Alderson Weather Records (USC00460102)
Record envelope, standing records and threshold days for Alderson (USC00460102), West Virginia, United States, with 83 years of record.
Key Facts for Alderson
- Alderson (USC00460102) is a weather station in West Virginia, United States at 37.73 latitude and -80.66 longitude, 473 m (1,552 ft) above sea level.
- The station reports from 1944 to 2026, 83 years of record.
- 1,464 records set at Alderson still stand.
- Records are tracked for tmax, tmin, prcp, snow, snwd: an element needs 30 years of data to be eligible.
- Alderson set a daily record precipitation of 27.4 mm (1.1 in) on 24 September 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: West Virginia, United States, 37.73 latitude, -80.66 longitude.
- Elevation: 473 m (1,552 ft).
- Period of record: 1944 to 2026, 83 years.
- Eligible elements: tmax, tmin, prcp, snow, snwd.
Daily Record Envelope and 2026
19 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 25.0 C (77.0 F) | -22.8 C (-9.0 F) | 16.7 C (62.1 F) | -17.2 C (1.0 F) |
| Feb | 25.6 C (78.1 F) | -24.4 C (-11.9 F) | 20.0 C (68.0 F) | -18.3 C (-0.9 F) |
| Mar | 31.1 C (88.0 F) | -17.8 C (0.0 F) | 30.0 C (86.0 F) | -8.3 C (17.1 F) |
| Apr | 32.8 C (91.0 F) | -10.6 C (12.9 F) | 30.6 C (87.1 F) | -3.3 C (26.1 F) |
| May | 35.6 C (96.1 F) | -4.4 C (24.1 F) | 32.2 C (90.0 F) | -0.6 C (30.9 F) |
| Jun | 35.6 C (96.1 F) | 2.8 C (37.0 F) | 32.2 C (90.0 F) | 8.9 C (48.0 F) |
| Jul | 38.9 C (102.0 F) | 4.4 C (39.9 F) | 35.0 C (95.0 F) | 13.9 C (57.0 F) |
| Aug | 36.7 C (98.1 F) | 5.6 C (42.1 F) | 31.7 C (89.1 F) | 12.8 C (55.0 F) |
| Sep | 37.2 C (99.0 F) | -0.6 C (30.9 F) | 33.9 C (93.0 F) | 5.6 C (42.1 F) |
| Oct | 34.4 C (93.9 F) | -11.7 C (10.9 F) | 28.9 C (84.0 F) | 4.4 C (39.9 F) |
| Nov | 29.4 C (84.9 F) | -14.4 C (6.1 F) | n/a | n/a |
| Dec | 25.6 C (78.1 F) | -22.2 C (-8.0 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1944 | 7 |
| 1945 | 31 |
| 1946 | 73 |
| 1947 | 52 |
| 1948 | 35 |
| 1949 | 16 |
| 1950 | 60 |
| 1951 | 42 |
| 1952 | 43 |
| 1953 | 64 |
| 1954 | 54 |
| 1955 | 47 |
| 1956 | 46 |
| 1957 | 24 |
| 1958 | 15 |
| 1959 | 21 |
| 1960 | 3 |
| 2005 | 26 |
| 2006 | 47 |
| 2007 | 54 |
| 2008 | 37 |
| 2009 | 34 |
| 2010 | 62 |
| 2011 | 34 |
| 2012 | 29 |
| 2013 | 33 |
| 2014 | 45 |
| 2015 | 53 |
| 2016 | 46 |
| 2017 | 38 |
| 2018 | 52 |
| 2019 | 27 |
| 2020 | 29 |
| 2021 | 19 |
| 2022 | 30 |
| 2023 | 32 |
| 2024 | 29 |
| 2025 | 46 |
| 2026 | 29 |
All-Time Record Progression
2 new records| Date | Kind | Detail |
|---|---|---|
| 1983-02-12 | Record snow depth | Record snow depth 45.7 cm (18.0 in) |
| 2009-12-19 | Record daily snowfall | Record daily snowfall 41.1 cm (16.2 in) |
Wettest Day of Each Month
Aug: 118.1 mm (4.6 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 59.7 mm (2.4 in) | 20 January 2019 |
| Feb | 68.3 mm (2.7 in) | 21 February 1953 |
| Mar | 56.1 mm (2.2 in) | 12 March 1963 |
| Apr | 63.2 mm (2.5 in) | 5 April 1977 |
| May | 72.1 mm (2.8 in) | 25 May 1996 |
| Jun | 80.8 mm (3.2 in) | 18 June 1972 |
| Jul | 109.2 mm (4.3 in) | 25 July 2002 |
| Aug | 118.1 mm (4.6 in) | 20 August 1969 |
| Sep | 91.9 mm (3.6 in) | 14 September 1966 |
| Oct | 63.2 mm (2.5 in) | 25 October 2007 |
| Nov | 49.0 mm (1.9 in) | 27 November 2013 |
| Dec | 49.3 mm (1.9 in) | 9 December 2009 |
Period of Record Coverage
1944 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1944 | 44 | 12% | No |
| 1945 | 205 | 56% | No |
| 1946 | 323 | 88% | No |
| 1947 | 219 | 60% | No |
| 1948 | 267 | 73% | No |
| 1949 | 180 | 49% | No |
| 1950 | 352 | 96% | Yes |
| 1951 | 322 | 88% | No |
| 1952 | 359 | 98% | Yes |
| 1953 | 363 | 99% | Yes |
| 1954 | 355 | 97% | Yes |
| 1955 | 362 | 99% | Yes |
| 1956 | 320 | 87% | No |
| 1957 | 308 | 84% | No |
| 1958 | 244 | 67% | No |
| 1959 | 201 | 55% | No |
| 1960 | 29 | 8% | No |
| 2005 | 334 | 92% | Yes |
| 2006 | 365 | 100% | Yes |
| 2007 | 358 | 98% | Yes |
| 2008 | 366 | 100% | Yes |
| 2009 | 365 | 100% | Yes |
| 2010 | 365 | 100% | Yes |
| 2011 | 365 | 100% | Yes |
| 2012 | 362 | 99% | Yes |
| 2013 | 363 | 99% | Yes |
| 2014 | 361 | 99% | Yes |
| 2015 | 358 | 98% | Yes |
| 2016 | 361 | 99% | Yes |
| 2017 | 352 | 96% | Yes |
| 2018 | 361 | 99% | Yes |
| 2019 | 364 | 100% | Yes |
| 2020 | 366 | 100% | Yes |
| 2021 | 365 | 100% | Yes |
| 2022 | 364 | 100% | Yes |
| 2023 | 364 | 100% | Yes |
| 2024 | 365 | 100% | Yes |
| 2025 | 355 | 97% | Yes |
| 2026 | 270 | 74% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 24 September 2026 | Alderson, US | daily rain (Provisional) | 27.4 mm (1.1 in) | 4.5 mm (0.18 in) | 51 years | 26 of 100 (Routine) |
| 21 September 2026 | Alderson, US | daily high min (Provisional) | 18.3 C (64.9 F) | 1.6 C (2.9 F) | 80 years | 35 of 100 (Notable) |
| 18 September 2026 | Alderson, US | daily high max (Provisional) | 33.3 C (91.9 F) | 1.6 C (2.9 F) | 80 years | 35 of 100 (Notable) |
| 16 September 2026 | Alderson, US | daily high max (Tie, Provisional) | 31.1 C (88.0 F) | tie | 68 years | 7 of 100 (Routine) |
| 13 September 2026 | Alderson, US | daily high min (Provisional) | 19.4 C (66.9 F) | 1.1 C (2.0 F) | 5 years | 11 of 100 (Routine) |
| 12 September 2026 | Alderson, US | daily high min (Provisional) | 19.4 C (66.9 F) | 1.1 C (2.0 F) | 12 years | 13 of 100 (Routine) |
| 3 September 2026 | Alderson, US | daily high min (Tie, Provisional) | 18.9 C (66.0 F) | tie | 12 years | 2 of 100 (Routine) |
| 2 September 2026 | Alderson, US | daily high min (Tie, Provisional) | 20.0 C (68.0 F) | tie | 76 years | 7 of 100 (Routine) |
| 1 September 2026 | Alderson, US | daily high min (Tie, Provisional) | 19.4 C (66.9 F) | tie | 76 years | 7 of 100 (Routine) |
| 18 August 2026 | Alderson, US | daily high min (Provisional) | 21.1 C (70.0 F) | 0.5 C (0.9 F) | 80 years | 33 of 100 (Routine) |
| 12 August 2026 | Alderson, US | daily low max (Tie) | 21.7 C (71.1 F) | tie | 12 years | 2 of 100 (Routine) |
| 22 July 2026 | Alderson, US | daily high min | 21.1 C (70.0 F) | 0.5 C (0.9 F) | 20 years | 15 of 100 (Routine) |
| 19 July 2026 | Alderson, US | daily high min | 21.1 C (70.0 F) | 0.5 C (0.9 F) | 12 years | 12 of 100 (Routine) |
| 18 July 2026 | Alderson, US | daily high min (Tie) | 20.0 C (68.0 F) | tie | 73 years | 7 of 100 (Routine) |
| 13 July 2026 | Alderson, US | daily low max | 23.9 C (75.0 F) | 1.7 C (3.1 F) | 19 years | 18 of 100 (Routine) |
| 11 July 2026 | Alderson, US | daily high min (Tie) | 20.0 C (68.0 F) | tie | 76 years | 7 of 100 (Routine) |
| 9 July 2026 | Alderson, US | daily high min (Tie) | 20.0 C (68.0 F) | tie | 7 years | 2 of 100 (Routine) |
| 7 July 2026 | Alderson, US | daily high min | 20.0 C (68.0 F) | 0.6 C (1.1 F) | 72 years | 31 of 100 (Routine) |
| 4 July 2026 | Alderson, US | daily high min | 20.6 C (69.1 F) | 1.2 C (2.2 F) | 73 years | 34 of 100 (Routine) |
| 4 July 2026 | Alderson, US | daily high max (Tie) | 35.0 C (95.0 F) | tie | 71 years | 7 of 100 (Routine) |
Climate Trend
25 complete years, 1950 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1950 | 12.3 C | +0.09 C |
| 1952 | 12.8 C | +0.61 C |
| 1953 | 12.8 C | +0.59 C |
| 1954 | 12.5 C | +0.29 C |
| 1955 | 12.5 C | +0.35 C |
| 2006 | 12.2 C | +0.04 C |
| 2007 | 12.3 C | +0.16 C |
| 2008 | 11.6 C | -0.61 C |
| 2009 | 11.8 C | -0.35 C |
| 2010 | 11.7 C | -0.46 C |
| 2011 | 12.5 C | +0.36 C |
| 2012 | 12.6 C | +0.43 C |
| 2013 | 11.3 C | -0.89 C |
| 2014 | 11.0 C | -1.21 C |
| 2015 | 12.3 C | +0.14 C |
| 2016 | 12.8 C | +0.64 C |
| 2017 | 12.3 C | +0.14 C |
| 2018 | 12.1 C | -0.09 C |
| 2019 | 12.4 C | +0.26 C |
| 2020 | 12.2 C | +0.00 C |
| 2021 | 11.9 C | -0.30 C |
| 2022 | 11.3 C | -0.91 C |
| 2023 | 12.2 C | +0.04 C |
| 2024 | 13.0 C | +0.80 C |
| 2025 | 12.0 C | -0.15 C |
This station does not have enough complete years (30 are needed) to fit a temperature trend.
A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.
Extremes by Year
1944 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 38.9 C (102.0 F) | 1954 | 35.0 C (95.0 F) | 39 |
| Coldest night (TNn) | -24.4 C (-11.9 F) | 1951 | -16.7 C (1.9 F) | 39 |
| Wettest day (Rx1day) | 118.1 mm (4.6 in) | 1969 | 48.5 mm (1.9 in) | 83 |
| Wettest five days (Rx5day) | 142.0 mm (5.6 in) | 2020 | 82.1 mm (3.2 in) | 83 |
| Longest dry spell (CDD) | 38 days | 1987 | 17 days | 83 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1944 | 15.6 C (60.1 F) |
| 1945 | 36.7 C (98.1 F) |
| 1946 | 35.0 C (95.0 F) |
| 1947 | 36.7 C (98.1 F) |
| 1948 | 36.7 C (98.1 F) |
| 1949 | 35.0 C (95.0 F) |
| 1950 | 33.3 C (91.9 F) |
| 1951 | 36.7 C (98.1 F) |
| 1952 | 37.8 C (100.0 F) |
| 1953 | 37.2 C (99.0 F) |
| 1954 | 38.9 C (102.0 F) |
| 1955 | 37.2 C (99.0 F) |
| 1956 | 35.6 C (96.1 F) |
| 1957 | 35.0 C (95.0 F) |
| 1958 | 32.2 C (90.0 F) |
| 1959 | 34.4 C (93.9 F) |
| 1960 | 13.3 C (55.9 F) |
| 1961 | n/a |
| 1962 | n/a |
| 1963 | n/a |
| 1964 | n/a |
| 1965 | n/a |
| 1966 | n/a |
| 1967 | n/a |
| 1968 | n/a |
| 1969 | n/a |
| 1970 | n/a |
| 1971 | n/a |
| 1972 | n/a |
| 1973 | n/a |
| 1974 | n/a |
| 1975 | n/a |
| 1976 | n/a |
| 1977 | n/a |
| 1978 | n/a |
| 1979 | n/a |
| 1980 | n/a |
| 1981 | n/a |
| 1982 | n/a |
| 1983 | n/a |
| 1984 | n/a |
| 1985 | n/a |
| 1986 | n/a |
| 1987 | n/a |
| 1988 | n/a |
| 1989 | n/a |
| 1990 | n/a |
| 1991 | n/a |
| 1992 | n/a |
| 1993 | n/a |
| 1994 | n/a |
| 1995 | n/a |
| 1996 | n/a |
| 1997 | n/a |
| 1998 | n/a |
| 1999 | n/a |
| 2000 | n/a |
| 2001 | n/a |
| 2002 | n/a |
| 2003 | n/a |
| 2004 | n/a |
| 2005 | 34.4 C (93.9 F) |
| 2006 | 35.6 C (96.1 F) |
| 2007 | 36.7 C (98.1 F) |
| 2008 | 34.4 C (93.9 F) |
| 2009 | 32.8 C (91.0 F) |
| 2010 | 36.7 C (98.1 F) |
| 2011 | 37.2 C (99.0 F) |
| 2012 | 36.7 C (98.1 F) |
| 2013 | 32.2 C (90.0 F) |
| 2014 | 32.8 C (91.0 F) |
| 2015 | 33.3 C (91.9 F) |
| 2016 | 35.6 C (96.1 F) |
| 2017 | 33.3 C (91.9 F) |
| 2018 | 33.9 C (93.0 F) |
| 2019 | 34.4 C (93.9 F) |
| 2020 | 33.9 C (93.0 F) |
| 2021 | 34.4 C (93.9 F) |
| 2022 | 33.9 C (93.0 F) |
| 2023 | 32.8 C (91.0 F) |
| 2024 | 35.6 C (96.1 F) |
| 2025 | 34.4 C (93.9 F) |
| 2026 | 35.0 C (95.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1944 | -22.2 C (-8.0 F) |
| 1945 | -18.9 C (-2.0 F) |
| 1946 | -13.3 C (8.1 F) |
| 1947 | -22.2 C (-8.0 F) |
| 1948 | -20.0 C (-4.0 F) |
| 1949 | -13.9 C (7.0 F) |
| 1950 | -14.4 C (6.1 F) |
| 1951 | -24.4 C (-11.9 F) |
| 1952 | -13.9 C (7.0 F) |
| 1953 | -21.1 C (-6.0 F) |
| 1954 | -15.0 C (5.0 F) |
| 1955 | -16.7 C (1.9 F) |
| 1956 | -14.4 C (6.1 F) |
| 1957 | -21.7 C (-7.1 F) |
| 1958 | -18.9 C (-2.0 F) |
| 1959 | -9.4 C (15.1 F) |
| 1960 | -16.1 C (3.0 F) |
| 1961 | n/a |
| 1962 | n/a |
| 1963 | n/a |
| 1964 | n/a |
| 1965 | n/a |
| 1966 | n/a |
| 1967 | n/a |
| 1968 | n/a |
| 1969 | n/a |
| 1970 | n/a |
| 1971 | n/a |
| 1972 | n/a |
| 1973 | n/a |
| 1974 | n/a |
| 1975 | n/a |
| 1976 | n/a |
| 1977 | n/a |
| 1978 | n/a |
| 1979 | n/a |
| 1980 | n/a |
| 1981 | n/a |
| 1982 | n/a |
| 1983 | n/a |
| 1984 | n/a |
| 1985 | n/a |
| 1986 | n/a |
| 1987 | n/a |
| 1988 | n/a |
| 1989 | n/a |
| 1990 | n/a |
| 1991 | n/a |
| 1992 | n/a |
| 1993 | n/a |
| 1994 | n/a |
| 1995 | n/a |
| 1996 | n/a |
| 1997 | n/a |
| 1998 | n/a |
| 1999 | n/a |
| 2000 | n/a |
| 2001 | n/a |
| 2002 | n/a |
| 2003 | n/a |
| 2004 | n/a |
| 2005 | -14.4 C (6.1 F) |
| 2006 | -14.4 C (6.1 F) |
| 2007 | -19.4 C (-2.9 F) |
| 2008 | -16.1 C (3.0 F) |
| 2009 | -20.0 C (-4.0 F) |
| 2010 | -17.2 C (1.0 F) |
| 2011 | -15.0 C (5.0 F) |
| 2012 | -12.8 C (9.0 F) |
| 2013 | -14.4 C (6.1 F) |
| 2014 | -22.8 C (-9.0 F) |
| 2015 | -20.6 C (-5.1 F) |
| 2016 | -18.3 C (-0.9 F) |
| 2017 | -17.8 C (0.0 F) |
| 2018 | -20.0 C (-4.0 F) |
| 2019 | -16.1 C (3.0 F) |
| 2020 | -13.3 C (8.1 F) |
| 2021 | -12.2 C (10.0 F) |
| 2022 | -18.9 C (-2.0 F) |
| 2023 | -12.2 C (10.0 F) |
| 2024 | -16.7 C (1.9 F) |
| 2025 | -17.8 C (0.0 F) |
| 2026 | -18.3 C (-0.9 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1944 | 38.1 mm (1.5 in) |
| 1945 | 53.3 mm (2.1 in) |
| 1946 | 47.8 mm (1.9 in) |
| 1947 | 24.9 mm (1.0 in) |
| 1948 | 43.2 mm (1.7 in) |
| 1949 | 33.0 mm (1.3 in) |
| 1950 | 39.4 mm (1.6 in) |
| 1951 | 33.0 mm (1.3 in) |
| 1952 | 37.3 mm (1.5 in) |
| 1953 | 68.3 mm (2.7 in) |
| 1954 | 66.5 mm (2.6 in) |
| 1955 | 37.6 mm (1.5 in) |
| 1956 | 42.7 mm (1.7 in) |
| 1957 | 43.4 mm (1.7 in) |
| 1958 | 53.3 mm (2.1 in) |
| 1959 | 31.5 mm (1.2 in) |
| 1960 | 37.1 mm (1.5 in) |
| 1961 | 38.4 mm (1.5 in) |
| 1962 | 27.4 mm (1.1 in) |
| 1963 | 56.1 mm (2.2 in) |
| 1964 | 44.5 mm (1.8 in) |
| 1965 | 36.3 mm (1.4 in) |
| 1966 | 91.9 mm (3.6 in) |
| 1967 | 54.6 mm (2.1 in) |
| 1968 | 40.4 mm (1.6 in) |
| 1969 | 118.1 mm (4.6 in) |
| 1970 | 39.9 mm (1.6 in) |
| 1971 | 50.8 mm (2.0 in) |
| 1972 | 80.8 mm (3.2 in) |
| 1973 | 43.9 mm (1.7 in) |
| 1974 | 57.2 mm (2.3 in) |
| 1975 | 34.3 mm (1.4 in) |
| 1976 | 50.8 mm (2.0 in) |
| 1977 | 63.2 mm (2.5 in) |
| 1978 | 47.5 mm (1.9 in) |
| 1979 | 46.2 mm (1.8 in) |
| 1980 | 54.9 mm (2.2 in) |
| 1981 | 53.3 mm (2.1 in) |
| 1982 | 66.3 mm (2.6 in) |
| 1983 | 57.9 mm (2.3 in) |
| 1984 | 67.3 mm (2.6 in) |
| 1985 | 40.1 mm (1.6 in) |
| 1986 | 66.3 mm (2.6 in) |
| 1987 | 48.5 mm (1.9 in) |
| 1988 | 82.3 mm (3.2 in) |
| 1989 | 39.4 mm (1.6 in) |
| 1990 | 68.1 mm (2.7 in) |
| 1991 | 32.5 mm (1.3 in) |
| 1992 | 34.8 mm (1.4 in) |
| 1993 | 39.1 mm (1.5 in) |
| 1994 | 39.6 mm (1.6 in) |
| 1995 | 46.5 mm (1.8 in) |
| 1996 | 72.1 mm (2.8 in) |
| 1997 | 45.0 mm (1.8 in) |
| 1998 | 52.6 mm (2.1 in) |
| 1999 | 62.5 mm (2.5 in) |
| 2000 | 53.3 mm (2.1 in) |
| 2001 | 56.1 mm (2.2 in) |
| 2002 | 109.2 mm (4.3 in) |
| 2003 | 40.1 mm (1.6 in) |
| 2004 | 68.3 mm (2.7 in) |
| 2005 | 42.4 mm (1.7 in) |
| 2006 | 41.9 mm (1.6 in) |
| 2007 | 63.2 mm (2.5 in) |
| 2008 | 43.2 mm (1.7 in) |
| 2009 | 66.5 mm (2.6 in) |
| 2010 | 41.7 mm (1.6 in) |
| 2011 | 46.7 mm (1.8 in) |
| 2012 | 54.4 mm (2.1 in) |
| 2013 | 86.4 mm (3.4 in) |
| 2014 | 44.7 mm (1.8 in) |
| 2015 | 51.3 mm (2.0 in) |
| 2016 | 69.9 mm (2.8 in) |
| 2017 | 61.0 mm (2.4 in) |
| 2018 | 66.0 mm (2.6 in) |
| 2019 | 59.7 mm (2.4 in) |
| 2020 | 63.5 mm (2.5 in) |
| 2021 | 55.9 mm (2.2 in) |
| 2022 | 45.7 mm (1.8 in) |
| 2023 | 46.2 mm (1.8 in) |
| 2024 | 55.9 mm (2.2 in) |
| 2025 | 58.7 mm (2.3 in) |
| 2026 | 45.7 mm (1.8 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1944 | 54.3 mm (2.1 in) |
| 1945 | 124.0 mm (4.9 in) |
| 1946 | 94.8 mm (3.7 in) |
| 1947 | 34.5 mm (1.4 in) |
| 1948 | 66.7 mm (2.6 in) |
| 1949 | 77.2 mm (3.0 in) |
| 1950 | 91.9 mm (3.6 in) |
| 1951 | 71.4 mm (2.8 in) |
| 1952 | 69.8 mm (2.7 in) |
| 1953 | 68.3 mm (2.7 in) |
| 1954 | 105.7 mm (4.2 in) |
| 1955 | 82.1 mm (3.2 in) |
| 1956 | 62.2 mm (2.4 in) |
| 1957 | 102.3 mm (4.0 in) |
| 1958 | 79.0 mm (3.1 in) |
| 1959 | 53.3 mm (2.1 in) |
| 1960 | 42.1 mm (1.7 in) |
| 1961 | 70.4 mm (2.8 in) |
| 1962 | 50.4 mm (2.0 in) |
| 1963 | 65.0 mm (2.6 in) |
| 1964 | 104.2 mm (4.1 in) |
| 1965 | 61.5 mm (2.4 in) |
| 1966 | 101.6 mm (4.0 in) |
| 1967 | 76.7 mm (3.0 in) |
| 1968 | 58.1 mm (2.3 in) |
| 1969 | 128.5 mm (5.1 in) |
| 1970 | 88.7 mm (3.5 in) |
| 1971 | 79.5 mm (3.1 in) |
| 1972 | 137.9 mm (5.4 in) |
| 1973 | 82.1 mm (3.2 in) |
| 1974 | 75.5 mm (3.0 in) |
| 1975 | 66.8 mm (2.6 in) |
| 1976 | 86.4 mm (3.4 in) |
| 1977 | 105.2 mm (4.1 in) |
| 1978 | 64.6 mm (2.5 in) |
| 1979 | 69.3 mm (2.7 in) |
| 1980 | 114.6 mm (4.5 in) |
| 1981 | 97.5 mm (3.8 in) |
| 1982 | 92.4 mm (3.6 in) |
| 1983 | 126.0 mm (5.0 in) |
| 1984 | 87.9 mm (3.5 in) |
| 1985 | 75.4 mm (3.0 in) |
| 1986 | 110.7 mm (4.4 in) |
| 1987 | 87.9 mm (3.5 in) |
| 1988 | 99.6 mm (3.9 in) |
| 1989 | 92.6 mm (3.6 in) |
| 1990 | 85.7 mm (3.4 in) |
| 1991 | 81.8 mm (3.2 in) |
| 1992 | 54.8 mm (2.2 in) |
| 1993 | 53.1 mm (2.1 in) |
| 1994 | 91.0 mm (3.6 in) |
| 1995 | 63.3 mm (2.5 in) |
| 1996 | 95.8 mm (3.8 in) |
| 1997 | 76.9 mm (3.0 in) |
| 1998 | 71.9 mm (2.8 in) |
| 1999 | 64.0 mm (2.5 in) |
| 2000 | 69.3 mm (2.7 in) |
| 2001 | 125.4 mm (4.9 in) |
| 2002 | 136.1 mm (5.4 in) |
| 2003 | 91.7 mm (3.6 in) |
| 2004 | 84.6 mm (3.3 in) |
| 2005 | 90.4 mm (3.6 in) |
| 2006 | 126.2 mm (5.0 in) |
| 2007 | 109.6 mm (4.3 in) |
| 2008 | 57.3 mm (2.3 in) |
| 2009 | 78.8 mm (3.1 in) |
| 2010 | 53.8 mm (2.1 in) |
| 2011 | 73.6 mm (2.9 in) |
| 2012 | 82.1 mm (3.2 in) |
| 2013 | 109.8 mm (4.3 in) |
| 2014 | 77.2 mm (3.0 in) |
| 2015 | 81.3 mm (3.2 in) |
| 2016 | 122.0 mm (4.8 in) |
| 2017 | 83.8 mm (3.3 in) |
| 2018 | 86.4 mm (3.4 in) |
| 2019 | 90.2 mm (3.6 in) |
| 2020 | 142.0 mm (5.6 in) |
| 2021 | 62.5 mm (2.5 in) |
| 2022 | 80.6 mm (3.2 in) |
| 2023 | 79.8 mm (3.1 in) |
| 2024 | 93.0 mm (3.7 in) |
| 2025 | 98.5 mm (3.9 in) |
| 2026 | 69.6 mm (2.7 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1944 | 25 days |
| 1945 | 17 days |
| 1946 | 25 days |
| 1947 | 19 days |
| 1948 | 15 days |
| 1949 | 14 days |
| 1950 | 24 days |
| 1951 | 30 days |
| 1952 | 23 days |
| 1953 | 35 days |
| 1954 | 16 days |
| 1955 | 16 days |
| 1956 | 19 days |
| 1957 | 18 days |
| 1958 | 17 days |
| 1959 | 23 days |
| 1960 | 19 days |
| 1961 | 14 days |
| 1962 | 14 days |
| 1963 | 28 days |
| 1964 | 15 days |
| 1965 | 23 days |
| 1966 | 16 days |
| 1967 | 16 days |
| 1968 | 34 days |
| 1969 | 18 days |
| 1970 | 13 days |
| 1971 | 18 days |
| 1972 | 14 days |
| 1973 | 20 days |
| 1974 | 17 days |
| 1975 | 16 days |
| 1976 | 16 days |
| 1977 | 18 days |
| 1978 | 29 days |
| 1979 | 17 days |
| 1980 | 14 days |
| 1981 | 16 days |
| 1982 | 16 days |
| 1983 | 18 days |
| 1984 | 18 days |
| 1985 | 13 days |
| 1986 | 22 days |
| 1987 | 38 days |
| 1988 | 14 days |
| 1989 | 18 days |
| 1990 | 14 days |
| 1991 | 15 days |
| 1992 | 18 days |
| 1993 | 20 days |
| 1994 | 17 days |
| 1995 | 16 days |
| 1996 | 11 days |
| 1997 | 25 days |
| 1998 | 21 days |
| 1999 | 13 days |
| 2000 | 22 days |
| 2001 | 31 days |
| 2002 | 17 days |
| 2003 | 13 days |
| 2004 | 27 days |
| 2005 | 29 days |
| 2006 | 14 days |
| 2007 | 34 days |
| 2008 | 16 days |
| 2009 | 11 days |
| 2010 | 14 days |
| 2011 | 12 days |
| 2012 | 13 days |
| 2013 | 18 days |
| 2014 | 17 days |
| 2015 | 16 days |
| 2016 | 19 days |
| 2017 | 22 days |
| 2018 | 9 days |
| 2019 | 28 days |
| 2020 | 11 days |
| 2021 | 23 days |
| 2022 | 13 days |
| 2023 | 20 days |
| 2024 | 26 days |
| 2025 | 15 days |
| 2026 | 9 days |
Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.
Frost Dates and Growing Season
25 years with a frostAcross 25 years with a frost, the median last spring frost at Alderson falls on 22 April and the median first autumn frost on 18 October, which leaves a median of 178 days between them.
Fitted over all years, the growing season changes by +1.6 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1950 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 22 April | n/a | 22 April | n/a | +0.3 days per decade |
| First autumn frost | 18 October | n/a | 18 October | n/a | +1.9 days per decade |
| Growing days | 178 days | n/a | 178 days | n/a | +1.6 days per decade |
A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.
Rainfall Return Levels
74 years, 1950 to 2025A day with at least 50.8 mm (2.0 in) of rain is expected about once in 2 years. A day with at least 110.5 mm (4.4 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 50.8 mm (2.0 in) | |
| 5 years | 65.3 mm (2.6 in) | |
| 10 years | 75.5 mm (3.0 in) | |
| 25 years | 89.1 mm (3.5 in) | |
| 50 years | 99.6 mm (3.9 in) | |
| 100 years | 110.5 mm (4.4 in) | Longer than the 74 years of record |
The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 74 years of values from 1950 to 2025.
A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.
The largest wettest-day totals in the fit: 118.1 mm (4.6 in) in 1969; 109.2 mm (4.3 in) in 2002; 91.9 mm (3.6 in) in 1966.
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 2026-10-12 (12 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-13).