| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ø |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2007 | 6.1 | 6.1 | 7.5 | 14.9 | 16.3 | 19.0 | 18.8 | 18.6 | 14.0 | 10.3 | 4.7 | 1.8 | 11.5 |
| 2008 | 4.7 | 5.0 | 6.0 | 9.2 | 17.6 | 19.0 | 20.1 | 18.9 | 13.5 | 10.3 | 6.0 | 1.8 | 11.0 |
| 2009 | -1.8 | 2.1 | 5.9 | 13.8 | 16.2 | 18.2 | 19.5 | 20.7 | 16.5 | 10.4 | 8.4 | 2.3 | 11.0 |
| 2010 | -1.5 | 1.8 | 6.2 | 11.7 | 12.5 | 18.8 | 21.6 | 18.3 | 14.0 | 9.4 | 6.4 | -1.4 | 9.8 |
| 2011 | 2.5 | 3.3 | 9.1 | 14.4 | 16.5 | 18.2 | 17.7 | 20.1 | 17.7 | 11.1 | 5.9 | 5.2 | 11.8 |
| 2012 | 3.7 | -1.0 | 9.8 | 10.1 | 16.7 | 17.8 | 19.1 | 20.7 | 15.5 | 10.0 | 6.4 | 3.5 | 11.0 |
| 2013 | 1.7 | 0.5 | 3.0 | 10.2 | 12.3 | 17.8 | 21.7 | 19.3 | 15.3 | 12.0 | 5.7 | 4.3 | 10.3 |
| 2014 | 4.8 | 5.6 | 9.6 | 13.4 | 14.4 | 19.3 | 20.4 | 17.4 | 16.7 | 13.5 | 7.8 | 4.2 | 12.3 |
| 2015 | 3.2 | 1.8 | 7.5 | 11.7 | 15.2 | 18.7 | 22.9 | 22.0 | 14.7 | 10.2 | 8.5 | 14.7 | 12.6 |
| 2016 | 3.6 | 4.8 | 5.6 | 9.5 | 14.9 | 18.1 | 20.8 | 20.2 | 19.1 | 10.3 | 5.6 | 2.4 | 11.2 |
| 2017 | -1.3 | 5.2 | 9.4 | 10.1 | 16.1 | 20.2 | 20.7 | 20.1 | 14.2 | 11.9 | 6.0 | 3.4 | 11.3 |
| 2018 | 5.9 | -0.2 | 4.7 | 14.3 | 17.1 | 19.7 | 22.3 | 21.5 | 16.8 | 12.6 | 6.6 | 4.4 | 12.1 |
| 2019 | 1.5 | 5.8 | 8.5 | 10.9 | 12.7 | 20.8 | 21.3 | 21.0 | 16.0 | 12.3 | 5.8 | 4.5 | 11.8 |
| 2020 | 4.0 | 6.7 | 7.2 | 13.9 | 20.7 | 18.1 | 20.7 | 21.6 | 17.3 | 10.9 | 6.7 | 4.0 | 12.7 |
| 2021 | 2.0 | 4.4 | 6.7 | 8.3 | 11.8 | 20.3 | 19.0 | 17.7 | 17.0 | 10.2 | 4.7 | 4.2 | 10.5 |
| 2022 | 3.0 | 5.8 | 7.9 | 9.9 | 17.0 | 20.2 | 21.9 | 22.9 | 14.9 | 14.1 | 7.9 | 3.3 | 12.4 |
| 2023 | 4.4 | 4.9 | 7.7 | 9.4 | 15.5 | 21.4 | 20.5 | 19.9 | 19.4 | 13.5 | 6.9 | 5.4 | 12.4 |
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec | Ø |
| 2024 | 2.7 | 8.0 | 9.0 | 11.5 | 16.0 | 18.8 | 20.9 | 22.1 | 21.3 | --- | --- | --- | 14.5 |
| Min | -1.8 | -1.0 | 3.0 | 8.3 | 11.8 | 17.8 | 17.7 | 17.4 | 13.5 | 9.4 | 4.7 | -1.4 | 9.8 |
| Max | 6.1 | 6.7 | 9.8 | 14.9 | 20.7 | 21.4 | 22.9 | 22.9 | 19.4 | 14.1 | 8.5 | 14.7 | 12.7 |
| Ø | 2.7 | 3.7 | 7.2 | 11.5 | 15.5 | 19.2 | 20.5 | 20.1 | 16.0 | 11.4 | 6.5 | 4.0 | 11.5 |