| 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 | 493 (Very high) | 1 (Low) | 8 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 17 (Medium) | 23 (Medium) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 77 (High) | 0 (Low) | 2 (Low) | 3 (Low) | 0 (Low) | 1 (Low) | 4 (Low) | 1 (Low) | 0 (Low) | 5 (Low) | 0 | 4 |
| February | 696 (Very high) | 0 (Low) | 9 (Low) | 4 (Low) | 2 (Low) | 1 (Low) | 0 (Low) | 8 (Low) | 1 (Low) | 4 (Low) | 0 (Low) | 1 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 37 (Medium) | 0 (Low) | 265 (Very high) | 3 (Low) | 17 (Medium) | 2 (Low) | 4 (Low) | 1 (Low) | 1 (Low) | 11 (Low) | 2 | 6 |
| March | 463 (Very high) | 1,934 (Very high) | 14 (Low) | 6 (Low) | 2 (Low) | 2 (Low) | 0 (Low) | 4 (Low) | 69 (High) | 0 (Low) | 0 (Low) | 2 (Low) | 0 (Low) | 5 (Low) | 1 (Low) | 23 (Medium) | 112 (Very high) | 81 (High) | 25 (Medium) | 48 (Medium) | 1 (Low) | 46 (Medium) | 3 (Low) | 5 (Low) | 13 (Low) | 4 | 7 |
| April | 41 (Medium) | 417 (Very high) | 10 (Low) | 42 (Medium) | 11 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 141 (Very high) | 0 (Low) | 0 (Low) | 2 (Low) | 6 (Low) | 7 (Low) | 0 (Low) | 2 (Low) | 75 (High) | 7 (Low) | 34 (Medium) | 2 (Low) | 4 (Low) | 208 (Very high) | 5 (Low) | 5 (Low) | 28 (Medium) | 7 | 13 |
| May | 39 (Medium) | 11 (Low) | 93 (High) | 97 (High) | 104 (Medium) | 3 (Low) | 0 (Low) | 0 (Low) | 50 (High) | 0 (Low) | 0 (Low) | 5 (Low) | 0 (Low) | 22 (Medium) | 0 (Low) | 0 (Low) | 21 (Medium) | 1 (Low) | 100 (Very high) | 0 (Low) | 5 (Low) | 622 (Very high) | 24 (Medium) | 5 (Low) | 9 (Low) | 10 | 8 |
| June | 17 (Low) | 2 (Low) | 67 (Medium) | 21 (Medium) | 155 (Medium) | 1 (Low) | 0 (Low) | 0 (Low) | 5 (Low) | 0 (Low) | 10 (Low) | 10 (Low) | 1 (Low) | 10 (Low) | 3 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 286 (Very high) | 0 (Low) | 5 (Low) | 299 (Very high) | 14 (Low) | 2 (Low) | 45 (Medium) | 12 | 11 |
| July | 5 (Low) | 1 (Low) | 10 (Low) | 10 (Low) | 11 (Low) | 1 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 2 (Low) | 7 (Low) | 6 (Low) | 0 (Low) | 2 (Low) | 30 (Medium) | 1 (Low) | 0 (Low) | 0 (Low) | 7 (Low) | 0 (Low) | 9 (Low) | 32 (Medium) | 1 (Low) | 0 (Low) | 4 (Low) | 13 | 5 |
| August | 5 (Low) | 2 (Low) | 8 (Low) | 3 (Low) | 3 (Low) | 1 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 2 (Low) | 4 (Low) | 0 (Low) | 1 (Low) | 5 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 5 (Low) | 0 (Low) | 11 (Low) | 14 (Low) | 1 (Low) | 0 (Low) | 4 (Low) | 32 | 4 |
| September | 2 (Low) | 5 (Low) | 8 (Low) | 3 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 4 (Low) | 1 (Low) | 3 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 4 (Low) | 0 (Low) | 10 (Low) | 9 (Low) | 0 (Low) | 0 (Low) | 3 (Low) | 4 | 2 |
| October | 14 (Low) | 15 (Low) | 3 (Low) | 2 (Low) | 2 (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) | 0 (Low) | 1 (Low) | 0 (Low) | 3 (Low) | 3 (Low) | 0 (Low) | 1 (Low) | 5 (Low) | 3 | 2 |
| November | 3 (Low) | 1 (Low) | 2 (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) | 0 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 3 (Low) | 0 (Low) | 0 (Low) | 5 (Low) | 0 | 2 |
| December | 17 (Low) | 1 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 14 (Low) | 0 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 4 (Low) | 0 (Low) | 0 (Low) | 8 (Low) | 1 | 1 |