Koln-Bonn Arpt climate by month
Averages and records for each calendar month at Koln-Bonn Arpt, Germany, from 1931 to 2026. The warmest month is July, averaging 24.0°C; the coolest is January at 5.1°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 5.1°C | −0.5°C | 16.2°C5 January 1999 | −25.0°C27 January 1942 | 75 / 79 |
| February | 6.8°C | −0.4°C | 21.0°C27 February 2019 | −20.0°C3 February 1942 | 73 / 79 |
| March | 10.8°C | 1.6°C | 26.8°C31 March 2021 | −13.4°C6 March 1971 | 76 / 79 |
| April | 14.9°C | 4.0°C | 30.8°C21 April 1968 | −8.8°C12 April 1986 | 76 / 82 |
| May | 19.1°C | 7.8°C | 34.4°C29 May 2017 | −2.9°C7 May 1979 | 81 / 82 |
| June | 22.3°C | 11.0°C | 38.0°C27 June 2026 | −0.5°C3 June 1962 | 79 / 82 |
| July | 24.0°C | 12.9°C | 40.3°C25 July 2019 | 2.9°C1 July 1984 | 81 / 82 |
| August | 23.8°C | 12.6°C | 38.8°C12 August 2003 | 1.9°C29 August 1993 | 80 / 82 |
| September | 20.2°C | 9.7°C | 33.6°C15 September 2020 | −2.2°C24 September 1931 | 82 / 82 |
| October | 15.1°C | 6.6°C | 27.6°C4 October 1983 | −6.1°C23 October 1935 | 77 / 82 |
| November | 9.3°C | 3.1°C | 21.2°C2 November 2020 | −10.4°C16 November 1965 | 77 / 80 |
| December | 6.1°C | 0.6°C | 17.9°C31 December 2022 | −18.0°C2 December 1973 | 74 / 80 |
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 73 to 82 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.