| 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 | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| February | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| March | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| April | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| May | 150 (High) | 14 (Low) | 634 (Very high) | 169 (Very high) | 352 (High) | 4 (Low) | 0 (Low) | 0 (Low) | 68 (High) | 1 (Low) | 1 (Low) | 16 (Medium) | 0 (Low) | 8 (Low) | 1 (Low) | 0 (Low) | 3 (Low) | 4 (Low) | 741 (Very high) | 1 (Low) | 8 (Low) | 1,152 (Very high) | 70 (High) | 2 (Low) | 17 (Medium) | 71 | 38 |
| June | 16 (Low) | 7 (Low) | 443 (Very high) | 54 (High) | 562 (Very high) | 1 (Low) | 1 (Low) | 0 (Low) | 6 (Low) | 3 (Low) | 21 (Medium) | 24 (Medium) | 0 (Low) | 3 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 249 (Very high) | 0 (Low) | 8 (Low) | 237 (Very high) | 18 (Medium) | 3 (Low) | 12 (Low) | 31 | 39 |
| July | 2 (Low) | 4 (Low) | 17 (Low) | 5 (Low) | 3 (Low) | 1 (Low) | 3 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 6 (Low) | 5 (Low) | 1 (Low) | 1 (Low) | 2 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 15 (Medium) | 0 (Low) | 10 (Low) | 23 (Medium) | 1 (Low) | 0 (Low) | 5 (Low) | 8 | 9 |
| August | 1 (Low) | 1 (Low) | 6 (Low) | 3 (Low) | 4 (Low) | 0 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 2 (Low) | 1 (Low) | 5 (Low) | 0 (Low) | 1 (Low) | 1 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 8 (Low) | 0 (Low) | 10 (Low) | 11 (Low) | 1 (Low) | 0 (Low) | 4 (Low) | 5 | 12 |
| September | 1 (Low) | 4 (Low) | 9 (Low) | 2 (Low) | 3 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 5 (Low) | 1 (Low) | 8 (Low) | 0 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 4 (Low) | 0 (Low) | 29 (Medium) | 6 (Low) | 2 (Low) | 0 (Low) | 1 (Low) | 4 | 8 |
| October | 5 (Low) | 2 (Low) | 3 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 2 (Low) | 0 (Low) | 2 (Low) | 0 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 8 (Low) | 0 (Low) | 9 (Low) | 7 (Low) | 1 (Low) | 0 (Low) | 2 (Low) | 1 | 5 |
| November | 16 (Low) | 1 (Low) | 2 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 3 (Low) | 0 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 6 (Low) | 0 (Low) | 1 (Low) | 4 (Low) | 0 (Low) | 0 (Low) | 2 (Low) | 0 | 4 |
| December | 30 (Medium) | 0 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 2 (Low) | 0 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 2 (Low) | 1 | 3 |