| Month | Plantain | Olive | Birch | Privet | Alder | Maple | Mugwort | Composites | Hazel | Heather | Eucalyptus | Ash | Mulberry | Elm | Pine | Poplar | Oak | Sorrel | Willow | Nettle | Other | Unidentified |
| January | 0 | 0 | 0 | 0 | 6 | 0 | 2 | 0 | 0 | 0 | 0 | 61 | 0 | 204 | 1 | 0 | 2 | 1 | 0 | 12 | 1 | 1 |
| February | 0 | 12 | 0 | 0 | 7 | 0 | 4 | 1 | 2 | 0 | 0 | 112 | 0 | 195 | 1 | 42 | 2 | 0 | 2 | 22 | 2 | 2 |
| March | 1 | 0 | 3 | 0 | 1 | 12 | 0 | 1 | 2 | 0 | 0 | 9 | 14 | 4 | 11 | 55 | 11 | 1 | 4 | 22 | 3 | 3 |
| April | 7 | 0 | 1 | 0 | 0 | 14 | 0 | 0 | 0 | 0 | 0 | 0 | 23 | 1 | 15 | 21 | 70 | 1 | 2 | 18 | 7 | 9 |
| May | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| June | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| July | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| August | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| September | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| October | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| November | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| December | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |