
| 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 | . | . | . | . | . | . | . | . | . | 12 | 8 | 11 | 2 | . | . | . | . | . | ||||||||
| Essex Skipper | . | . | . | . | . | . | . | . | . | . | 3 | . | . | . | . | . | . | . | ||||||||
| Large Skipper | . | . | . | . | 1 | . | 2 | 12 | 12 | 26 | 1 | . | . | . | . | . | . | . | ||||||||
| Wood White | 1 | . | . | 2 | 8 | 5 | 2 | 1 | 2 | . | . | . | . | . | . | . | . | . | ||||||||
| Brimstone | 4 | 4 | 3 | 3 | . | . | . | . | . | . | . | . | . | . | . | 2 | . | . | ||||||||
| Small White | . | . | . | . | 4 | . | . | . | . | 7 | . | 1 | 1 | 3 | . | . | . | . | ||||||||
| Green-veined White | . | 7 | 11 | 16 | 1 | . | 2 | . | . | . | 12 | 12 | 4 | . | 2 | 1 | . | . | ||||||||
| Orange Tip | . | . | 2 | . | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | ||||||||
| Brown Hairstreak | . | . | . | . | . | . | . | . | 1 | . | . | 1 | . | . | . | . | 5 | . | ||||||||
| Purple Hairstreak | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | ||||||||
| White Admiral | . | . | . | . | . | . | . | 1 | 9 | 6 | 2 | . | . | . | . | . | . | . | ||||||||
| Purple Emperor | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | ||||||||
| Small Tortoiseshell | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | 1 | ||||||||
| Peacock | . | . | 1 | 2 | . | . | . | . | . | . | . | 5 | . | . | . | . | . | . | ||||||||
| Comma | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | ||||||||
| Pearl-bordered Fritillary | . | . | . | 2 | 3 | . | . | . | . | . | . | . | . | . | . | . | . | . | ||||||||
| Speckled Wood | 3 | 11 | 12 | 3 | 2 | 16 | 7 | 10 | 5 | 1 | 6 | 21 | 17 | 9 | 19 | 28 | 20 | 7 | ||||||||
| Wall Brown | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | ||||||||
| Marbled White | . | . | . | . | . | . | . | . | . | 3 | . | . | . | . | . | . | . | . | ||||||||
| Gatekeeper/Hedge Brown | . | . | . | . | . | . | . | 1 | . | 11 | 33 | 36 | 7 | 3 | 5 | 1 | . | . | ||||||||
| Meadow Brown | . | . | . | . | . | 3 | 14 | 61 | 101 | 57 | 17 | 5 | . | 1 | 1 | . | . | . | ||||||||
| Small Heath | . | . | . | 2 | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | ||||||||
| Ringlet | . | . | . | . | . | . | 1 | 1 | 16 | 28 | 5 | 2 | . | 1 | . | . | . | . | ||||||||
| Unknown White | . | . | . | . | . | . | . | . | . | . | . | . | 2 | . | . | . | . | . | ||||||||