| 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 | 14 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 2 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 2 (Low) | 0 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | — | 1 |
| February | 158 (High) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 3 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 5 (Low) | 0 (Low) | 5 (Low) | 1 (Low) | 574 (Very high) | 0 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 4 (Low) | — | 0 |
| March | 722 (Very high) | 3,720 (Very high) | 10 (Low) | 9 (Low) | 6 (Low) | 86 (High) | 6 (Low) | 2 (Low) | 68 (High) | 0 (Low) | 0 (Low) | 1 (Low) | 16 (Medium) | 1 (Low) | 0 (Low) | 13 (Low) | 27 (Medium) | 9 (Low) | 21 (Medium) | 518 (Very high) | 1 (Low) | 12 (Low) | 1 (Low) | 19 (Medium) | 14 (Low) | 5 | 3 |
| April | 18 (Low) | 892 (Very high) | 13 (Low) | 19 (Low) | 2 (Low) | 4 (Low) | 3 (Low) | 1 (Low) | 264 (Very high) | 0 (Low) | 1 (Low) | 1 (Low) | 1 (Low) | 4 (Low) | 1 (Low) | 0 (Low) | 49 (Medium) | 4 (Low) | 53 (High) | 26 (Medium) | 2 (Low) | 628 (Very high) | 7 (Low) | 17 (Medium) | 4 (Low) | 16 | 4 |
| May | 12 (Low) | 11 (Low) | 69 (Medium) | 20 (Medium) | 150 (Medium) | 2 (Low) | 1 (Low) | 0 (Low) | 103 (Very high) | 0 (Low) | 1 (Low) | 4 (Low) | 1 (Low) | 2 (Low) | 1 (Low) | 0 (Low) | 5 (Low) | 1 (Low) | 24 (Medium) | 0 (Low) | 8 (Low) | 144 (Very high) | 14 (Low) | 3 (Low) | 4 (Low) | 7 | 3 |
| June | 4 (Low) | 3 (Low) | 46 (Medium) | 8 (Low) | 56 (Medium) | 1 (Low) | 3 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 10 (Low) | 5 (Low) | 0 (Low) | 3 (Low) | 3 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 34 (Medium) | 0 (Low) | 2 (Low) | 77 (High) | 10 (Low) | 0 (Low) | 7 (Low) | 10 | 1 |
| July | 2 (Low) | 14 (Low) | 35 (Medium) | 5 (Low) | 7 (Low) | 0 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 18 (Medium) | 3 (Low) | 0 (Low) | 1 (Low) | 6 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 9 (Low) | 0 (Low) | 6 (Low) | 24 (Medium) | 2 (Low) | 0 (Low) | 6 (Low) | 14 | 2 |
| August | 3 (Low) | 2 (Low) | 6 (Low) | 2 (Low) | 3 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 2 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 4 (Low) | 0 (Low) | 4 (Low) | 10 (Low) | 2 (Low) | 0 (Low) | 7 (Low) | 10 | 2 |
| September | 2 (Low) | 2 (Low) | 8 (Low) | 2 (Low) | 3 (Low) | 0 (Low) | 1 (Low) | 1 (Low) | 1 (Low) | 8 (Low) | 4 (Low) | 2 (Low) | 0 (Low) | 1 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 3 (Low) | 0 (Low) | 22 (Medium) | 11 (Low) | 1 (Low) | 0 (Low) | 4 (Low) | 1 | 3 |
| October | 12 (Low) | 3 (Low) | 4 (Low) | 2 (Low) | 1 (Low) | 1 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 4 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 5 (Low) | 0 (Low) | 1 (Low) | 4 (Low) | 0 (Low) | 0 (Low) | 2 (Low) | 1 | 1 |
| November | 7 (Low) | 1 (Low) | 2 (Low) | 1 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 2 (Low) | 0 (Low) | 3 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 20 (Medium) | 0 (Low) | 2 (Low) | 8 (Low) | 1 (Low) | 0 (Low) | 3 (Low) | 0 | 1 |
| December | 7 (Low) | 1 (Low) | 2 (Low) | 0 (Low) | 1 (Low) | 2 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 2 (Low) | 0 (Low) | 2 (Low) | 2 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 1 | 1 |