
| 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 | ||||||||||||||||||||||||||
| Essex Skipper | . | . | . | . | 2 | 3 | 9 | 6 | . | . | . | . | . | . | . | . | . | . | ||||||||
| Large Skipper | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | ||||||||
| Swallowtail | 1 | 4 | 1 | 7 | 3 | 1 | . | 1 | . | . | . | . | . | . | . | . | . | . | ||||||||
| Brimstone | 4 | 9 | 5 | 10 | 4 | 2 | 1 | 1 | 6 | 2 | 5 | 7 | 16 | 14 | 4 | 1 | . | . | ||||||||
| Large White | . | 2 | 5 | 7 | 1 | . | . | . | . | 12 | 9 | 6 | 28 | 10 | . | 1 | . | . | ||||||||
| Small White | 3 | 8 | 12 | 6 | . | . | . | 2 | 17 | 30 | 30 | 16 | 16 | 7 | . | . | . | . | ||||||||
| Green-veined White | 10 | 10 | 10 | 5 | 2 | . | . | 2 | 25 | 28 | 22 | 36 | 22 | 12 | 24 | 2 | . | . | ||||||||
| Orange Tip | 2 | 3 | 3 | 2 | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | ||||||||
| Red Admiral | . | . | . | . | . | 1 | 1 | . | . | . | . | 2 | 2 | . | . | 1 | . | . | ||||||||
| Small Tortoiseshell | . | . | . | . | . | . | . | 5 | 3 | 2 | . | . | 2 | . | . | 1 | 1 | . | ||||||||
| Peacock | 1 | 1 | . | . | . | . | . | . | . | 2 | 20 | 46 | 38 | 24 | 6 | . | . | . | ||||||||
| Comma | . | . | . | . | . | . | . | . | . | . | . | . | 1 | 1 | . | . | . | . | ||||||||
| Wall Brown | . | . | . | . | . | . | . | . | . | 1 | 1 | . | . | . | . | . | . | . | ||||||||
| Gatekeeper/Hedge Brown | . | . | . | . | . | . | . | . | 1 | 4 | 4 | 7 | 2 | . | . | . | . | . | ||||||||
| Meadow Brown | . | . | . | . | . | . | 1 | . | 1 | . | . | 1 | . | . | . | . | . | . | ||||||||
| Ringlet | . | . | . | . | . | 2 | 7 | 17 | 13 | 6 | . | 1 | . | . | . | . | . | . | ||||||||