
| APR | MAY | JUN | JUL | AUG | SEP | |||||||||||||||||||||
| Week no. | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 |
| Site | ||||||||||||||||||||||||||
| Small Skipper | . | . | . | . | . | . | . | . | 3 | 1 | . | . | . | . | . | . | . | . | ||||||||
| Essex Skipper | . | . | . | . | . | . | . | 5 | 6 | 6 | 4 | 1 | . | . | . | . | . | . | ||||||||
| Swallowtail | . | . | . | . | 5 | 3 | . | 3 | 1 | 1 | . | . | . | . | . | . | . | . | ||||||||
| Clouded Yellow | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | 1 | . | . | ||||||||
| Brimstone | 1 | 8 | 12 | 10 | 12 | 11 | 4 | 3 | 1 | . | . | . | . | 7 | 9 | 5 | 1 | 2 | ||||||||
| Large White | . | . | . | . | . | 3 | 1 | 1 | 1 | 2 | . | 1 | 1 | 3 | 1 | 1 | . | . | ||||||||
| Small White | . | . | . | . | 1 | 1 | 1 | . | . | . | 3 | 6 | 7 | 5 | 2 | 2 | . | . | ||||||||
| Green-veined White | . | . | 10 | 8 | 12 | 6 | 1 | 2 | . | . | 5 | 16 | 11 | 9 | 5 | 5 | . | . | ||||||||
| Orange Tip | . | . | 4 | 1 | 2 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | ||||||||
| Red Admiral | . | . | . | . | 2 | . | . | . | . | . | . | 3 | 1 | 2 | . | 1 | 1 | . | ||||||||
| Small Tortoiseshell | 1 | 1 | . | . | . | . | . | . | . | 1 | . | 1 | . | . | . | . | . | . | ||||||||
| Peacock | 9 | 4 | 2 | 2 | 1 | . | . | 1 | . | . | . | . | 7 | 17 | 11 | 4 | . | . | ||||||||
| Comma | 1 | 1 | . | . | . | . | . | . | . | . | 2 | 1 | . | 1 | . | . | . | . | ||||||||
| Wall Brown | . | . | 1 | . | 3 | 1 | . | . | . | . | . | . | . | . | . | 2 | . | . | ||||||||
| Gatekeeper/Hedge Brown | . | . | . | . | . | . | . | . | . | 2 | 3 | 5 | 3 | 5 | 2 | . | . | . | ||||||||
| Meadow Brown | . | . | . | . | . | . | . | . | . | 3 | 2 | 6 | . | 1 | 2 | . | . | . | ||||||||
| Ringlet | . | . | . | . | . | . | 1 | 8 | 17 | 22 | 21 | 12 | 13 | 1 | . | . | . | . | ||||||||