| Month | CET | Anomaly | notes |
| January | 5.4 | 1.6 | |
| February | 3.1 | -0.7 | |
| March | 5.1 | -0.6 | |
| April | 10.1 | 2.2 | |
| May | 13.3 | 2.2 | |
| June | 16.1 | 2.0 | |
| July | 19.3 | 3.3 | |
| August | 16.8 | 1.0 | |
| September | 13.8 | 0.2 | |
| October | 10.5 | 0.0 | |
| November | 8.3 | 1.9 | |
| December | 6.9 | 2.4 |
Average for 2018: 10.77, anomaly: 1.3C
Daily CET graph
