Duluth Harbor STN Threshold Days by Year (USC00212246)
15 fixed thresholds counted per year at Duluth Harbor STN (USC00212246): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Duluth Harbor STN Thresholds
- Duluth Harbor STN: days with a maximum temperature at or below 0 C (32 F) in 36 years, most in 1972 with 127.
- Duluth Harbor STN: nights with a minimum temperature at or below 0 C (32 F) in 35 years, most in 2002 with 199.
- Duluth Harbor STN: nights with a minimum temperature at or below -10 C (14 F) in 35 years, most in 1996 with 100.
- Duluth Harbor STN: nights with a minimum temperature at or below -20 C (-4 F) in 35 years, most in 1996 with 47.
- 15 fixed thresholds have at least one qualifying day at Duluth Harbor STN.
Days at or above 30 C (86 F)
28 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1961 | 10 | 6.5 |
| 1963 | 10 | 6.5 |
| 1964 | 9 | 6.5 |
| 1965 | 2 | 6.5 |
| 1966 | 4 | 6.5 |
| 1969 | 4 | 6.5 |
| 1970 | 7 | 3.9 |
| 1971 | 2 | 3.9 |
| 1972 | 2 | 3.9 |
| 1973 | 5 | 3.9 |
| 1974 | 2 | 3.9 |
| 1975 | 5 | 3.9 |
| 1976 | 8 | 3.9 |
| 1977 | 2 | 3.9 |
| 1978 | 2 | 3.9 |
| 1980 | 4 | 5.6 |
| 1981 | 3 | 5.6 |
| 1983 | 13 | 5.6 |
| 1984 | 5 | 5.6 |
| 1986 | 2 | 5.6 |
| 1987 | 8 | 5.6 |
| 1989 | 4 | 5.6 |
| 1992 | 2 | 6 |
| 1997 | 5 | 6 |
| 1999 | 11 | 6 |
| 2001 | 6 | 12 |
| 2002 | 21 | 12 |
| 2003 | 9 | 12 |
| Year | First date | Last date |
|---|---|---|
| 1961 | 1961-06-27 | 1961-08-31 |
| 1963 | 1963-06-25 | 1963-08-06 |
| 1964 | 1964-05-22 | 1964-08-03 |
| 1965 | 1965-08-11 | 1965-08-12 |
| 1966 | 1966-06-28 | 1966-07-12 |
| 1969 | 1969-05-28 | 1969-08-28 |
| 1970 | 1970-06-29 | 1970-08-25 |
| 1971 | 1971-07-06 | 1971-08-09 |
| 1972 | 1972-06-08 | 1972-08-17 |
| 1973 | 1973-07-06 | 1973-09-01 |
| 1974 | 1974-07-07 | 1974-07-18 |
| 1975 | 1975-07-15 | 1975-07-29 |
| 1976 | 1976-06-10 | 1976-09-11 |
| 1977 | 1977-07-13 | 1977-07-14 |
| 1978 | 1978-07-26 | 1978-09-06 |
| 1980 | 1980-05-04 | 1980-07-10 |
| 1981 | 1981-07-06 | 1981-07-08 |
| 1983 | 1983-07-12 | 1983-09-02 |
| 1984 | 1984-07-12 | 1984-08-28 |
| 1986 | 1986-05-29 | 1986-05-30 |
| 1987 | 1987-06-14 | 1987-08-15 |
| 1989 | 1989-07-08 | 1989-08-01 |
| 1992 | 1992-06-11 | 1992-06-12 |
| 1997 | 1997-06-28 | 1997-08-03 |
| 1999 | 1999-05-30 | 1999-08-28 |
| 2001 | 2001-06-27 | 2001-08-08 |
| 2002 | 2002-05-31 | 2002-09-09 |
| 2003 | 2003-07-03 | 2003-08-25 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 28 | 21 | 2002 | 9 |
| 35 C (95 F): Days | 4 | 2 | 2001 | 2 |
| 90 F (32.2 C): Days | 18 | 5 | 1999 | 3 |
| 0 C (32 F): Ice days (max | 36 | 127 | 1972 | 95 |
| 0 C (32 F): Frost days (min | 35 | 199 | 2002 | 187 |
| -10 C (14 F): Days with min | 35 | 100 | 1996 | 88 |
| -20 C (-4 F): Days with min | 35 | 47 | 1996 | 30 |
| -30 C (-22 F): Days with min | 19 | 11 | 1994 | 2 |
| 20 C (68 F): Tropical nights (min | 21 | 13 | 1983 | 2 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 28 | 34 | 1965 | 20 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 28 | 9 | 1966 | 6 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 17 | 3 | 1972 | 1 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 1 | 1 | 1964 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 19 | 7 | 1965 | 1 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 5 | 1 | 1965 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1961.
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).