| Month | CET | Anomaly | notes |
| January | 4.5 | 0.7 | |
| February | 4.2 | 0.4 | |
| March | 6.5 | 0.9 | |
| April | 9.2 | 1.4 | |
| May | 10.8 | -0.3 | |
| June | 14.0 | -0.1 | |
| July | 16.0 | 0.1 | |
| August | 16.0 | 0.3 | |
| September | 12.7 | -0.9 | |
| October | 10.9 | 0.4 | |
| November | 9.5 | 3.0 | |
| December | 9.7 | 5.2 |
Average for 2015: 10.4, anomaly: 0.93C
Daily CET graph
