
| 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/Essex Skipper | . | . | . | . | . | . | . | . | 2 | 18 | 31 | 73 | 64 | 92 | 67 | 27 | . | 9 | . | . | ||||||
| Essex Skipper | . | . | . | . | . | . | . | . | . | . | . | 2 | 3 | 3 | 2 | . | . | 2 | . | . | ||||||
| Large Skipper | . | . | . | . | . | 1 | 3 | 2 | 7 | 8 | 6 | . | 2 | . | . | . | . | . | . | . | ||||||
| Dingy Skipper | . | . | 10 | 22 | 11 | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | ||||||
| Large White | . | . | . | 2 | 1 | 2 | 1 | . | . | . | 1 | . | 11 | 8 | 5 | 8 | . | 4 | 3 | 2 | ||||||
| Small White | . | . | 1 | 6 | 5 | 5 | 3 | 2 | 3 | . | 1 | 2 | 24 | 8 | 13 | 34 | . | 19 | 4 | 2 | ||||||
| Green-veined White | . | . | . | 1 | . | . | . | . | . | . | . | 1 | 2 | . | . | 2 | . | . | . | . | ||||||
| Small Copper | . | . | 1 | 1 | 6 | 3 | 1 | . | . | . | . | . | . | 4 | 5 | 7 | . | 11 | 1 | 2 | ||||||
| Small Blue | . | . | . | . | . | 1 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | ||||||
| Brown Argus | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | 2 | . | . | . | . | ||||||
| Common Blue | . | . | . | . | 10 | 16 | 22 | 1 | 2 | 1 | 2 | . | . | . | . | 3 | . | 57 | 14 | 37 | ||||||
| Chalk-hill Blue | . | . | . | . | . | . | . | . | . | . | . | 17 | 157 | 395 | 374 | 325 | . | 170 | 32 | 46 | ||||||
| Adonis Blue | . | . | . | . | 2 | 9 | 1 | . | . | . | . | . | . | . | . | . | . | 2 | . | 1 | ||||||
| Red Admiral | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | ||||||
| Small Tortoiseshell | . | 3 | . | . | . | . | . | . | 3 | 6 | 5 | 8 | 3 | 3 | 4 | 1 | . | 2 | 5 | 30 | ||||||
| Peacock | 2 | 2 | . | . | . | . | . | . | . | . | . | . | 4 | 12 | 3 | 3 | . | . | . | . | ||||||
| Dark Green Fritillary | . | . | . | . | . | . | . | . | . | 4 | 1 | 1 | 2 | 2 | . | . | . | . | . | . | ||||||
| Wall Brown | . | . | 1 | . | . | 2 | . | . | . | . | . | . | . | . | 1 | 2 | . | 2 | 2 | . | ||||||
| Marbled White | . | . | . | . | . | . | . | . | 1 | 8 | 11 | 11 | 7 | 9 | 2 | 2 | . | . | . | . | ||||||
| Gatekeeper/Hedge Brown | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | 1 | . | . | . | . | . | ||||||
| Meadow Brown | . | . | . | . | . | 11 | 55 | 84 | 121 | 248 | 266 | 306 | 365 | 546 | 567 | 669 | . | 608 | 151 | 202 | ||||||
| Small Heath | . | . | 28 | 50 | 61 | 37 | 55 | 52 | 41 | 49 | 37 | 19 | 2 | . | 3 | 8 | . | 30 | 10 | 18 | ||||||