| Month | CET | Anomaly | notes |
| January | 5.8 | -0.6 | |
| February | 6.0 | -0.6 | |
| March | 5.8 | -3.3 | |
| April | 11.9 | 0.1 | |
| May | 14.8 | -0.8 | |
| June | 18.0 | -0.6 | |
| July | 24.0 | 3.7 | |
| August | 21.3 | 1.2 | |
| September | 17.5 | 0.0 | |
| October | 15.3 | 1.4 | |
| November | 9.2 | -0.1 | |
| December | 9.4 | 2.2 |
Average for 2013: 13.31, anomaly: 0.22C
Daily CET graph
