
| 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 | . | . | . | . | . | . | . | . | . | . | . | . | . | 8 | 16 | 14 | 16 | 2 | 2 | . | . | . | . | . | . | |
| Large Skipper | . | . | . | . | . | . | . | . | . | . | . | 2 | 9 | 31 | 12 | 35 | 17 | 12 | 6 | 4 | 1 | . | . | . | . | |
| Grizzled Skipper | . | . | . | . | . | 1 | . | 1 | 1 | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |
| Brimstone | 25 | 21 | 16 | 10 | 10 | 5 | 5 | 1 | 5 | 5 | . | . | . | . | . | 1 | 7 | 9 | 8 | 16 | 3 | 1 | 3 | . | 1 | |
| Large White | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | 4 | . | . | . | . | . | . | . | |
| Small White | . | . | 1 | 1 | . | 1 | 1 | 2 | . | . | . | . | . | . | . | 3 | 5 | 8 | 5 | 3 | 2 | 3 | . | . | . | |
| Green-veined White | . | . | . | . | 1 | 4 | 14 | 1 | 7 | 3 | 2 | . | . | . | . | 3 | 9 | 17 | 24 | 10 | 1 | . | . | . | . | |
| Orange Tip | . | . | 16 | 16 | 14 | 15 | 8 | 6 | 5 | 5 | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |
| Purple Hairstreak | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | 1 | . | . | . | . | . | . | . | |
| Common Blue | . | . | . | . | . | . | . | . | 1 | . | 1 | 2 | 2 | . | . | . | . | 2 | . | 1 | . | . | . | . | . | |
| Holly Blue | . | . | 1 | 1 | 1 | 2 | 2 | 2 | 1 | . | . | . | . | . | . | . | 4 | 6 | 1 | 2 | . | 1 | . | . | . | |
| Duke of Burgundy Fritillary | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |
| White Admiral | . | . | . | . | . | . | . | . | . | . | . | . | . | 2 | 1 | 6 | 2 | 2 | 1 | 1 | . | . | . | . | . | |
| Purple Emperor | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 2 | 1 | . | . | . | . | . | . | . | |
| Red Admiral | . | . | . | . | . | . | . | . | . | . | . | . | . | 2 | 1 | 2 | . | 1 | 1 | 1 | . | 1 | 1 | 1 | . | |
| Small Tortoiseshell | . | . | . | . | . | . | . | . | . | . | . | 1 | 1 | 2 | . | 1 | 1 | 2 | 3 | 4 | 2 | 2 | 1 | 1 | . | |
| Peacock | 4 | 5 | 8 | 5 | 2 | 1 | 1 | 2 | 1 | 2 | . | . | . | . | . | 2 | 10 | 25 | 12 | 5 | 2 | 2 | . | 2 | . | |
| Comma | . | 2 | 3 | . | . | . | . | . | . | . | . | . | . | 1 | 2 | 2 | 1 | 2 | 1 | 1 | . | 2 | 1 | . | . | |
| Pearl-bordered Fritillary | . | . | . | . | 1 | 3 | 6 | 3 | 6 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |
| Dark Green Fritillary | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | 1 | 5 | 1 | 2 | . | 1 | . | . | . | . | . | |
| Silver-washed Fritillary | . | . | . | . | . | . | . | . | . | . | . | . | 2 | 17 | 5 | 13 | 14 | 14 | 9 | 6 | . | . | . | . | . | |
| Speckled Wood | . | . | 1 | 5 | . | 2 | 5 | 2 | 3 | 3 | 5 | 10 | 10 | 4 | 3 | 5 | 2 | 5 | 7 | 15 | 9 | 16 | 20 | 9 | 3 | |
| Wall Brown | . | . | . | . | . | . | . | 2 | 1 | 1 | . | . | . | . | . | . | . | 6 | 3 | 1 | . | . | . | . | . | |
| Gatekeeper/Hedge Brown | . | . | . | . | . | . | . | . | . | . | . | . | . | 2 | 18 | 67 | 126 | 91 | 41 | 41 | 6 | . | . | . | . | |
| Meadow Brown | . | . | . | . | . | . | . | . | . | . | 1 | 3 | 6 | 22 | 26 | 39 | 30 | 27 | 14 | 10 | 1 | 1 | . | . | . | |
| Small Heath | . | . | . | . | . | . | . | . | . | 1 | 2 | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | |
| Ringlet | . | . | . | . | . | . | . | . | . | . | . | 1 | 4 | 23 | 42 | 60 | 51 | 19 | 14 | 2 | . | . | . | . | . | |