Johnston 4 SW Threshold Days by Year
17 fixed thresholds counted per year at Johnston 4 SW (USC00384607): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Johnston 4 SW Thresholds
- Johnston 4 SW: days with a maximum temperature at or above 30 C (86 F) in 63 years, most in 2010 with 147.
- Johnston 4 SW: days with a maximum temperature at or above 90 F (32.2 C) in 63 years, most in 2010 with 115.
- Johnston 4 SW: days with 10 mm (0.39 in) or more of precipitation in 63 years, most in 2018 with 54.
- Johnston 4 SW: days with 25 mm (0.98 in) or more of precipitation in 63 years, most in 1991 with 22.
- 17 fixed thresholds have at least one qualifying day at Johnston 4 SW.
Days at or above 30 C (86 F)
63 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1958 | 103 | 100 |
| 1959 | 97 | 100 |
| 1960 | 112 | 89.9 |
| 1961 | 86 | 89.9 |
| 1962 | 111 | 89.9 |
| 1963 | 93 | 89.9 |
| 1964 | 80 | 89.9 |
| 1965 | 95 | 89.9 |
| 1967 | 64 | 89.9 |
| 1968 | 89 | 89.9 |
| 1969 | 79 | 89.9 |
| 1970 | 106 | 88 |
| 1971 | 84 | 88 |
| 1972 | 74 | 88 |
| 1973 | 81 | 88 |
| 1974 | 78 | 88 |
| 1975 | 90 | 88 |
| 1976 | 65 | 88 |
| 1977 | 117 | 88 |
| 1978 | 112 | 88 |
| 1979 | 73 | 88 |
| 1980 | 117 | 105.1 |
| 1981 | 109 | 105.1 |
| 1982 | 103 | 105.1 |
| 1983 | 97 | 105.1 |
| 1984 | 106 | 105.1 |
| 1985 | 96 | 105.1 |
| 1986 | 116 | 105.1 |
| 1987 | 112 | 105.1 |
| 1988 | 94 | 105.1 |
| 1989 | 101 | 105.1 |
| 1990 | 107 | 111.4 |
| 1991 | 105 | 111.4 |
| 1992 | 88 | 111.4 |
| 1993 | 129 | 111.4 |
| 1994 | 108 | 111.4 |
| 1995 | 114 | 111.4 |
| 1996 | 118 | 111.4 |
| 1997 | 100 | 111.4 |
| 1998 | 125 | 111.4 |
| 1999 | 120 | 111.4 |
| 2000 | 120 | 112.4 |
| 2001 | 121 | 112.4 |
| 2002 | 134 | 112.4 |
| 2003 | 97 | 112.4 |
| 2004 | 118 | 112.4 |
| 2005 | 111 | 112.4 |
| 2006 | 121 | 112.4 |
| 2008 | 102 | 112.4 |
| 2009 | 88 | 112.4 |
| 2010 | 147 | 121.1 |
| 2011 | 124 | 121.1 |
| 2012 | 107 | 121.1 |
| 2013 | 91 | 121.1 |
| 2014 | 116 | 121.1 |
| 2015 | 115 | 121.1 |
| 2016 | 139 | 121.1 |
| 2017 | 118 | 121.1 |
| 2018 | 133 | 121.1 |
| 2021 | 82 | 86.5 |
| 2022 | 95 | 86.5 |
| 2023 | 78 | 86.5 |
| 2024 | 91 | 86.5 |
| Year | First date | Last date |
|---|---|---|
| 1958 | 1958-04-25 | 1958-11-17 |
| 1959 | 1959-04-09 | 1959-10-10 |
| 1960 | 1960-04-24 | 1960-10-07 |
| 1961 | 1961-05-08 | 1961-11-03 |
| 1962 | 1962-05-01 | 1962-10-17 |
| 1963 | 1963-04-04 | 1963-10-13 |
| 1964 | 1964-04-25 | 1964-09-30 |
| 1965 | 1965-04-10 | 1965-09-24 |
| 1967 | 1967-04-04 | 1967-10-07 |
| 1968 | 1968-04-20 | 1968-10-04 |
| 1969 | 1969-05-07 | 1969-10-15 |
| 1970 | 1970-04-20 | 1970-10-04 |
| 1971 | 1971-04-19 | 1971-10-06 |
| 1972 | 1972-04-16 | 1972-09-30 |
| 1973 | 1973-05-12 | 1973-10-06 |
| 1974 | 1974-03-11 | 1974-11-02 |
| 1975 | 1975-04-29 | 1975-09-21 |
| 1976 | 1976-04-19 | 1976-09-13 |
| 1977 | 1977-04-12 | 1977-09-28 |
| 1978 | 1978-04-06 | 1978-10-28 |
| 1979 | 1979-05-12 | 1979-09-17 |
| 1980 | 1980-04-24 | 1980-10-12 |
| 1981 | 1981-04-13 | 1981-10-07 |
| 1982 | 1982-03-21 | 1982-09-19 |
| 1983 | 1983-05-13 | 1983-10-05 |
| 1984 | 1984-04-27 | 1984-10-31 |
| 1985 | 1985-03-31 | 1985-10-16 |
| 1986 | 1986-04-26 | 1986-10-06 |
| 1987 | 1987-04-23 | 1987-09-30 |
| 1988 | 1988-04-06 | 1988-09-26 |
| 1989 | 1989-04-20 | 1989-10-17 |
| 1990 | 1990-04-25 | 1990-10-10 |
| 1991 | 1991-04-10 | 1991-10-20 |
| 1992 | 1992-04-16 | 1992-09-23 |
| 1993 | 1993-05-07 | 1993-11-17 |
| 1994 | 1994-03-28 | 1994-10-02 |
| 1995 | 1995-03-24 | 1995-10-07 |
| 1996 | 1996-04-21 | 1996-10-29 |
| 1997 | 1997-05-16 | 1997-10-15 |
| 1998 | 1998-05-16 | 1998-10-31 |
| 1999 | 1999-04-04 | 1999-10-04 |
| 2000 | 2000-05-03 | 2000-10-06 |
| 2001 | 2001-04-10 | 2001-10-25 |
| 2002 | 2002-04-17 | 2002-10-13 |
| 2003 | 2003-04-30 | 2003-09-28 |
| 2004 | 2004-04-20 | 2004-10-04 |
| 2005 | 2005-04-22 | 2005-10-08 |
| 2006 | 2006-04-14 | 2006-10-06 |
| 2008 | 2008-05-09 | 2008-09-30 |
| 2009 | 2009-04-25 | 2009-09-26 |
| 2010 | 2010-04-02 | 2010-10-13 |
| 2011 | 2011-04-20 | 2011-09-30 |
| 2012 | 2012-03-16 | 2012-10-07 |
| 2013 | 2013-05-16 | 2013-10-07 |
| 2014 | 2014-04-03 | 2014-10-29 |
| 2015 | 2015-03-18 | 2015-10-01 |
| 2016 | 2016-04-21 | 2016-11-01 |
| 2017 | 2017-03-22 | 2017-10-13 |
| 2018 | 2018-05-04 | 2018-10-17 |
| 2021 | 2021-05-21 | 2021-10-14 |
| 2022 | 2022-05-04 | 2022-09-23 |
| 2023 | 2023-04-05 | 2023-09-26 |
| 2024 | 2024-05-02 | 2024-10-07 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 63 | 147 | 2010 | 91 |
| 35 C (95 F): Days | 61 | 70 | 2010 | 15 |
| 40 C (104 F): Days | 17 | 6 | 1999 | 4 |
| 90 F (32.2 C): Days | 63 | 115 | 2010 | 53 |
| 100 F (37.8 C): Days | 39 | 24 | 1993 | 1 |
| 110 F (43.3 C): Days | 1 | 1 | 2012 | 1 |
| 0 C (32 F): Ice days (max | 36 | 5 | 1968 | 1 |
| 0 C (32 F): Frost days (min | 61 | 89 | 1968 | 39 |
| -10 C (14 F): Days with min | 42 | 8 | 1977 | 2 |
| 20 C (68 F): Tropical nights (min | 61 | 88 | 2022 | 82 |
| 25 C (77 F): Days with min | 2 | 1 | 1958 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 63 | 54 | 2018 | 37 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 63 | 22 | 1991 | 16 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 60 | 9 | 1964 | 4 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 14 | 1 | 1959 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 6 | 2 | 1958 | 1 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 1 | 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 1958.
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 2026-10-13 (13 October 2026). Threshold counts are computed by this site.
Data as of . Last revised (2026-10-12).