| Month | CET | Anomaly | notes |
| January | 4.1 | 0.3 | |
| February | 6.3 | 2.5 | |
| March | 8.8 | 3.1 | |
| April | 9.1 | 1.2 | |
| May | 13.3 | 2.1 | |
| June | 16.1 | 2.0 | |
| July | 16.9 | 0.9 | |
| August | 15.8 | 0.0 | |
| September | 13.6 | 0.0 | |
| October | 12.3 | 1.8 | |
| November | 6.8 | 0.4 | |
| December | 4.8 | 0.2 |
Average for 2017: 10.67, anomaly: 1.21C
Daily CET graph
