Mustasaari Valassaaret Weather Records (FIE00144222)
Record envelope, standing records and threshold days for Mustasaari Valassaaret (FIE00144222), Finland, with 68 years of record.
Key Facts for Mustasaari Valassaaret
- Mustasaari Valassaaret (FIE00144222) is a weather station in Finland at 63.44 latitude and 21.07 longitude, 4 m (13 ft) above sea level.
- The station reports from 1959 to 2026, 68 years of record.
- 1,464 records set at Mustasaari Valassaaret still stand.
- Records are tracked for tmax, tmin, prcp: an element needs 30 years of data to be eligible.
- Mustasaari Valassaaret set a daily record high minimum temperature of 13.3 C (55.9 F) on 5 June 2026.
About the Station
- Location: Finland, 63.44 latitude, 21.07 longitude.
- Elevation: 4 m (13 ft).
- Period of record: 1959 to 2026, 68 years.
- Eligible elements: tmax, tmin, prcp.
Daily Record Envelope and 2026
7 days at or beyond a record| Month | Highest record high | Lowest record low | 2026 highest maximum | 2026 lowest minimum |
|---|---|---|---|---|
| Jan | 8.1 C (46.6 F) | -27.8 C (-18.0 F) | 1.8 C (35.2 F) | -18.3 C (-0.9 F) |
| Feb | 7.0 C (44.6 F) | -28.7 C (-19.7 F) | 0.4 C (32.7 F) | -23.2 C (-9.8 F) |
| Mar | 11.3 C (52.3 F) | -28.2 C (-18.8 F) | 5.5 C (41.9 F) | -13.5 C (7.7 F) |
| Apr | 16.6 C (61.9 F) | -18.7 C (-1.7 F) | 13.1 C (55.6 F) | -2.1 C (28.2 F) |
| May | 22.6 C (72.7 F) | -5.0 C (23.0 F) | 17.5 C (63.5 F) | 2.1 C (35.8 F) |
| Jun | 26.6 C (79.9 F) | 1.5 C (34.7 F) | 22.5 C (72.5 F) | 6.7 C (44.1 F) |
| Jul | 31.4 C (88.5 F) | 6.4 C (43.5 F) | 22.3 C (72.1 F) | 10.1 C (50.2 F) |
| Aug | 31.3 C (88.3 F) | 4.8 C (40.6 F) | 20.0 C (68.0 F) | 10.0 C (50.0 F) |
| Sep | 24.5 C (76.1 F) | 0.5 C (32.9 F) | n/a | n/a |
| Oct | 15.5 C (59.9 F) | -8.0 C (17.6 F) | n/a | n/a |
| Nov | 11.9 C (53.4 F) | -15.6 C (3.9 F) | n/a | n/a |
| Dec | 7.0 C (44.6 F) | -25.9 C (-14.6 F) | n/a | n/a |
Which Years Hold Standing Records
1,464 standing records| Year set | Standing records |
|---|---|
| 1959 | 24 |
| 1960 | 19 |
| 1961 | 17 |
| 1962 | 30 |
| 1963 | 10 |
| 1964 | 7 |
| 1965 | 19 |
| 1966 | 77 |
| 1967 | 10 |
| 1968 | 19 |
| 1969 | 17 |
| 1970 | 10 |
| 1971 | 24 |
| 1972 | 19 |
| 1973 | 43 |
| 1974 | 9 |
| 1975 | 14 |
| 1976 | 29 |
| 1977 | 38 |
| 1978 | 56 |
| 1979 | 11 |
| 1980 | 6 |
| 1981 | 15 |
| 1982 | 10 |
| 1983 | 3 |
| 1984 | 14 |
| 1985 | 64 |
| 1986 | 29 |
| 1987 | 52 |
| 1988 | 2 |
| 1989 | 19 |
| 1990 | 17 |
| 1991 | 10 |
| 1992 | 36 |
| 1993 | 15 |
| 1994 | 9 |
| 1995 | 7 |
| 1996 | 4 |
| 1997 | 8 |
| 1998 | 13 |
| 1999 | 9 |
| 2000 | 24 |
| 2001 | 7 |
| 2002 | 40 |
| 2003 | 14 |
| 2004 | 4 |
| 2005 | 19 |
| 2006 | 23 |
| 2007 | 5 |
| 2008 | 9 |
| 2009 | 6 |
| 2010 | 5 |
| 2011 | 22 |
| 2012 | 2 |
| 2013 | 10 |
| 2014 | 35 |
| 2015 | 24 |
| 2016 | 11 |
| 2017 | 5 |
| 2018 | 32 |
| 2019 | 52 |
| 2020 | 86 |
| 2021 | 39 |
| 2022 | 25 |
| 2023 | 22 |
| 2024 | 47 |
| 2025 | 43 |
| 2026 | 9 |
All-Time Record Progression
6 new records| Date | Kind | Detail |
|---|---|---|
| 1997-08-09 | Record high minimum temperature | Record high minimum temperature 19.9 C (67.8 F) |
| 2003-07-31 | Record high minimum temperature | Record high minimum temperature 20.4 C (68.7 F) |
| 2003-08-01 | Record high minimum temperature | Record high minimum temperature 20.9 C (69.6 F) |
| 2008-07-21 | Record daily precipitation | Record daily precipitation 59.9 mm (2.4 in) |
| 2014-07-23 | Record high maximum temperature | Record high maximum temperature 31.4 C (88.5 F) |
| 2018-08-02 | Record high minimum temperature | Record high minimum temperature 21.6 C (70.9 F) |
Wettest Day of Each Month
Jul: 59.9 mm (2.4 in)| Month | Record daily precipitation (mm) | Date |
|---|---|---|
| Jan | 18.9 mm (0.7 in) | 16 January 1999 |
| Feb | 16.9 mm (0.7 in) | 2 February 1985 |
| Mar | 19.9 mm (0.8 in) | 23 March 1986 |
| Apr | 23.5 mm (0.9 in) | 4 April 2000 |
| May | 23.5 mm (0.9 in) | 2 May 1991 |
| Jun | 37.6 mm (1.5 in) | 25 June 1981 |
| Jul | 59.9 mm (2.4 in) | 21 July 2008 |
| Aug | 51.8 mm (2.0 in) | 6 August 1967 |
| Sep | 44.2 mm (1.7 in) | 4 September 1992 |
| Oct | 25.7 mm (1.0 in) | 11 October 1999 |
| Nov | 24.4 mm (1.0 in) | 29 November 1999 |
| Dec | 23.7 mm (0.9 in) | 19 December 1993 |
Period of Record Coverage
1959 to 2026| Year | Days with data | Share of year | Complete |
|---|---|---|---|
| 1959 | 365 | 100% | Yes |
| 1960 | 366 | 100% | Yes |
| 1961 | 365 | 100% | Yes |
| 1962 | 365 | 100% | Yes |
| 1963 | 365 | 100% | Yes |
| 1964 | 366 | 100% | Yes |
| 1965 | 365 | 100% | Yes |
| 1966 | 365 | 100% | Yes |
| 1967 | 365 | 100% | Yes |
| 1968 | 364 | 99% | Yes |
| 1969 | 362 | 99% | 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 | 366 | 100% | Yes |
| 1977 | 365 | 100% | Yes |
| 1978 | 365 | 100% | Yes |
| 1979 | 365 | 100% | Yes |
| 1980 | 366 | 100% | Yes |
| 1981 | 365 | 100% | Yes |
| 1982 | 365 | 100% | Yes |
| 1983 | 365 | 100% | Yes |
| 1984 | 366 | 100% | Yes |
| 1985 | 365 | 100% | Yes |
| 1986 | 365 | 100% | Yes |
| 1987 | 365 | 100% | Yes |
| 1988 | 366 | 100% | Yes |
| 1989 | 365 | 100% | Yes |
| 1990 | 365 | 100% | Yes |
| 1991 | 365 | 100% | Yes |
| 1992 | 366 | 100% | Yes |
| 1993 | 365 | 100% | Yes |
| 1994 | 365 | 100% | Yes |
| 1995 | 365 | 100% | Yes |
| 1996 | 366 | 100% | Yes |
| 1997 | 365 | 100% | Yes |
| 1998 | 365 | 100% | Yes |
| 1999 | 365 | 100% | Yes |
| 2000 | 366 | 100% | Yes |
| 2001 | 365 | 100% | Yes |
| 2002 | 365 | 100% | Yes |
| 2003 | 365 | 100% | Yes |
| 2004 | 366 | 100% | Yes |
| 2005 | 365 | 100% | Yes |
| 2006 | 365 | 100% | Yes |
| 2007 | 365 | 100% | Yes |
| 2008 | 366 | 100% | Yes |
| 2009 | 365 | 100% | Yes |
| 2010 | 336 | 92% | Yes |
| 2011 | 365 | 100% | Yes |
| 2012 | 342 | 93% | Yes |
| 2013 | 347 | 95% | Yes |
| 2014 | 302 | 83% | No |
| 2015 | 365 | 100% | Yes |
| 2016 | 355 | 97% | Yes |
| 2017 | 315 | 86% | No |
| 2018 | 292 | 80% | No |
| 2019 | 323 | 88% | No |
| 2020 | 361 | 99% | Yes |
| 2021 | 365 | 100% | Yes |
| 2022 | 364 | 100% | Yes |
| 2023 | 365 | 100% | Yes |
| 2024 | 366 | 100% | Yes |
| 2025 | 365 | 100% | Yes |
| 2026 | 243 | 67% | No |
Latest Records
20| Date | Station | Record | Value | Beat old record by | Old record stood | Significance |
|---|---|---|---|---|---|---|
| 5 June 2026 | Mustasaari Valassaaret, FI | daily high min | 13.3 C (55.9 F) | 0.1 C (0.2 F) | 4 years | 7 of 100 (Routine) |
| 4 June 2026 | Mustasaari Valassaaret, FI | daily high max | 22.5 C (72.5 F) | 1.4 C (2.5 F) | 4 years | 11 of 100 (Routine) |
| 4 June 2026 | Mustasaari Valassaaret, FI | daily high min | 12.8 C (55.0 F) | 0.2 C (0.4 F) | 4 years | 7 of 100 (Routine) |
| 22 April 2026 | Mustasaari Valassaaret, FI | daily high max | 12.0 C (53.6 F) | 1.4 C (2.5 F) | 15 years | 14 of 100 (Routine) |
| 22 April 2026 | Mustasaari Valassaaret, FI | daily high min | 3.7 C (38.7 F) | 0.2 C (0.4 F) | 7 years | 8 of 100 (Routine) |
| 13 April 2026 | Mustasaari Valassaaret, FI | daily high max | 11.0 C (51.8 F) | 1.9 C (3.4 F) | 0 years | 12 of 100 (Routine) |
| 12 April 2026 | Mustasaari Valassaaret, FI | daily high max | 8.1 C (46.6 F) | 1.0 C (1.8 F) | 11 years | 12 of 100 (Routine) |
| 4 April 2026 | Mustasaari Valassaaret, FI | daily high max | 7.1 C (44.8 F) | 1.8 C (3.2 F) | 9 years | 13 of 100 (Routine) |
| 22 March 2026 | Mustasaari Valassaaret, FI | daily high min (Tie) | 0.6 C (33.1 F) | tie | 67 years | 6 of 100 (Routine) |
| 13 March 2026 | Mustasaari Valassaaret, FI | daily high min (Tie) | 1.8 C (35.2 F) | tie | 12 years | 2 of 100 (Routine) |
| 5 March 2026 | Mustasaari Valassaaret, FI | daily high max (Tie) | 3.1 C (37.6 F) | tie | 0 years | 1 of 100 (Routine) |
| 4 March 2026 | Mustasaari Valassaaret, FI | daily high max | 4.5 C (40.1 F) | 1.1 C (2.0 F) | 0 years | 8 of 100 (Routine) |
| 26 December 2025 | Mustasaari Valassaaret, FI | daily high min | 3.3 C (37.9 F) | 0.7 C (1.3 F) | 14 years | 11 of 100 (Routine) |
| 25 December 2025 | Mustasaari Valassaaret, FI | daily high max | 6.0 C (42.8 F) | 1.0 C (1.8 F) | 10 years | 11 of 100 (Routine) |
| 19 December 2025 | Mustasaari Valassaaret, FI | daily high min | 4.4 C (39.9 F) | 1.6 C (2.9 F) | 16 years | 14 of 100 (Routine) |
| 19 December 2025 | Mustasaari Valassaaret, FI | daily high max | 5.8 C (42.4 F) | 0.3 C (0.5 F) | 4 years | 7 of 100 (Routine) |
| 18 December 2025 | Mustasaari Valassaaret, FI | daily high max | 5.0 C (41.0 F) | 0.1 C (0.2 F) | 64 years | 25 of 100 (Routine) |
| 17 December 2025 | Mustasaari Valassaaret, FI | daily high max (Tie) | 5.0 C (41.0 F) | tie | 28 years | 3 of 100 (Routine) |
| 16 December 2025 | Mustasaari Valassaaret, FI | daily high min | 2.5 C (36.5 F) | 0.1 C (0.2 F) | 14 years | 10 of 100 (Routine) |
| 15 December 2025 | Mustasaari Valassaaret, FI | daily high max (Tie) | 5.1 C (41.2 F) | tie | 52 years | 5 of 100 (Routine) |
Climate Trend
60 complete years, 1959 to 2025| Year | Annual mean temperature | Difference from the station mean |
|---|---|---|
| 1959 | 4.6 C | +0.34 C |
| 1960 | 3.5 C | -0.82 C |
| 1961 | 5.2 C | +0.91 C |
| 1962 | 3.0 C | -1.25 C |
| 1963 | 3.2 C | -1.03 C |
| 1964 | 3.9 C | -0.41 C |
| 1965 | 3.4 C | -0.91 C |
| 1966 | 1.6 C | -2.70 C |
| 1967 | 3.8 C | -0.48 C |
| 1968 | 2.8 C | -1.52 C |
| 1969 | 2.4 C | -1.92 C |
| 1970 | 2.8 C | -1.50 C |
| 1971 | 3.3 C | -1.01 C |
| 1972 | 4.1 C | -0.15 C |
| 1973 | 4.5 C | +0.18 C |
| 1974 | 5.0 C | +0.68 C |
| 1975 | 5.5 C | +1.21 C |
| 1976 | 2.8 C | -1.49 C |
| 1977 | 2.8 C | -1.44 C |
| 1978 | 2.0 C | -2.25 C |
| 1979 | 2.8 C | -1.45 C |
| 1980 | 3.0 C | -1.23 C |
| 1981 | 2.7 C | -1.59 C |
| 1982 | 3.7 C | -0.57 C |
| 1983 | 4.1 C | -0.14 C |
| 1984 | 4.1 C | -0.22 C |
| 1985 | 0.8 C | -3.44 C |
| 1986 | 2.5 C | -1.74 C |
| 1987 | 1.6 C | -2.70 C |
| 1988 | 4.1 C | -0.22 C |
| 1989 | 5.7 C | +1.45 C |
| 1990 | 5.2 C | +0.88 C |
| 1991 | 4.8 C | +0.50 C |
| 1992 | 5.1 C | +0.80 C |
| 1993 | 4.1 C | -0.15 C |
| 1994 | 3.9 C | -0.39 C |
| 1995 | 4.8 C | +0.53 C |
| 1996 | 3.8 C | -0.44 C |
| 1997 | 4.9 C | +0.65 C |
| 1998 | 4.1 C | -0.13 C |
| 1999 | 5.0 C | +0.68 C |
| 2000 | 5.7 C | +1.39 C |
| 2001 | 4.5 C | +0.19 C |
| 2002 | 4.8 C | +0.57 C |
| 2003 | 4.4 C | +0.17 C |
| 2004 | 5.1 C | +0.85 C |
| 2005 | 5.6 C | +1.33 C |
| 2006 | 5.4 C | +1.15 C |
| 2007 | 5.3 C | +1.01 C |
| 2008 | 5.6 C | +1.36 C |
| 2009 | 4.8 C | +0.52 C |
| 2011 | 5.2 C | +0.96 C |
| 2015 | 6.5 C | +2.19 C |
| 2016 | 5.2 C | +0.94 C |
| 2020 | 7.8 C | +3.54 C |
| 2021 | 5.7 C | +1.39 C |
| 2022 | 6.0 C | +1.68 C |
| 2023 | 5.4 C | +1.13 C |
| 2024 | 5.8 C | +1.54 C |
| 2025 | 6.7 C | +2.39 C |
The annual mean temperature here has risen by 0.5 C (0.3 to 0.6) per decade over 1959 to 2025. In Fahrenheit: 0.9 F (0.6 to 1.1) per decade. The slope is a straight line fitted to 60 complete years; the brackets give its 95 percent interval.
| Measure | Per decade (C) | Per decade (F) | Period | Complete years | Reading |
|---|---|---|---|---|---|
| Annual mean temperature | 0.5 C (0.3 to 0.6) per decade | 0.9 F (0.6 to 1.1) per decade | 1959 to 2025 | 60 | Rise |
| Mean daily maximum | 0.5 C (0.3 to 0.6) per decade | 0.8 F (0.6 to 1.0) per decade | 1959 to 2025 | 60 | Rise |
| Mean daily minimum | 0.5 C (0.4 to 0.7) per decade | 0.9 F (0.6 to 1.2) per decade | 1959 to 2025 | 60 | 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) | 31.4 C (88.5 F) | 2014 | 23.3 C (73.9 F) | 68 |
| Coldest night (TNn) | -28.7 C (-19.7 F) | 1966 | -20.2 C (-4.4 F) | 68 |
| Wettest day (Rx1day) | 59.9 mm (2.4 in) | 2008 | 22.9 mm (0.9 in) | 50 |
| Wettest five days (Rx5day) | 81.7 mm (3.2 in) | 1992 | 42.5 mm (1.7 in) | 50 |
| Longest dry spell (CDD) | 73 days | 1964 | 25 days | 50 |
Hottest day (TXx)
| Year | Hottest day (TXx) |
|---|---|
| 1959 | 23.3 C (73.9 F) |
| 1960 | 27.0 C (80.6 F) |
| 1961 | 21.4 C (70.5 F) |
| 1962 | 21.2 C (70.2 F) |
| 1963 | 23.0 C (73.4 F) |
| 1964 | 23.2 C (73.8 F) |
| 1965 | 21.5 C (70.7 F) |
| 1966 | 24.4 C (75.9 F) |
| 1967 | 21.8 C (71.2 F) |
| 1968 | 20.3 C (68.5 F) |
| 1969 | 22.6 C (72.7 F) |
| 1970 | 26.8 C (80.2 F) |
| 1971 | 21.3 C (70.3 F) |
| 1972 | 25.3 C (77.5 F) |
| 1973 | 26.2 C (79.2 F) |
| 1974 | 23.1 C (73.6 F) |
| 1975 | 22.9 C (73.2 F) |
| 1976 | 24.0 C (75.2 F) |
| 1977 | 24.2 C (75.6 F) |
| 1978 | 22.5 C (72.5 F) |
| 1979 | 22.9 C (73.2 F) |
| 1980 | 28.1 C (82.6 F) |
| 1981 | 19.8 C (67.6 F) |
| 1982 | 21.9 C (71.4 F) |
| 1983 | 23.2 C (73.8 F) |
| 1984 | 23.4 C (74.1 F) |
| 1985 | 23.0 C (73.4 F) |
| 1986 | 22.5 C (72.5 F) |
| 1987 | 22.3 C (72.1 F) |
| 1988 | 24.7 C (76.5 F) |
| 1989 | 25.3 C (77.5 F) |
| 1990 | 24.5 C (76.1 F) |
| 1991 | 23.1 C (73.6 F) |
| 1992 | 21.6 C (70.9 F) |
| 1993 | 23.5 C (74.3 F) |
| 1994 | 23.3 C (73.9 F) |
| 1995 | 22.6 C (72.7 F) |
| 1996 | 23.0 C (73.4 F) |
| 1997 | 25.5 C (77.9 F) |
| 1998 | 21.1 C (70.0 F) |
| 1999 | 26.5 C (79.7 F) |
| 2000 | 21.0 C (69.8 F) |
| 2001 | 25.2 C (77.4 F) |
| 2002 | 25.3 C (77.5 F) |
| 2003 | 27.5 C (81.5 F) |
| 2004 | 23.2 C (73.8 F) |
| 2005 | 24.2 C (75.6 F) |
| 2006 | 26.0 C (78.8 F) |
| 2007 | 26.0 C (78.8 F) |
| 2008 | 22.2 C (72.0 F) |
| 2009 | 23.2 C (73.8 F) |
| 2010 | 23.7 C (74.7 F) |
| 2011 | 25.7 C (78.3 F) |
| 2012 | 24.3 C (75.7 F) |
| 2013 | 23.1 C (73.6 F) |
| 2014 | 31.4 C (88.5 F) |
| 2015 | 22.3 C (72.1 F) |
| 2016 | 22.9 C (73.2 F) |
| 2017 | 20.5 C (68.9 F) |
| 2018 | 29.0 C (84.2 F) |
| 2019 | 27.4 C (81.3 F) |
| 2020 | 24.5 C (76.1 F) |
| 2021 | 27.5 C (81.5 F) |
| 2022 | 27.3 C (81.1 F) |
| 2023 | 28.3 C (82.9 F) |
| 2024 | 26.6 C (79.9 F) |
| 2025 | 27.7 C (81.9 F) |
| 2026 | 22.5 C (72.5 F) |
Coldest night (TNn)
| Year | Coldest night (TNn) |
|---|---|
| 1959 | -19.5 C (-3.1 F) |
| 1960 | -19.0 C (-2.2 F) |
| 1961 | -16.1 C (3.0 F) |
| 1962 | -22.5 C (-8.5 F) |
| 1963 | -21.8 C (-7.2 F) |
| 1964 | -21.7 C (-7.1 F) |
| 1965 | -19.2 C (-2.6 F) |
| 1966 | -28.7 C (-19.7 F) |
| 1967 | -24.5 C (-12.1 F) |
| 1968 | -23.0 C (-9.4 F) |
| 1969 | -24.8 C (-12.6 F) |
| 1970 | -22.4 C (-8.3 F) |
| 1971 | -20.1 C (-4.2 F) |
| 1972 | -23.2 C (-9.8 F) |
| 1973 | -23.2 C (-9.8 F) |
| 1974 | -11.4 C (11.5 F) |
| 1975 | -14.0 C (6.8 F) |
| 1976 | -25.3 C (-13.5 F) |
| 1977 | -19.6 C (-3.3 F) |
| 1978 | -25.9 C (-14.6 F) |
| 1979 | -25.7 C (-14.3 F) |
| 1980 | -22.6 C (-8.7 F) |
| 1981 | -22.3 C (-8.1 F) |
| 1982 | -23.0 C (-9.4 F) |
| 1983 | -19.7 C (-3.5 F) |
| 1984 | -22.5 C (-8.5 F) |
| 1985 | -27.2 C (-17.0 F) |
| 1986 | -27.8 C (-18.0 F) |
| 1987 | -27.0 C (-16.6 F) |
| 1988 | -18.2 C (-0.8 F) |
| 1989 | -15.5 C (4.1 F) |
| 1990 | -18.2 C (-0.8 F) |
| 1991 | -16.6 C (2.1 F) |
| 1992 | -11.0 C (12.2 F) |
| 1993 | -17.0 C (1.4 F) |
| 1994 | -20.5 C (-4.9 F) |
| 1995 | -18.0 C (-0.4 F) |
| 1996 | -21.4 C (-6.5 F) |
| 1997 | -16.8 C (1.8 F) |
| 1998 | -18.0 C (-0.4 F) |
| 1999 | -26.9 C (-16.4 F) |
| 2000 | -11.9 C (10.6 F) |
| 2001 | -23.7 C (-10.7 F) |
| 2002 | -16.4 C (2.5 F) |
| 2003 | -27.4 C (-17.3 F) |
| 2004 | -14.6 C (5.7 F) |
| 2005 | -16.4 C (2.5 F) |
| 2006 | -21.1 C (-6.0 F) |
| 2007 | -25.2 C (-13.4 F) |
| 2008 | -8.9 C (16.0 F) |
| 2009 | -19.1 C (-2.4 F) |
| 2010 | -23.4 C (-10.1 F) |
| 2011 | -25.4 C (-13.7 F) |
| 2012 | -24.6 C (-12.3 F) |
| 2013 | -13.3 C (8.1 F) |
| 2014 | -9.1 C (15.6 F) |
| 2015 | -12.6 C (9.3 F) |
| 2016 | -21.7 C (-7.1 F) |
| 2017 | -12.2 C (10.0 F) |
| 2018 | -13.9 C (7.0 F) |
| 2019 | -9.0 C (15.8 F) |
| 2020 | -5.1 C (22.8 F) |
| 2021 | -20.3 C (-4.5 F) |
| 2022 | -16.5 C (2.3 F) |
| 2023 | -12.5 C (9.5 F) |
| 2024 | -26.9 C (-16.4 F) |
| 2025 | -11.0 C (12.2 F) |
| 2026 | -23.2 C (-9.8 F) |
Wettest day (Rx1day)
| Year | Wettest day (Rx1day) |
|---|---|
| 1959 | 18.0 mm (0.7 in) |
| 1960 | 35.0 mm (1.4 in) |
| 1961 | 14.1 mm (0.6 in) |
| 1962 | 9.3 mm (0.37 in) |
| 1963 | 29.0 mm (1.1 in) |
| 1964 | 28.0 mm (1.1 in) |
| 1965 | 24.9 mm (1.0 in) |
| 1966 | 17.7 mm (0.7 in) |
| 1967 | 51.8 mm (2.0 in) |
| 1968 | 24.3 mm (1.0 in) |
| 1969 | 30.4 mm (1.2 in) |
| 1970 | 28.7 mm (1.1 in) |
| 1971 | 14.0 mm (0.6 in) |
| 1972 | 25.3 mm (1.0 in) |
| 1973 | 18.2 mm (0.7 in) |
| 1974 | 19.5 mm (0.8 in) |
| 1975 | 21.9 mm (0.9 in) |
| 1976 | 19.5 mm (0.8 in) |
| 1977 | 23.8 mm (0.9 in) |
| 1978 | 9.2 mm (0.36 in) |
| 1979 | 37.9 mm (1.5 in) |
| 1980 | 19.6 mm (0.8 in) |
| 1981 | 42.1 mm (1.7 in) |
| 1982 | 22.2 mm (0.9 in) |
| 1983 | 17.9 mm (0.7 in) |
| 1984 | 21.3 mm (0.8 in) |
| 1985 | 18.3 mm (0.7 in) |
| 1986 | 19.9 mm (0.8 in) |
| 1987 | 27.0 mm (1.1 in) |
| 1988 | 19.1 mm (0.8 in) |
| 1989 | 22.0 mm (0.9 in) |
| 1990 | 18.9 mm (0.7 in) |
| 1991 | 30.8 mm (1.2 in) |
| 1992 | 44.2 mm (1.7 in) |
| 1993 | 23.7 mm (0.9 in) |
| 1994 | 18.1 mm (0.7 in) |
| 1995 | 30.3 mm (1.2 in) |
| 1996 | 19.5 mm (0.8 in) |
| 1997 | 25.1 mm (1.0 in) |
| 1998 | 21.9 mm (0.9 in) |
| 1999 | 25.7 mm (1.0 in) |
| 2000 | 23.5 mm (0.9 in) |
| 2001 | 33.0 mm (1.3 in) |
| 2002 | 20.7 mm (0.8 in) |
| 2003 | 25.2 mm (1.0 in) |
| 2004 | 20.4 mm (0.8 in) |
| 2005 | 20.7 mm (0.8 in) |
| 2006 | 35.3 mm (1.4 in) |
| 2007 | 24.0 mm (0.9 in) |
| 2008 | 59.9 mm (2.4 in) |
| 2009 | n/a |
| 2010 | n/a |
| 2011 | n/a |
| 2012 | n/a |
| 2013 | n/a |
| 2014 | n/a |
| 2015 | n/a |
| 2016 | n/a |
| 2017 | n/a |
| 2018 | n/a |
| 2019 | n/a |
| 2020 | n/a |
| 2021 | n/a |
| 2022 | n/a |
| 2023 | n/a |
| 2024 | n/a |
| 2025 | n/a |
| 2026 | n/a |
Wettest five days (Rx5day)
| Year | Wettest five days (Rx5day) |
|---|---|
| 1959 | 38.3 mm (1.5 in) |
| 1960 | 60.4 mm (2.4 in) |
| 1961 | 30.1 mm (1.2 in) |
| 1962 | 21.8 mm (0.9 in) |
| 1963 | 49.9 mm (2.0 in) |
| 1964 | 35.1 mm (1.4 in) |
| 1965 | 51.2 mm (2.0 in) |
| 1966 | 29.1 mm (1.1 in) |
| 1967 | 72.7 mm (2.9 in) |
| 1968 | 45.2 mm (1.8 in) |
| 1969 | 37.3 mm (1.5 in) |
| 1970 | 48.9 mm (1.9 in) |
| 1971 | 27.3 mm (1.1 in) |
| 1972 | 58.9 mm (2.3 in) |
| 1973 | 29.5 mm (1.2 in) |
| 1974 | 38.5 mm (1.5 in) |
| 1975 | 42.9 mm (1.7 in) |
| 1976 | 32.7 mm (1.3 in) |
| 1977 | 32.9 mm (1.3 in) |
| 1978 | 17.8 mm (0.7 in) |
| 1979 | 45.3 mm (1.8 in) |
| 1980 | 45.3 mm (1.8 in) |
| 1981 | 64.2 mm (2.5 in) |
| 1982 | 36.5 mm (1.4 in) |
| 1983 | 35.8 mm (1.4 in) |
| 1984 | 35.2 mm (1.4 in) |
| 1985 | 43.5 mm (1.7 in) |
| 1986 | 32.1 mm (1.3 in) |
| 1987 | 60.0 mm (2.4 in) |
| 1988 | 31.6 mm (1.2 in) |
| 1989 | 48.1 mm (1.9 in) |
| 1990 | 29.0 mm (1.1 in) |
| 1991 | 52.8 mm (2.1 in) |
| 1992 | 81.7 mm (3.2 in) |
| 1993 | 51.5 mm (2.0 in) |
| 1994 | 34.8 mm (1.4 in) |
| 1995 | 45.3 mm (1.8 in) |
| 1996 | 42.0 mm (1.7 in) |
| 1997 | 39.8 mm (1.6 in) |
| 1998 | 45.3 mm (1.8 in) |
| 1999 | 61.6 mm (2.4 in) |
| 2000 | 40.1 mm (1.6 in) |
| 2001 | 55.7 mm (2.2 in) |
| 2002 | 35.3 mm (1.4 in) |
| 2003 | 27.7 mm (1.1 in) |
| 2004 | 32.5 mm (1.3 in) |
| 2005 | 46.2 mm (1.8 in) |
| 2006 | 43.1 mm (1.7 in) |
| 2007 | 48.0 mm (1.9 in) |
| 2008 | 67.6 mm (2.7 in) |
| 2009 | n/a |
| 2010 | n/a |
| 2011 | n/a |
| 2012 | n/a |
| 2013 | n/a |
| 2014 | n/a |
| 2015 | n/a |
| 2016 | n/a |
| 2017 | n/a |
| 2018 | n/a |
| 2019 | n/a |
| 2020 | n/a |
| 2021 | n/a |
| 2022 | n/a |
| 2023 | n/a |
| 2024 | n/a |
| 2025 | n/a |
| 2026 | n/a |
Longest dry spell (CDD)
| Year | Longest dry spell (CDD) |
|---|---|
| 1959 | 28 days |
| 1960 | 34 days |
| 1961 | 23 days |
| 1962 | 19 days |
| 1963 | 22 days |
| 1964 | 73 days |
| 1965 | 25 days |
| 1966 | 21 days |
| 1967 | 21 days |
| 1968 | 25 days |
| 1969 | 35 days |
| 1970 | 28 days |
| 1971 | 27 days |
| 1972 | 34 days |
| 1973 | 32 days |
| 1974 | 31 days |
| 1975 | 25 days |
| 1976 | 26 days |
| 1977 | 25 days |
| 1978 | 26 days |
| 1979 | 21 days |
| 1980 | 23 days |
| 1981 | 22 days |
| 1982 | 35 days |
| 1983 | 44 days |
| 1984 | 24 days |
| 1985 | 28 days |
| 1986 | 21 days |
| 1987 | 20 days |
| 1988 | 14 days |
| 1989 | 16 days |
| 1990 | 21 days |
| 1991 | 32 days |
| 1992 | 30 days |
| 1993 | 21 days |
| 1994 | 38 days |
| 1995 | 16 days |
| 1996 | 23 days |
| 1997 | 29 days |
| 1998 | 19 days |
| 1999 | 30 days |
| 2000 | 20 days |
| 2001 | 19 days |
| 2002 | 43 days |
| 2003 | 34 days |
| 2004 | 34 days |
| 2005 | 18 days |
| 2006 | 33 days |
| 2007 | 18 days |
| 2008 | 22 days |
| 2009 | n/a |
| 2010 | n/a |
| 2011 | n/a |
| 2012 | n/a |
| 2013 | n/a |
| 2014 | n/a |
| 2015 | n/a |
| 2016 | n/a |
| 2017 | n/a |
| 2018 | n/a |
| 2019 | n/a |
| 2020 | n/a |
| 2021 | n/a |
| 2022 | n/a |
| 2023 | n/a |
| 2024 | n/a |
| 2025 | n/a |
| 2026 | n/a |
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
60 years with a frostAcross 60 years with a frost, the median last spring frost at Mustasaari Valassaaret falls on 5 May and the median first autumn frost on 27 October, which leaves a median of 175 days between them.
In 1989 to 2025 the median growing season was 190 days. That is 24 days more than in 1959 to 1988.
Fitted over all years, the growing season changes by +5.2 days per decade at this station.
| Measure | Median, all years | Earliest period (1959 to 1988) | Recent period (1989 to 2025) | Recent against earliest | Fitted trend |
|---|---|---|---|---|---|
| Last spring frost | 5 May | 10 May | 26 April | 14 days earlier | -3.3 days per decade |
| First autumn frost | 27 October | 24 October | 1 November | 8 days later | +1.9 days per decade |
| Growing days | 175 days | 166 days | 190 days | 24 days more | +5.2 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
50 years, 1959 to 2008A day with at least 22.8 mm (0.9 in) of rain is expected about once in 2 years. A day with at least 60.5 mm (2.4 in) of rain is expected about once in 100 years.
| Expected about once in | A day with at least | Note |
|---|---|---|
| 2 years | 22.8 mm (0.9 in) | |
| 5 years | 30.7 mm (1.2 in) | |
| 10 years | 36.8 mm (1.4 in) | |
| 25 years | 45.4 mm (1.8 in) | |
| 50 years | 52.6 mm (2.1 in) | |
| 100 years | 60.5 mm (2.4 in) | Longer than the 50 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, 50 years of values from 1959 to 2008.
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: 59.9 mm (2.4 in) in 2008; 51.8 mm (2.0 in) in 1967; 44.2 mm (1.7 in) in 1992.
Station Changes
1 suspectedOne change was suspected in the annual mean temperature of Mustasaari Valassaaret, at 1988. Each is measured against neighbouring stations.
- Relative to 5 neighbouring stations, the station's annual mean temperature from 1988 ran 0.3 C (0.5 F) higher than in the years before (likely change).
| Year | Shift (C) | Shift (F) | Strength | Neighbours |
|---|---|---|---|---|
| 1988 | +0.3 | +0.5 | 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 2026-10-12 (12 October 2026). Records are computed by this site and are not official.
Data as of . Last revised (2026-10-12).