
| 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 | 52 | 140 | 34 | 26 | 21 | 4 | 2 | 1 | . | . | . | |||||||
| Essex Skipper | . | . | . | . | . | . | . | 2 | 11 | 82 | . | 15 | . | . | . | . | . | . | . | |||||||
| Silver-spotted Skipper | . | . | . | . | . | . | . | . | . | . | . | 16 | 29 | 7 | 5 | 1 | 1 | . | . | |||||||
| Large Skipper | . | . | . | . | . | . | 3 | 13 | 22 | 8 | 1 | 3 | 4 | . | . | . | . | . | . | |||||||
| Dingy Skipper | . | . | 36 | 14 | 15 | 5 | 6 | . | . | . | . | . | . | . | . | . | . | . | . | |||||||
| Grizzled Skipper | . | 1 | 5 | 2 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||||||
| Brimstone | 9 | 17 | 10 | 6 | 9 | 7 | . | . | 3 | . | 2 | 12 | 43 | 16 | 6 | . | . | 3 | 3 | |||||||
| Large White | . | . | . | . | . | . | . | . | . | . | 2 | . | 12 | 3 | 4 | 1 | . | . | . | |||||||
| Small White | . | . | . | . | . | . | . | . | . | . | 5 | 18 | 37 | 10 | 13 | 1 | . | 1 | . | |||||||
| Green-veined White | . | . | 2 | . | 3 | . | . | . | . | . | 1 | 12 | 15 | 1 | 2 | . | . | . | . | |||||||
| Orange Tip | . | . | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||||||
| Green Hairstreak | . | . | 1 | 1 | 1 | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | |||||||
| Purple Hairstreak | . | . | . | . | . | . | . | . | . | . | 1 | . | . | 1 | . | . | . | . | . | |||||||
| Small Copper | . | . | . | . | . | . | . | . | . | . | 1 | 1 | . | . | . | . | . | . | 1 | |||||||
| Brown Argus | . | . | . | 2 | . | 1 | . | . | . | . | . | 1 | 4 | 4 | 1 | 5 | . | 1 | . | |||||||
| Common Blue | . | . | . | 20 | 44 | 73 | 77 | 4 | 3 | 1 | 4 | 12 | 48 | 70 | 72 | 34 | 11 | 4 | 1 | |||||||
| Chalk-hill Blue | . | . | . | . | . | . | . | . | . | . | 6 | 10 | 5 | 4 | 1 | . | . | . | . | |||||||
| Holly Blue | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | |||||||
| Red Admiral | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | |||||||
| Small Tortoiseshell | . | . | . | . | . | . | . | 1 | 5 | 5 | 2 | 3 | . | 37 | 9 | 8 | 9 | 5 | 1 | |||||||
| Peacock | 3 | 1 | . | . | . | . | . | . | . | . | 7 | 8 | 14 | 2 | . | . | . | . | . | |||||||
| Comma | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | 1 | 1 | 1 | |||||||
| Dark Green Fritillary | . | . | . | . | . | . | . | . | . | . | 2 | 2 | . | . | . | . | . | . | . | |||||||
| Speckled Wood | . | . | 3 | 2 | 3 | 3 | 1 | . | 3 | 3 | . | 1 | 1 | 3 | 2 | 4 | 6 | 7 | 3 | |||||||
| Wall Brown | . | . | 1 | 5 | 5 | 3 | 3 | . | . | . | . | . | 5 | 5 | 9 | 7 | . | 1 | . | |||||||
| Marbled White | . | . | . | . | . | . | . | 1 | 70 | 124 | 28 | 24 | 9 | 2 | . | . | . | . | . | |||||||
| Gatekeeper/Hedge Brown | . | . | . | . | . | . | . | . | . | 2 | 23 | 27 | 28 | 10 | 5 | . | . | . | . | |||||||
| Meadow Brown | . | . | . | . | . | . | 1 | 9 | 63 | 84 | 97 | 167 | 194 | 124 | 116 | 97 | 51 | 24 | 6 | |||||||
| Small Heath | . | . | 1 | 2 | 7 | 18 | 24 | 23 | 27 | 37 | 12 | 4 | 15 | 21 | 28 | 14 | 4 | . | . | |||||||
| Ringlet | . | . | . | . | . | . | . | . | 4 | 31 | 13 | 5 | 2 | . | . | . | . | . | . | |||||||