Helena 6 N Threshold Days by Year (USC00244050)
5 fixed thresholds counted per year at Helena 6 N (USC00244050): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Helena 6 N Thresholds
- Helena 6 N: days with 10 mm (0.39 in) or more of precipitation in 53 years, most in 1941 with 12.
- Helena 6 N: days with 25 mm (0.98 in) or more of precipitation in 22 years, most in 1925 with 2.
- Helena 6 N: days with 10 cm (3.9 in) or more of snowfall in 17 years, most in 1977 with 4.
- Helena 6 N: days with 50 mm (1.97 in) or more of precipitation in 2 years, most in 1933 with 1.
- 5 fixed thresholds have at least one qualifying day at Helena 6 N.
Days with 10 mm (0.39 in) or more of precipitation
53 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1924 | 1 | 4.5 |
| 1925 | 6 | 4.5 |
| 1926 | 8 | 4.5 |
| 1927 | 8 | 4.5 |
| 1928 | 3 | 4.5 |
| 1929 | 1 | 4.5 |
| 1930 | 4 | 3.7 |
| 1931 | 4 | 3.7 |
| 1932 | 3 | 3.7 |
| 1933 | 3 | 3.7 |
| 1934 | 4 | 3.7 |
| 1935 | 1 | 3.7 |
| 1936 | 4 | 3.7 |
| 1937 | 6 | 3.7 |
| 1938 | 3 | 3.7 |
| 1939 | 5 | 3.7 |
| 1940 | 4 | 6.3 |
| 1941 | 12 | 6.3 |
| 1942 | 3 | 6.3 |
| 1943 | 6 | 6.3 |
| 1944 | 6 | 6.3 |
| 1945 | 5 | 6.3 |
| 1946 | 11 | 6.3 |
| 1947 | 5 | 6.3 |
| 1948 | 8 | 6.3 |
| 1949 | 3 | 6.3 |
| 1950 | 8 | 5.7 |
| 1951 | 4 | 5.7 |
| 1952 | 7 | 5.7 |
| 1953 | 6 | 5.7 |
| 1954 | 6 | 5.7 |
| 1955 | 6 | 5.7 |
| 1956 | 3 | 5.7 |
| 1957 | 5 | 5.7 |
| 1958 | 8 | 5.7 |
| 1959 | 4 | 5.7 |
| 1960 | 4 | 6.1 |
| 1962 | 8 | 6.1 |
| 1963 | 7 | 6.1 |
| 1964 | 7 | 6.1 |
| 1965 | 9 | 6.1 |
| 1967 | 5 | 6.1 |
| 1968 | 2 | 6.1 |
| 1969 | 7 | 6.1 |
| 1970 | 1 | 5 |
| 1971 | 8 | 5 |
| 1972 | 2 | 5 |
| 1973 | 2 | 5 |
| 1974 | 5 | 5 |
| 1975 | 12 | 5 |
| 1976 | 4 | 5 |
| 1977 | 5 | 5 |
| 1978 | 6 | 5 |
| Year | First date | Last date |
|---|---|---|
| 1924 | 1924-09-18 | 1924-09-18 |
| 1925 | 1925-04-23 | 1925-09-28 |
| 1926 | 1926-05-09 | 1926-09-10 |
| 1927 | 1927-05-28 | 1927-08-29 |
| 1928 | 1928-06-18 | 1928-08-22 |
| 1929 | 1929-12-10 | 1929-12-10 |
| 1930 | 1930-04-24 | 1930-09-22 |
| 1931 | 1931-05-26 | 1931-07-31 |
| 1932 | 1932-06-05 | 1932-07-19 |
| 1933 | 1933-07-06 | 1933-08-21 |
| 1934 | 1934-06-01 | 1934-06-26 |
| 1935 | 1935-07-05 | 1935-07-05 |
| 1936 | 1936-02-11 | 1936-06-07 |
| 1937 | 1937-04-29 | 1937-12-12 |
| 1938 | 1938-05-01 | 1938-10-15 |
| 1939 | 1939-05-22 | 1939-10-02 |
| 1940 | 1940-04-23 | 1940-09-28 |
| 1941 | 1941-04-11 | 1941-10-04 |
| 1942 | 1942-05-12 | 1942-09-17 |
| 1943 | 1943-01-22 | 1943-09-06 |
| 1944 | 1944-05-18 | 1944-09-02 |
| 1945 | 1945-05-13 | 1945-09-22 |
| 1946 | 1946-04-30 | 1946-12-11 |
| 1947 | 1947-06-01 | 1947-09-16 |
| 1948 | 1948-05-08 | 1948-11-02 |
| 1949 | 1949-04-29 | 1949-09-11 |
| 1950 | 1950-03-06 | 1950-09-14 |
| 1951 | 1951-04-30 | 1951-07-10 |
| 1952 | 1952-03-26 | 1952-08-10 |
| 1953 | 1953-02-28 | 1953-06-03 |
| 1954 | 1954-05-30 | 1954-10-23 |
| 1955 | 1955-04-26 | 1955-12-23 |
| 1956 | 1956-06-16 | 1956-08-07 |
| 1957 | 1957-04-01 | 1957-09-18 |
| 1958 | 1958-05-07 | 1958-08-19 |
| 1959 | 1959-05-28 | 1959-08-20 |
| 1960 | 1960-05-23 | 1960-08-16 |
| 1962 | 1962-05-13 | 1962-10-14 |
| 1963 | 1963-06-03 | 1963-10-05 |
| 1964 | 1964-05-01 | 1964-08-19 |
| 1965 | 1965-03-10 | 1965-09-15 |
| 1967 | 1967-06-06 | 1967-10-05 |
| 1968 | 1968-05-22 | 1968-09-20 |
| 1969 | 1969-01-21 | 1969-07-07 |
| 1970 | 1970-06-28 | 1970-06-28 |
| 1971 | 1971-01-09 | 1971-09-27 |
| 1972 | 1972-06-23 | 1972-08-23 |
| 1973 | 1973-05-25 | 1973-07-01 |
| 1974 | 1974-04-06 | 1974-08-20 |
| 1975 | 1975-04-25 | 1975-10-21 |
| 1976 | 1976-06-05 | 1976-09-18 |
| 1977 | 1977-05-15 | 1977-09-30 |
| 1978 | 1978-05-22 | 1978-09-12 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 10 mm (0.39 in): Days with 10 mm or more rain | 53 | 12 | 1941 | 6 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 22 | 2 | 1925 | 1 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 2 | 1 | 1933 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 17 | 4 | 1977 | 3 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 1 | 1 | 1964 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1924.
Download the Data
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 . Last revised (2025-12-31).