
| 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 | . | . | . | . | . | . | 30 | 69 | 28 | 3 | 8 | . | . | . | . | . | . | |||||||||
| Essex Skipper | . | . | . | . | . | . | 4 | 9 | 11 | 3 | . | . | . | . | . | . | . | |||||||||
| Silver-spotted Skipper | . | . | . | . | . | . | . | . | . | 5 | 10 | 2 | 1 | . | 1 | . | . | |||||||||
| Large Skipper | . | . | . | . | . | 5 | 24 | . | . | . | . | . | . | . | . | . | . | |||||||||
| Dingy Skipper | . | . | 1 | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | |||||||||
| Grizzled Skipper | . | 4 | 7 | 3 | . | 3 | . | . | . | . | . | . | . | . | . | . | . | |||||||||
| Clouded Yellow | . | . | . | . | . | . | . | . | . | . | . | . | . | 2 | . | . | . | |||||||||
| Brimstone | 5 | 7 | 15 | . | . | 1 | 2 | . | 5 | . | 8 | 3 | 2 | 4 | . | . | . | |||||||||
| Large White | . | . | 6 | . | 3 | 2 | . | . | . | 1 | 4 | 2 | . | . | . | . | . | |||||||||
| Small White | . | . | . | . | . | . | . | 2 | 5 | . | 2 | 4 | 4 | 1 | 1 | . | . | |||||||||
| Green-veined White | 1 | 4 | 2 | 2 | . | 1 | . | . | 4 | 4 | 13 | 10 | . | . | 1 | . | . | |||||||||
| Orange Tip | . | 4 | 1 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | |||||||||
| Green Hairstreak | 2 | 1 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||||||||
| Purple Hairstreak | . | . | . | . | . | . | . | . | . | . | 4 | . | . | 1 | . | . | . | |||||||||
| Small Copper | . | . | 2 | 1 | . | . | . | . | . | . | 4 | 1 | . | . | 1 | 1 | 2 | |||||||||
| Brown Argus | . | . | 1 | 1 | . | 1 | 2 | . | . | . | 10 | 2 | 6 | 3 | . | . | . | |||||||||
| Common Blue | . | . | . | 4 | 1 | 4 | 3 | 1 | 2 | 6 | 19 | 14 | 17 | 17 | 4 | . | . | |||||||||
| Chalk-hill Blue | . | . | . | . | . | . | . | 1 | 9 | 5 | 11 | 1 | 2 | 1 | . | . | . | |||||||||
| Holly Blue | . | . | . | . | . | . | . | . | . | . | . | 2 | . | . | . | . | . | |||||||||
| Painted Lady | 1 | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | 1 | |||||||||
| Small Tortoiseshell | . | . | . | . | . | . | . | 2 | 1 | . | . | . | . | 2 | . | . | 2 | |||||||||
| Peacock | 1 | . | . | . | . | . | . | . | 1 | . | 2 | . | . | . | . | . | . | |||||||||
| Comma | . | . | . | . | . | . | 1 | . | . | 1 | . | . | . | . | 1 | 1 | . | |||||||||
| Speckled Wood | 3 | 9 | 6 | 2 | 2 | 6 | 14 | 4 | 6 | 8 | 7 | 5 | 22 | 36 | 21 | 6 | 3 | |||||||||
| Wall Brown | . | . | 2 | 4 | . | . | . | . | . | . | 11 | 5 | 12 | 15 | . | . | . | |||||||||
| Marbled White | . | . | . | . | . | . | 31 | 36 | 21 | . | . | . | . | . | . | . | . | |||||||||
| Gatekeeper/Hedge Brown | . | . | . | . | . | . | 7 | 38 | 51 | 33 | 17 | 7 | 3 | 1 | . | . | . | |||||||||
| Meadow Brown | . | . | . | . | . | 12 | 74 | 95 | 81 | 51 | 49 | 11 | 22 | 24 | 9 | 2 | . | |||||||||
| Small Heath | . | . | 2 | 9 | 7 | 10 | 31 | 28 | 16 | 6 | 7 | 2 | 24 | 30 | 9 | 6 | 3 | |||||||||
| Ringlet | . | . | . | . | . | . | 11 | 24 | 2 | . | . | . | . | . | . | . | . | |||||||||