| Month | CET | Anomaly | notes |
| January | 2.5 | 1.3 | |
| February | 0.3 | -0.7 | |
| March | 1.8 | -0.4 | |
| April | 6.5 | 2.6 | |
| May | 7.9 | 1.1 | |
| June | 10.8 | 1.1 | |
| July | 13.0 | 1.4 | |
| August | 12.3 | 0.9 | |
| September | 9.5 | -0.1 | |
| October | 6.6 | -0.5 | |
| November | 5.5 | 1.9 | |
| December | 4.3 | 2.4 |
Average for 2018: 6.78, anomaly: 0.94C
Daily CET graph
