| Month | Cypress/Yew | London Plane | Grasses | Plantain | Olive | Birch | Privet | Alder | Maple | Mugwort | Chestnut | Composites | Hazel | Heather | Eucalyptus | Ash | Mulberry | Elm | Pine | Poplar | Goosefoot/Amaranth | Oak | Sorrel | Willow | Nettle | Other | Unidentified |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| January | 142 (High) | 2 (Low) | 8 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 67 (High) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 29 (Medium) | 0 (Low) | 6 (Low) | 1 (Low) | 33 (Medium) | 1 (Low) | 7 (Low) | 0 (Low) | 0 (Low) | 2 (Low) | — | 1 |
| February | 272 (Very high) | 1 (Low) | 6 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 18 (Medium) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 52 (High) | 0 (Low) | 30 (Medium) | 1 (Low) | 201 (Very high) | 0 (Low) | 2 (Low) | 1 (Low) | 5 (Low) | 8 (Low) | 0 | 1 |
| March | 377 (Very high) | 983 (Very high) | 37 (Medium) | 3 (Low) | 6 (Low) | 3 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 10 (Low) | 147 (Very high) | 9 (Low) | 11 (Low) | 192 (Very high) | 0 (Low) | 181 (Very high) | 1 (Low) | 8 (Low) | 40 (Medium) | 2 | 4 |
| April | 13 (Low) | 248 (High) | 30 (Medium) | 10 (Low) | 7 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 2 (Low) | 1 (Low) | 0 (Low) | 30 (Medium) | 10 (Low) | 19 (Medium) | 9 (Low) | 1 (Low) | 895 (Very high) | 13 (Low) | 3 (Low) | 30 (Medium) | 2 | 1 |
| May | 29 (Low) | 9 (Low) | 122 (High) | 20 (Medium) | 520 (Very high) | 2 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 7 (Low) | 4 (Low) | 0 (Low) | 6 (Low) | 2 (Low) | 0 (Low) | 2 (Low) | 1 (Low) | 145 (Very high) | 1 (Low) | 9 (Low) | 323 (Very high) | 13 (Low) | 0 (Low) | 5 (Low) | 1 | 1 |
| June | 2 (Low) | 2 (Low) | 62 (Medium) | 7 (Low) | 72 (Medium) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 32 (Medium) | 2 (Low) | 0 (Low) | 5 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 182 (Very high) | 1 (Low) | 5 (Low) | 154 (Very high) | 8 (Low) | 0 (Low) | 6 (Low) | 0 | 2 |
| July | 1 (Low) | 1 (Low) | 15 (Low) | 2 (Low) | 4 (Low) | 0 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 17 (Medium) | 2 (Low) | 0 (Low) | 1 (Low) | 3 (Low) | 0 (Low) | 1 (Low) | 1 (Low) | 4 (Low) | 1 (Low) | 2 (Low) | 46 (Medium) | 2 (Low) | 0 (Low) | 2 (Low) | 1 | 2 |
| August | 1 (Low) | 1 (Low) | 2 (Low) | 1 (Low) | 2 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 2 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 10 (Low) | 8 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 24 | 3 |
| September | 2 (Low) | 1 (Low) | 6 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 2 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 1 (Low) | 16 (Medium) | 5 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 | 1 |
| October | 2 (Low) | 1 (Low) | 1 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 2 (Low) | 0 (Low) | 1 (Low) | 5 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 1 | 1 |
| November | 1 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 3 (Low) | 0 (Low) | 1 (Low) | 2 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 | 0 |
| December | 39 (Medium) | 0 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 | 0 |