
| 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 | . | . | . | . | . | . | . | . | . | . | . | . | 10 | 5 | 11 | 8 | . | . | 1 | . | . | . | . | |||
| Essex Skipper | . | . | . | . | . | . | . | . | . | . | . | . | 2 | 2 | 2 | 1 | . | . | . | . | . | . | . | |||
| Silver-spotted Skipper | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | 6 | 31 | 41 | 18 | 7 | 2 | . | . | |||
| Large Skipper | . | . | . | . | . | . | . | . | . | . | . | 2 | . | . | . | . | . | . | . | . | . | . | . | |||
| Dingy Skipper | . | . | . | 1 | 9 | 5 | 3 | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Grizzled Skipper | . | . | . | 11 | 5 | 2 | . | 1 | 2 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Clouded Yellow | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | 1 | 1 | . | |||
| Brimstone | . | 1 | 1 | 2 | . | 1 | 2 | . | . | . | . | . | . | . | 3 | 5 | . | . | . | . | . | . | . | |||
| Large White | . | . | . | . | . | . | . | . | 2 | . | . | . | 3 | 1 | 5 | 6 | 3 | . | . | . | . | . | . | |||
| Small White | . | . | . | 1 | . | . | . | . | . | . | . | 2 | . | . | 4 | 3 | 3 | 1 | 1 | 1 | . | . | . | |||
| Green-veined White | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | |||
| Green Hairstreak | . | . | . | . | 3 | 2 | . | . | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Small Copper | . | . | . | 4 | 16 | 17 | 3 | 1 | . | . | . | . | 5 | 8 | 10 | 13 | 2 | 1 | . | 2 | 3 | 5 | 4 | |||
| Small Blue | . | . | . | . | . | 1 | . | . | 3 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Brown Argus | . | . | . | 1 | 13 | 7 | 4 | 2 | 6 | 1 | . | . | . | . | . | 7 | 3 | 2 | 5 | 3 | 2 | . | . | |||
| Common Blue | . | . | . | . | 6 | 26 | 29 | 26 | 16 | 2 | 4 | 2 | 1 | . | 6 | 5 | 12 | 13 | 13 | 10 | 6 | 6 | 6 | |||
| Chalk-hill Blue | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 2 | 3 | 5 | 1 | . | . | . | . | . | |||
| Adonis Blue | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | 2 | . | 1 | . | . | |||
| Holly Blue | . | . | . | 3 | 3 | . | 1 | . | . | . | . | . | . | 1 | 5 | 1 | 1 | . | . | . | . | . | . | |||
| Red Admiral | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | 1 | . | |||
| Small Tortoiseshell | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | 1 | . | 1 | . | 1 | . | |||
| Peacock | . | 1 | 1 | 1 | . | . | . | . | 1 | . | . | 1 | . | . | 3 | . | . | 1 | . | . | . | . | . | |||
| Dark Green Fritillary | . | . | . | . | . | . | . | . | . | 11 | 39 | 71 | 50 | 20 | 18 | 16 | 3 | . | . | . | . | . | . | |||
| Marbled White | . | . | . | . | . | . | . | . | . | 15 | 85 | 115 | 54 | 25 | 4 | 1 | . | . | . | . | . | . | . | |||
| Gatekeeper/Hedge Brown | . | . | . | . | . | . | . | . | . | . | . | . | 1 | 2 | 2 | 1 | 2 | . | . | . | . | . | . | |||
| Meadow Brown | . | . | . | . | . | . | . | . | . | . | 4 | 18 | 42 | 63 | 293 | 369 | 928 | 542 | 485 | 280 | 106 | 55 | 22 | |||
| Small Heath | . | . | . | . | 1 | 3 | 7 | 11 | 22 | 45 | 47 | 86 | 45 | 51 | 27 | 11 | 9 | 2 | 6 | 3 | 1 | 1 | 1 | |||
| Ringlet | . | . | . | . | . | . | . | . | . | . | 4 | 2 | 3 | . | . | . | . | . | . | . | . | . | . | |||