Rotterdam/The Hague Arpt climate by month
Averages and records for each calendar month at Rotterdam/The Hague Arpt, Netherlands, from 1956 to 2026. The warmest month is July, averaging 21.9°C; the coolest is January at 5.9°C.
| Month | Avg high | Avg low | Record high | Record low | Years |
|---|---|---|---|---|---|
| January | 5.9°C | 0.8°C | 14.6°C1 January 2023 | −17.1°C7 January 1985 | 69 / 70 |
| February | 6.6°C | 0.7°C | 18.7°C26 February 2019 | −16.5°C4 February 2012 | 69 / 70 |
| March | 9.8°C | 2.3°C | 23.8°C29 March 1968 | −13.4°C4 March 2005 | 69 / 70 |
| April | 13.3°C | 4.2°C | 27.5°C19 April 2018 | −6.0°C1 April 1996 | 69 / 70 |
| May | 17.3°C | 7.8°C | 31.3°C27 May 2017 | −1.4°C6 May 1979 | 69 / 70 |
| June | 20.2°C | 10.8°C | 36.6°C26 June 2026 | 0.5°C2 June 1991 | 69 / 70 |
| July | 21.9°C | 13.0°C | 37.2°C25 July 2019 | 3.6°C19 July 1971 | 69 / 70 |
| August | 21.9°C | 12.9°C | 35.3°C14 August 2026 | 4.6°C3 August 1974 | 70 / 70 |
| September | 19.0°C | 10.5°C | 32.2°C15 September 2020 | 0.4°C16 September 1971 | 68 / 69 |
| October | 14.8°C | 7.7°C | 26.0°C1 October 2011 | −5.1°C29 October 1997 | 70 / 70 |
| November | 9.8°C | 4.1°C | 19.3°C6 November 2018 | −9.0°C16 November 1965 | 70 / 70 |
| December | 6.8°C | 1.8°C | 15.1°C8 December 2000 | −13.3°C2 December 1973 | 70 / 70 |
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 68 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.