Previous Alcalá de Henares — 2026
| Month | Cypress/Yew | London Plane | Grasses | Plantain | Olive |
|---|---|---|---|---|---|
| January | 499 | 0 | 2 | 0 | 0 |
| February | 3,545 | 0 | 11 | 0 | 0 |
| March | 1,281 | 2,876 | 12 | 1 | 0 |
| April | 44 | 554 | 121 | 18 | 730 |
| May | 27 | 37 | 223 | 38 | 461 |
| June | — | — | — | 33 | 76 |
| July | — | — | — | 2 | 5 |
| August | — | — | — | 2 | 2 |
| September | — | — | — | 0 | 1 |
| October | — | — | — | — | — |
| November | — | — | — | — | — |
| December | — | — | — | — | — |