
| 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 | 10 | 14 | 15 | 12 | 5 | 2 | . | . | . | |||
| Essex Skipper | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 2 | . | 1 | . | . | . | . | . | . | |||
| Large Skipper | . | . | . | . | . | . | . | . | . | 6 | 8 | 12 | 8 | 2 | 2 | 2 | 1 | . | . | . | . | . | . | |||
| Dingy Skipper | . | . | . | . | . | 1 | . | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Grizzled Skipper | . | . | . | 1 | . | 10 | 12 | 6 | 4 | 3 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Brimstone | 1 | 8 | 7 | 3 | . | . | . | . | . | . | . | . | . | . | . | . | 14 | 3 | 7 | 4 | 1 | . | 1 | |||
| Large White | . | . | . | 2 | 3 | 3 | 3 | 2 | 4 | 4 | 1 | . | 1 | . | 9 | . | 1 | 3 | 4 | 1 | . | 1 | . | |||
| Small White | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | 3 | 2 | . | 2 | 4 | . | 1 | . | . | |||
| Green-veined White | . | . | 1 | 4 | 5 | 2 | 11 | 4 | 5 | 2 | 1 | . | . | 4 | 17 | 17 | 13 | 4 | 12 | 6 | 2 | 1 | 1 | |||
| Orange Tip | . | . | 5 | 2 | 3 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Purple Hairstreak | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | 1 | . | . | . | . | . | . | . | |||
| Small Copper | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | 2 | 1 | 3 | . | . | . | |||
| Common Blue | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | 3 | . | . | |||
| Holly Blue | . | . | . | 3 | . | . | 1 | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | |||
| Duke of Burgundy Fritillary | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| White Admiral | . | . | . | . | . | . | . | . | . | . | . | 1 | 6 | 2 | 2 | 1 | 1 | . | . | . | . | . | . | |||
| Red Admiral | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | 1 | 1 | . | 1 | 2 | . | |||
| Painted Lady | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | 1 | . | . | 1 | 1 | 2 | . | . | . | |||
| Small Tortoiseshell | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | 2 | 3 | . | |||
| Peacock | 4 | 21 | 14 | 19 | 6 | 3 | . | . | . | . | . | . | . | . | 1 | 7 | 113 | 76 | 88 | 43 | 4 | 1 | 1 | |||
| Comma | 3 | . | 6 | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Pearl-bordered Fritillary | . | . | . | . | . | 1 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Silver-washed Fritillary | . | . | . | . | . | . | . | . | . | . | . | 1 | . | 1 | 4 | 1 | 2 | 5 | 2 | . | . | . | . | |||
| Marsh Fritillary | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Speckled Wood | . | . | 1 | 1 | 3 | 3 | 13 | 14 | 20 | 3 | 5 | 5 | 2 | 1 | 1 | 8 | . | 6 | 9 | 18 | 11 | 19 | 9 | |||
| Marbled White | . | . | . | . | . | . | . | . | . | . | 2 | 31 | 45 | 31 | 23 | 2 | 1 | . | . | . | . | . | . | |||
| Gatekeeper/Hedge Brown | . | . | . | . | . | . | . | . | . | . | . | . | 2 | 9 | 24 | 44 | 42 | 22 | 30 | 6 | . | . | . | |||
| Meadow Brown | . | . | . | . | . | . | . | . | 1 | 21 | 42 | 224 | 201 | 267 | 265 | 106 | 50 | 46 | 15 | 4 | . | . | . | |||
| Small Heath | . | . | . | . | . | 12 | 16 | 7 | . | 3 | 1 | 1 | 2 | . | . | . | . | . | . | 1 | . | . | . | |||
| Ringlet | . | . | . | . | . | . | . | . | . | . | 11 | 108 | 103 | 91 | 52 | 12 | 1 | 4 | . | . | . | . | . | |||