
| 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 | . | . | . | . | . | . | . | . | . | . | . | . | 12 | 24 | 32 | . | 16 | . | . | . | . | . | . | |||
| Small Skipper | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 23 | . | 8 | . | . | . | . | . | |||
| Silver-spotted Skipper | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 2 | . | . | 1 | . | . | . | |||
| Large Skipper | . | . | . | . | . | . | . | . | . | . | 4 | 2 | 4 | . | . | . | . | . | . | . | . | . | . | |||
| Dingy Skipper | . | . | . | . | 3 | 10 | 10 | 6 | 3 | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | |||
| Grizzled Skipper | . | . | . | 2 | 3 | 14 | 4 | 5 | 3 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Brimstone | 3 | . | . | 3 | 1 | 10 | 10 | 6 | 7 | 1 | 2 | 2 | . | . | 1 | 5 | 4 | 4 | 6 | 2 | . | . | 1 | |||
| Large White | . | . | . | . | . | . | . | . | . | . | . | . | 2 | 2 | 7 | 16 | 15 | 3 | 2 | 5 | 2 | 3 | . | |||
| Small White | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | 6 | 1 | 7 | 2 | 1 | 1 | . | . | |||
| Green-veined White | . | . | 1 | 1 | 1 | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Orange Tip | . | . | . | 1 | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Green Hairstreak | . | . | . | . | . | 5 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Small Copper | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | 1 | 1 | . | 1 | . | 1 | 1 | |||
| Small Blue | . | . | . | . | . | 3 | . | 4 | 18 | 1 | . | 1 | . | . | . | . | 2 | . | . | . | . | . | . | |||
| Brown Argus | . | . | . | . | . | . | 1 | . | . | . | . | 1 | . | . | . | 1 | 6 | 3 | . | . | . | . | . | |||
| Common Blue | . | . | . | . | . | . | 1 | 5 | 29 | 8 | 20 | 7 | 2 | . | 5 | 10 | 48 | 51 | 17 | 39 | 15 | 2 | 1 | |||
| Chalk-hill Blue | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | 5 | 34 | 18 | . | . | . | . | . | |||
| Adonis Blue | . | . | . | . | . | . | 14 | 14 | 21 | 16 | 10 | 3 | . | . | . | . | . | 5 | 10 | 46 | 43 | 5 | 7 | |||
| Holly Blue | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | 2 | . | . | . | 4 | . | . | . | . | |||
| Red Admiral | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | 1 | . | 1 | |||
| Small Tortoiseshell | . | . | . | 1 | . | . | . | . | . | . | 1 | . | . | 1 | 1 | . | 1 | . | 1 | . | . | . | 1 | |||
| Peacock | . | 1 | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | 1 | . | . | . | . | . | |||
| Comma | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | |||
| Dark Green Fritillary | . | . | . | . | . | . | . | . | . | . | 1 | 13 | 35 | 42 | 26 | 8 | 5 | 3 | 1 | . | . | . | . | |||
| Marsh Fritillary | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Speckled Wood | . | . | . | 1 | 1 | . | . | 1 | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Marbled White | . | . | . | . | . | . | . | . | . | . | 1 | 17 | 34 | 30 | 22 | 1 | . | . | . | . | . | . | . | |||
| Gatekeeper/Hedge Brown | . | . | . | . | . | . | . | . | . | . | . | . | . | 3 | 2 | 21 | 9 | 2 | . | . | . | . | . | |||
| Meadow Brown | . | . | . | . | . | . | . | . | . | . | 11 | 25 | 26 | 52 | 131 | 277 | 349 | 259 | 104 | 183 | 98 | 30 | 40 | |||
| Small Heath | . | . | . | . | . | 1 | . | 1 | 24 | 10 | 44 | 53 | 34 | 10 | 25 | 3 | . | 5 | 4 | 13 | 11 | 1 | 1 | |||
| Ringlet | . | . | . | . | . | . | . | . | . | . | . | 5 | 20 | 1 | 6 | 1 | . | . | . | . | . | . | . | |||