
| 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 | . | . | . | . | . | . | . | . | . | . | 6 | 3 | 9 | 3 | . | 1 | . | . | . | . | . | |||||
| Essex Skipper | . | . | . | . | . | . | . | . | . | . | . | 2 | 3 | 1 | 2 | . | . | . | . | . | . | |||||
| Silver-spotted Skipper | . | . | . | . | . | . | . | . | . | . | . | . | . | 34 | 43 | 40 | 16 | 1 | . | . | . | |||||
| Large Skipper | . | . | . | . | . | . | . | 1 | 2 | . | . | . | . | . | . | . | . | . | . | . | . | |||||
| Dingy Skipper | . | . | 3 | 13 | 6 | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||||
| Grizzled Skipper | . | 14 | 15 | 14 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||||
| Brimstone | 2 | 3 | 4 | 1 | . | 1 | . | . | . | . | . | . | 1 | 2 | 1 | 1 | . | 1 | 2 | . | . | |||||
| Large White | . | . | . | . | . | . | . | 1 | . | . | 2 | . | 2 | 2 | 1 | 2 | 3 | 1 | . | 1 | 1 | |||||
| Small White | . | . | . | . | . | 2 | . | . | . | . | . | 1 | 5 | 2 | . | 4 | 6 | 2 | 10 | 4 | 1 | |||||
| Green-veined White | . | . | 1 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||||
| Orange Tip | . | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||||
| Green Hairstreak | . | . | . | 1 | 2 | 4 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||||
| Small Copper | . | 1 | 8 | 6 | 3 | 3 | . | . | . | . | 6 | 4 | 4 | . | 1 | 4 | 14 | 18 | 25 | 31 | 9 | |||||
| Small Blue | . | . | . | . | . | . | 2 | 5 | 1 | . | 1 | . | . | . | . | . | . | . | . | . | . | |||||
| Brown Argus | . | . | 1 | 22 | 14 | 22 | 3 | 1 | . | . | . | . | . | 2 | 3 | 3 | 6 | . | 1 | 1 | 1 | |||||
| Common Blue | . | . | . | 5 | 18 | 42 | 37 | 19 | 9 | 9 | 1 | 1 | 1 | 5 | 17 | 11 | 4 | 3 | 3 | 2 | . | |||||
| Chalk-hill Blue | . | . | . | . | . | . | . | . | . | . | . | . | . | 4 | 3 | 6 | . | . | . | . | . | |||||
| Adonis Blue | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 2 | . | . | . | |||||
| Holly Blue | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||||
| Red Admiral | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | |||||
| Small Tortoiseshell | 2 | . | . | . | . | . | . | . | . | 4 | . | . | . | 2 | . | 2 | 4 | 5 | 2 | . | . | |||||
| Peacock | 5 | 5 | 1 | . | 1 | 2 | . | . | . | . | . | 1 | 2 | 5 | 1 | . | . | . | . | . | . | |||||
| Dark Green Fritillary | . | . | . | . | . | . | . | 20 | 77 | 67 | 177 | 84 | 39 | 2 | 1 | . | . | . | . | . | . | |||||
| Speckled Wood | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | 1 | |||||
| Marbled White | . | . | . | . | . | . | . | 9 | 37 | 58 | 98 | 54 | 33 | . | . | . | . | . | . | . | . | |||||
| Gatekeeper/Hedge Brown | . | . | . | . | . | . | . | . | . | . | . | . | 4 | . | 1 | 4 | . | . | . | . | . | |||||
| Meadow Brown | . | . | . | . | . | . | . | . | 1 | 8 | 4 | 29 | 56 | 303 | 558 | 583 | 542 | 255 | 135 | 76 | 19 | |||||
| Small Heath | . | . | . | 2 | 2 | 13 | 13 | 34 | 22 | 37 | 98 | 51 | 46 | 16 | 15 | 32 | 15 | 13 | 18 | 8 | 7 | |||||
| Ringlet | . | . | . | . | . | . | . | . | 1 | 3 | 4 | 1 | . | . | . | . | . | . | . | . | . | |||||