-06-26	1981-09-12
1982	1982-06-21	1982-09-09
1983	1983-05-25	1983-08-31
1984	1984-05-29	1984-09-18
1985	1985-06-19	1985-08-25
1986	1986-05-26	1986-08-27
1990	1990-06-23	1990-08-15
1991	1991-07-04	1991-09-01
1992	1992-06-09	1992-08-19
1993	1993-06-19	1993-08-12
1994	1994-05-10	1994-08-21
1996	1996-07-03	1996-08-31
1999	1999-07-10	1999-08-31
2000	2000-07-13	2000-08-26
2001	2001-07-04	2001-09-05
2002	2002-06-27	2002-08-14
2003	2003-06-18	2003-09-06
2004	2004-06-23	2004-08-22
2005	2005-07-06	2005-08-29
2006	2006-05-18	2006-08-29
2007	2007-06-28	2007-09-03
2008	2008-06-30	2008-08-19
2009	2009-05-30	2009-09-19
2010	2010-06-30	2010-08-27
2011	2011-07-18	2011-09-23
2012	2012-07-09	2012-08-28
2013	2013-07-01	2013-08-19
2014	2014-07-05	2014-09-25

Every Fixed Threshold

Fixed thresholds at Polson
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	83	45	2003	23
35 C (95 F): Days	45	15	2003	1
40 C (104 F): Days	2	1	1919	1
90 F (32.2 C): Days	79	36	2003	7
100 F (37.8 C): Days	10	4	1936	2
0 C (32 F): Ice days (max	83	71	1916	58
0 C (32 F): Frost days (min	83	178	1916	144
-10 C (14 F): Days with min	82	58	1916	36
-20 C (-4 F): Days with min	62	18	1916	8
-30 C (-22 F): Days with min	12	4	1936	1
20 C (68 F): Tropical nights (min	13	5	2003	3
10 mm (0.39 in): Days with 10 mm or more rain	86	18	2010	10
25 mm (0.98 in): Days with 25 mm or more rain	50	5	1951	2
50 mm (1.97 in): Days with 50 mm or more rain	4	1	1916	1
10 cm (3.9 in): Days with 10 cm or more snowfall	21	7	1955	3
25 cm (9.8 in): Days with 25 cm or more snowfall	2	2	2010	2

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1909.

Download the Data

Data for Polson 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).

Polson Threshold Days by Year (USC00246635)

Key Facts for Polson Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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