| 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 | 10 (Low) | 0 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 6 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 2 (Low) | 0 (Low) | 2 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 2 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | — | 1 |
| February | 45 (Medium) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 6 (Low) | 0 (Low) | 25 (Medium) | 0 (Low) | 13 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 2 (Low) | 0 | 1 |
| March | 58 (Medium) | 418 (Very high) | 4 (Low) | 1 (Low) | 1 (Low) | 3 (Low) | 0 (Low) | 1 (Low) | 9 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 3 (Low) | 5 (Low) | 23 (Medium) | 6 (Low) | 19 (Medium) | 0 (Low) | 36 (Medium) | 0 (Low) | 2 (Low) | 4 (Low) | 65 | 2 |
| April | 3 (Low) | 24 (Low) | 2 (Low) | 4 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 20 (Medium) | 0 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 2 (Low) | 16 (Medium) | 2 (Low) | 2 (Low) | 5 (Low) | 0 (Low) | 25 (Medium) | 1 (Low) | 1 (Low) | 3 (Low) | 17 | 2 |
| May | 3 (Low) | 4 (Low) | 115 (High) | 9 (Low) | 414 (Very high) | 1 (Low) | 0 (Low) | 1 (Low) | 9 (Low) | 0 (Low) | 1 (Low) | 8 (Low) | 1 (Low) | 7 (Low) | 2 (Low) | 0 (Low) | 1 (Low) | 1 (Low) | 101 (Very high) | 0 (Low) | 6 (Low) | 134 (Very high) | 10 (Low) | 7 (Low) | 10 (Low) | 8 | 2 |
| June | 11 (Low) | 6 (Low) | 70 (Medium) | 12 (Low) | 80 (Medium) | 1 (Low) | 3 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 23 (Medium) | 6 (Low) | 1 (Low) | 16 (Medium) | 3 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 253 (Very high) | 0 (Low) | 5 (Low) | 179 (Very high) | 11 (Low) | 1 (Low) | 20 (Medium) | 9 | 4 |
| July | 2 (Low) | 14 (Low) | 31 (Medium) | 4 (Low) | 9 (Low) | 0 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 17 (Medium) | 4 (Low) | 0 (Low) | 2 (Low) | 15 (Medium) | 1 (Low) | 2 (Low) | 0 (Low) | 7 (Low) | 0 (Low) | 5 (Low) | 19 (Medium) | 1 (Low) | 0 (Low) | 13 (Low) | 88 | 4 |
| August | 1 (Low) | 2 (Low) | 6 (Low) | 2 (Low) | 6 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 2 (Low) | 1 (Low) | 2 (Low) | 0 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 8 (Low) | 8 (Low) | 1 (Low) | 0 (Low) | 5 (Low) | 73 | 3 |
| September | 1 (Low) | 4 (Low) | 5 (Low) | 1 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 2 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 2 (Low) | 0 (Low) | 12 (Low) | 5 (Low) | 1 (Low) | 0 (Low) | 2 (Low) | 1 | 2 |
| October | 6 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 1 | 1 |
| November | 2 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 3 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 | 2 |
| December | 3 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 1 | 1 |