
| 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 | . | . | . | . | . | . | . | . | . | . | . | . | 3 | 11 | 15 | 12 | 8 | 9 | 7 | . | . | . | . | |||
| Large Skipper | 27 | . | . | . | . | . | . | . | . | . | . | . | 6 | 5 | 2 | 4 | 1 | 8 | . | 1 | . | . | . | . | |||
| Dingy Skipper | 2 | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Grizzled Skipper | 14 | . | . | . | . | 1 | 2 | 5 | 1 | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | |||
| Brimstone | 100 | 4 | 2 | . | 6 | 5 | 7 | 4 | 1 | . | 1 | 6 | 2 | 1 | 2 | 8 | . | 21 | 20 | 4 | 1 | . | . | . | |||
| Large White | 31 | . | . | . | . | . | 1 | . | . | 1 | . | . | . | . | . | 6 | 4 | 10 | 3 | . | 4 | 1 | 1 | . | |||
| Small White | 14 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 4 | 2 | 2 | 3 | . | 1 | |||
| Green-veined White | 5 | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | 1 | . | . | 4 | . | . | . | . | |||
| Orange Tip | 2 | . | . | 1 | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Green Hairstreak | 2 | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Small Copper | 12 | . | . | . | . | . | . | . | 1 | . | 2 | . | . | . | . | . | 1 | 1 | . | 2 | 2 | . | 2 | 1 | |||
| Brown Argus | 9 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | 3 | 2 | 1 | 2 | . | . | |||
| Common Blue | 74 | . | . | . | . | . | . | . | 8 | 4 | 1 | 3 | 4 | . | . | . | . | 12 | 7 | 17 | 11 | 4 | 2 | 1 | |||
| Chalk-hill Blue | 101 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 6 | 31 | 36 | 17 | 11 | . | . | . | . | |||
| Adonis Blue | 4 | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | 1 | 2 | . | . | . | |||
| Holly Blue | 1 | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Duke of Burgundy Fritillary | 3 | . | . | . | . | . | . | 1 | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Red Admiral | 4 | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | 1 | . | . | . | 1 | . | . | 1 | |||
| Small Tortoiseshell | 10 | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | 2 | 1 | . | 2 | 3 | 1 | . | |||
| Peacock | 26 | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | 8 | 1 | 11 | 5 | . | . | . | . | . | |||
| Comma | 5 | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | 2 | . | 1 | . | . | . | . | 1 | . | |||
| Silver-washed Fritillary | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | 1 | . | . | . | . | . | . | |||
| Speckled Wood | 16 | . | . | 1 | . | 2 | 2 | 1 | . | . | . | 1 | . | . | . | . | . | . | 1 | 2 | 1 | 3 | 2 | . | |||
| Marbled White | 48 | . | . | . | . | . | . | . | . | . | . | . | 2 | 17 | 23 | 1 | 5 | . | . | . | . | . | . | . | |||
| Gatekeeper / Hedge Brown | 53 | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | 6 | 15 | 10 | 11 | 7 | 1 | . | . | . | |||
| Meadow Brown | 482 | . | . | . | . | . | . | . | . | . | 1 | . | 7 | 37 | 44 | 41 | 78 | 74 | 67 | 74 | 34 | 23 | 7 | 6 | |||
| Small Heath | 41 | . | . | . | . | . | . | . | 1 | . | . | 6 | 12 | 11 | 7 | . | . | . | . | . | . | . | . | . | |||
| Ringlet | 42 | . | . | . | . | . | . | . | . | . | . | 1 | 6 | 18 | 17 | . | . | . | . | . | . | . | . | . | |||