
| 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 | . | . | . | . | . | 9 | 34 | 28 | 6 | 1 | . | . | . | . | . | . | . | . | ||||||||
| Large Skipper | . | . | 2 | 3 | 6 | 3 | 2 | . | . | . | . | . | . | . | . | . | . | . | ||||||||
| Dingy Skipper | 9 | 2 | 1 | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | ||||||||
| Grizzled Skipper | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | ||||||||
| Brimstone | . | . | . | . | . | . | 1 | 1 | . | 1 | . | . | . | . | . | . | . | 1 | ||||||||
| Large White | 4 | 2 | 4 | 1 | . | . | 1 | . | 3 | 1 | 2 | . | 1 | . | 1 | 1 | . | . | ||||||||
| Small White | . | 1 | . | . | . | . | 1 | 4 | 3 | 2 | 3 | . | . | 1 | . | . | 6 | . | ||||||||
| Green-veined White | . | 1 | . | . | . | . | . | . | . | . | 1 | 2 | . | . | . | . | . | . | ||||||||
| Orange Tip | 13 | 2 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | ||||||||
| Green Hairstreak | . | . | . | 3 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | ||||||||
| Small Copper | . | 1 | 1 | . | . | . | . | . | 1 | 2 | 1 | 5 | 3 | . | 3 | . | 1 | . | ||||||||
| Small Blue | . | . | . | 4 | 3 | 6 | 4 | . | . | . | . | . | . | . | . | . | . | . | ||||||||
| Brown Argus | 40 | 28 | 30 | 18 | 6 | 6 | . | . | . | 8 | 12 | 9 | 16 | 8 | 3 | 2 | 2 | 1 | ||||||||
| Common Blue | 22 | 48 | 68 | 58 | 18 | 11 | 1 | . | 2 | 3 | 10 | 15 | 32 | 8 | 1 | . | . | . | ||||||||
| Chalk-hill Blue | . | . | . | . | . | . | 17 | 309 | 564 | 327 | 92 | 54 | 26 | 11 | 2 | . | . | . | ||||||||
| Duke of Burgundy Fritillary | 1 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | ||||||||
| Red Admiral | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | ||||||||
| Small Tortoiseshell | . | . | . | . | 5 | 5 | 3 | 1 | 1 | 1 | . | 2 | 1 | . | 1 | . | 1 | . | ||||||||
| Peacock | 4 | . | . | . | 1 | . | . | . | 2 | 4 | 2 | . | 1 | . | . | . | . | 2 | ||||||||
| Dark Green Fritillary | . | . | . | 1 | 9 | 28 | 36 | 6 | . | 3 | . | . | . | . | . | . | . | . | ||||||||
| Speckled Wood | . | . | . | 2 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | 1 | ||||||||
| Wall Brown | 28 | 15 | 5 | 1 | . | . | . | . | 3 | 15 | 24 | 39 | 23 | 19 | 9 | . | . | . | ||||||||
| Marbled White | . | . | . | . | 19 | 120 | 245 | 97 | 6 | . | . | . | . | . | . | . | . | . | ||||||||
| Gatekeeper/Hedge Brown | . | . | . | . | . | . | . | . | . | 1 | 1 | . | . | . | . | . | . | . | ||||||||
| Meadow Brown | . | . | . | 9 | 28 | 46 | 23 | 27 | 38 | 44 | 16 | 9 | 6 | . | . | 1 | . | . | ||||||||
| Small Heath | 57 | 28 | 39 | 57 | 34 | 29 | 20 | 7 | 3 | 8 | 21 | 31 | 70 | 40 | 21 | 2 | 1 | . | ||||||||
| Ringlet | . | . | . | . | . | . | 5 | 2 | 4 | . | . | . | . | . | . | . | . | . | ||||||||