Joensuu Arpt climate by month
Averages and records for each calendar month at Joensuu Arpt, Finland, from 1955 to 2026. The warmest month is July, averaging 21.6°C; the coolest is January at −6.8°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | −6.8°C | −13.7°C | 6.7°C11 January 1971 | −39.0°C13 January 1968 | 68 / 71 |
| February | −6.2°C | −13.5°C | 7.8°C23 February 1990 | −38.5°C1 February 1980 | 68 / 71 |
| March | −0.5°C | −8.9°C | 12.8°C19 March 1990 | −32.1°C3 March 1962 | 68 / 72 |
| April | 5.7°C | −2.8°C | 23.5°C26 April 2001 | −23.9°C5 April 1955 | 69 / 72 |
| May | 13.8°C | 3.1°C | 29.3°C20 May 2026 | −10.5°C1 May 1981 | 70 / 72 |
| June | 19.3°C | 9.2°C | 32.0°C16 June 1998 | −4.2°C3 June 1962 | 68 / 72 |
| July | 21.6°C | 12.1°C | 37.2°C29 July 2010 | 2.2°C1 July 1969 | 68 / 72 |
| August | 19.0°C | 10.4°C | 31.4°C8 August 2010 | −1.7°C29 August 1966 | 68 / 72 |
| September | 12.8°C | 5.7°C | 26.1°C6 September 2024 | −7.2°C24 September 1973 | 68 / 71 |
| October | 5.9°C | 0.7°C | 18.7°C14 October 2018 | −16.8°C31 October 1988 | 67 / 71 |
| November | 0.0°C | −4.6°C | 11.1°C5 November 2025 | −27.3°C29 November 1988 | 67 / 71 |
| December | −4.1°C | −10.2°C | 8.3°C6 December 2006 | −40.0°C10 December 1955 | 67 / 71 |
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 67 to 70 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.