
| 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 | NI | . | . | . | . | . | . | . | . | . | . | . | . | . | 26 | 59 | 96 | 88 | 33 | 33 | 15 | . | . | . | . | ||
| Essex Skipper | NI | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 3 | 1 | . | . | . | . | . | . | . | ||
| Large Skipper | 56 | . | . | . | . | . | . | . | . | . | . | 7 | 13 | 22 | 10 | 2 | 1 | . | 1 | . | . | . | . | . | . | ||
| Dingy Skipper | 18 | . | . | . | . | . | 1 | . | 4 | 6 | 4 | 3 | . | . | . | . | . | . | . | . | . | . | . | . | . | ||
| Grizzled Skipper | 27 | . | . | . | . | 5 | 3 | . | 3 | 5 | 5 | 5 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | ||
| Clouded Yellow | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | ||
| Brimstone | 30 | 5 | 10 | 3 | 2 | 2 | 2 | 1 | 1 | . | . | . | . | . | . | . | . | 1 | 2 | . | . | . | . | 1 | . | ||
| Large White | 11 | . | . | . | . | . | . | . | . | . | 2 | . | . | 1 | . | 1 | . | 2 | . | . | 1 | . | 1 | 1 | . | ||
| Small White | 43 | . | . | . | . | 2 | 3 | . | . | . | 3 | . | . | . | 1 | 1 | 2 | 4 | 5 | 4 | 5 | 2 | 2 | 2 | 2 | ||
| Green-veined White | 36 | . | . | . | . | . | 4 | 1 | 2 | . | 1 | 2 | 1 | . | 1 | . | 2 | 4 | 3 | 2 | 5 | 2 | 1 | . | . | ||
| Orange Tip | 4 | . | . | . | . | 1 | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | ||
| Green Hairstreak | 1 | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | ||
| Purple Hairstreak | 8 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | 2 | 2 | . | 2 | . | . | . | . | ||
| Small Copper | 42 | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | 5 | 4 | 6 | 7 | 3 | 3 | 4 | 4 | ||
| Brown Argus | 33 | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | 5 | 3 | 8 | 6 | 3 | 1 | 1 | . | ||
| Common Blue | 216 | . | . | . | . | . | . | . | . | . | 1 | 7 | 13 | 8 | 2 | . | . | 2 | 19 | 41 | 40 | 23 | 22 | 6 | . | ||
| Chalk-hill Blue | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | ||
| Holly Blue | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | ||
| Duke of Burgundy Fritillary | 27 | . | . | . | . | . | . | 5 | 7 | 4 | 7 | 4 | . | . | . | . | . | . | . | . | . | . | . | . | . | ||
| White Admiral | 18 | . | . | . | . | . | . | . | . | . | . | . | . | . | 5 | 6 | 3 | 1 | 1 | 2 | . | . | . | . | . | ||
| Red Admiral | 3 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | 1 | 1 | . | ||
| Small Tortoiseshell | 240 | . | 2 | 1 | . | . | . | . | . | . | . | . | 3 | 58 | 62 | 42 | 9 | 5 | 7 | 18 | 15 | 4 | 2 | . | 2 | ||
| Peacock | 156 | 1 | 4 | 7 | 3 | 4 | 4 | 3 | 3 | . | 1 | . | . | . | . | . | 4 | 49 | 46 | 12 | 8 | . | 1 | 1 | 1 | ||
| Comma | 15 | . | 1 | 1 | . | . | 1 | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | 1 | 1 | 3 | 4 | ||
| Small Pearl-bordered Fritillary | 26 | . | . | . | . | . | . | . | . | 3 | 4 | 6 | 5 | 6 | . | 2 | . | . | . | . | . | . | . | . | . | ||
| Pearl-bordered Fritillary | 39 | . | . | . | . | 1 | 9 | 8 | 10 | 2 | 7 | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | ||
| Dark Green Fritillary | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 2 | . | . | . | . | . | . | . | . | . | ||
| Silver-washed Fritillary | 37 | . | . | . | . | . | . | . | . | . | . | . | . | 2 | 4 | 5 | 4 | 5 | 7 | 4 | 4 | . | . | . | . | ||
| Marsh Fritillary | 2 | . | . | . | . | . | . | . | 1 | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | ||
| Speckled Wood | 94 | . | . | . | . | 1 | . | . | 1 | 1 | 1 | 2 | 2 | 5 | 4 | . | . | . | 3 | 4 | 4 | 18 | 15 | 9 | 12 | ||
| Wall Brown | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | ||
| Marbled White | 177 | . | . | . | . | . | . | . | . | . | . | . | . | . | 25 | 39 | 62 | 42 | 6 | 3 | . | . | . | . | . | ||
| Gatekeeper / Hedge Brown | 748 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | 31 | 79 | 138 | 133 | 186 | 50 | 11 | 1 | . | ||
| Meadow Brown | 186 | . | . | . | . | . | . | . | . | . | . | . | 3 | 28 | 52 | 22 | 33 | 26 | 14 | 2 | 4 | . | . | . | . | ||
| Small Heath | 10 | . | . | . | . | . | . | . | . | . | . | . | 2 | 3 | 1 | . | 1 | 1 | . | . | . | 1 | . | . | . | ||
| Ringlet | 168 | . | . | . | . | . | . | . | . | . | . | . | . | 1 | 19 | 27 | 70 | 38 | 7 | 4 | 1 | . | . | . | . | ||