Temperatuur — 2023
| Month | Herk-de-Stad | Lummen | Difference |
|---|---|---|---|
| Jan | – | – | – |
| Feb | – | – | – |
| Mar | 8.3 °C | 8.1 °C | +0.2 |
| Apr | 8.7 °C | 8.6 °C | +0.1 |
| May | 13.7 °C | 13.7 °C | +0.0 |
| Jun | 20.4 °C | 20.5 °C | -0.1 |
| Jul | 18.7 °C | 18.6 °C | +0.1 |
| Aug |
| 18.1 °C |
| 18 °C |
| +0.1 |
| Sep | 18.4 °C | 18.4 °C | +0.0 |
| Oct | 13.8 °C | 13.7 °C | +0.1 |
| Nov | 7.7 °C | 7.6 °C | +0.1 |
| Dec | 6.7 °C | 6.6 °C | +0.1 |