Helena Wb City Threshold Days by Year (USW00094104)

16 fixed thresholds counted per year at Helena Wb City (USW00094104): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Helena Wb City Thresholds

Helena Wb City: days with a maximum temperature at or above 30 C (86 F) in 49 years, most in 1929 with 47.
Helena Wb City: days with a maximum temperature at or below 0 C (32 F) in 49 years, most in 1897 with 72.
Helena Wb City: nights with a minimum temperature at or below 0 C (32 F) in 49 years, most in 1909 with 184.
Helena Wb City: nights with a minimum temperature at or below -10 C (14 F) in 49 years, most in 1936 with 71.
16 fixed thresholds have at least one qualifying day at Helena Wb City.

Days at or above 30 C (86 F)

49 years with a qualifying day

Days per year at Helena Wb City with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 47 in 1929.

Days at or above 30 C (86 F) per year at Helena Wb City
Year	Days	Decade average
1893	26	20.6
1894	27	20.6
1895	18	20.6
1896	23	20.6
1897	13	20.6
1898	24	20.6
1899	13	20.6
1900	17	17.3
1901	21	17.3
1902	10	17.3
1903	11	17.3
1904	22	17.3
1905	23	17.3
1906	27	17.3
1907	3	17.3
1908	21	17.3
1909	18	17.3
1910	25	22.9
1911	14	22.9
1912	16	22.9
1913	18	22.9
1914	30	22.9
1915	14	22.9
1916	17	22.9
1917	35	22.9
1918	20	22.9
1919	40	22.9
1920	31	25.9
1921	25	25.9
1922	26	25.9
1923	22	25.9
1924	25	25.9
1925	24	25.9
1926	27	25.9
1927	14	25.9
1928	18	25.9
1929	47	25.9
1930	34	32.6
1931	43	32.6
1932	33	32.6
1933	38	32.6
1934	27	32.6
1935	24	32.6
1936	46	32.6
1937	33	32.6
1938	15	32.6
1939	33	32.6
1953	29	27
1954	25	27

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

First to last qualifying date each year at Helena Wb City
Year	First date	Last date
1893	1893-05-16	1893-09-04
1894	1894-06-03	1894-08-27
1895	1895-06-29	1895-08-20
1896	1896-06-16	1896-08-29
1897	1897-06-12	1897-08-24
1898	1898-06-18	1898-09-19
1899	1899-06-17	1899-09-11
1900	1900-06-20	1900-08-01
1901	1901-05-16	1901-08-25
1902	1902-06-08	1902-09-06
1903	1903-07-12	1903-08-20
1904	1904-06-29	1904-09-08
1905	1905-07-09	1905-09-22
1906	1906-07-04	1906-09-07
1907	1907-07-11	1907-08-17
1908	1908-06-25	1908-09-05
1909	1909-07-01	1909-08-26
1910	1910-04-25	1910-08-20
1911	1911-06-22	1911-09-01
1912	1912-06-20	1912-08-26
1913	1913-05-26	1913-09-04
1914	1914-06-01	1914-09-03
1915	1915-07-21	1915-08-31
1916	1916-06-16	1916-09-02
1917	1917-06-16	1917-08-25
1918	1918-06-09	1918-08-26
1919	1919-05-25	1919-09-11
1920	1920-07-01	1920-09-16
1921	1921-06-13	1921-08-31
1922	1922-05-24	1922-09-21
1923	1923-06-12	1923-09-08
1924	1924-06-30	1924-09-04
1925	1925-06-19	1925-09-03
1926	1926-06-06	1926-08-29
1927	1927-06-25	1927-08-06
1928	1928-05-22	1928-08-11
1929	1929-06-28	1929-08-31
1930	1930-06-07	1930-09-03
1931	1931-06-07	1931-09-06
1932	1932-06-22	1932-09-07
1933	1933-05-30	1933-09-05
1934	1934-05-25	1934-08-28
1935	1935-06-22	1935-09-14
1936	1936-05-14	1936-09-21
1937	1937-06-21	1937-09-18
1938	1938-07-14	1938-09-19
1939	1939-07-08	1939-08-27
1953	1953-06-11	1953-09-12
1954	1954-05-19	1954-08-30

Every Fixed Threshold

Fixed thresholds at Helena Wb City
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	49	47	1929	25
35 C (95 F): Days	32	10	1919	3
90 F (32.2 C): Days	48	27	1936	11
100 F (37.8 C): Days	5	3	1893	1
0 C (32 F): Ice days (max	49	72	1897	46
0 C (32 F): Frost days (min	49	184	1909	165
-10 C (14 F): Days with min	49	71	1936	41
-20 C (-4 F): Days with min	47	36	1916	12
-30 C (-22 F): Days with min	29	10	1916	2
-40 C (-40 F): Days with min	1	2	1893	2
20 C (68 F): Tropical nights (min	11	5	1919	4
10 mm (0.39 in): Days with 10 mm or more rain	49	14	1916	10
25 mm (0.98 in): Days with 25 mm or more rain	22	3	1898	3
50 mm (1.97 in): Days with 50 mm or more rain	3	1	1900	1
10 cm (3.9 in): Days with 10 cm or more snowfall	47	8	1903	3
25 cm (9.8 in): Days with 25 cm or more snowfall	8	1	1896	1

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 Helena Wb 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).

Helena Wb City Threshold Days by Year (USW00094104)

Key Facts for Helena Wb City Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

Related