| 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 | 174 (High) | 1 (Low) | 7 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 19 (Medium) | 23 (Medium) | 1 (Low) | 0 (Low) | 0 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 62 (High) | 0 (Low) | 13 (Low) | 3 (Low) | 0 (Low) | 1 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 13 (Low) | 1 | 2 |
| February | 846 (Very high) | 1 (Low) | 23 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 21 (Medium) | 8 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 2 (Low) | 0 (Low) | 1 (Low) | 110 (Very high) | 0 (Low) | 167 (Very high) | 17 (Medium) | 56 (High) | 1 (Low) | 7 (Low) | 1 (Low) | 9 (Low) | 55 (High) | 5 | 3 |
| March | 221 (Very high) | 4,460 (Very high) | 14 (Low) | 3 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 3 (Low) | 14 (Low) | 0 (Low) | 0 (Low) | 3 (Low) | 4 (Low) | 0 (Low) | 1 (Low) | 6 (Low) | 21 (Medium) | 10 (Low) | 64 (High) | 397 (Very high) | 1 (Low) | 21 (Medium) | 1 (Low) | 8 (Low) | 45 (Medium) | 13 | 3 |
| April | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| May | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — | — |
| June | 5 (Low) | 19 (Low) | 137 (High) | 26 (Medium) | 16 (Low) | 0 (Low) | 2 (Low) | 0 (Low) | 1 (Low) | 1 (Low) | 13 (Low) | 12 (Low) | 0 (Low) | 1 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 23 (Medium) | 0 (Low) | 3 (Low) | 17 (Medium) | 10 (Low) | 0 (Low) | 15 (Medium) | 19 | 6 |
| July | 2 (Low) | 4 (Low) | 50 (Medium) | 7 (Low) | 6 (Low) | 0 (Low) | 16 (Medium) | 1 (Low) | 0 (Low) | 1 (Low) | 9 (Low) | 8 (Low) | 0 (Low) | 0 (Low) | 10 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 10 (Low) | 1 (Low) | 9 (Low) | 8 (Low) | 5 (Low) | 0 (Low) | 6 (Low) | 8 | 6 |
| August | 1 (Low) | 5 (Low) | 9 (Low) | 2 (Low) | 2 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 1 (Low) | 3 (Low) | 0 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 5 (Low) | 0 (Low) | 8 (Low) | 4 (Low) | 1 (Low) | 0 (Low) | 2 (Low) | 10 | 3 |
| September | 77 (Medium) | 2 (Low) | 6 (Low) | 2 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 4 (Low) | 0 (Low) | 3 (Low) | 0 (Low) | 1 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 0 (Low) | 10 (Low) | 0 (Low) | 15 (Medium) | 2 (Low) | 1 (Low) | 0 (Low) | 2 (Low) | 5 | 2 |
| October | 143 (High) | 5 (Low) | 1 (Low) | 1 (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) | 31 (Medium) | 0 (Low) | 2 (Low) | 5 (Low) | 0 (Low) | 0 (Low) | 3 (Low) | 5 | 1 |
| November | 105 (High) | 2 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 2 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 1 (Low) | 1 (Low) | 0 (Low) | 1 (Low) | 27 (Medium) | 0 (Low) | 3 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 11 (Low) | 3 | 2 |
| December | 592 (Very high) | 1 (Low) | 2 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 7 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 0 (Low) | 1 (Low) | 0 (Low) | 7 (Low) | 0 (Low) | 1 (Low) | 9 (Low) | 0 (Low) | 0 (Low) | 4 (Low) | 0 (Low) | 0 (Low) | 19 (Medium) | 1 | 2 |