| 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 | 906 (Very high) | 1 (Low) | 5 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 9 (Low) | 3 (Low) | 2 (Low) | 0 (Low) | 1 (Low) | 3 (Low) | 1 (Low) | 0 (Low) | 37 (Medium) | 0 (Low) | 2 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 4 (Low) | 0 (Low) | 0 (Low) | 9 (Low) | 1 | 2 |
| February | 431 (Very high) | 1 (Low) | 6 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 29 (Medium) | 0 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 4 (Low) | 1 (Low) | 1 (Low) | 31 (Medium) | 0 (Low) | 958 (Very high) | 1 (Low) | 51 (High) | 1 (Low) | 1 (Low) | 2 (Low) | 3 (Low) | 43 (Medium) | 4 | 2 |
| March | 212 (Very high) | 2,861 (Very high) | 8 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 5 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 3 (Low) | 20 (Medium) | 13 (Low) | 61 (High) | 199 (Very high) | 1 (Low) | 2 (Low) | 2 (Low) | 9 (Low) | 91 (High) | 19 | 4 |
| April | 21 (Low) | 4,165 (Very high) | 19 (Low) | 29 (Medium) | 17 (Low) | 11 (Low) | 0 (Low) | 0 (Low) | 57 (High) | 0 (Low) | 1 (Low) | 3 (Low) | 1 (Low) | 13 (Low) | 0 (Low) | 4 (Low) | 76 (High) | 2 (Low) | 137 (Very high) | 82 (High) | 4 (Low) | 500 (Very high) | 12 (Low) | 17 (Medium) | 74 (High) | 24 | 4 |
| May | 104 (High) | 10 (Low) | 339 (Very high) | 84 (High) | 374 (High) | 3 (Low) | 2 (Low) | 0 (Low) | 13 (Low) | 0 (Low) | 1 (Low) | 15 (Medium) | 0 (Low) | 16 (Medium) | 2 (Low) | 0 (Low) | 5 (Low) | 1 (Low) | 200 (Very high) | 0 (Low) | 9 (Low) | 707 (Very high) | 43 (Medium) | 2 (Low) | 15 (Medium) | 27 | 11 |
| June | 19 (Low) | 3 (Low) | 347 (Very high) | 52 (High) | 550 (Very high) | 1 (Low) | 1 (Low) | 1 (Low) | 3 (Low) | 0 (Low) | 8 (Low) | 32 (Medium) | 6 (Low) | 9 (Low) | 7 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 399 (Very high) | 0 (Low) | 7 (Low) | 509 (Very high) | 22 (Medium) | 0 (Low) | 14 (Low) | 11 | 3 |
| July | 2 (Low) | 0 (Low) | 11 (Low) | 4 (Low) | 8 (Low) | 0 (Low) | 6 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 5 (Low) | 5 (Low) | 0 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 8 (Low) | 0 (Low) | 4 (Low) | 10 (Low) | 2 (Low) | 0 (Low) | 7 (Low) | 12 | 1 |
| August | 1 (Low) | 0 (Low) | 3 (Low) | 2 (Low) | 1 (Low) | 0 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 2 (Low) | 2 (Low) | 2 (Low) | 0 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 3 (Low) | 0 (Low) | 7 (Low) | 6 (Low) | 1 (Low) | 0 (Low) | 2 (Low) | 19 | 1 |
| September | 1 (Low) | 3 (Low) | 3 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 2 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 4 (Low) | 0 (Low) | 7 (Low) | 2 (Low) | 1 (Low) | 0 (Low) | 2 (Low) | 2 | 1 |
| October | 3 (Low) | 3 (Low) | 3 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 2 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 7 (Low) | 0 (Low) | 2 (Low) | 3 (Low) | 0 (Low) | 0 (Low) | 2 (Low) | 0 | 1 |
| November | 7 (Low) | 1 (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) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 12 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 | 0 |
| December | 9 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 2 (Low) | 0 (Low) | 1 (Low) | 3 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 | 0 |