
| 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 | . | . | . | . | . | . | . | . | . | 3 | 1 | 3 | 1 | 2 | . | . | . | . | . | |||||||
| Essex Skipper | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | |||||||
| Large Skipper | . | . | . | . | . | . | 19 | 18 | 20 | 16 | 50 | 2 | . | . | . | . | . | . | . | |||||||
| Brimstone | 17 | 1 | 4 | 3 | 3 | 1 | 1 | . | . | . | 6 | 6 | . | . | 31 | 35 | 7 | 3 | 3 | |||||||
| Large White | . | . | . | 1 | 13 | 13 | 3 | 4 | . | 9 | 19 | 29 | 33 | 21 | 6 | 2 | 2 | . | . | |||||||
| Small White | . | . | . | . | . | . | . | . | . | 6 | 3 | 11 | 26 | 15 | 61 | 66 | 20 | 4 | 5 | |||||||
| Green-veined White | . | . | 3 | 6 | 13 | 15 | 3 | 3 | 28 | 60 | 82 | 63 | 51 | 21 | 15 | 13 | 16 | 1 | . | |||||||
| Orange Tip | . | . | 1 | . | 6 | 6 | . | . | . | . | . | . | . | . | . | . | . | . | . | |||||||
| Purple Hairstreak | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | |||||||
| Common Blue | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | |||||||
| Red Admiral | . | . | . | . | . | . | . | 1 | . | 2 | 6 | 2 | 4 | 9 | 5 | 3 | 3 | 1 | 2 | |||||||
| Painted Lady | . | . | . | . | . | . | . | . | . | . | . | 2 | 4 | 5 | 3 | . | . | 3 | . | |||||||
| Small Tortoiseshell | 1 | . | . | . | . | . | 4 | 1 | 1 | 3 | 1 | . | . | 11 | 22 | 21 | 20 | 6 | . | |||||||
| Peacock | 11 | 4 | 13 | 1 | 1 | 3 | . | . | . | . | 26 | 95 | 31 | 72 | 39 | 6 | 1 | . | 1 | |||||||
| Comma | 21 | . | 1 | . | . | 2 | . | 3 | 7 | 2 | 3 | . | . | . | 2 | 2 | 2 | 1 | 3 | |||||||
| Wall Brown | . | . | . | . | . | . | . | . | . | . | . | 6 | 14 | 7 | 1 | . | . | . | . | |||||||
| Gatekeeper/Hedge Brown | . | . | . | . | . | . | . | . | 3 | 25 | 90 | 118 | 61 | 39 | 4 | . | . | . | . | |||||||
| Meadow Brown | . | . | . | . | . | . | 10 | 32 | 86 | 81 | 75 | 83 | 38 | 24 | 2 | 1 | . | . | . | |||||||
| Small Heath | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | |||||||
| Ringlet | . | . | . | . | . | . | 1 | 95 | 243 | 158 | 78 | 27 | 5 | . | . | . | . | . | . | |||||||