
| 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 | Ind | ||||||||||||||||||||||||||
| Small/Essex Skipper | NI | . | . | . | . | . | . | . | . | 1 | . | . | 22 | 16 | 7 | 2 | 1 | 1 | . | . | . | . | . | . | |||
| Silver-spotted Skipper | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | 1 | 1 | . | . | . | . | . | . | |||
| Large Skipper | 50 | . | . | . | . | . | . | . | . | . | 8 | 28 | 2 | 7 | 3 | . | 1 | . | . | . | . | . | . | . | |||
| Dingy Skipper | 5 | . | . | 1 | . | . | 3 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Grizzled Skipper | 2 | . | . | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Brimstone | 61 | 4 | . | 3 | 6 | 3 | . | 6 | 4 | 5 | 3 | 3 | . | 4 | 9 | 1 | . | . | . | . | . | . | . | . | |||
| Large White | 28 | . | . | . | . | . | . | 2 | 4 | . | . | 1 | 2 | 2 | 6 | 2 | 1 | 1 | 1 | 2 | 1 | . | . | . | |||
| Small White | 17 | . | . | . | . | . | . | 2 | . | . | . | . | . | . | 3 | . | 2 | 1 | 6 | . | 2 | . | . | . | |||
| Green Hairstreak | 6 | . | . | 3 | 1 | 1 | . | 1 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Small Copper | 9 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 3 | 3 | . | 2 | 1 | |||
| Brown Argus | 6 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | 2 | . | 1 | 1 | . | . | . | . | |||
| Common Blue | 44 | . | . | . | 1 | . | 2 | 4 | 3 | 2 | 1 | . | . | . | 2 | 2 | 1 | 4 | 12 | 5 | . | . | . | . | |||
| Chalk-hill Blue | 96 | . | . | . | . | . | . | . | . | . | . | . | . | 5 | 15 | 22 | 26 | 19 | 4 | 4 | 1 | 1 | . | . | |||
| Holly Blue | 2 | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | |||
| Duke of Burgundy Fritillary | 4 | . | . | . | . | 1 | . | 1 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Red Admiral | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 2 | . | . | |||
| Small Tortoiseshell | 15 | 2 | 1 | . | . | . | . | . | . | . | 1 | 1 | . | . | . | 1 | 6 | 3 | . | . | . | . | . | . | |||
| Peacock | 30 | 4 | 4 | 1 | 5 | 1 | . | . | 1 | . | . | . | . | 3 | 5 | . | 2 | . | . | . | . | . | . | . | |||
| Comma | 7 | . | 3 | . | . | . | . | . | . | . | . | 2 | . | . | . | . | . | . | 1 | . | 1 | . | . | . | |||
| Dark Green Fritillary | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | |||
| Silver-washed Fritillary | 22 | . | . | . | . | . | . | . | . | . | . | 5 | 8 | 2 | 5 | . | 1 | 1 | . | . | . | . | . | . | |||
| Speckled Wood | 29 | . | . | . | . | 1 | . | 1 | 5 | 4 | . | . | . | 2 | 2 | 2 | . | 1 | . | 7 | . | 1 | . | . | |||
| Marbled White | 56 | . | . | . | . | . | . | . | . | . | 1 | 14 | 29 | 10 | 2 | . | . | . | . | . | . | . | . | . | |||
| Gatekeeper / Hedge Brown | 172 | . | . | . | . | . | . | . | . | . | . | 4 | 10 | 41 | 40 | 26 | 20 | 23 | 7 | . | . | . | . | . | |||
| Meadow Brown | 341 | . | . | . | . | . | . | . | . | . | 9 | 13 | 41 | 44 | 52 | 44 | 41 | 39 | 33 | 16 | 6 | 2 | 1 | . | |||
| Small Heath | 18 | . | . | . | . | . | . | 1 | . | 3 | . | 1 | . | . | . | . | . | . | 2 | 8 | 3 | . | . | . | |||
| Ringlet | 82 | . | . | . | . | . | . | . | . | . | 7 | 33 | 21 | 10 | 9 | 3 | . | . | . | . | . | . | . | . | |||