| Month | CET | Anomaly | notes |
| January | 3.5 | -0.3 | |
| February | 3.3 | -0.5 | |
| March | 2.8 | -2.9 | |
| April | 7.5 | -0.3 | |
| May | 10.5 | -0.7 | |
| June | 13.6 | -0.5 | |
| July | 18.5 | 2.5 | |
| August | 17.0 | 1.2 | |
| September | 13.7 | 0.1 | |
| October | 12.4 | 1.9 | |
| November | 6.1 | -0.3 | |
| December | 6.3 | 1.7 |
Average for 2013: 9.64, anomaly: 0.17C
Daily CET graph
