Aurora Threshold Days by Year (USC00250445)
19 fixed thresholds counted per year at Aurora (USC00250445): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Aurora Thresholds
- Aurora: days with 10 mm (0.39 in) or more of precipitation in 85 years, most in 1908 with 37.
- Aurora: days with 25 mm (0.98 in) or more of precipitation in 84 years, most in 1997 with 13.
- Aurora: days with 50 mm (1.97 in) or more of precipitation in 57 years, most in 1968 with 5.
- Aurora: days with 10 cm (3.9 in) or more of snowfall in 56 years, most in 1923 with 5.
- 19 fixed thresholds have at least one qualifying day at Aurora.
Days at or above 30 C (86 F)
51 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1902 | 40 | 61.5 |
| 1906 | 81 | 61.5 |
| 1908 | 65 | 61.5 |
| 1909 | 60 | 61.5 |
| 1910 | 78 | 93 |
| 1911 | 108 | 93 |
| 1942 | 51 | 67.5 |
| 1943 | 84 | 67.5 |
| 1964 | 76 | 71.3 |
| 1965 | 57 | 71.3 |
| 1966 | 85 | 71.3 |
| 1967 | 65 | 71.3 |
| 1968 | 78 | 71.3 |
| 1969 | 67 | 71.3 |
| 1970 | 95 | 70.5 |
| 1971 | 85 | 70.5 |
| 1972 | 78 | 70.5 |
| 1973 | 70 | 70.5 |
| 1974 | 68 | 70.5 |
| 1975 | 66 | 70.5 |
| 1976 | 67 | 70.5 |
| 1977 | 48 | 70.5 |
| 1978 | 67 | 70.5 |
| 1979 | 61 | 70.5 |
| 1980 | 81 | 61.3 |
| 1981 | 57 | 61.3 |
| 1982 | 41 | 61.3 |
| 1983 | 76 | 61.3 |
| 1984 | 62 | 61.3 |
| 1985 | 50 | 61.3 |
| 1986 | 53 | 61.3 |
| 1987 | 69 | 61.3 |
| 1988 | 77 | 61.3 |
| 1989 | 47 | 61.3 |
| 1990 | 49 | 49.6 |
| 1991 | 67 | 49.6 |
| 1992 | 22 | 49.6 |
| 1993 | 35 | 49.6 |
| 1994 | 62 | 49.6 |
| 1995 | 63 | 49.6 |
| 1996 | 43 | 49.6 |
| 1997 | 49 | 49.6 |
| 1998 | 64 | 49.6 |
| 1999 | 42 | 49.6 |
| 2000 | 62 | 59.7 |
| 2001 | 62 | 59.7 |
| 2002 | 72 | 59.7 |
| 2003 | 63 | 59.7 |
| 2004 | 40 | 59.7 |
| 2005 | 65 | 59.7 |
| 2007 | 54 | 59.7 |
| Year | First date | Last date |
|---|---|---|
| 1902 | 1902-04-21 | 1902-09-08 |
| 1906 | 1906-05-16 | 1906-10-13 |
| 1908 | 1908-04-13 | 1908-10-16 |
| 1909 | 1909-04-28 | 1909-10-04 |
| 1910 | 1910-03-21 | 1910-10-15 |
| 1911 | 1911-05-09 | 1911-09-29 |
| 1942 | 1942-04-29 | 1942-10-01 |
| 1943 | 1943-03-30 | 1943-10-10 |
| 1964 | 1964-04-16 | 1964-09-10 |
| 1965 | 1965-04-29 | 1965-08-29 |
| 1966 | 1966-05-04 | 1966-10-13 |
| 1967 | 1967-03-23 | 1967-10-03 |
| 1968 | 1968-03-30 | 1968-09-22 |
| 1969 | 1969-05-26 | 1969-10-04 |
| 1970 | 1970-04-28 | 1970-09-21 |
| 1971 | 1971-06-05 | 1971-10-01 |
| 1972 | 1972-04-06 | 1972-09-20 |
| 1973 | 1973-05-18 | 1973-09-03 |
| 1974 | 1974-05-27 | 1974-09-27 |
| 1975 | 1975-05-18 | 1975-10-23 |
| 1976 | 1976-05-20 | 1976-10-02 |
| 1977 | 1977-05-17 | 1977-09-09 |
| 1978 | 1978-04-01 | 1978-10-21 |
| 1979 | 1979-05-29 | 1979-10-01 |
| 1980 | 1980-04-21 | 1980-10-10 |
| 1981 | 1981-04-26 | 1981-09-30 |
| 1982 | 1982-06-07 | 1982-09-30 |
| 1983 | 1983-05-25 | 1983-09-27 |
| 1984 | 1984-06-01 | 1984-09-24 |
| 1985 | 1985-04-16 | 1985-09-19 |
| 1986 | 1986-03-29 | 1986-09-29 |
| 1987 | 1987-04-20 | 1987-10-05 |
| 1988 | 1988-04-09 | 1988-09-27 |
| 1989 | 1989-04-21 | 1989-10-14 |
| 1990 | 1990-04-23 | 1990-10-06 |
| 1991 | 1991-04-06 | 1991-09-30 |
| 1992 | 1992-04-15 | 1992-10-03 |
| 1993 | 1993-05-28 | 1993-10-07 |
| 1994 | 1994-04-18 | 1994-10-02 |
| 1995 | 1995-06-07 | 1995-10-13 |
| 1996 | 1996-04-12 | 1996-09-11 |
| 1997 | 1997-05-17 | 1997-10-07 |
| 1998 | 1998-05-14 | 1998-09-27 |
| 1999 | 1999-06-05 | 1999-09-25 |
| 2000 | 2000-05-23 | 2000-10-02 |
| 2001 | 2001-05-02 | 2001-10-03 |
| 2002 | 2002-04-15 | 2002-10-03 |
| 2003 | 2003-04-01 | 2003-10-22 |
| 2004 | 2004-04-17 | 2004-09-20 |
| 2005 | 2005-05-11 | 2005-10-19 |
| 2007 | 2007-05-12 | 2007-10-07 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 51 | 108 | 1911 | 54 |
| 35 C (95 F): Days | 50 | 46 | 1911 | 7 |
| 40 C (104 F): Days | 10 | 4 | 1964 | 1 |
| 90 F (32.2 C): Days | 51 | 76 | 1911 | 29 |
| 100 F (37.8 C): Days | 32 | 14 | 1911 | 1 |
| 110 F (43.3 C): Days | 1 | 1 | 1943 | 1 |
| 0 C (32 F): Ice days (max | 51 | 76 | 1978 | 48 |
| 0 C (32 F): Frost days (min | 49 | 160 | 1984 | 128 |
| -10 C (14 F): Days with min | 49 | 75 | 1978 | 46 |
| -20 C (-4 F): Days with min | 47 | 29 | 1979 | 5 |
| -30 C (-22 F): Days with min | 1 | 2 | 1989 | 2 |
| 20 C (68 F): Tropical nights (min | 49 | 44 | 1943 | 35 |
| 25 C (77 F): Days with min | 9 | 14 | 1909 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 85 | 37 | 1908 | 32 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 84 | 13 | 1997 | 12 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 57 | 5 | 1968 | 3 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 5 | 1 | 1950 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 56 | 5 | 1923 | 1 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 8 | 2 | 1968 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1902.
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).