Temperatuur — 2024
| Maand | Alphen aan den Rijn | Kaag en Braassem | Verschil |
|---|---|---|---|
| Jan | 4 °C | – | – |
| Feb | 7.9 °C | – | – |
| Mrt | 8.5 °C | – | – |
| Apr | 10.3 °C | – | – |
| Mei | 15 °C | – | – |
| Jun | 15.2 °C | – | – |
| Jul | 17.5 °C | – | – |
| Aug | 19.2 °C | – | – |
| Sep |
| 15.9 °C |
| – |
| – |
| Okt | 12.2 °C | – | – |
| Nov | 7.3 °C | – | – |
| Dec | 6.4 °C | – | – |