Temperatuur — 2020
| Maand | Kaag en Braassem | Alphen aan den Rijn | Verschil |
|---|---|---|---|
| Jan | 6.6 °C | 6.3 °C | +0.3 |
| Feb | 7.2 °C | 7.2 °C | +0.0 |
| Mrt | 6.8 °C | 6.9 °C | -0.1 |
| Apr | 10.4 °C | 11 °C | -0.6 |
| Mei | 12.6 °C | 13.1 °C | -0.5 |
| Jun | 16.8 °C | 17.3 °C | -0.5 |
| Jul | 16.9 °C | 17 °C | -0.1 |
| Aug | – | – | – |
| Sep | – | – | – |
| Okt | – | – | – |
| Nov | – | – | – |
| Dec | – | – | – |