East Helena Threshold Days by Year (USC00242634)

17 fixed thresholds counted per year at East Helena (USC00242634): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for East Helena Thresholds

East Helena: days with a maximum temperature at or above 30 C (86 F) in 33 years, most in 1936 with 58.
East Helena: days with a maximum temperature at or above 90 F (32.2 C) in 33 years, most in 1936 with 41.
East Helena: days with a maximum temperature at or below 0 C (32 F) in 33 years, most in 1955 with 82.
East Helena: nights with a minimum temperature at or below 0 C (32 F) in 32 years, most in 1951 with 195.
17 fixed thresholds have at least one qualifying day at East Helena.

Days at or above 30 C (86 F)

33 years with a qualifying day

Days per year at East Helena with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 58 in 1936.

Days at or above 30 C (86 F) per year at East Helena
Year	Days	Decade average
1925	33	31
1926	28	31
1927	19	31
1928	25	31
1929	50	31
1930	40	46.1
1931	50	46.1
1932	38	46.1
1933	53	46.1
1934	44	46.1
1935	33	46.1
1936	58	46.1
1937	51	46.1
1938	45	46.1
1939	49	46.1
1940	52	31
1941	27	31
1942	33	31
1943	29	31
1944	14	31
1945	39	31
1946	28	31
1947	34	31
1948	18	31
1949	36	31
1950	28	32.8
1951	24	32.8
1952	30	32.8
1953	45	32.8
1954	34	32.8
1955	39	32.8
1956	36	32.8
1957	26	32.8

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

First to last qualifying date each year at East Helena
Year	First date	Last date
1925	1925-06-20	1925-09-05
1926	1926-06-05	1926-08-30
1927	1927-06-26	1927-09-07
1928	1928-05-23	1928-09-04
1929	1929-05-23	1929-09-02
1930	1930-06-08	1930-09-05
1931	1931-05-14	1931-09-07
1932	1932-06-22	1932-09-11
1933	1933-05-31	1933-09-18
1934	1934-05-16	1934-09-07
1935	1935-06-22	1935-09-15
1936	1936-05-14	1936-09-22
1937	1937-05-23	1937-09-19
1938	1938-06-05	1938-09-30
1939	1939-04-30	1939-09-11
1940	1940-05-11	1940-09-12
1941	1941-05-11	1941-08-23
1942	1942-06-30	1942-09-09
1943	1943-07-06	1943-09-12
1944	1944-05-16	1944-09-08
1945	1945-06-21	1945-09-13
1946	1946-06-03	1946-09-14
1947	1947-05-02	1947-09-04
1948	1948-05-17	1948-09-15
1949	1949-05-12	1949-09-24
1950	1950-06-30	1950-09-07
1951	1951-06-16	1951-09-08
1952	1952-06-06	1952-09-27
1953	1953-06-12	1953-09-16
1954	1954-05-19	1954-09-12
1955	1955-06-21	1955-09-08
1956	1956-06-01	1956-09-27
1957	1957-06-06	1957-09-08

Every Fixed Threshold

Fixed thresholds at East Helena
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	33	58	1936	26
35 C (95 F): Days	30	20	1936	3
40 C (104 F): Days	3	1	1931	1
90 F (32.2 C): Days	33	41	1936	16
100 F (37.8 C): Days	12	5	1936	3
0 C (32 F): Ice days (max	33	82	1955	49
0 C (32 F): Frost days (min	32	195	1951	186
-10 C (14 F): Days with min	32	89	1955	61
-20 C (-4 F): Days with min	32	42	1949	26
-30 C (-22 F): Days with min	26	13	1950	5
-40 C (-40 F): Days with min	3	3	1936	1
20 C (68 F): Tropical nights (min	8	3	1936	1
10 mm (0.39 in): Days with 10 mm or more rain	26	9	1948	8
25 mm (0.98 in): Days with 25 mm or more rain	12	3	1947	1
50 mm (1.97 in): Days with 50 mm or more rain	2	2	1947	2
10 cm (3.9 in): Days with 10 cm or more snowfall	19	8	1936	4
25 cm (9.8 in): Days with 25 cm or more snowfall	2	1	1936	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1925.

Download the Data

Data for East Helena 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).

East Helena Threshold Days by Year (USC00242634)

Key Facts for East Helena Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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