
| 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/Essex Skipper | . | . | . | . | . | . | . | . | . | 7 | 4 | 7 | 7 | 2 | . | 1 | . | . | . | |||||||
| Silver-spotted Skipper | . | . | . | . | . | . | . | . | . | . | 3 | 16 | 35 | . | 11 | 2 | . | . | . | |||||||
| Large Skipper | . | . | . | . | . | . | . | . | . | . | . | 9 | 23 | 8 | 2 | . | . | . | . | |||||||
| Dingy Skipper | . | . | . | 1 | 6 | 4 | 2 | . | 1 | . | . | . | . | . | . | . | . | . | . | |||||||
| Grizzled Skipper | . | . | . | 1 | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | |||||||
| Brimstone | 2 | . | . | . | . | 6 | 2 | . | 2 | 1 | . | 5 | 1 | 5 | 2 | 6 | . | . | . | |||||||
| Large White | . | . | . | . | 1 | . | . | 1 | . | . | 3 | 10 | 15 | 6 | 1 | 13 | . | . | . | |||||||
| Small White | . | . | 1 | . | 1 | 1 | . | 1 | . | . | 1 | 23 | 22 | 9 | 4 | 15 | 10 | 3 | . | |||||||
| Green-veined White | . | . | . | . | . | 2 | . | . | . | . | 4 | 11 | 11 | 5 | 1 | . | . | . | . | |||||||
| Green Hairstreak | . | . | . | . | . | 6 | . | . | . | . | . | . | . | . | . | . | . | . | . | |||||||
| Small Copper | . | . | . | . | . | . | . | . | . | . | . | 1 | . | 1 | . | . | . | . | . | |||||||
| Brown Argus | . | . | . | . | . | . | . | 1 | . | . | . | 5 | 3 | 9 | 3 | 2 | . | . | . | |||||||
| Common Blue | . | . | . | . | . | 5 | 16 | 19 | 10 | 1 | . | 2 | 13 | 47 | 67 | 61 | 27 | 11 | . | |||||||
| Chalk-hill Blue | . | . | . | . | . | . | . | . | . | . | 16 | 35 | 31 | 37 | 6 | . | . | . | . | |||||||
| Red Admiral | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | |||||||
| Small Tortoiseshell | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | |||||||
| Peacock | 2 | 1 | . | . | . | . | . | . | . | . | 1 | 2 | . | . | 1 | . | . | . | . | |||||||
| Comma | . | . | . | . | . | . | . | . | . | . | 1 | 1 | . | . | . | . | . | . | . | |||||||
| Speckled Wood | . | . | 1 | 1 | . | . | 1 | . | 2 | 1 | 2 | . | . | . | . | 2 | 7 | 3 | 1 | |||||||
| Marbled White | . | . | . | . | . | . | . | . | . | 7 | 11 | 16 | . | 1 | . | . | . | . | . | |||||||
| Gatekeeper/Hedge Brown | . | . | . | . | . | . | . | . | . | . | 10 | 27 | 28 | 19 | 9 | . | . | . | . | |||||||
| Meadow Brown | . | . | . | . | . | . | . | . | 9 | 9 | 94 | 247 | 251 | 210 | 108 | 149 | 91 | 48 | 3 | |||||||
| Small Heath | . | . | . | 1 | 2 | 6 | 14 | 21 | 19 | 22 | . | 7 | 3 | 5 | 11 | 28 | 37 | 8 | . | |||||||
| Ringlet | . | . | . | . | . | . | . | . | 1 | 13 | 3 | . | . | . | . | . | . | . | . | |||||||