Rock Is L&D 15 Threshold Days by Year (USC00117391)
18 fixed thresholds counted per year at Rock Is L&D 15 (USC00117391): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Rock Is L&D 15 Thresholds
- Rock Is L&D 15: days with 10 mm (0.39 in) or more of precipitation in 52 years, most in 2019 with 50.
- Rock Is L&D 15: days with 25 mm (0.98 in) or more of precipitation in 52 years, most in 2009 with 18.
- Rock Is L&D 15: days with 50 mm (1.97 in) or more of precipitation in 45 years, most in 1870 with 6.
- Rock Is L&D 15: days with a maximum temperature at or above 30 C (86 F) in 43 years, most in 1873 with 80.
- 18 fixed thresholds have at least one qualifying day at Rock Is L&D 15.
Days at or above 30 C (86 F)
43 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1873 | 80 | 58 |
| 1874 | 72 | 58 |
| 1875 | 37 | 58 |
| 1876 | 43 | 58 |
| 1889 | 25 | 25 |
| 1890 | 49 | 49 |
| 1989 | 30 | 30 |
| 1990 | 36 | 41.9 |
| 1991 | 61 | 41.9 |
| 1992 | 22 | 41.9 |
| 1993 | 33 | 41.9 |
| 1994 | 51 | 41.9 |
| 1995 | 53 | 41.9 |
| 1996 | 30 | 41.9 |
| 1997 | 38 | 41.9 |
| 1998 | 45 | 41.9 |
| 1999 | 50 | 41.9 |
| 2000 | 38 | 40.5 |
| 2001 | 41 | 40.5 |
| 2002 | 53 | 40.5 |
| 2003 | 41 | 40.5 |
| 2004 | 28 | 40.5 |
| 2005 | 66 | 40.5 |
| 2006 | 42 | 40.5 |
| 2007 | 64 | 40.5 |
| 2008 | 21 | 40.5 |
| 2009 | 11 | 40.5 |
| 2010 | 51 | 40.9 |
| 2012 | 59 | 40.9 |
| 2013 | 37 | 40.9 |
| 2014 | 15 | 40.9 |
| 2015 | 27 | 40.9 |
| 2016 | 46 | 40.9 |
| 2017 | 40 | 40.9 |
| 2018 | 51 | 40.9 |
| 2019 | 42 | 40.9 |
| 2020 | 53 | 52.1 |
| 2021 | 55 | 52.1 |
| 2022 | 49 | 52.1 |
| 2023 | 51 | 52.1 |
| 2024 | 49 | 52.1 |
| 2025 | 51 | 52.1 |
| 2026 | 57 | 52.1 |
| Year | First date | Last date |
|---|---|---|
| 1873 | 1873-05-28 | 1873-09-27 |
| 1874 | 1874-05-08 | 1874-09-13 |
| 1875 | 1875-05-20 | 1875-09-09 |
| 1876 | 1876-05-29 | 1876-09-07 |
| 1889 | 1889-06-27 | 1889-09-04 |
| 1890 | 1890-05-29 | 1890-09-06 |
| 1989 | 1989-05-24 | 1989-08-22 |
| 1990 | 1990-04-24 | 1990-10-05 |
| 1991 | 1991-05-12 | 1991-09-15 |
| 1992 | 1992-05-01 | 1992-09-16 |
| 1993 | 1993-05-08 | 1993-09-12 |
| 1994 | 1994-04-25 | 1994-09-30 |
| 1995 | 1995-06-07 | 1995-09-05 |
| 1996 | 1996-05-17 | 1996-08-26 |
| 1997 | 1997-05-18 | 1997-10-07 |
| 1998 | 1998-05-14 | 1998-09-27 |
| 1999 | 1999-05-28 | 1999-10-15 |
| 2000 | 2000-06-01 | 2000-10-19 |
| 2001 | 2001-05-09 | 2001-09-07 |
| 2002 | 2002-04-15 | 2002-09-30 |
| 2003 | 2003-04-14 | 2003-09-11 |
| 2004 | 2004-04-16 | 2004-09-14 |
| 2005 | 2005-06-04 | 2005-10-05 |
| 2006 | 2006-04-13 | 2006-10-03 |
| 2007 | 2007-04-29 | 2007-10-07 |
| 2008 | 2008-06-05 | 2008-09-02 |
| 2009 | 2009-06-18 | 2009-08-10 |
| 2010 | 2010-05-24 | 2010-09-21 |
| 2012 | 2012-05-19 | 2012-09-12 |
| 2013 | 2013-04-30 | 2013-09-19 |
| 2014 | 2014-05-31 | 2014-09-04 |
| 2015 | 2015-06-09 | 2015-09-17 |
| 2016 | 2016-05-23 | 2016-10-17 |
| 2017 | 2017-05-15 | 2017-09-25 |
| 2018 | 2018-05-24 | 2018-10-03 |
| 2019 | 2019-05-16 | 2019-10-02 |
| 2020 | 2020-05-25 | 2020-09-06 |
| 2021 | 2021-06-03 | 2021-09-30 |
| 2022 | 2022-05-09 | 2022-09-20 |
| 2023 | 2023-04-14 | 2023-10-03 |
| 2024 | 2024-04-14 | 2024-10-11 |
| 2025 | 2025-04-28 | 2025-10-05 |
| 2026 | 2026-04-17 | 2026-10-14 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 43 | 80 | 1873 | 57 |
| 35 C (95 F): Days | 31 | 22 | 1874 | 12 |
| 40 C (104 F): Days | 1 | 2 | 1874 | 2 |
| 90 F (32.2 C): Days | 43 | 50 | 1873 | 30 |
| 100 F (37.8 C): Days | 6 | 11 | 1874 | 1 |
| 0 C (32 F): Ice days (max | 43 | 64 | 1875 | 27 |
| 0 C (32 F): Frost days (min | 43 | 163 | 1873 | 59 |
| -10 C (14 F): Days with min | 43 | 66 | 1875 | 26 |
| -20 C (-4 F): Days with min | 38 | 29 | 1875 | 2 |
| -30 C (-22 F): Days with min | 4 | 2 | 1996 | 1 |
| 20 C (68 F): Tropical nights (min | 43 | 60 | 2002 | 62 |
| 25 C (77 F): Days with min | 33 | 9 | 2012 | 11 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 52 | 50 | 2019 | 33 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 52 | 18 | 2009 | 17 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 45 | 6 | 1870 | 4 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 8 | 3 | 1870 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 23 | 4 | 1990 | 1 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 5 | 1 | 1995 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1873.
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 (2026-10-17).