Norderon Weather Records (SWE00139970)
Record envelope, standing records and threshold days for Norderon (SWE00139970), Sweden, with 71 years of record.
Key Facts for Norderon
- Norderon (SWE00139970) is a weather station in Sweden at 63.15 latitude and 14.37 longitude, 320 m (1,050 ft) above sea level.
- The station reports from 1956 to 2026, 71 years of record.
- 1,464 records set at Norderon still stand.
- Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
- Norderon set a daily record high minimum temperature of 12.8 C (55.0 F) on 30 August 2026 (provisional).
Provisional Records
Records set in the last 60 days are provisional until they clear the revision window.
About the Station
- Location: Sweden, 63.15 latitude, 14.37 longitude.
- Elevation: 320 m (1,050 ft).
- Period of record: 1956 to 2026, 71 years.
- Eligible elements: tmax, tmin, prcp.
Daily Record Envelope and 2026
3 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 11.3 C (52.3 F) | -37.8 C (-36.0 F) | 3.2 C (37.8 F) | -25.8 C (-14.4 F) |
| Feb | 10.3 C (50.5 F) | -40.2 C (-40.4 F) | 3.0 C (37.4 F) | -28.1 C (-18.6 F) |
| Mar | 13.1 C (55.6 F) | -33.6 C (-28.5 F) | 10.0 C (50.0 F) | -16.1 C (3.0 F) |
| Apr | 20.9 C (69.6 F) | -19.4 C (-2.9 F) | 15.2 C (59.4 F) | -7.3 C (18.9 F) |
| May | 26.8 C (80.2 F) | -7.5 C (18.5 F) | 20.7 C (69.3 F) | -2.4 C (27.7 F) |
| Jun | 30.0 C (86.0 F) | -1.6 C (29.1 F) | 24.5 C (76.1 F) | 6.6 C (43.9 F) |
| Jul | 31.6 C (88.9 F) | 0.5 C (32.9 F) | 27.2 C (81.0 F) | 6.2 C (43.2 F) |
| Aug | 29.9 C (85.8 F) | 0.0 C (32.0 F) | 20.4 C (68.7 F) | 6.6 C (43.9 F) |
| Sep | 23.9 C (75.0 F) | -4.5 C (23.9 F) | n/a | n/a |
| Oct | 21.6 C (70.9 F) | -10.4 C (13.3 F) | n/a | n/a |
| Nov | 13.4 C (56.1 F) | -23.4 C (-10.1 F) | n/a | n/a |
| Dec | 10.2 C (50.4 F) | -34.9 C (-30.8 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1956 | 17 |
| 1957 | 25 |
| 1961 | 49 |
| 1962 | 41 |
| 1963 | 23 |
| 1964 | 36 |
| 1965 | 43 |
| 1966 | 69 |
| 1967 | 39 |
| 1968 | 74 |
| 1969 | 51 |
| 1970 | 38 |
| 1971 | 44 |
| 1972 | 30 |
| 1973 | 55 |
| 1974 | 22 |
| 1975 | 38 |
| 1976 | 40 |
| 1977 | 40 |
| 1978 | 10 |
| 2006 | 7 |
| 2007 | 28 |
| 2008 | 19 |
| 2009 | 33 |
| 2010 | 43 |
| 2011 | 37 |
| 2012 | 22 |
| 2013 | 28 |
| 2014 | 40 |
| 2015 | 24 |
| 2016 | 22 |
| 2017 | 20 |
| 2018 | 53 |
| 2019 | 34 |
| 2020 | 41 |
| 2021 | 27 |
| 2022 | 26 |
| 2023 | 45 |
| 2024 | 60 |
| 2025 | 59 |
| 2026 | 12 |
Wettest Day of Each Month
Jul: 56.7 mm (2.2 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 36.8 mm (1.4 in) | 13 January 2022 |
| Feb | 25.0 mm (1.0 in) | 28 February 1975 |
| Mar | 21.1 mm (0.8 in) | 11 March 1961 |
| Apr | 30.6 mm (1.2 in) | 17 April 1973 |
| May | 36.2 mm (1.4 in) | 23 May 2025 |
| Jun | 34.7 mm (1.4 in) | 9 June 2024 |
| Jul | 56.7 mm (2.2 in) | 20 July 2009 |
| Aug | 49.4 mm (1.9 in) | 7 August 2023 |
| Sep | 29.4 mm (1.2 in) | 25 September 2024 |
| Oct | 23.6 mm (0.9 in) | 10 October 2021 |
| Nov | 22.3 mm (0.9 in) | 18 November 2020 |
| Dec | 23.9 mm (0.9 in) | 13 December 1973 |
Period of Record Coverage
1956 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1956 | 151 | 41% | No |
| 1957 | 212 | 58% | No |
| 1961 | 365 | 100% | Yes |
| 1962 | 365 | 100% | Yes |
| 1963 | 364 | 100% | Yes |
| 1964 | 362 | 99% | Yes |
| 1965 | 365 | 100% | Yes |
| 1966 | 363 | 99% | Yes |
| 1967 | 365 | 100% | Yes |
| 1968 | 366 | 100% | Yes |
| 1969 | 365 | 100% | Yes |
| 1970 | 365 | 100% | Yes |
| 1971 | 365 | 100% | Yes |
| 1972 | 366 | 100% | Yes |
| 1973 | 365 | 100% | Yes |
| 1974 | 365 | 100% | Yes |
| 1975 | 365 | 100% | Yes |
| 1976 | 365 | 100% | Yes |
| 1977 | 364 | 100% | Yes |
| 1978 | 59 | 16% | No |
| 2006 | 17 | 5% | No |
| 2007 | 329 | 90% | Yes |
| 2008 | 344 | 94% | Yes |
| 2009 | 320 | 88% | No |
| 2010 | 351 | 96% | Yes |
| 2011 | 310 | 85% | No |
| 2012 | 341 | 93% | Yes |
| 2013 | 343 | 94% | Yes |
| 2014 | 350 | 96% | Yes |
| 2015 | 344 | 94% | Yes |
| 2016 | 339 | 93% | Yes |
| 2017 | 355 | 97% | Yes |
| 2018 | 346 | 95% | Yes |
| 2019 | 341 | 93% | Yes |
| 2020 | 359 | 98% | Yes |
| 2021 | 359 | 98% | Yes |
| 2022 | 355 | 97% | Yes |
| 2023 | 365 | 100% | Yes |
| 2024 | 366 | 100% | Yes |
| 2025 | 358 | 98% | Yes |
| 2026 | 213 | 58% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 30 August 2026 | Norderon, SE | daily high min (Provisional) | 12.8 C (55.0 F) | 0.8 C (1.4 F) | 1 year | 9 of 100 (Routine) |
| 10 August 2026 | Norderon, SE | daily rain | 16.4 mm (0.6 in) | 3.9 mm (0.15 in) | 60 years | 20 of 100 (Routine) |
| 6 August 2026 | Norderon, SE | daily low max | 13.0 C (55.4 F) | 0.7 C (1.3 F) | 52 years | 23 of 100 (Routine) |
| 6 August 2026 | Norderon, SE | daily rain | 21.4 mm (0.8 in) | 3.4 mm (0.13 in) | 12 years | 15 of 100 (Routine) |
| 5 August 2026 | Norderon, SE | daily rain | 19.8 mm (0.8 in) | 5.8 mm (0.23 in) | 15 years | 19 of 100 (Routine) |
| 7 July 2026 | Norderon, SE | daily low max | 11.4 C (52.5 F) | 0.6 C (1.1 F) | 11 years | 11 of 100 (Routine) |
| 7 June 2026 | Norderon, SE | daily rain | 13.0 mm (0.5 in) | 1.0 mm (0.04 in) | 0 years | 8 of 100 (Routine) |
| 6 June 2026 | Norderon, SE | daily rain | 17.0 mm (0.7 in) | 1.0 mm (0.04 in) | 0 years | 8 of 100 (Routine) |
| 10 May 2026 | Norderon, SE | daily rain | 10.1 mm (0.4 in) | 5.1 mm (0.20 in) | 13 years | 20 of 100 (Routine) |
| 30 April 2026 | Norderon, SE | daily high min | 5.8 C (42.4 F) | 0.2 C (0.4 F) | 7 years | 9 of 100 (Routine) |
| 1 April 2026 | Norderon, SE | daily high max | 11.5 C (52.7 F) | 0.1 C (0.2 F) | 52 years | 22 of 100 (Routine) |
| 1 April 2026 | Norderon, SE | daily high min | 1.6 C (34.9 F) | 0.4 C (0.7 F) | 0 years | 7 of 100 (Routine) |
| 19 March 2026 | Norderon, SE | daily high min | 1.7 C (35.1 F) | 1.4 C (2.5 F) | 0 years | 9 of 100 (Routine) |
| 4 March 2026 | Norderon, SE | daily high min | 1.6 C (34.9 F) | 0.4 C (0.7 F) | 64 years | 26 of 100 (Routine) |
| 3 March 2026 | Norderon, SE | daily high max | 6.9 C (44.4 F) | 0.3 C (0.5 F) | 15 years | 11 of 100 (Routine) |
| 7 February 2026 | Norderon, SE | daily low max | -17.5 C (0.5 F) | 0.3 C (0.5 F) | 19 years | 12 of 100 (Routine) |
| 6 February 2026 | Norderon, SE | daily low max | -20.2 C (-4.4 F) | 4.7 C (8.5 F) | 60 years | 32 of 100 (Routine) |
| 6 February 2026 | Norderon, SE | daily low min | -25.7 C (-14.3 F) | 2.6 C (4.7 F) | 63 years | 28 of 100 (Routine) |
| 5 February 2026 | Norderon, SE | daily low max | -21.7 C (-7.1 F) | 0.9 C (1.6 F) | 14 years | 12 of 100 (Routine) |
| 14 January 2026 | Norderon, SE | daily rain | 6.5 mm (0.26 in) | 0.7 mm (0.03 in) | 56 years | 20 of 100 (Routine) |
Climate Trend
27 complete years, 1961 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1961 | 3.8 C | +0.44 C |
| 1962 | 1.7 C | -1.69 C |
| 1963 | 2.9 C | -0.49 C |
| 1964 | 3.6 C | +0.17 C |
| 1965 | 2.3 C | -1.09 C |
| 1966 | 0.8 C | -2.63 C |
| 1967 | 2.9 C | -0.54 C |
| 1968 | 1.8 C | -1.63 C |
| 1969 | 1.9 C | -1.50 C |
| 1970 | 1.9 C | -1.53 C |
| 1971 | 3.1 C | -0.33 C |
| 1972 | 3.6 C | +0.19 C |
| 1973 | 3.5 C | +0.12 C |
| 1974 | 3.6 C | +0.15 C |
| 1975 | 4.4 C | +1.04 C |
| 1976 | 2.1 C | -1.34 C |
| 1977 | 2.0 C | -1.38 C |
| 2008 | 4.2 C | +0.76 C |
| 2014 | 5.4 C | +1.97 C |
| 2016 | 4.3 C | +0.86 C |
| 2017 | 4.0 C | +0.55 C |
| 2020 | 5.8 C | +2.36 C |
| 2021 | 3.7 C | +0.29 C |
| 2022 | 4.7 C | +1.32 C |
| 2023 | 3.3 C | -0.06 C |
| 2024 | 5.0 C | +1.62 C |
| 2025 | 5.8 C | +2.39 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
1956 to 2026| Measure | Record | Year of the record | Median year | Years with a value |
|---|---|---|---|---|
| Hottest day (TXx) | 31.6 C (88.9 F) | 2018 | 27.6 C (81.7 F) | 41 |
| Coldest night (TNn) | -40.2 C (-40.4 F) | 1966 | -28.3 C (-18.9 F) | 41 |
| Wettest day (Rx1day) | 56.7 mm (2.2 in) | 2009 | 27.0 mm (1.1 in) | 41 |
| Wettest five days (Rx5day) | 91.6 mm (3.6 in) | 1966 | 48.2 mm (1.9 in) | 41 |
| Longest dry spell (CDD) | 53 days | 1964 | 22 days | 41 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1956 | 19.0 C (66.2 F) |
| 1957 | 27.0 C (80.6 F) |
| 1961 | 29.2 C (84.6 F) |
| 1962 | 23.4 C (74.1 F) |
| 1963 | 25.5 C (77.9 F) |
| 1964 | 27.4 C (81.3 F) |
| 1965 | 27.6 C (81.7 F) |
| 1966 | 29.4 C (84.9 F) |
| 1967 | 26.4 C (79.5 F) |
| 1968 | 31.4 C (88.5 F) |
| 1969 | 28.9 C (84.0 F) |
| 1970 | 27.6 C (81.7 F) |
| 1971 | 27.3 C (81.1 F) |
| 1972 | 29.6 C (85.3 F) |
| 1973 | 28.6 C (83.5 F) |
| 1974 | 27.6 C (81.7 F) |
| 1975 | 29.9 C (85.8 F) |
| 1976 | 25.6 C (78.1 F) |
| 1977 | 27.3 C (81.1 F) |
| 1978 | 7.6 C (45.7 F) |
| 2006 | 8.2 C (46.8 F) |
| 2007 | 28.2 C (82.8 F) |
| 2008 | 29.0 C (84.2 F) |
| 2009 | 27.0 C (80.6 F) |
| 2010 | 27.1 C (80.8 F) |
| 2011 | 28.0 C (82.4 F) |
| 2012 | 25.7 C (78.3 F) |
| 2013 | 26.4 C (79.5 F) |
| 2014 | 29.2 C (84.6 F) |
| 2015 | 29.5 C (85.1 F) |
| 2016 | 27.5 C (81.5 F) |
| 2017 | 24.2 C (75.6 F) |
| 2018 | 31.6 C (88.9 F) |
| 2019 | 31.5 C (88.7 F) |
| 2020 | 30.0 C (86.0 F) |
| 2021 | 29.9 C (85.8 F) |
| 2022 | 29.7 C (85.5 F) |
| 2023 | 28.0 C (82.4 F) |
| 2024 | 29.5 C (85.1 F) |
| 2025 | 29.7 C (85.5 F) |
| 2026 | 27.2 C (81.0 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1956 | -25.4 C (-13.7 F) |
| 1957 | -30.5 C (-22.9 F) |
| 1961 | -29.6 C (-21.3 F) |
| 1962 | -30.6 C (-23.1 F) |
| 1963 | -32.1 C (-25.8 F) |
| 1964 | -27.3 C (-17.1 F) |
| 1965 | -34.6 C (-30.3 F) |
| 1966 | -40.2 C (-40.4 F) |
| 1967 | -33.4 C (-28.1 F) |
| 1968 | -31.2 C (-24.2 F) |
| 1969 | -34.9 C (-30.8 F) |
| 1970 | -34.4 C (-29.9 F) |
| 1971 | -33.6 C (-28.5 F) |
| 1972 | -26.8 C (-16.2 F) |
| 1973 | -31.3 C (-24.3 F) |
| 1974 | -28.3 C (-18.9 F) |
| 1975 | -24.3 C (-11.7 F) |
| 1976 | -32.3 C (-26.1 F) |
| 1977 | -34.7 C (-30.5 F) |
| 1978 | -35.1 C (-31.2 F) |
| 2006 | -3.8 C (25.2 F) |
| 2007 | -28.3 C (-18.9 F) |
| 2008 | -24.8 C (-12.6 F) |
| 2009 | -29.4 C (-20.9 F) |
| 2010 | -34.9 C (-30.8 F) |
| 2011 | -24.3 C (-11.7 F) |
| 2012 | -31.5 C (-24.7 F) |
| 2013 | -25.9 C (-14.6 F) |
| 2014 | -17.4 C (0.7 F) |
| 2015 | -25.2 C (-13.4 F) |
| 2016 | -27.2 C (-17.0 F) |
| 2017 | -22.6 C (-8.7 F) |
| 2018 | -30.8 C (-23.4 F) |
| 2019 | -25.5 C (-13.9 F) |
| 2020 | -16.0 C (3.2 F) |
| 2021 | -26.5 C (-15.7 F) |
| 2022 | -24.1 C (-11.4 F) |
| 2023 | -22.7 C (-8.9 F) |
| 2024 | -30.9 C (-23.6 F) |
| 2025 | -18.2 C (-0.8 F) |
| 2026 | -28.1 C (-18.6 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1956 | 31.0 mm (1.2 in) |
| 1957 | 18.2 mm (0.7 in) |
| 1961 | 27.9 mm (1.1 in) |
| 1962 | 25.0 mm (1.0 in) |
| 1963 | 26.3 mm (1.0 in) |
| 1964 | 27.0 mm (1.1 in) |
| 1965 | 21.1 mm (0.8 in) |
| 1966 | 46.6 mm (1.8 in) |
| 1967 | 35.3 mm (1.4 in) |
| 1968 | 17.2 mm (0.7 in) |
| 1969 | 20.9 mm (0.8 in) |
| 1970 | 26.6 mm (1.0 in) |
| 1971 | 23.0 mm (0.9 in) |
| 1972 | 25.0 mm (1.0 in) |
| 1973 | 30.6 mm (1.2 in) |
| 1974 | 32.2 mm (1.3 in) |
| 1975 | 28.3 mm (1.1 in) |
| 1976 | 29.6 mm (1.2 in) |
| 1977 | 23.4 mm (0.9 in) |
| 1978 | 19.5 mm (0.8 in) |
| 2006 | 7.1 mm (0.28 in) |
| 2007 | 19.3 mm (0.8 in) |
| 2008 | 24.6 mm (1.0 in) |
| 2009 | 56.7 mm (2.2 in) |
| 2010 | 32.7 mm (1.3 in) |
| 2011 | 27.4 mm (1.1 in) |
| 2012 | 22.0 mm (0.9 in) |
| 2013 | 37.7 mm (1.5 in) |
| 2014 | 35.0 mm (1.4 in) |
| 2015 | 31.1 mm (1.2 in) |
| 2016 | 22.0 mm (0.9 in) |
| 2017 | 38.6 mm (1.5 in) |
| 2018 | 24.5 mm (1.0 in) |
| 2019 | 22.4 mm (0.9 in) |
| 2020 | 22.3 mm (0.9 in) |
| 2021 | 29.1 mm (1.1 in) |
| 2022 | 36.8 mm (1.4 in) |
| 2023 | 49.4 mm (1.9 in) |
| 2024 | 34.7 mm (1.4 in) |
| 2025 | 41.0 mm (1.6 in) |
| 2026 | 25.1 mm (1.0 in) |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1956 | 50.0 mm (2.0 in) |
| 1957 | 49.8 mm (2.0 in) |
| 1961 | 62.0 mm (2.4 in) |
| 1962 | 69.2 mm (2.7 in) |
| 1963 | 44.2 mm (1.7 in) |
| 1964 | 55.3 mm (2.2 in) |
| 1965 | 46.9 mm (1.8 in) |
| 1966 | 91.6 mm (3.6 in) |
| 1967 | 46.1 mm (1.8 in) |
| 1968 | 33.1 mm (1.3 in) |
| 1969 | 36.0 mm (1.4 in) |
| 1970 | 54.6 mm (2.1 in) |
| 1971 | 47.0 mm (1.9 in) |
| 1972 | 47.9 mm (1.9 in) |
| 1973 | 58.2 mm (2.3 in) |
| 1974 | 43.4 mm (1.7 in) |
| 1975 | 42.1 mm (1.7 in) |
| 1976 | 33.2 mm (1.3 in) |
| 1977 | 50.8 mm (2.0 in) |
| 1978 | 33.6 mm (1.3 in) |
| 2006 | 11.0 mm (0.4 in) |
| 2007 | 36.0 mm (1.4 in) |
| 2008 | 64.4 mm (2.5 in) |
| 2009 | 86.1 mm (3.4 in) |
| 2010 | 68.8 mm (2.7 in) |
| 2011 | 48.2 mm (1.9 in) |
| 2012 | 40.6 mm (1.6 in) |
| 2013 | 48.1 mm (1.9 in) |
| 2014 | 57.4 mm (2.3 in) |
| 2015 | 62.2 mm (2.4 in) |
| 2016 | 43.9 mm (1.7 in) |
| 2017 | 46.7 mm (1.8 in) |
| 2018 | 43.9 mm (1.7 in) |
| 2019 | 33.8 mm (1.3 in) |
| 2020 | 38.3 mm (1.5 in) |
| 2021 | 69.0 mm (2.7 in) |
| 2022 | 51.3 mm (2.0 in) |
| 2023 | 69.6 mm (2.7 in) |
| 2024 | 55.7 mm (2.2 in) |
| 2025 | 68.4 mm (2.7 in) |
| 2026 | 59.6 mm (2.3 in) |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1956 | 15 days |
| 1957 | 16 days |
| 1961 | 21 days |
| 1962 | 24 days |
| 1963 | 20 days |
| 1964 | 53 days |
| 1965 | 28 days |
| 1966 | 28 days |
| 1967 | 15 days |
| 1968 | 19 days |
| 1969 | 20 days |
| 1970 | 20 days |
| 1971 | 21 days |
| 1972 | 22 days |
| 1973 | 17 days |
| 1974 | 22 days |
| 1975 | 22 days |
| 1976 | 31 days |
| 1977 | 20 days |
| 1978 | 10 days |
| 2006 | 2 days |
| 2007 | 30 days |
| 2008 | 27 days |
| 2009 | 22 days |
| 2010 | 25 days |
| 2011 | 35 days |
| 2012 | 22 days |
| 2013 | 25 days |
| 2014 | 27 days |
| 2015 | 22 days |
| 2016 | 31 days |
| 2017 | 27 days |
| 2018 | 19 days |
| 2019 | 20 days |
| 2020 | 21 days |
| 2021 | 20 days |
| 2022 | 36 days |
| 2023 | 27 days |
| 2024 | 19 days |
| 2025 | 18 days |
| 2026 | 33 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
27 years with a frostAcross 27 years with a frost, the median last spring frost at Norderon falls on 21 May and the median first autumn frost on 1 October, which leaves a median of 131 days between them.
Fitted over all years, the growing season changes by +6.4 days per decade at this station.
| Measure | Median, all years | Earliest period | Recent period (1961 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 21 May | n/a | 21 May | n/a | -3.2 days per decade |
| First autumn frost | 1 October | n/a | 1 October | n/a | +3.2 days per decade |
| Growing days | 131 days | n/a | 131 days | n/a | +6.4 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
35 years, 1961 to 2025A day with at least 28.0 mm (1.1 in) of rain is expected about once in 2 years. A day with at least 62.5 mm (2.5 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 28.0 mm (1.1 in) | |
| 5 years | 35.8 mm (1.4 in) | |
| 10 years | 41.5 mm (1.6 in) | |
| 25 years | 49.4 mm (1.9 in) | |
| 50 years | 55.7 mm (2.2 in) | Longer than the 35 years of record |
| 100 years | 62.5 mm (2.5 in) | Longer than the 35 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, 35 years of values from 1961 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: 56.7 mm (2.2 in) in 2009; 49.4 mm (1.9 in) in 2023; 46.6 mm (1.8 in) in 1966.
Climate Twins
1973 to 2025 against 1961 to 1990Over 1973 to 2025, Norderon had a mean temperature of 4.1 C (39.4 F) and 540.7 mm (21.3 in) of rain a year. The 3 stations whose 1961 to 1990 climate was closest to that are Soderhamn A (Sweden, 252 km away), Red Rvr (United States, 7,706 km away) and Allenspark 2SE (United States, 7,359 km away).
| Twin station | Country | Distance away | Mean temperature, 1961-1990 | Rain a year, 1961-1990 | Climate difference |
|---|---|---|---|---|---|
| Soderhamn A | Sweden | 252 km (157 mi) | 4.3 C (39.8 F) | 632.0 mm (24.9 in) | 0.62 |
| Red Rvr | United States | 7,706 km (4,788 mi) | 4.1 C (39.4 F) | 533.1 mm (21.0 in) | 0.76 |
| Allenspark 2SE | United States | 7,359 km (4,573 mi) | 4.6 C (40.2 F) | 515.9 mm (20.3 in) | 0.87 |
Twins are stations, not cities. A twin is one of the three stations at least 100 km away whose earlier climate is closest to this station's recent one, so a close match does not mean the two places look alike in other ways. A station move or a gap in a record can change that station's averages. The list describes past climate; it is not a forecast and does not say what caused any change. How twins are found, and a search for any station.
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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 (2026-10-17).