Temperatuur — 2026
| Maand | Alphen aan den Rijn | Leiderdorp | Verschil |
|---|---|---|---|
| Jan | 2.8 °C | – | – |
| Feb | 5.8 °C | – | – |
| Mrt | 8.1 °C | 7.7 °C | +0.4 |
| Apr | 9.6 °C | 9.2 °C | +0.4 |
| Mei | 14.6 °C | 13.8 °C | +0.8 |
| Jun | 19 °C | 18 °C | +1.0 |
| Jul | 19.6 °C | 19 °C | +0.6 |
| Aug |
| – |
| – |
| – |
| Sep | – | – | – |
| Okt | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |