Suttsu climate by month
Averages and records for each calendar month at Suttsu, Japan, from 1951 to 2026. The warmest month is August, averaging 24.4°C; the coolest is January at −0.4°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −0.4°C | −5.3°C | 8.0°C20 January 2010 | −14.9°C14 January 1967 | 47 / 75 |
| February | −0.2°C | −5.1°C | 11.2°C23 February 1967 | −14.1°C17 February 1978 | 45 / 75 |
| March | 3.3°C | −2.0°C | 17.5°C28 March 2018 | −11.0°C4 March 1951 | 59 / 75 |
| April | 9.8°C | 2.7°C | 27.7°C21 April 1998 | −4.9°C1 April 1976 | 62 / 75 |
| May | 15.3°C | 7.1°C | 29.0°C27 May 2019 | −0.9°C3 May 1955 | 66 / 75 |
| June | 18.4°C | 11.5°C | 29.2°C28 June 2010 | 3.9°C1 June 1981 | 64 / 75 |
| July | 22.4°C | 16.3°C | 32.4°C31 July 2000 | 8.1°C6 July 1979 | 65 / 75 |
| August | 24.4°C | 18.4°C | 33.5°C6 August 2010 | 10.8°C22 August 1956 | 66 / 75 |
| September | 21.2°C | 14.2°C | 32.2°C5 September 1998 | 4.8°C28 September 1964 | 67 / 75 |
| October | 15.4°C | 7.9°C | 25.6°C3 October 2025 | −0.5°C31 October 1955 | 63 / 74 |
| November | 8.1°C | 2.0°C | 20.6°C3 November 2003 | −8.7°C29 November 1971 | 43 / 74 |
| December | 2.3°C | −3.0°C | 15.1°C1 December 1953 | −13.0°C24 December 1984 | 44 / 74 |
Years shows the number behind the average high, then the number holding a record for that month. They differ because a year contributes an average only when the month has at least 25 days of readings, while a single reading is enough to set a record. The average low is withheld on the same 25-day rule and is counted separately again; it is shown as a dash where the archive cannot support it. Across the twelve months here the averages rest on 43 to 67 years each.
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Every figure on this page is computed from NOAA GHCN-Daily observations stored per station, per year, per month. Nothing is modelled, interpolated or estimated, and a month the archive never covered is left out rather than filled in. A station appears here only once all twelve months carry an average from at least 10 years. See how this is built.