
| 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 | . | . | . | . | . | . | . | . | . | . | . | 6 | 28 | 16 | 67 | 24 | 16 | 4 | 2 | . | . | . | . | |||
| Essex Skipper | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 3 | 1 | . | . | . | . | . | |||
| Large Skipper | . | . | . | . | . | . | . | . | 7 | 12 | 21 | 40 | 11 | . | 6 | . | . | . | . | . | . | . | . | |||
| Dingy Skipper | . | . | . | 3 | 10 | 3 | 1 | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Grizzled Skipper | . | 1 | 2 | 5 | 11 | 3 | 2 | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Brimstone | 12 | . | 16 | 9 | 8 | 17 | 7 | 9 | 1 | 6 | 1 | 3 | 1 | . | 9 | 4 | 12 | 67 | 24 | 9 | 3 | 24 | 2 | |||
| Large White | . | . | . | . | . | . | 1 | 1 | 2 | . | . | 1 | 1 | . | . | 3 | 14 | 20 | 7 | 7 | 3 | 1 | . | |||
| Small White | . | . | . | . | 3 | . | . | . | . | . | . | 2 | 1 | 2 | 17 | 7 | 40 | 64 | 27 | 18 | 11 | 15 | . | |||
| Green-veined White | . | . | 3 | . | 2 | . | 1 | . | . | . | . | . | . | 1 | . | 1 | 6 | 5 | 1 | 2 | 1 | . | . | |||
| Orange Tip | 6 | . | 1 | 5 | 8 | 1 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Green Hairstreak | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Brown Hairstreak | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | 1 | . | |||
| Small Copper | . | . | . | 3 | 6 | 1 | 1 | 1 | . | 1 | . | 6 | 6 | 2 | 2 | 2 | 1 | 1 | 1 | 3 | 4 | 4 | . | |||
| Brown Argus | . | . | . | . | . | 1 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | |||
| Common Blue | . | . | . | . | . | 7 | 14 | 13 | 4 | 2 | . | . | . | 1 | 2 | 2 | 19 | 15 | 14 | 13 | 2 | . | . | |||
| Duke of Burgundy Fritillary | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | |||
| Red Admiral | . | . | . | . | . | 1 | 1 | . | . | . | 1 | 2 | 2 | . | . | 2 | 8 | 7 | . | 1 | . | 5 | . | |||
| Painted Lady | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Small Tortoiseshell | 1 | . | . | 2 | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | 1 | . | 8 | 1 | |||
| Peacock | 12 | 4 | 5 | 2 | . | . | . | . | . | . | . | . | . | . | 2 | 4 | 14 | 11 | . | 1 | . | . | . | |||
| Comma | . | . | 1 | . | . | . | . | . | . | . | . | . | 2 | . | 3 | . | 3 | 4 | 1 | . | 1 | 2 | . | |||
| Dark Green Fritillary | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | |||
| Silver-washed Fritillary | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | 2 | 3 | . | . | . | . | . | |||
| Speckled Wood | 1 | . | 3 | 22 | 10 | 6 | 6 | 10 | 9 | 11 | 10 | 7 | 2 | 1 | 7 | 14 | 25 | 15 | 17 | 18 | 14 | 23 | 2 | |||
| Wall Brown | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 6 | 3 | 4 | . | 1 | . | . | |||
| Marbled White | . | . | . | . | . | . | . | . | . | . | 3 | 4 | 2 | . | . | . | . | . | . | . | . | . | . | |||
| Gatekeeper/Hedge Brown | . | . | . | . | . | . | . | . | . | . | . | 7 | 10 | 17 | 33 | 40 | 32 | 14 | 5 | 3 | . | . | . | |||
| Meadow Brown | . | . | . | . | . | . | . | . | 2 | 6 | 14 | 53 | 82 | 87 | 155 | 141 | 240 | 214 | 212 | 170 | 111 | 25 | 1 | |||
| Small Heath | . | . | . | . | 1 | 1 | 3 | 3 | . | 5 | 3 | 7 | 4 | . | . | . | 1 | 2 | 12 | 9 | 4 | 3 | . | |||
| Ringlet | . | . | . | . | . | . | . | . | . | 1 | 36 | 104 | 99 | 15 | 13 | 1 | . | . | . | . | . | . | . | |||