| 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 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 6 (Low) | 0 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 61 (High) | 0 (Low) | 204 (Very high) | 1 (Low) | 0 (Low) | 2 (Low) | 1 (Low) | 0 (Low) | 12 (Low) | 1 | 1 |
| February | 0 (Low) | 12 (Low) | 0 (Low) | 0 (Low) | 7 (Low) | 0 (Low) | 4 (Low) | 1 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 112 (Very high) | 0 (Low) | 195 (Very high) | 1 (Low) | 42 (Medium) | 2 (Low) | 0 (Low) | 2 (Low) | 22 (Medium) | 2 | 2 |
| March | 1 (Low) | 0 (Low) | 3 (Low) | 0 (Low) | 1 (Low) | 12 (Low) | 0 (Low) | 1 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 9 (Low) | 14 (Low) | 4 (Low) | 11 (Low) | 55 (High) | 11 (Low) | 1 (Low) | 4 (Low) | 22 (Medium) | 3 | 3 |
| April | 7 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 14 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 23 (Medium) | 1 (Low) | 15 (Medium) | 21 (Medium) | 70 (High) | 1 (Low) | 2 (Low) | 18 (Medium) | 7 | 9 |
| May | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| June | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| July | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| August | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| September | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| October | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| November | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| December | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |