| Month | Cypress/Yew | London Plane | Grasses | Plantain | Olive |
|---|---|---|---|---|---|
| January | — | — | — | — | — |
| February | 466 (Very high) | 0 (Low) | 14 (Low) | 0 (Low) | 0 (Low) |
| March | 381 (Very high) | 22 (Low) | 4 (Low) | 1 (Low) | 0 (Low) |
| April | 6 (Low) | 8 (Low) | 5 (Low) | 13 (Low) | 0 (Low) |
| May | 7 (Low) | 4 (Low) | 33 (Medium) | 21 (Medium) | 10 (Low) |
| June | 5 (Low) | 1 (Low) | 152 (Very high) | 20 (Medium) | 53 (Medium) |
| July | 8 (Low) | 1 (Low) | 37 (Medium) | 8 (Low) | 4 (Low) |
| August | 2 (Low) | 2 (Low) | 3 (Low) | 4 (Low) | 5 (Low) |
| September | 8 (Low) | 1 (Low) | 4 (Low) | 8 (Low) | 2 (Low) |
| October | 1 (Low) | 0 (Low) | 2 (Low) | 2 (Low) | 1 (Low) |
| November | 2 (Low) | 0 (Low) | 1 (Low) | 1 (Low) | 1 (Low) |
| December | 2 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 1 (Low) |