Waterloo 6SW Threshold Days by Year
17 fixed thresholds counted per year at Waterloo 6SW (USC00119002): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Waterloo 6SW Thresholds
- Waterloo 6SW: days with 10 mm (0.39 in) or more of precipitation in 96 years, most in 1982 with 44.
- Waterloo 6SW: days with 25 mm (0.98 in) or more of precipitation in 96 years, most in 1984 with 17.
- Waterloo 6SW: days with 50 mm (1.97 in) or more of precipitation in 76 years, most in 1916 with 5.
- Waterloo 6SW: days with 10 cm (3.9 in) or more of snowfall in 52 years, most in 1912 with 4.
- 17 fixed thresholds have at least one qualifying day at Waterloo 6SW.
Days at or above 30 C (86 F)
37 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1947 | 68 | 68 |
| 1962 | 103 | 83.5 |
| 1963 | 96 | 83.5 |
| 1964 | 97 | 83.5 |
| 1965 | 82 | 83.5 |
| 1966 | 76 | 83.5 |
| 1967 | 60 | 83.5 |
| 1968 | 78 | 83.5 |
| 1969 | 76 | 83.5 |
| 1970 | 81 | 72.2 |
| 1971 | 96 | 72.2 |
| 1972 | 78 | 72.2 |
| 1973 | 63 | 72.2 |
| 1974 | 56 | 72.2 |
| 1975 | 66 | 72.2 |
| 1976 | 61 | 72.2 |
| 1977 | 79 | 72.2 |
| 1978 | 74 | 72.2 |
| 1979 | 68 | 72.2 |
| 1980 | 98 | 77.3 |
| 1981 | 72 | 77.3 |
| 1982 | 47 | 77.3 |
| 1983 | 89 | 77.3 |
| 1984 | 73 | 77.3 |
| 1985 | 64 | 77.3 |
| 1986 | 81 | 77.3 |
| 1987 | 98 | 77.3 |
| 1988 | 87 | 77.3 |
| 1989 | 64 | 77.3 |
| 1990 | 61 | 61.9 |
| 1991 | 77 | 61.9 |
| 1992 | 40 | 61.9 |
| 1995 | 65 | 61.9 |
| 1996 | 50 | 61.9 |
| 1997 | 62 | 61.9 |
| 1998 | 75 | 61.9 |
| 1999 | 65 | 61.9 |
| Year | First date | Last date |
|---|---|---|
| 1947 | 1947-05-15 | 1947-10-15 |
| 1962 | 1962-05-08 | 1962-10-14 |
| 1963 | 1963-04-21 | 1963-10-26 |
| 1964 | 1964-04-16 | 1964-10-17 |
| 1965 | 1965-04-11 | 1965-09-19 |
| 1966 | 1966-05-05 | 1966-09-06 |
| 1967 | 1967-04-05 | 1967-10-04 |
| 1968 | 1968-05-01 | 1968-09-23 |
| 1969 | 1969-05-28 | 1969-10-04 |
| 1970 | 1970-04-28 | 1970-09-25 |
| 1971 | 1971-04-12 | 1971-10-29 |
| 1972 | 1972-04-13 | 1972-09-21 |
| 1973 | 1973-06-09 | 1973-10-03 |
| 1974 | 1974-05-19 | 1974-08-27 |
| 1975 | 1975-05-20 | 1975-10-22 |
| 1976 | 1976-06-12 | 1976-10-05 |
| 1977 | 1977-04-16 | 1977-09-27 |
| 1978 | 1978-05-25 | 1978-09-28 |
| 1979 | 1979-05-09 | 1979-10-22 |
| 1980 | 1980-04-23 | 1980-10-09 |
| 1981 | 1981-04-01 | 1981-10-01 |
| 1982 | 1982-05-06 | 1982-09-13 |
| 1983 | 1983-06-10 | 1983-10-04 |
| 1984 | 1984-04-28 | 1984-09-25 |
| 1985 | 1985-03-29 | 1985-09-23 |
| 1986 | 1986-03-30 | 1986-09-30 |
| 1987 | 1987-04-21 | 1987-11-03 |
| 1988 | 1988-04-06 | 1988-09-23 |
| 1989 | 1989-04-25 | 1989-10-16 |
| 1990 | 1990-04-24 | 1990-09-29 |
| 1991 | 1991-05-15 | 1991-09-16 |
| 1992 | 1992-05-01 | 1992-09-16 |
| 1995 | 1995-06-06 | 1995-09-15 |
| 1996 | 1996-05-10 | 1996-09-07 |
| 1997 | 1997-03-22 | 1997-10-08 |
| 1998 | 1998-05-14 | 1998-09-30 |
| 1999 | 1999-06-05 | 1999-09-29 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 37 | 103 | 1962 | 65 |
| 35 C (95 F): Days | 36 | 39 | 1980 | 12 |
| 40 C (104 F): Days | 4 | 5 | 1966 | 4 |
| 90 F (32.2 C): Days | 37 | 73 | 1987 | 40 |
| 100 F (37.8 C): Days | 16 | 15 | 1988 | 4 |
| 0 C (32 F): Ice days (max | 37 | 49 | 1978 | 14 |
| 0 C (32 F): Frost days (min | 37 | 117 | 1969 | 84 |
| -10 C (14 F): Days with min | 37 | 40 | 1963 | 12 |
| -20 C (-4 F): Days with min | 22 | 8 | 1977 | 3 |
| 20 C (68 F): Tropical nights (min | 37 | 86 | 1947 | 49 |
| 25 C (77 F): Days with min | 20 | 38 | 1947 | 5 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 96 | 44 | 1982 | 26 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 96 | 17 | 1984 | 7 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 76 | 5 | 1916 | 4 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 11 | 1 | 1915 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 52 | 4 | 1912 | 1 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 2 | 1 | 1973 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1947.
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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.
Data as of . Last revised (2026-10-12).