Rosthern Threshold Days by Year (CA004056920)

16 fixed thresholds counted per year at Rosthern (CA004056920): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Rosthern Thresholds

Rosthern: days with a maximum temperature at or above 30 C (86 F) in 43 years, most in 1936 with 27.
Rosthern: days with a maximum temperature at or below 0 C (32 F) in 43 years, most in 1935 with 147.
Rosthern: nights with a minimum temperature at or below 0 C (32 F) in 43 years, most in 1918 with 223.
Rosthern: nights with a minimum temperature at or below -10 C (14 F) in 43 years, most in 1935 with 152.
16 fixed thresholds have at least one qualifying day at Rosthern.

Days at or above 30 C (86 F)

43 years with a qualifying day

Days per year at Rosthern with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 27 in 1936.

Days at or above 30 C (86 F) per year at Rosthern
Year	Days	Decade average
1911	1	8.2
1912	4	8.2
1913	1	8.2
1914	14	8.2
1915	8	8.2
1916	2	8.2
1917	7	8.2
1918	13	8.2
1919	24	8.2
1920	19	11.6
1921	6	11.6
1922	17	11.6
1923	8	11.6
1924	9	11.6
1925	13	11.6
1926	14	11.6
1927	5	11.6
1928	11	11.6
1929	14	11.6
1930	8	15.3
1931	15	15.3
1932	9	15.3
1933	13	15.3
1934	12	15.3
1935	8	15.3
1936	27	15.3
1937	25	15.3
1938	18	15.3
1939	18	15.3
1955	16	11.2
1956	8	11.2
1957	9	11.2
1958	10	11.2
1959	13	11.2
1960	14	12
1962	8	12
1963	9	12
1964	12	12
1965	14	12
1966	13	12
1967	23	12
1968	6	12
1969	9	12

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

First to last qualifying date each year at Rosthern
Year	First date	Last date
1911	1911-07-07	1911-07-07
1912	1912-06-23	1912-06-28
1913	1913-06-11	1913-06-11
1914	1914-07-04	1914-08-04
1915	1915-08-07	1915-08-31
1916	1916-07-16	1916-07-17
1917	1917-05-15	1917-08-17
1918	1918-06-10	1918-08-08
1919	1919-05-22	1919-08-18
1920	1920-07-10	1920-08-25
1921	1921-07-19	1921-08-31
1922	1922-05-25	1922-09-27
1923	1923-06-11	1923-07-22
1924	1924-07-01	1924-09-05
1925	1925-05-21	1925-08-14
1926	1926-06-26	1926-08-24
1927	1927-07-24	1927-09-06
1928	1928-05-21	1928-08-11
1929	1929-06-16	1929-08-29
1930	1930-06-07	1930-08-24
1931	1931-05-13	1931-08-21
1932	1932-06-14	1932-08-19
1933	1933-06-15	1933-08-29
1934	1934-05-25	1934-09-07
1935	1935-07-15	1935-08-23
1936	1936-05-26	1936-08-31
1937	1937-06-14	1937-08-23
1938	1938-05-27	1938-09-04
1939	1939-04-29	1939-08-28
1955	1955-06-14	1955-09-02
1956	1956-06-01	1956-08-13
1957	1957-07-09	1957-07-29
1958	1958-05-12	1958-08-17
1959	1959-05-16	1959-08-07
1960	1960-05-12	1960-09-04
1962	1962-06-25	1962-08-17
1963	1963-05-24	1963-08-19
1964	1964-05-17	1964-08-08
1965	1965-06-10	1965-08-23
1966	1966-06-28	1966-09-17
1967	1967-06-02	1967-09-06
1968	1968-06-19	1968-07-12
1969	1969-07-10	1969-09-13

Every Fixed Threshold

Fixed thresholds at Rosthern
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	43	27	1936	9
35 C (95 F): Days	18	4	1919	1
90 F (32.2 C): Days	37	15	1919	3
100 F (37.8 C): Days	3	2	1919	1
0 C (32 F): Ice days (max	43	147	1935	132
0 C (32 F): Frost days (min	43	223	1918	206
-10 C (14 F): Days with min	43	152	1935	123
-20 C (-4 F): Days with min	43	90	1936	62
-30 C (-22 F): Days with min	43	44	1917	29
-40 C (-40 F): Days with min	33	8	1917	7
20 C (68 F): Tropical nights (min	1	1	1935	1
10 mm (0.39 in): Days with 10 mm or more rain	35	17	1911	8
25 mm (0.98 in): Days with 25 mm or more rain	29	5	1927	4
50 mm (1.97 in): Days with 50 mm or more rain	5	1	1924	1
10 cm (3.9 in): Days with 10 cm or more snowfall	30	7	1911	2
25 cm (9.8 in): Days with 25 cm or more snowfall	4	2	1930	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1911.

Download the Data

Data for Rosthern 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Rosthern Threshold Days by Year (CA004056920)

Key Facts for Rosthern Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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