
| 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 | Ind | ||||||||||||||||||||||||||
| Small Skipper | 62 | . | . | . | . | . | . | . | . | . | . | . | . | . | 6 | 10 | 14 | 15 | 12 | 5 | 2 | . | . | . | |||
| Essex Skipper | 3 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 2 | . | 1 | . | . | . | . | . | . | |||
| Large Skipper | 41 | . | . | . | . | . | . | . | . | . | 6 | 8 | 12 | 8 | 2 | 2 | 2 | 1 | . | . | . | . | . | . | |||
| Dingy Skipper | 3 | . | . | . | . | . | 1 | . | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Grizzled Skipper | 37 | . | . | . | 1 | . | 10 | 12 | 6 | 4 | 3 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Brimstone | 57 | 1 | 8 | 7 | 3 | . | . | . | . | . | . | . | . | . | . | . | . | 14 | 3 | 7 | 4 | 1 | . | 1 | |||
| Large White | 42 | . | . | . | 2 | 3 | 3 | 3 | 2 | 4 | 4 | 1 | . | 1 | . | 9 | . | 1 | 3 | 4 | 1 | . | 1 | . | |||
| Small White | 14 | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | 3 | 2 | . | 2 | 4 | . | 1 | . | . | |||
| Green-veined White | 113 | . | . | 1 | 4 | 5 | 2 | 11 | 4 | 5 | 2 | 1 | . | . | 4 | 17 | 17 | 13 | 4 | 12 | 6 | 2 | 1 | 1 | |||
| Orange Tip | 10 | . | . | 5 | 2 | 3 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Purple Hairstreak | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | 1 | . | . | . | . | . | . | . | |||
| Small Copper | 7 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | 2 | 1 | 3 | . | . | . | |||
| Common Blue | 5 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | 3 | . | . | |||
| Holly Blue | 5 | . | . | . | 3 | . | . | 1 | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | |||
| Duke of Burgundy Fritillary | 1 | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| White Admiral | 13 | . | . | . | . | . | . | . | . | . | . | . | 1 | 6 | 2 | 2 | 1 | 1 | . | . | . | . | . | . | |||
| Red Admiral | 8 | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | 1 | 1 | . | 1 | 2 | . | |||
| Painted Lady | 6 | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | 1 | . | . | 1 | 1 | 2 | . | . | . | |||
| Small Tortoiseshell | 8 | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | 2 | 3 | . | |||
| Peacock | 427 | 4 | 21 | 14 | 19 | 6 | 3 | . | . | . | . | . | . | . | . | 1 | 7 | 113 | 76 | 88 | 43 | 4 | 1 | 1 | |||
| Comma | 12 | 3 | . | 6 | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Pearl-bordered Fritillary | 2 | . | . | . | . | . | 1 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Silver-washed Fritillary | 16 | . | . | . | . | . | . | . | . | . | . | . | 1 | . | 1 | 4 | 1 | 2 | 5 | 2 | . | . | . | . | |||
| Marsh Fritillary | 1 | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Speckled Wood | 167 | . | . | 1 | 1 | 3 | 3 | 13 | 14 | 20 | 3 | 5 | 5 | 2 | 1 | 1 | 8 | . | 6 | 9 | 18 | 11 | 19 | 9 | |||
| Marbled White | 135 | . | . | . | . | . | . | . | . | . | . | 2 | 31 | 45 | 31 | 23 | 2 | 1 | . | . | . | . | . | . | |||
| Gatekeeper / Hedge Brown | 179 | . | . | . | . | . | . | . | . | . | . | . | . | 2 | 9 | 24 | 44 | 42 | 22 | 30 | 6 | . | . | . | |||
| Meadow Brown | 1242 | . | . | . | . | . | . | . | . | 1 | 21 | 42 | 224 | 201 | 267 | 265 | 106 | 50 | 46 | 15 | 4 | . | . | . | |||
| Small Heath | 43 | . | . | . | . | . | 12 | 16 | 7 | . | 3 | 1 | 1 | 2 | . | . | . | . | . | . | 1 | . | . | . | |||
| Ringlet | 382 | . | . | . | . | . | . | . | . | . | . | 11 | 108 | 103 | 91 | 52 | 12 | 1 | 4 | . | . | . | . | . | |||