
| 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 | . | . | . | . | . | . | . | . | 18 | 6 | 1 | 1 | . | . | . | . | . | |||||||||
| Essex Skipper | . | . | . | . | . | . | . | 6 | . | 3 | . | . | . | . | . | . | . | |||||||||
| Large Skipper | . | . | . | . | . | . | 6 | 12 | 6 | 4 | 2 | . | . | . | . | . | . | |||||||||
| Brimstone | . | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||||||||
| Large White | . | 1 | 3 | 5 | 13 | 5 | 6 | 2 | 17 | 31 | 31 | 11 | 27 | 8 | 4 | 5 | 5 | |||||||||
| Small White | . | . | 4 | 2 | 2 | . | . | . | 8 | 9 | . | 2 | . | 3 | 4 | . | . | |||||||||
| Green-veined White | . | . | 20 | 10 | 10 | 8 | 2 | 22 | 5 | 16 | 23 | 10 | 1 | . | 1 | . | . | |||||||||
| Orange Tip | . | . | 13 | 2 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | |||||||||
| Purple Hairstreak | . | . | . | . | . | . | . | . | 11 | 10 | 3 | 6 | . | . | . | . | . | |||||||||
| White-letter Hairstreak | . | . | . | . | . | . | 1 | 29 | 11 | 7 | . | . | . | . | . | . | . | |||||||||
| Small Copper | . | . | . | . | 1 | . | 2 | . | . | . | . | 3 | 3 | 2 | . | . | . | |||||||||
| Brown Argus | . | . | . | . | . | . | . | . | . | . | 3 | 14 | 4 | . | . | . | . | |||||||||
| Common Blue | . | . | . | . | 1 | 3 | 6 | 1 | . | . | 1 | 14 | 17 | 9 | 3 | . | . | |||||||||
| Holly Blue | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||||||||
| Red Admiral | . | . | . | 2 | 4 | 8 | 3 | 4 | 11 | 24 | 4 | 5 | . | . | . | 4 | . | |||||||||
| Painted Lady | . | . | . | . | . | . | 1 | . | 1 | . | . | . | . | . | . | . | . | |||||||||
| Small Tortoiseshell | 2 | 51 | . | 1 | . | . | . | 3 | 9 | 8 | . | . | 2 | . | 1 | . | . | |||||||||
| Peacock | 5 | 48 | 23 | 4 | 3 | 1 | . | . | 2 | 23 | 5 | 3 | . | . | . | . | . | |||||||||
| Comma | . | . | 1 | 1 | 2 | 1 | . | 10 | 22 | 12 | 5 | 2 | 3 | 4 | 1 | 3 | 4 | |||||||||
| Speckled Wood | . | . | 4 | 1 | 3 | 12 | 5 | 1 | 2 | 7 | 5 | 5 | 49 | 23 | 37 | 8 | 2 | |||||||||
| Wall Brown | . | . | . | . | 2 | . | . | . | . | . | . | . | . | . | . | . | . | |||||||||
| Gatekeeper/Hedge Brown | . | . | . | . | . | . | . | . | 21 | 135 | 205 | 172 | 12 | 4 | . | . | . | |||||||||
| Meadow Brown | . | . | . | . | . | . | 13 | 59 | 105 | 145 | 128 | 143 | 28 | 13 | 4 | . | . | |||||||||
| Small Heath | . | . | . | 1 | 6 | 5 | 8 | 5 | 2 | . | 2 | 3 | 7 | 9 | 5 | 2 | . | |||||||||
| Ringlet | . | . | . | . | . | . | 4 | 27 | 85 | 44 | 17 | 4 | 2 | . | . | . | . | |||||||||
| Unknown White | . | . | . | . | . | . | . | . | 21 | . | . | . | . | . | . | . | . | |||||||||