Alderson Threshold Days by Year (USC00460102)
15 fixed thresholds counted per year at Alderson (USC00460102): hot days, frost, tropical nights and heavy rain, with the most days in a year.
Key Facts for Alderson Thresholds
- Alderson: days with 10 mm (0.39 in) or more of precipitation in 75 years, most in 2020 with 59.
- Alderson: days with 25 mm (0.98 in) or more of precipitation in 75 years, most in 1972 with 13.
- Alderson: days with 50 mm (1.97 in) or more of precipitation in 40 years, most in 1954 with 4.
- Alderson: nights with a minimum temperature at or below 0 C (32 F) in 29 years, most in 2014 with 147.
- 15 fixed thresholds have at least one qualifying day at Alderson.
Days at or above 30 C (86 F)
27 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1950 | 22 | 60.8 |
| 1952 | 63 | 60.8 |
| 1953 | 87 | 60.8 |
| 1954 | 62 | 60.8 |
| 1955 | 70 | 60.8 |
| 2005 | 56 | 53.4 |
| 2006 | 52 | 53.4 |
| 2007 | 84 | 53.4 |
| 2008 | 46 | 53.4 |
| 2009 | 29 | 53.4 |
| 2010 | 92 | 59.5 |
| 2011 | 78 | 59.5 |
| 2012 | 61 | 59.5 |
| 2013 | 32 | 59.5 |
| 2014 | 43 | 59.5 |
| 2015 | 64 | 59.5 |
| 2016 | 73 | 59.5 |
| 2017 | 34 | 59.5 |
| 2018 | 52 | 59.5 |
| 2019 | 66 | 59.5 |
| 2020 | 40 | 44.9 |
| 2021 | 47 | 44.9 |
| 2022 | 39 | 44.9 |
| 2023 | 30 | 44.9 |
| 2024 | 52 | 44.9 |
| 2025 | 55 | 44.9 |
| 2026 | 51 | 44.9 |
| Year | First date | Last date |
|---|---|---|
| 1950 | 1950-04-25 | 1950-09-03 |
| 1952 | 1952-04-22 | 1952-09-14 |
| 1953 | 1953-05-05 | 1953-10-05 |
| 1954 | 1954-04-18 | 1954-09-19 |
| 1955 | 1955-04-21 | 1955-09-20 |
| 2005 | 2005-05-10 | 2005-10-04 |
| 2006 | 2006-05-29 | 2006-08-31 |
| 2007 | 2007-05-02 | 2007-10-09 |
| 2008 | 2008-04-20 | 2008-09-23 |
| 2009 | 2009-04-25 | 2009-09-24 |
| 2010 | 2010-04-03 | 2010-09-26 |
| 2011 | 2011-04-11 | 2011-09-15 |
| 2012 | 2012-05-03 | 2012-09-08 |
| 2013 | 2013-04-11 | 2013-09-12 |
| 2014 | 2014-05-09 | 2014-09-07 |
| 2015 | 2015-05-07 | 2015-09-20 |
| 2016 | 2016-05-28 | 2016-10-20 |
| 2017 | 2017-04-30 | 2017-09-28 |
| 2018 | 2018-05-04 | 2018-10-08 |
| 2019 | 2019-05-01 | 2019-10-04 |
| 2020 | 2020-03-29 | 2020-09-12 |
| 2021 | 2021-04-28 | 2021-09-21 |
| 2022 | 2022-04-24 | 2022-08-30 |
| 2023 | 2023-06-03 | 2023-09-07 |
| 2024 | 2024-04-30 | 2024-09-24 |
| 2025 | 2025-04-06 | 2025-10-08 |
| 2026 | 2026-03-23 | 2026-09-20 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 27 | 92 | 2010 | 51 |
| 35 C (95 F): Days | 12 | 11 | 2010 | 1 |
| 90 F (32.2 C): Days | 27 | 51 | 1953 | 15 |
| 100 F (37.8 C): Days | 2 | 1 | 1952 | 1 |
| 0 C (32 F): Ice days (max | 27 | 39 | 2010 | 17 |
| 0 C (32 F): Frost days (min | 29 | 147 | 2014 | 75 |
| -10 C (14 F): Days with min | 29 | 31 | 2014 | 22 |
| -20 C (-4 F): Days with min | 6 | 3 | 1953 | 1 |
| 20 C (68 F): Tropical nights (min | 26 | 20 | 2025 | 18 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 75 | 59 | 2020 | 30 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 75 | 13 | 1972 | 7 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 40 | 4 | 1954 | 2 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 2 | 1 | 1969 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 24 | 6 | 1966 | 1 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 5 | 1 | 2009 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1950.
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).