Shonai Arpt climate by month
Averages and records for each calendar month at Shonai Arpt, Japan, from 1971 to 2026. The warmest month is August, averaging 29.1°C; the coolest is January at 3.9°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 3.9°C | −1.5°C | 14.8°C22 January 1988 | −12.7°C19 January 1977 | 21 / 21 |
| February | 3.9°C | −2.1°C | 17.5°C22 February 2026 | −12.8°C17 February 1978 | 20 / 21 |
| March | 7.7°C | 0.3°C | 19.1°C27 March 2025 | −9.9°C4 March 1984 | 21 / 21 |
| April | 14.4°C | 5.1°C | 28.6°C21 April 1987 | −3.7°C2 April 1984 | 21 / 21 |
| May | 19.3°C | 10.5°C | 30.4°C31 May 1980 | 2.9°C6 May 1987 | 21 / 21 |
| June | 23.4°C | 15.8°C | 31.9°C21 June 2025 | 7.5°C1 June 1972 | 21 / 21 |
| July | 27.1°C | 19.7°C | 36.1°C31 July 2025 | 9.5°C1 July 1976 | 21 / 21 |
| August | 29.1°C | 21.1°C | 40.1°C3 August 1978 | 13.2°C27 August 1976 | 21 / 21 |
| September | 24.5°C | 16.1°C | 34.4°C1 September 1985 | 7.0°C26 September 1976 | 20 / 21 |
| October | 18.7°C | 9.8°C | 29.4°C17 October 1987 | 1.4°C20 October 1977 | 20 / 20 |
| November | 12.5°C | 4.7°C | 23.9°C1 November 1977 | −2.7°C28 November 1974 | 20 / 20 |
| December | 7.2°C | 1.0°C | 18.6°C11 December 1982 | −12.5°C30 December 1976 | 20 / 20 |
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 20 to 21 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.