Temperatuur — 2026
| Month | Katwijk | Voorschoten | Difference |
|---|---|---|---|
| Jan | – | – | – |
| Feb | – | – | – |
| Mar | 8.2 °C | 7.9 °C | +0.3 |
| Apr | 9.6 °C | 9.5 °C | +0.1 |
| May | 13.8 °C | 14.5 °C | -0.7 |
| Jun | 18 °C | 18.8 °C | -0.8 |
| Jul | 19.3 °C | 19.8 °C | -0.5 |
| Aug |
| 19.3 °C |
| 19.3 °C |
| +0.0 |
| Sep | 17.7 °C | 17.4 °C | +0.3 |
| Oct | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |