
| 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 | . | . | . | . | . | . | . | . | . | 3 | 103 | 46 | 32 | 16 | 10 | . | . | |||||||||
| Essex Skipper | . | . | . | . | . | . | . | . | 3 | 1 | 12 | 1 | . | . | . | . | . | |||||||||
| Silver-spotted Skipper | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 8 | . | . | |||||||||
| Large Skipper | . | . | . | . | . | . | . | 2 | 6 | 3 | . | 2 | 2 | . | . | . | . | |||||||||
| Dingy Skipper | . | . | . | 4 | 10 | 2 | 1 | . | . | . | . | . | . | . | . | . | . | |||||||||
| Grizzled Skipper | . | . | . | 2 | 7 | 2 | . | . | . | . | . | . | . | . | . | . | . | |||||||||
| Brimstone | . | . | . | 9 | 6 | . | . | . | . | . | . | . | 3 | 7 | 36 | 3 | 6 | |||||||||
| Large White | . | . | . | . | . | 1 | . | 2 | . | . | . | 2 | . | 3 | 3 | . | . | |||||||||
| Small White | . | . | . | . | . | . | . | . | 1 | 1 | . | 4 | 4 | 4 | 14 | 6 | . | |||||||||
| Green-veined White | . | . | . | . | 6 | 1 | 1 | 1 | . | . | . | 5 | 3 | 4 | . | . | . | |||||||||
| Green Hairstreak | . | . | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||||||||
| Small Copper | . | . | . | . | 1 | . | . | . | . | . | . | . | 1 | 1 | 2 | . | . | |||||||||
| Brown Argus | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | 1 | . | |||||||||
| Common Blue | . | . | . | . | . | 6 | 19 | 12 | 7 | . | . | . | . | 1 | 8 | 4 | 7 | |||||||||
| Chalk-hill Blue | . | . | . | . | . | . | . | . | . | . | . | 1 | 2 | 4 | 15 | 1 | . | |||||||||
| Holly Blue | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||||||||
| Red Admiral | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | 1 | |||||||||
| Painted Lady | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | |||||||||
| Small Tortoiseshell | . | 2 | 1 | . | . | 1 | . | . | . | . | 1 | 15 | 9 | 17 | 14 | . | 13 | |||||||||
| Peacock | 10 | . | 1 | 1 | . | . | . | . | . | . | . | . | 1 | 27 | 18 | 3 | . | |||||||||
| Comma | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | 1 | 1 | . | |||||||||
| Dark Green Fritillary | . | . | . | . | . | . | . | . | 2 | 1 | . | . | 1 | . | . | . | . | |||||||||
| Speckled Wood | . | . | . | 4 | 2 | . | . | . | 1 | 2 | 1 | 2 | . | 2 | 2 | . | . | |||||||||
| Wall Brown | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | 1 | . | . | |||||||||
| Marbled White | . | . | . | . | . | . | . | . | 32 | 41 | 162 | 72 | 33 | 1 | . | . | . | |||||||||
| Gatekeeper/Hedge Brown | . | . | . | . | . | . | . | . | . | . | 14 | 32 | 26 | 6 | 11 | . | . | |||||||||
| Meadow Brown | . | . | . | . | . | . | . | 3 | 76 | 59 | 151 | 187 | 146 | 152 | 153 | 123 | 54 | |||||||||
| Small Heath | . | . | . | . | . | 4 | 7 | 6 | 30 | 15 | 33 | 21 | 15 | 1 | . | 1 | 3 | |||||||||
| Ringlet | . | . | . | . | . | . | . | . | 23 | 14 | 30 | 2 | 5 | . | . | . | . | |||||||||