Ontario Ksrv Threshold Days by Year
18 fixed thresholds counted per year at Ontario Ksrv (USC00356294): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Ontario Ksrv Thresholds
- Ontario Ksrv: days with 10 mm (0.39 in) or more of precipitation in 52 years, most in 1970 with 11.
- Ontario Ksrv: days with a maximum temperature at or above 30 C (86 F) in 51 years, most in 1969 with 109.
- Ontario Ksrv: days with a maximum temperature at or above 35 C (95 F) in 51 years, most in 1967 with 72.
- Ontario Ksrv: days with a maximum temperature at or above 90 F (32.2 C) in 51 years, most in 1967 with 94.
- 18 fixed thresholds have at least one qualifying day at Ontario Ksrv.
Days at or above 30 C (86 F)
51 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1946 | 73 | 79 |
| 1948 | 71 | 79 |
| 1949 | 93 | 79 |
| 1950 | 70 | 81.6 |
| 1951 | 67 | 81.6 |
| 1952 | 77 | 81.6 |
| 1953 | 70 | 81.6 |
| 1954 | 60 | 81.6 |
| 1956 | 102 | 81.6 |
| 1957 | 99 | 81.6 |
| 1958 | 100 | 81.6 |
| 1959 | 89 | 81.6 |
| 1960 | 105 | 96.3 |
| 1961 | 100 | 96.3 |
| 1962 | 98 | 96.3 |
| 1963 | 105 | 96.3 |
| 1964 | 77 | 96.3 |
| 1965 | 74 | 96.3 |
| 1966 | 107 | 96.3 |
| 1967 | 107 | 96.3 |
| 1968 | 81 | 96.3 |
| 1969 | 109 | 96.3 |
| 1970 | 95 | 89.3 |
| 1971 | 91 | 89.3 |
| 1972 | 100 | 89.3 |
| 1973 | 101 | 89.3 |
| 1974 | 100 | 89.3 |
| 1975 | 76 | 89.3 |
| 1976 | 69 | 89.3 |
| 1977 | 93 | 89.3 |
| 1978 | 67 | 89.3 |
| 1979 | 101 | 89.3 |
| 1980 | 80 | 77.8 |
| 1981 | 89 | 77.8 |
| 1982 | 74 | 77.8 |
| 1983 | 67 | 77.8 |
| 1984 | 81 | 77.8 |
| 1985 | 76 | 77.8 |
| 1994 | 97 | 80.2 |
| 1995 | 72 | 80.2 |
| 1996 | 73 | 80.2 |
| 1998 | 81 | 80.2 |
| 1999 | 78 | 80.2 |
| 2000 | 59 | 84.7 |
| 2001 | 96 | 84.7 |
| 2002 | 83 | 84.7 |
| 2003 | 100 | 84.7 |
| 2006 | 94 | 84.7 |
| 2007 | 83 | 84.7 |
| 2008 | 78 | 84.7 |
| 2010 | 69 | 69 |
| Year | First date | Last date |
|---|---|---|
| 1946 | 1946-04-25 | 1946-09-30 |
| 1948 | 1948-05-16 | 1948-09-14 |
| 1949 | 1949-05-08 | 1949-09-27 |
| 1950 | 1950-05-22 | 1950-09-07 |
| 1951 | 1951-05-22 | 1951-09-19 |
| 1952 | 1952-04-24 | 1952-09-26 |
| 1953 | 1953-05-06 | 1953-09-19 |
| 1954 | 1954-05-09 | 1954-09-26 |
| 1956 | 1956-04-20 | 1956-09-27 |
| 1957 | 1957-05-27 | 1957-09-30 |
| 1958 | 1958-05-10 | 1958-10-05 |
| 1959 | 1959-05-12 | 1959-09-13 |
| 1960 | 1960-05-10 | 1960-10-05 |
| 1961 | 1961-05-09 | 1961-09-16 |
| 1962 | 1962-04-14 | 1962-09-26 |
| 1963 | 1963-05-17 | 1963-10-03 |
| 1964 | 1964-05-16 | 1964-10-07 |
| 1965 | 1965-05-12 | 1965-10-09 |
| 1966 | 1966-05-02 | 1966-09-24 |
| 1967 | 1967-05-16 | 1967-09-29 |
| 1968 | 1968-04-29 | 1968-09-13 |
| 1969 | 1969-05-06 | 1969-09-28 |
| 1970 | 1970-05-03 | 1970-10-01 |
| 1971 | 1971-05-01 | 1971-10-07 |
| 1972 | 1972-05-13 | 1972-10-02 |
| 1973 | 1973-05-12 | 1973-09-14 |
| 1974 | 1974-05-25 | 1974-09-25 |
| 1975 | 1975-05-14 | 1975-09-17 |
| 1976 | 1976-05-08 | 1976-09-11 |
| 1977 | 1977-04-22 | 1977-09-14 |
| 1978 | 1978-05-14 | 1978-09-26 |
| 1979 | 1979-05-15 | 1979-10-08 |
| 1980 | 1980-05-04 | 1980-09-10 |
| 1981 | 1981-04-30 | 1981-09-19 |
| 1982 | 1982-05-25 | 1982-09-18 |
| 1983 | 1983-05-23 | 1983-09-16 |
| 1984 | 1984-05-29 | 1984-09-20 |
| 1985 | 1985-04-14 | 1985-09-04 |
| 1994 | 1994-04-16 | 1994-09-28 |
| 1995 | 1995-05-28 | 1995-09-18 |
| 1996 | 1996-06-02 | 1996-10-09 |
| 1998 | 1998-05-01 | 1998-09-30 |
| 1999 | 1999-05-23 | 1999-10-07 |
| 2000 | 2000-05-21 | 2000-09-18 |
| 2001 | 2001-05-12 | 2001-10-03 |
| 2002 | 2002-05-19 | 2002-09-16 |
| 2003 | 2003-05-24 | 2003-10-03 |
| 2006 | 2006-05-13 | 2006-09-27 |
| 2007 | 2007-06-01 | 2007-09-16 |
| 2008 | 2008-05-17 | 2008-09-19 |
| 2010 | 2010-06-14 | 2010-10-04 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 51 | 109 | 1969 | 69 |
| 35 C (95 F): Days | 51 | 72 | 1967 | 29 |
| 40 C (104 F): Days | 42 | 26 | 1971 | 2 |
| 45 C (113 F): Days | 2 | 1 | 1961 | 1 |
| 90 F (32.2 C): Days | 51 | 94 | 1967 | 50 |
| 100 F (37.8 C): Days | 51 | 50 | 1961 | 3 |
| 110 F (43.3 C): Days | 11 | 4 | 1961 | 1 |
| 0 C (32 F): Ice days (max | 51 | 60 | 1985 | 16 |
| 0 C (32 F): Frost days (min | 49 | 174 | 1976 | 142 |
| -10 C (14 F): Days with min | 48 | 63 | 1985 | 13 |
| -20 C (-4 F): Days with min | 30 | 24 | 1985 | 4 |
| -30 C (-22 F): Days with min | 4 | 2 | 1962 | 4 |
| 20 C (68 F): Tropical nights (min | 38 | 8 | 1961 | 1 |
| 25 C (77 F): Days with min | 3 | 1 | 1961 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 52 | 11 | 1970 | 10 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 9 | 2 | 1968 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 29 | 4 | 1983 | 4 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 1 | 0 | n/a | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1946.
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).