| Month | CET | Anomaly | notes |
| January | 3.0 | -0.8 | |
| February | 4.1 | 0.4 | |
| March | 7.0 | 1.3 | |
| April | 10.0 | 2.1 | |
| May | 12.1 | 0.9 | |
| June | 14.8 | 0.6 | |
| July | 16.1 | 0.1 | |
| August | 16.6 | 0.8 | |
| September | 14.2 | 0.6 | |
| October | 11.6 | 0.9 | |
| November | 8.7 | 2.1 | |
| December | 3.1 | -1.5 |
Average for 2009: 10.14C, anomaly: 0.63C
Daily CET graph
