Grantsburg Threshold Days by Year (USC00473242)

18 fixed thresholds counted per year at Grantsburg (USC00473242): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Grantsburg Thresholds

Grantsburg: nights with a minimum temperature at or below 0 C (32 F) in 50 years, most in 1907 with 198.
Grantsburg: nights with a minimum temperature at or below -10 C (14 F) in 50 years, most in 1912 with 106.
Grantsburg: nights with a minimum temperature at or below -20 C (-4 F) in 50 years, most in 1897 with 58.
Grantsburg: days with a maximum temperature at or above 30 C (86 F) in 49 years, most in 1894 with 90.
18 fixed thresholds have at least one qualifying day at Grantsburg.

Days at or above 30 C (86 F)

49 years with a qualifying day

Days per year at Grantsburg with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 90 in 1894.

Days at or above 30 C (86 F) per year at Grantsburg
Year	Days	Decade average
1893	26	40.8
1894	90	40.8
1896	49	40.8
1897	25	40.8
1898	35	40.8
1899	20	40.8
1901	38	24.4
1902	17	24.4
1905	12	24.4
1906	29	24.4
1907	11	24.4
1908	27	24.4
1909	37	24.4
1910	53	31.4
1911	30	31.4
1912	25	31.4
1913	35	31.4
1914	25	31.4
1916	30	31.4
1917	22	31.4
1920	29	29.8
1921	55	29.8
1922	30	29.8
1923	41	29.8
1924	20	29.8
1925	36	29.8
1926	30	29.8
1927	13	29.8
1928	13	29.8
1929	31	29.8
1930	34	36
1931	47	36
1932	33	36
1933	56	36
1934	48	36
1935	30	36
1936	47	36
1938	10	36
1939	19	36
1940	16	25.4
1941	28	25.4
1942	9	25.4
1943	38	25.4
1944	20	25.4
1945	16	25.4
1946	15	25.4
1947	43	25.4
1948	28	25.4
1949	41	25.4

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

First to last qualifying date each year at Grantsburg
Year	First date	Last date
1893	1893-06-12	1893-08-09
1894	1894-05-12	1894-09-28
1896	1896-05-05	1896-08-20
1897	1897-05-05	1897-09-08
1898	1898-06-03	1898-09-29
1899	1899-06-19	1899-08-30
1901	1901-05-17	1901-09-05
1902	1902-05-18	1902-08-28
1905	1905-06-13	1905-08-28
1906	1906-06-13	1906-09-10
1907	1907-06-16	1907-08-31
1908	1908-06-18	1908-09-20
1909	1909-05-05	1909-09-12
1910	1910-06-11	1910-10-15
1911	1911-05-10	1911-09-16
1912	1912-06-22	1912-09-10
1913	1913-04-30	1913-09-06
1914	1914-05-25	1914-09-21
1916	1916-07-05	1916-09-05
1917	1917-05-18	1917-09-16
1920	1920-05-25	1920-09-26
1921	1921-05-20	1921-09-04
1922	1922-05-11	1922-10-04
1923	1923-05-27	1923-09-27
1924	1924-06-13	1924-08-30
1925	1925-05-19	1925-09-17
1926	1926-05-01	1926-09-17
1927	1927-06-28	1927-09-14
1928	1928-05-09	1928-10-10
1929	1929-06-10	1929-09-04
1930	1930-06-02	1930-09-23
1931	1931-05-15	1931-09-20
1932	1932-05-14	1932-08-30
1933	1933-06-01	1933-09-24
1934	1934-04-28	1934-08-19
1935	1935-07-03	1935-09-24
1936	1936-05-16	1936-09-22
1938	1938-06-21	1938-08-19
1939	1939-05-05	1939-09-15
1940	1940-05-12	1940-09-19
1941	1941-05-19	1941-08-30
1942	1942-06-11	1942-08-30
1943	1943-06-18	1943-08-31
1944	1944-05-14	1944-09-17
1945	1945-06-23	1945-09-07
1946	1946-06-27	1946-08-17
1947	1947-06-26	1947-10-21
1948	1948-05-22	1948-09-18
1949	1949-05-03	1949-08-26

Every Fixed Threshold

Fixed thresholds at Grantsburg
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	49	90	1894	41
35 C (95 F): Days	36	29	1894	5
40 C (104 F): Days	4	4	1936	4
90 F (32.2 C): Days	49	65	1894	19
100 F (37.8 C): Days	13	12	1936	1
0 C (32 F): Ice days (max	49	93	1940	78
0 C (32 F): Frost days (min	50	198	1907	146
-10 C (14 F): Days with min	50	106	1912	66
-20 C (-4 F): Days with min	50	58	1897	18
-30 C (-22 F): Days with min	47	26	1936	4
-40 C (-40 F): Days with min	11	5	1936	5
20 C (68 F): Tropical nights (min	47	15	1941	10
25 C (77 F): Days with min	4	3	1931	1
10 mm (0.39 in): Days with 10 mm or more rain	44	40	1905	24
25 mm (0.98 in): Days with 25 mm or more rain	44	12	1905	7
50 mm (1.97 in): Days with 50 mm or more rain	31	5	1907	1
100 mm (3.94 in): Days with 100 mm or more rain	2	1	1941	1
10 cm (3.9 in): Days with 10 cm or more snowfall	12	6	1945	4

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1893.

Download the Data

Data for Grantsburg 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).

Grantsburg Threshold Days by Year (USC00473242)

Key Facts for Grantsburg Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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