
| 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 | . | . | . | . | . | . | 1 | 11 | 12 | . | 6 | 1 | . | . | . | . | . | . | . | |||||||
| Essex Skipper | . | . | . | . | . | . | . | 2 | 25 | . | 11 | . | . | . | . | . | . | . | . | |||||||
| Large Skipper | . | . | . | . | . | 11 | 10 | 23 | 5 | 8 | 3 | 2 | . | . | . | . | . | . | . | |||||||
| Large White | . | 2 | 3 | 7 | 5 | 21 | 7 | 7 | 5 | 5 | 6 | 1 | 6 | 6 | 1 | 3 | . | . | . | |||||||
| Small White | . | . | . | 5 | . | 4 | . | 6 | 4 | 1 | 5 | 1 | 8 | 14 | 8 | . | . | . | . | |||||||
| Green-veined White | 6 | 4 | 3 | 12 | 11 | 6 | . | 24 | 10 | 2 | 24 | 15 | 3 | 6 | 4 | 24 | 7 | 5 | 1 | |||||||
| Orange Tip | . | 1 | 9 | 4 | 4 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | |||||||
| White-letter Hairstreak | . | . | . | . | . | . | 20 | 18 | 5 | 2 | . | . | . | . | . | . | . | . | . | |||||||
| Small Copper | . | . | . | . | . | . | 8 | . | . | . | 1 | . | . | . | 5 | 6 | 7 | 3 | 5 | |||||||
| Brown Argus | . | . | . | . | . | . | . | . | . | . | . | 1 | 4 | 3 | 7 | . | . | . | . | |||||||
| Common Blue | . | . | . | . | . | . | . | . | . | . | . | 1 | 5 | 9 | 20 | 3 | 1 | 1 | . | |||||||
| Holly Blue | . | . | . | . | . | . | . | . | . | 2 | 5 | . | 1 | 1 | . | . | . | . | 1 | |||||||
| Red Admiral | . | . | . | . | . | 3 | . | 5 | 3 | 1 | 1 | . | . | 1 | 1 | 1 | 1 | 4 | 1 | |||||||
| Small Tortoiseshell | . | . | . | . | . | . | . | 1 | . | . | . | . | 2 | 1 | 4 | 1 | . | . | . | |||||||
| Peacock | 8 | 8 | 6 | 8 | 5 | . | . | 1 | 27 | 16 | 11 | 1 | 3 | . | . | 2 | . | 1 | 1 | |||||||
| Comma | . | . | 1 | 1 | . | . | 4 | 28 | 14 | 11 | 20 | 7 | 6 | 4 | 2 | 4 | 3 | 13 | 4 | |||||||
| Speckled Wood | . | 1 | 6 | . | 3 | 4 | 7 | 6 | 6 | 5 | 9 | 14 | 3 | 40 | 31 | 32 | 28 | 15 | 6 | |||||||
| Wall Brown | . | . | . | 3 | 1 | . | . | . | . | . | . | 18 | 10 | 2 | . | . | . | 6 | 2 | |||||||
| Gatekeeper/Hedge Brown | . | . | . | . | . | . | . | 9 | 91 | 40 | 161 | 97 | 50 | 17 | 2 | . | . | . | . | |||||||
| Meadow Brown | . | . | . | . | . | . | 49 | 102 | 92 | 104 | 156 | 61 | 60 | 18 | 4 | . | . | . | . | |||||||
| Small Heath | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | |||||||
| Ringlet | . | . | . | . | . | . | 41 | 87 | 151 | 21 | 45 | 1 | . | . | . | . | . | . | . | |||||||
| Unknown White | . | 7 | 9 | 1 | . | . | 1 | . | . | 33 | . | . | . | . | . | . | . | . | . | |||||||