Alwen Weather Records (UKE00105882)
Record envelope, standing records and threshold days for Alwen (UKE00105882), United Kingdom, with 68 years of record.
Key Facts for Alwen
- Alwen (UKE00105882) is a weather station in United Kingdom at 53.06 latitude and -3.55 longitude, 345 m (1,132 ft) above sea level.
- The station reports from 1959 to 2026, 68 years of record.
- 1,464 records set at Alwen still stand.
- Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
- Alwen set a daily record high minimum temperature of 8.3 C (46.9 F) on 17 April 2026.
About the Station
- Location: United Kingdom, 53.06 latitude, -3.55 longitude.
- Elevation: 345 m (1,132 ft).
- Period of record: 1959 to 2026, 68 years.
- Eligible elements: tmax, tmin, prcp.
Daily Record Envelope and 2026
2 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 14.8 C (58.6 F) | -16.7 C (1.9 F) | 9.1 C (48.4 F) | -7.0 C (19.4 F) |
| Feb | 19.7 C (67.5 F) | -16.7 C (1.9 F) | 10.8 C (51.4 F) | -5.2 C (22.6 F) |
| Mar | 21.1 C (70.0 F) | -17.2 C (1.0 F) | 13.2 C (55.8 F) | n/a |
| Apr | 24.3 C (75.7 F) | -9.5 C (14.9 F) | 19.7 C (67.5 F) | -2.8 C (27.0 F) |
| May | 24.6 C (76.3 F) | -6.1 C (21.0 F) | n/a | n/a |
| Jun | 30.0 C (86.0 F) | -2.5 C (27.5 F) | n/a | n/a |
| Jul | 33.6 C (92.5 F) | -1.1 C (30.0 F) | n/a | n/a |
| Aug | 30.8 C (87.4 F) | -1.1 C (30.0 F) | n/a | n/a |
| Sep | 28.0 C (82.4 F) | -3.3 C (26.1 F) | n/a | n/a |
| Oct | 23.2 C (73.8 F) | -5.0 C (23.0 F) | n/a | n/a |
| Nov | 18.5 C (65.3 F) | -12.0 C (10.4 F) | n/a | n/a |
| Dec | 14.2 C (57.6 F) | -16.8 C (1.8 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1960 | 33 |
| 1961 | 28 |
| 1962 | 33 |
| 1963 | 45 |
| 1964 | 22 |
| 1965 | 38 |
| 1966 | 19 |
| 1967 | 10 |
| 1968 | 26 |
| 1969 | 29 |
| 1970 | 24 |
| 1971 | 24 |
| 1972 | 14 |
| 1973 | 32 |
| 1974 | 18 |
| 1975 | 23 |
| 1976 | 30 |
| 1977 | 26 |
| 1978 | 31 |
| 1979 | 39 |
| 1980 | 26 |
| 1981 | 30 |
| 1982 | 18 |
| 1983 | 20 |
| 1984 | 19 |
| 1985 | 35 |
| 1986 | 30 |
| 1987 | 27 |
| 1988 | 16 |
| 1989 | 21 |
| 1990 | 21 |
| 1991 | 19 |
| 1992 | 10 |
| 1993 | 24 |
| 1994 | 15 |
| 1995 | 32 |
| 1996 | 17 |
| 1997 | 30 |
| 1998 | 23 |
| 1999 | 14 |
| 2000 | 10 |
| 2001 | 9 |
| 2002 | 12 |
| 2003 | 37 |
| 2004 | 7 |
| 2005 | 22 |
| 2006 | 25 |
| 2007 | 17 |
| 2008 | 17 |
| 2009 | 17 |
| 2010 | 33 |
| 2011 | 36 |
| 2012 | 17 |
| 2013 | 29 |
| 2014 | 15 |
| 2015 | 18 |
| 2016 | 27 |
| 2017 | 19 |
| 2018 | 16 |
| 2019 | 22 |
| 2020 | 25 |
| 2021 | 21 |
| 2022 | 14 |
| 2023 | 3 |
| 2026 | 5 |
All-Time Record Progression
8 new records| Date | Kind | Detail |
|---|---|---|
| 1990-08-01 | Record high maximum temperature | Record high maximum temperature 30.8 C (87.4 F) |
| 1995-08-01 | Record high minimum temperature | Record high minimum temperature 16.8 C (62.2 F) |
| 2003-07-16 | Record high minimum temperature | Record high minimum temperature 17.0 C (62.6 F) |
| 2003-08-05 | Record high minimum temperature | Record high minimum temperature 18.5 C (65.3 F) |
| 2006-07-19 | Record high maximum temperature | Record high maximum temperature 31.4 C (88.5 F) |
| 2009-07-02 | Record high minimum temperature | Record high minimum temperature 20.0 C (68.0 F) |
| 2022-07-17 | Record high maximum temperature | Record high maximum temperature 32.9 C (91.2 F) |
| 2022-07-18 | Record high maximum temperature | Record high maximum temperature 33.6 C (92.5 F) |
Wettest Day of Each Month
Sep: 80.0 mm (3.1 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 50.3 mm (2.0 in) | 15 January 2011 |
| Feb | 65.3 mm (2.6 in) | 15 February 2020 |
| Mar | 46.8 mm (1.8 in) | 14 March 1982 |
| Apr | 42.9 mm (1.7 in) | 2 April 1962 |
| May | 49.6 mm (2.0 in) | 3 May 2021 |
| Jun | 60.0 mm (2.4 in) | 25 June 2007 |
| Jul | 62.0 mm (2.4 in) | 31 July 1972 |
| Aug | 72.1 mm (2.8 in) | 25 August 1986 |
| Sep | 80.0 mm (3.1 in) | 11 September 1976 |
| Oct | 67.2 mm (2.6 in) | 14 October 1976 |
| Nov | 72.4 mm (2.9 in) | 26 November 2012 |
| Dec | 64.4 mm (2.5 in) | 25 December 2015 |
Period of Record Coverage
1959 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1959 | 1 | 0% | No |
| 1960 | 345 | 94% | Yes |
| 1961 | 361 | 99% | Yes |
| 1962 | 360 | 99% | Yes |
| 1963 | 363 | 99% | Yes |
| 1964 | 358 | 98% | Yes |
| 1965 | 359 | 98% | Yes |
| 1966 | 356 | 98% | Yes |
| 1967 | 359 | 98% | Yes |
| 1968 | 358 | 98% | Yes |
| 1969 | 355 | 97% | Yes |
| 1970 | 361 | 99% | Yes |
| 1971 | 296 | 81% | No |
| 1972 | 364 | 99% | Yes |
| 1973 | 360 | 99% | Yes |
| 1974 | 361 | 99% | Yes |
| 1975 | 328 | 90% | No |
| 1976 | 360 | 98% | Yes |
| 1977 | 356 | 98% | Yes |
| 1978 | 355 | 97% | Yes |
| 1979 | 355 | 97% | Yes |
| 1980 | 359 | 98% | Yes |
| 1981 | 353 | 97% | Yes |
| 1982 | 358 | 98% | Yes |
| 1983 | 357 | 98% | Yes |
| 1984 | 359 | 98% | Yes |
| 1985 | 359 | 98% | Yes |
| 1986 | 358 | 98% | Yes |
| 1987 | 360 | 99% | Yes |
| 1988 | 366 | 100% | Yes |
| 1989 | 362 | 99% | Yes |
| 1990 | 360 | 99% | Yes |
| 1991 | 361 | 99% | Yes |
| 1992 | 363 | 99% | Yes |
| 1993 | 360 | 99% | Yes |
| 1994 | 361 | 99% | Yes |
| 1995 | 362 | 99% | Yes |
| 1996 | 363 | 99% | Yes |
| 1997 | 357 | 98% | Yes |
| 1998 | 364 | 100% | Yes |
| 1999 | 363 | 99% | Yes |
| 2000 | 365 | 100% | Yes |
| 2001 | 313 | 86% | No |
| 2002 | 362 | 99% | Yes |
| 2003 | 361 | 99% | Yes |
| 2004 | 365 | 100% | Yes |
| 2005 | 364 | 100% | Yes |
| 2006 | 362 | 99% | Yes |
| 2007 | 365 | 100% | Yes |
| 2008 | 363 | 99% | Yes |
| 2009 | 332 | 91% | Yes |
| 2010 | 362 | 99% | Yes |
| 2011 | 360 | 99% | Yes |
| 2012 | 347 | 95% | Yes |
| 2013 | 356 | 98% | Yes |
| 2014 | 359 | 98% | Yes |
| 2015 | 334 | 92% | Yes |
| 2016 | 305 | 83% | No |
| 2017 | 268 | 73% | No |
| 2018 | 332 | 91% | Yes |
| 2019 | 359 | 98% | Yes |
| 2020 | 362 | 99% | Yes |
| 2021 | 359 | 98% | Yes |
| 2022 | 203 | 56% | No |
| 2023 | 113 | 31% | No |
| 2024 | 1 | 0% | No |
| 2025 | 60 | 16% | No |
| 2026 | 83 | 23% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 17 April 2026 | Alwen, GB | daily high min | 8.3 C (46.9 F) | 0.7 C (1.3 F) | 37 years | 19 of 100 (Routine) |
| 7 April 2026 | Alwen, GB | daily high max | 19.7 C (67.5 F) | 0.7 C (1.3 F) | 8 years | 9 of 100 (Routine) |
| 6 April 2026 | Alwen, GB | daily high max | 18.4 C (65.1 F) | 2.3 C (4.1 F) | 56 years | 29 of 100 (Routine) |
| 27 February 2026 | Alwen, GB | daily high min | 5.6 C (42.1 F) | 0.4 C (0.7 F) | 23 years | 13 of 100 (Routine) |
| 22 February 2026 | Alwen, GB | daily high min | 7.0 C (44.6 F) | 0.5 C (0.9 F) | 14 years | 11 of 100 (Routine) |
| 27 May 2025 | Alwen, GB | daily rain | 17.8 mm (0.7 in) | 2.2 mm (0.09 in) | 7 years | 11 of 100 (Routine) |
| 23 January 2025 | Alwen, GB | daily rain | 29.5 mm (1.2 in) | 10.8 mm (0.4 in) | 37 years | 32 of 100 (Routine) |
| 1 September 2024 | Alwen, GB | daily rain | 21.4 mm (0.8 in) | 1.8 mm (0.07 in) | 36 years | 18 of 100 (Routine) |
| 11 July 2024 | Alwen, GB | daily rain | 12.4 mm (0.5 in) | 3.5 mm (0.14 in) | 15 years | 15 of 100 (Routine) |
| 22 May 2024 | Alwen, GB | daily rain | 22.2 mm (0.9 in) | 8.6 mm (0.34 in) | 10 years | 20 of 100 (Routine) |
| 21 May 2024 | Alwen, GB | daily rain | 33.4 mm (1.3 in) | 5.5 mm (0.22 in) | 18 years | 20 of 100 (Routine) |
| 12 May 2024 | Alwen, GB | daily rain | 18.6 mm (0.7 in) | 7.2 mm (0.28 in) | 56 years | 20 of 100 (Routine) |
| 8 April 2024 | Alwen, GB | daily rain | 20.0 mm (0.8 in) | 1.7 mm (0.07 in) | 30 years | 18 of 100 (Routine) |
| 20 October 2023 | Alwen, GB | daily rain | 47.0 mm (1.9 in) | 6.6 mm (0.26 in) | 33 years | 24 of 100 (Routine) |
| 19 October 2023 | Alwen, GB | daily rain | 32.5 mm (1.3 in) | 3.1 mm (0.12 in) | 21 years | 15 of 100 (Routine) |
| 8 October 2023 | Alwen, GB | monthly high max | 23.2 C (73.8 F) | 0.4 C (0.7 F) | 53 years | 33 of 100 (Routine) |
| 14 August 2023 | Alwen, GB | daily rain | 33.4 mm (1.3 in) | 19.0 mm (0.7 in) | 5 years | 36 of 100 (Notable) |
| 23 July 2023 | Alwen, GB | daily rain | 20.5 mm (0.8 in) | 8.1 mm (0.32 in) | 57 years | 20 of 100 (Routine) |
| 8 July 2023 | Alwen, GB | daily high min | 16.6 C (61.9 F) | 3.0 C (5.4 F) | 33 years | 25 of 100 (Routine) |
| 17 February 2023 | Alwen, GB | daily high min | 7.9 C (46.2 F) | 1.9 C (3.4 F) | 11 years | 13 of 100 (Routine) |
Climate Trend
44 complete years, 1961 to 2020| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1961 | 7.1 C | -0.32 C |
| 1962 | 6.1 C | -1.38 C |
| 1963 | 5.9 C | -1.59 C |
| 1964 | 7.0 C | -0.46 C |
| 1965 | 6.4 C | -1.03 C |
| 1966 | 7.0 C | -0.42 C |
| 1967 | 7.2 C | -0.27 C |
| 1968 | 6.8 C | -0.62 C |
| 1969 | 6.7 C | -0.75 C |
| 1970 | 7.1 C | -0.31 C |
| 1973 | 7.0 C | -0.41 C |
| 1974 | 7.0 C | -0.47 C |
| 1976 | 7.2 C | -0.20 C |
| 1977 | 7.0 C | -0.46 C |
| 1978 | 6.9 C | -0.50 C |
| 1979 | 6.1 C | -1.33 C |
| 1980 | 7.1 C | -0.30 C |
| 1981 | 7.0 C | -0.48 C |
| 1982 | 7.4 C | -0.02 C |
| 1983 | 7.7 C | +0.26 C |
| 1984 | 7.3 C | -0.13 C |
| 1985 | 6.7 C | -0.73 C |
| 1986 | 6.5 C | -0.95 C |
| 1987 | 6.9 C | -0.59 C |
| 1988 | 7.7 C | +0.27 C |
| 1989 | 8.2 C | +0.73 C |
| 1990 | 8.4 C | +0.91 C |
| 1991 | 7.3 C | -0.11 C |
| 1992 | 7.7 C | +0.21 C |
| 1993 | 7.3 C | -0.12 C |
| 1994 | 7.7 C | +0.21 C |
| 1995 | 8.5 C | +1.03 C |
| 1996 | 7.2 C | -0.27 C |
| 1997 | 8.7 C | +1.23 C |
| 1998 | 8.4 C | +0.99 C |
| 1999 | 8.6 C | +1.18 C |
| 2000 | 7.8 C | +0.32 C |
| 2002 | 8.3 C | +0.84 C |
| 2003 | 8.8 C | +1.36 C |
| 2005 | 8.6 C | +1.12 C |
| 2006 | 8.9 C | +1.48 C |
| 2010 | 7.0 C | -0.43 C |
| 2011 | 8.9 C | +1.47 C |
| 2020 | 8.4 C | +0.93 C |
The annual mean temperature here has risen by 0.4 C (0.3 to 0.5) per decade over 1961 to 2020. In Fahrenheit: 0.7 F (0.5 to 0.9) per decade. The slope is a straight line fitted to 44 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.4 C (0.3 to 0.5) per decade | 0.7 F (0.5 to 0.9) per decade | 1961 to 2020 | 44 | Rise |
| Mean daily maximum | 0.4 C (0.3 to 0.5) per decade | 0.7 F (0.5 to 0.9) per decade | 1961 to 2020 | 44 | Rise |
| Mean daily minimum | 0.4 C (0.3 to 0.5) per decade | 0.7 F (0.5 to 1.0) per decade | 1961 to 2020 | 44 | Rise |
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
1959 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 33.6 C (92.5 F) | 2022 | 25.4 C (77.6 F) | 68 |
| Coldest night (TNn) | -17.2 C (1.0 F) | 1965 | -10.0 C (14.0 F) | 66 |
| Wettest day (Rx1day) | 80.0 mm (3.1 in) | 1976 | 44.0 mm (1.7 in) | 66 |
| Wettest five days (Rx5day) | 165.5 mm (6.5 in) | 2000 | 87.2 mm (3.4 in) | 66 |
| Longest dry spell (CDD) | 29 days | 1989 | 17 days | 66 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1959 | 11.7 C (53.1 F) |
| 1960 | 29.4 C (84.9 F) |
| 1961 | 27.8 C (82.0 F) |
| 1962 | 21.1 C (70.0 F) |
| 1963 | 24.4 C (75.9 F) |
| 1964 | 22.8 C (73.0 F) |
| 1965 | 23.9 C (75.0 F) |
| 1966 | 22.8 C (73.0 F) |
| 1967 | 23.9 C (75.0 F) |
| 1968 | 24.4 C (75.9 F) |
| 1969 | 26.1 C (79.0 F) |
| 1970 | 26.1 C (79.0 F) |
| 1971 | 24.4 C (75.9 F) |
| 1972 | 24.7 C (76.5 F) |
| 1973 | 25.3 C (77.5 F) |
| 1974 | 23.0 C (73.4 F) |
| 1975 | 28.5 C (83.3 F) |
| 1976 | 30.0 C (86.0 F) |
| 1977 | 26.0 C (78.8 F) |
| 1978 | 24.3 C (75.7 F) |
| 1979 | 24.5 C (76.1 F) |
| 1980 | 25.7 C (78.3 F) |
| 1981 | 23.5 C (74.3 F) |
| 1982 | 25.0 C (77.0 F) |
| 1983 | 29.3 C (84.7 F) |
| 1984 | 27.0 C (80.6 F) |
| 1985 | 24.5 C (76.1 F) |
| 1986 | 26.4 C (79.5 F) |
| 1987 | 25.4 C (77.7 F) |
| 1988 | 25.0 C (77.0 F) |
| 1989 | 27.6 C (81.7 F) |
| 1990 | 30.8 C (87.4 F) |
| 1991 | 24.4 C (75.9 F) |
| 1992 | 24.1 C (75.4 F) |
| 1993 | 24.3 C (75.7 F) |
| 1994 | 23.9 C (75.0 F) |
| 1995 | 28.3 C (82.9 F) |
| 1996 | 25.1 C (77.2 F) |
| 1997 | 26.6 C (79.9 F) |
| 1998 | 24.2 C (75.6 F) |
| 1999 | 28.0 C (82.4 F) |
| 2000 | 27.0 C (80.6 F) |
| 2001 | 26.6 C (79.9 F) |
| 2002 | 24.0 C (75.2 F) |
| 2003 | 30.5 C (86.9 F) |
| 2004 | 24.5 C (76.1 F) |
| 2005 | 27.1 C (80.8 F) |
| 2006 | 31.4 C (88.5 F) |
| 2007 | 23.5 C (74.3 F) |
| 2008 | 25.0 C (77.0 F) |
| 2009 | 26.5 C (79.7 F) |
| 2010 | 24.2 C (75.6 F) |
| 2011 | 25.0 C (77.0 F) |
| 2012 | 24.2 C (75.6 F) |
| 2013 | 28.0 C (82.4 F) |
| 2014 | 29.0 C (84.2 F) |
| 2015 | 26.3 C (79.3 F) |
| 2016 | 29.0 C (84.2 F) |
| 2017 | 25.5 C (77.9 F) |
| 2018 | 27.6 C (81.7 F) |
| 2019 | 28.7 C (83.7 F) |
| 2020 | 29.2 C (84.6 F) |
| 2021 | 28.1 C (82.6 F) |
| 2022 | 33.6 C (92.5 F) |
| 2023 | 23.2 C (73.8 F) |
| 2024 | 5.0 C (41.0 F) |
| 2025 | 28.3 C (82.9 F) |
| 2026 | 19.7 C (67.5 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1959 | n/a |
| 1960 | -11.1 C (12.0 F) |
| 1961 | -16.1 C (3.0 F) |
| 1962 | -16.7 C (1.9 F) |
| 1963 | -16.1 C (3.0 F) |
| 1964 | -14.4 C (6.1 F) |
| 1965 | -17.2 C (1.0 F) |
| 1966 | -9.4 C (15.1 F) |
| 1967 | -11.1 C (12.0 F) |
| 1968 | -13.3 C (8.1 F) |
| 1969 | -16.7 C (1.9 F) |
| 1970 | -16.7 C (1.9 F) |
| 1971 | -12.2 C (10.0 F) |
| 1972 | -6.5 C (20.3 F) |
| 1973 | -13.0 C (8.6 F) |
| 1974 | -6.2 C (20.8 F) |
| 1975 | -6.5 C (20.3 F) |
| 1976 | -10.5 C (13.1 F) |
| 1977 | -10.4 C (13.3 F) |
| 1978 | -11.5 C (11.3 F) |
| 1979 | -13.1 C (8.4 F) |
| 1980 | -10.8 C (12.6 F) |
| 1981 | -16.8 C (1.8 F) |
| 1982 | -15.0 C (5.0 F) |
| 1983 | -8.5 C (16.7 F) |
| 1984 | -9.4 C (15.1 F) |
| 1985 | -11.8 C (10.8 F) |
| 1986 | -14.5 C (5.9 F) |
| 1987 | -11.7 C (10.9 F) |
| 1988 | -6.0 C (21.2 F) |
| 1989 | -9.5 C (14.9 F) |
| 1990 | -5.5 C (22.1 F) |
| 1991 | -10.6 C (12.9 F) |
| 1992 | -10.2 C (13.6 F) |
| 1993 | -9.7 C (14.5 F) |
| 1994 | -8.2 C (17.2 F) |
| 1995 | -11.3 C (11.7 F) |
| 1996 | -8.5 C (16.7 F) |
| 1997 | -6.7 C (19.9 F) |
| 1998 | -6.5 C (20.3 F) |
| 1999 | -8.7 C (16.3 F) |
| 2000 | -10.0 C (14.0 F) |
| 2001 | -11.8 C (10.8 F) |
| 2002 | -10.0 C (14.0 F) |
| 2003 | -10.2 C (13.6 F) |
| 2004 | -3.9 C (25.0 F) |
| 2005 | -9.5 C (14.9 F) |
| 2006 | -11.0 C (12.2 F) |
| 2007 | -7.3 C (18.9 F) |
| 2008 | -9.2 C (15.4 F) |
| 2009 | -12.4 C (9.7 F) |
| 2010 | -14.3 C (6.3 F) |
| 2011 | -9.2 C (15.4 F) |
| 2012 | -10.0 C (14.0 F) |
| 2013 | -7.5 C (18.5 F) |
| 2014 | -5.5 C (22.1 F) |
| 2015 | -7.5 C (18.5 F) |
| 2016 | -6.0 C (21.2 F) |
| 2017 | -6.5 C (20.3 F) |
| 2018 | -8.9 C (16.0 F) |
| 2019 | -8.8 C (16.2 F) |
| 2020 | -4.7 C (23.5 F) |
| 2021 | -8.5 C (16.7 F) |
| 2022 | -12.6 C (9.3 F) |
| 2023 | -4.8 C (23.4 F) |
| 2024 | n/a |
| 2025 | -9.5 C (14.9 F) |
| 2026 | -7.0 C (19.4 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1959 | n/a |
| 1960 | n/a |
| 1961 | 36.8 mm (1.4 in) |
| 1962 | 42.9 mm (1.7 in) |
| 1963 | 31.8 mm (1.3 in) |
| 1964 | 63.8 mm (2.5 in) |
| 1965 | 37.6 mm (1.5 in) |
| 1966 | 46.2 mm (1.8 in) |
| 1967 | 41.4 mm (1.6 in) |
| 1968 | 44.2 mm (1.7 in) |
| 1969 | 38.6 mm (1.5 in) |
| 1970 | 49.5 mm (1.9 in) |
| 1971 | 52.4 mm (2.1 in) |
| 1972 | 62.0 mm (2.4 in) |
| 1973 | 53.5 mm (2.1 in) |
| 1974 | 32.5 mm (1.3 in) |
| 1975 | 32.6 mm (1.3 in) |
| 1976 | 80.0 mm (3.1 in) |
| 1977 | 46.5 mm (1.8 in) |
| 1978 | 32.4 mm (1.3 in) |
| 1979 | 42.5 mm (1.7 in) |
| 1980 | 34.3 mm (1.4 in) |
| 1981 | 43.3 mm (1.7 in) |
| 1982 | 46.8 mm (1.8 in) |
| 1983 | 63.6 mm (2.5 in) |
| 1984 | 41.6 mm (1.6 in) |
| 1985 | 30.3 mm (1.2 in) |
| 1986 | 72.1 mm (2.8 in) |
| 1987 | 47.0 mm (1.9 in) |
| 1988 | 29.9 mm (1.2 in) |
| 1989 | 40.4 mm (1.6 in) |
| 1990 | 44.5 mm (1.8 in) |
| 1991 | 54.2 mm (2.1 in) |
| 1992 | 32.9 mm (1.3 in) |
| 1993 | 48.2 mm (1.9 in) |
| 1994 | 45.3 mm (1.8 in) |
| 1995 | 42.9 mm (1.7 in) |
| 1996 | 36.0 mm (1.4 in) |
| 1997 | 51.5 mm (2.0 in) |
| 1998 | 38.8 mm (1.5 in) |
| 1999 | 51.3 mm (2.0 in) |
| 2000 | 64.5 mm (2.5 in) |
| 2001 | 29.4 mm (1.2 in) |
| 2002 | 39.7 mm (1.6 in) |
| 2003 | 29.1 mm (1.1 in) |
| 2004 | 43.3 mm (1.7 in) |
| 2005 | 43.8 mm (1.7 in) |
| 2006 | 46.7 mm (1.8 in) |
| 2007 | 60.0 mm (2.4 in) |
| 2008 | 53.8 mm (2.1 in) |
| 2009 | 46.9 mm (1.8 in) |
| 2010 | 36.3 mm (1.4 in) |
| 2011 | 50.3 mm (2.0 in) |
| 2012 | 72.4 mm (2.9 in) |
| 2013 | 37.7 mm (1.5 in) |
| 2014 | 35.0 mm (1.4 in) |
| 2015 | 64.4 mm (2.5 in) |
| 2016 | 37.6 mm (1.5 in) |
| 2017 | 28.8 mm (1.1 in) |
| 2018 | 53.2 mm (2.1 in) |
| 2019 | 55.1 mm (2.2 in) |
| 2020 | 65.3 mm (2.6 in) |
| 2021 | 49.6 mm (2.0 in) |
| 2022 | 44.6 mm (1.8 in) |
| 2023 | 47.0 mm (1.9 in) |
| 2024 | 33.4 mm (1.3 in) |
| 2025 | 40.8 mm (1.6 in) |
| 2026 | 20.5 mm (0.8 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1959 | n/a |
| 1960 | n/a |
| 1961 | 82.5 mm (3.2 in) |
| 1962 | 75.9 mm (3.0 in) |
| 1963 | 68.4 mm (2.7 in) |
| 1964 | 125.0 mm (4.9 in) |
| 1965 | 105.7 mm (4.2 in) |
| 1966 | 103.4 mm (4.1 in) |
| 1967 | 78.3 mm (3.1 in) |
| 1968 | 116.1 mm (4.6 in) |
| 1969 | 80.0 mm (3.1 in) |
| 1970 | 71.1 mm (2.8 in) |
| 1971 | 86.7 mm (3.4 in) |
| 1972 | 114.6 mm (4.5 in) |
| 1973 | 78.2 mm (3.1 in) |
| 1974 | 78.3 mm (3.1 in) |
| 1975 | 61.7 mm (2.4 in) |
| 1976 | 143.6 mm (5.7 in) |
| 1977 | 87.0 mm (3.4 in) |
| 1978 | 91.5 mm (3.6 in) |
| 1979 | 80.5 mm (3.2 in) |
| 1980 | 63.0 mm (2.5 in) |
| 1981 | 91.8 mm (3.6 in) |
| 1982 | 94.8 mm (3.7 in) |
| 1983 | 83.6 mm (3.3 in) |
| 1984 | 81.3 mm (3.2 in) |
| 1985 | 73.9 mm (2.9 in) |
| 1986 | 131.7 mm (5.2 in) |
| 1987 | 134.9 mm (5.3 in) |
| 1988 | 76.6 mm (3.0 in) |
| 1989 | 86.0 mm (3.4 in) |
| 1990 | 102.0 mm (4.0 in) |
| 1991 | 118.8 mm (4.7 in) |
| 1992 | 81.7 mm (3.2 in) |
| 1993 | 97.7 mm (3.8 in) |
| 1994 | 105.8 mm (4.2 in) |
| 1995 | 71.0 mm (2.8 in) |
| 1996 | 75.9 mm (3.0 in) |
| 1997 | 84.5 mm (3.3 in) |
| 1998 | 107.3 mm (4.2 in) |
| 1999 | 111.4 mm (4.4 in) |
| 2000 | 165.5 mm (6.5 in) |
| 2001 | 68.9 mm (2.7 in) |
| 2002 | 103.7 mm (4.1 in) |
| 2003 | 71.7 mm (2.8 in) |
| 2004 | 116.2 mm (4.6 in) |
| 2005 | 78.8 mm (3.1 in) |
| 2006 | 121.1 mm (4.8 in) |
| 2007 | 117.0 mm (4.6 in) |
| 2008 | 122.8 mm (4.8 in) |
| 2009 | 105.0 mm (4.1 in) |
| 2010 | 74.7 mm (2.9 in) |
| 2011 | 100.6 mm (4.0 in) |
| 2012 | 131.5 mm (5.2 in) |
| 2013 | 86.0 mm (3.4 in) |
| 2014 | 78.3 mm (3.1 in) |
| 2015 | 122.7 mm (4.8 in) |
| 2016 | 71.8 mm (2.8 in) |
| 2017 | 68.9 mm (2.7 in) |
| 2018 | 98.4 mm (3.9 in) |
| 2019 | 110.2 mm (4.3 in) |
| 2020 | 99.6 mm (3.9 in) |
| 2021 | 95.7 mm (3.8 in) |
| 2022 | 87.4 mm (3.4 in) |
| 2023 | 97.5 mm (3.8 in) |
| 2024 | 61.0 mm (2.4 in) |
| 2025 | 75.6 mm (3.0 in) |
| 2026 | 54.7 mm (2.2 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1959 | n/a |
| 1960 | n/a |
| 1961 | 16 days |
| 1962 | 19 days |
| 1963 | 25 days |
| 1964 | 17 days |
| 1965 | 18 days |
| 1966 | 15 days |
| 1967 | 13 days |
| 1968 | 21 days |
| 1969 | 14 days |
| 1970 | 12 days |
| 1971 | 17 days |
| 1972 | 24 days |
| 1973 | 17 days |
| 1974 | 20 days |
| 1975 | 17 days |
| 1976 | 24 days |
| 1977 | 20 days |
| 1978 | 17 days |
| 1979 | 27 days |
| 1980 | 12 days |
| 1981 | 15 days |
| 1982 | 19 days |
| 1983 | 16 days |
| 1984 | 15 days |
| 1985 | 21 days |
| 1986 | 27 days |
| 1987 | 13 days |
| 1988 | 16 days |
| 1989 | 29 days |
| 1990 | 13 days |
| 1991 | 21 days |
| 1992 | 19 days |
| 1993 | 14 days |
| 1994 | 11 days |
| 1995 | 20 days |
| 1996 | 16 days |
| 1997 | 27 days |
| 1998 | 10 days |
| 1999 | 10 days |
| 2000 | 17 days |
| 2001 | 12 days |
| 2002 | 15 days |
| 2003 | 19 days |
| 2004 | 19 days |
| 2005 | 18 days |
| 2006 | 12 days |
| 2007 | 23 days |
| 2008 | 14 days |
| 2009 | 20 days |
| 2010 | 24 days |
| 2011 | 23 days |
| 2012 | 15 days |
| 2013 | 20 days |
| 2014 | 23 days |
| 2015 | 17 days |
| 2016 | 15 days |
| 2017 | 11 days |
| 2018 | 21 days |
| 2019 | 19 days |
| 2020 | 14 days |
| 2021 | 17 days |
| 2022 | 17 days |
| 2023 | 12 days |
| 2024 | 9 days |
| 2025 | 11 days |
| 2026 | 13 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
44 years with a frostAcross 44 years with a frost, the median last spring frost at Alwen falls on 28 May and the median first autumn frost on 11 October, which leaves a median of 133 days between them.
Fitted over all years, the growing season changes by +21.6 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1978 to 2020) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 28 May | n/a | 22 May | n/a | -5.3 days per decade |
| First autumn frost | 11 October | n/a | 17 October | n/a | +16.3 days per decade |
| Growing days | 133 days | n/a | 148 days | n/a | +21.6 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
62 years, 1961 to 2022A day with at least 44.2 mm (1.7 in) of rain is expected about once in 2 years. A day with at least 82.6 mm (3.3 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 44.2 mm (1.7 in) | |
| 5 years | 54.9 mm (2.2 in) | |
| 10 years | 61.8 mm (2.4 in) | |
| 25 years | 70.4 mm (2.8 in) | |
| 50 years | 76.6 mm (3.0 in) | |
| 100 years | 82.6 mm (3.3 in) | Longer than the 62 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, 62 years of values from 1961 to 2022.
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: 80.0 mm (3.1 in) in 1976; 72.4 mm (2.9 in) in 2012; 72.1 mm (2.8 in) in 1986.
Station Changes
1 suspectedOne change was suspected in the annual mean temperature of Alwen, at 1980. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1980 ran 0.2 C (0.4 F) higher than in the years before (likely change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1980 | +0.2 | +0.4 | likely | 5 |
Possible change at the station (a move, a new instrument or a new site); the record is kept as measured. A "likely" change has a larger test statistic than a "possible" one. Neither says why the station differs from its neighbours. How changes are found, and the largest ones.
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). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-12).