
| 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 | . | . | . | . | . | . | . | . | . | 2 | 65 | 136 | 22 | 22 | 9 | . | . | . | . | . | ||||||
| Essex Skipper | . | . | . | . | . | . | . | . | . | . | . | 4 | 22 | 2 | . | . | . | . | . | . | ||||||
| Large Skipper | . | . | . | . | . | . | . | . | 7 | 8 | 11 | 5 | 2 | 3 | . | . | . | . | . | . | ||||||
| Brimstone | 2 | . | 1 | . | . | . | . | . | . | . | . | . | . | . | 1 | 1 | . | 1 | . | . | ||||||
| Large White | . | . | . | . | 3 | . | 2 | 6 | . | . | . | . | 3 | 22 | 2 | . | 1 | 2 | . | . | ||||||
| Small White | . | . | . | 1 | . | . | . | . | . | . | . | . | 2 | 10 | 4 | 3 | 2 | 2 | . | . | ||||||
| Green-veined White | . | . | 4 | 4 | 9 | 1 | . | . | . | . | . | . | . | 3 | 3 | 5 | 2 | 3 | . | . | ||||||
| Orange Tip | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | ||||||
| Purple Hairstreak | . | . | . | . | . | . | . | . | . | . | . | . | 2 | 1 | . | 1 | . | . | . | . | ||||||
| Common Blue | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 2 | 4 | 3 | 4 | . | . | ||||||
| White Admiral | . | . | . | . | . | . | . | . | . | . | . | . | 2 | . | . | . | . | . | . | . | ||||||
| Red Admiral | . | . | . | . | . | . | . | . | . | 1 | 2 | . | . | . | . | . | . | . | . | . | ||||||
| Small Tortoiseshell | 3 | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | 2 | . | . | 1 | . | ||||||
| Peacock | 4 | 3 | 1 | . | . | . | . | . | . | . | . | . | . | 5 | 12 | 7 | 2 | 2 | . | . | ||||||
| Comma | 5 | 5 | . | 1 | . | . | . | . | . | . | . | 2 | 2 | . | 1 | 1 | . | . | 2 | . | ||||||
| Pearl-bordered Fritillary | . | . | . | . | 9 | 3 | 5 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | ||||||
| Heath Fritillary | . | . | . | . | . | . | . | 1 | 23 | 45 | 26 | 29 | 1 | . | . | . | . | . | . | . | ||||||
| Speckled Wood | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | ||||||
| Wall Brown | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 9 | 2 | 3 | . | . | . | ||||||
| Gatekeeper/Hedge Brown | . | . | . | . | . | . | . | . | . | . | . | 3 | 43 | 105 | 107 | 52 | 9 | 11 | . | . | ||||||
| Meadow Brown | . | . | . | . | . | . | . | . | . | 5 | 21 | 31 | 26 | 20 | 14 | 4 | . | . | . | . | ||||||
| Small Heath | . | . | . | . | . | . | 1 | 4 | 4 | 3 | . | 1 | . | 1 | . | 3 | 3 | 1 | . | . | ||||||
| Ringlet | . | . | . | . | . | . | . | . | . | 5 | 141 | 171 | 77 | 51 | 5 | . | . | . | . | . | ||||||
| Unknown White | . | . | . | . | . | . | . | 2 | 1 | . | . | 1 | . | 6 | 3 | 1 | . | 1 | . | . | ||||||