| 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 | 462 (Very high) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 6 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 5 (Low) | 0 (Low) | 5 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | — | 3 |
| February | 292 (Very high) | 0 (Low) | 4 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 3 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 4 (Low) | 0 (Low) | 0 (Low) | 6 (Low) | 0 (Low) | 56 (High) | 1 (Low) | 694 (Very high) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 4 (Low) | — | 5 |
| March | 113 (High) | 150 (High) | 6 (Low) | 0 (Low) | 0 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 8 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 11 (Low) | 4 (Low) | 4 (Low) | 32 (Medium) | 167 (Very high) | 0 (Low) | 0 (Low) | 0 (Low) | 5 (Low) | 5 (Low) | 5 | 7 |
| April | 14 (Low) | 33 (Medium) | 7 (Low) | 24 (Medium) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 3 (Low) | 0 (Low) | 3 (Low) | 1 (Low) | 0 (Low) | 6 (Low) | 1 (Low) | 0 (Low) | 11 (Low) | 0 (Low) | 33 (Medium) | 18 (Medium) | 0 (Low) | 832 (Very high) | 6 (Low) | 3 (Low) | 8 (Low) | 5 | 52 |
| May | 19 (Low) | 6 (Low) | 169 (Very high) | 64 (High) | 420 (Very high) | 0 (Low) | 36 (Medium) | 0 (Low) | 4 (Low) | 0 (Low) | 3 (Low) | 5 (Low) | 0 (Low) | 5 (Low) | 2 (Low) | 0 (Low) | 2 (Low) | 0 (Low) | 369 (Very high) | 4 (Low) | 7 (Low) | 453 (Very high) | 25 (Medium) | 4 (Low) | 6 (Low) | 15 | 31 |
| June | 17 (Low) | 0 (Low) | 53 (Medium) | 20 (Medium) | 62 (Medium) | 0 (Low) | 8 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 9 (Low) | 4 (Low) | 0 (Low) | 10 (Low) | 19 (Medium) | 0 (Low) | 0 (Low) | 0 (Low) | 240 (Very high) | 0 (Low) | 4 (Low) | 100 (Very high) | 16 (Medium) | 5 (Low) | 8 (Low) | 6 | 12 |
| July | 4 (Low) | 0 (Low) | 21 (Low) | 6 (Low) | 11 (Low) | 0 (Low) | 14 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 11 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 87 (High) | 0 (Low) | 2 (Low) | 0 (Low) | 8 (Low) | 0 (Low) | 4 (Low) | 5 (Low) | 3 (Low) | 1 (Low) | 2 (Low) | 3 | 5 |
| August | 1 (Low) | 0 (Low) | 10 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 2 (Low) | 0 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 3 (Low) | 1 (Low) | 29 (Medium) | 1 (Low) | 1 (Low) | 0 (Low) | 3 (Low) | 2 | 2 |
| September | 2 (Low) | 0 (Low) | 5 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 3 (Low) | 0 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 32 (Medium) | 0 (Low) | 13 (Low) | 5 (Low) | 0 (Low) | 0 (Low) | 2 (Low) | 1 | 3 |
| October | 17 (Low) | 0 (Low) | 2 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 14 (Low) | 0 (Low) | 3 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 2 (Low) | 0 | 3 |
| November | 12 (Low) | 0 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 5 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 9 (Low) | 0 (Low) | 3 (Low) | 3 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 14 | 5 |
| December | 28 (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) | 2 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 4 | 19 |