
| 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 | . | . | . | . | . | . | . | . | . | 21 | 23 | 9 | 8 | . | . | . | . | . | ||||||||
| Essex Skipper | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | ||||||||
| Large Skipper | . | . | . | . | . | 1 | 1 | 9 | 35 | 40 | 38 | 9 | 3 | . | . | . | . | . | ||||||||
| Dingy Skipper | . | . | . | 16 | 66 | 59 | 17 | 12 | 1 | . | . | . | . | . | . | . | . | . | ||||||||
| Brimstone | . | . | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | ||||||||
| Large White | . | . | 1 | . | 8 | 4 | . | 1 | . | 1 | 5 | 10 | 6 | 5 | 7 | 6 | 6 | 3 | ||||||||
| Small White | . | . | . | . | 2 | 1 | . | . | 2 | . | 4 | 11 | 16 | 12 | 16 | 13 | 4 | 3 | ||||||||
| Green-veined White | . | . | 1 | 5 | . | 1 | . | . | . | . | . | 1 | . | . | 3 | 2 | . | . | ||||||||
| Orange Tip | . | . | 5 | 1 | 2 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | ||||||||
| Green Hairstreak | . | . | 2 | 4 | 3 | 2 | 1 | . | . | . | . | . | . | . | . | . | . | . | ||||||||
| Small Copper | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | 1 | . | . | . | ||||||||
| Small Blue | . | . | . | . | . | . | . | 2 | 3 | . | . | . | . | . | . | . | . | . | ||||||||
| Brown Argus | . | . | . | . | 7 | 12 | 13 | 11 | 3 | . | . | . | 7 | 15 | 15 | 22 | 12 | 4 | ||||||||
| Common Blue | . | . | . | . | 12 | 36 | 43 | 35 | 32 | 2 | 1 | 27 | 70 | 97 | 123 | 86 | 34 | 41 | ||||||||
| Chalk-hill Blue | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | ||||||||
| Adonis Blue | . | . | . | . | 20 | 55 | 24 | 25 | 4 | . | . | . | . | 4 | 44 | 86 | 30 | 13 | ||||||||
| Holly Blue | . | 1 | . | 2 | 2 | . | . | . | . | . | . | . | . | . | 1 | . | . | . | ||||||||
| Red Admiral | . | . | . | . | . | . | 1 | . | . | 1 | . | . | 1 | . | . | 1 | 1 | 2 | ||||||||
| Painted Lady | . | . | . | . | . | . | . | . | 1 | . | . | . | . | 1 | . | . | . | . | ||||||||
| Small Tortoiseshell | 3 | 1 | . | 2 | 1 | . | . | 2 | . | . | . | . | . | . | . | . | . | . | ||||||||
| Peacock | 14 | 10 | 1 | 1 | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | ||||||||
| Comma | 5 | . | 2 | 1 | . | . | . | . | 2 | 4 | 1 | 2 | 1 | 2 | . | . | . | 2 | ||||||||
| Speckled Wood | . | 4 | 17 | 21 | 3 | 9 | 13 | 4 | 3 | 2 | . | 28 | 45 | 19 | 9 | 21 | 13 | 10 | ||||||||
| Wall Brown | . | . | . | 2 | 11 | 9 | . | . | . | . | . | 3 | 37 | 32 | 11 | 1 | . | . | ||||||||
| Marbled White | . | . | . | . | . | . | . | . | 26 | 185 | 151 | 15 | 49 | 2 | . | . | . | . | ||||||||
| Gatekeeper/Hedge Brown | . | . | . | . | . | . | . | . | . | . | 16 | 63 | 37 | 14 | 1 | . | . | . | ||||||||
| Meadow Brown | . | . | . | . | . | . | . | 7 | 70 | 193 | 203 | 165 | 200 | 91 | 37 | 10 | . | 2 | ||||||||
| Small Heath | . | . | . | . | 15 | 24 | 9 | 25 | 20 | 8 | 6 | . | 2 | 1 | 3 | 17 | 6 | 4 | ||||||||
| Ringlet | . | . | . | . | . | . | . | . | 2 | 35 | 26 | 2 | . | . | . | . | . | . | ||||||||