| Month | CET | Anomaly | notes |
| January | 3.2 | -0.6 | |
| February | 5.3 | 1.5 | |
| March | 7.3 | 1.6 | |
| April | 6.5 | -1.3 | |
| May | 10.3 | -0.9 | |
| June | 15.5 | 1.4 | |
| July | 17.8 | 1.9 | |
| August | 16.0 | 0.2 | |
| September | 16.0 | 2.4 | |
| October | 12.0 | 1.4 | |
| November | 7.2 | 0.8 | |
| December | 6.3 | 1.8 |
Average for 2021: 10.32, anomaly: 0.85C
Daily CET graph
