
| 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 | . | . | . | . | . | . | . | . | . | 8 | 18 | 55 | 73 | 71 | 48 | 29 | 16 | 2 | . | . | . | . | . | . | ||
| Essex Skipper | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | ||
| Large Skipper | . | . | . | . | . | . | 1 | 11 | 21 | 13 | 2 | 2 | . | . | . | . | . | . | . | . | . | . | . | . | ||
| Dingy Skipper | . | . | . | 2 | 7 | 9 | 10 | 3 | 4 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | ||
| Grizzled Skipper | . | . | 5 | 10 | 11 | 17 | 11 | 11 | 2 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | ||
| Brimstone | 6 | 2 | . | . | . | 2 | . | . | . | . | . | . | . | 2 | 5 | 3 | 3 | . | 2 | . | 1 | 1 | 1 | 1 | ||
| Large White | . | . | . | 2 | 2 | 3 | 1 | . | 1 | . | . | . | . | . | 5 | 4 | 4 | . | . | 1 | 2 | . | . | . | ||
| Small White | . | . | 3 | 2 | . | 3 | . | 1 | 1 | . | . | 2 | 3 | 3 | 3 | 11 | 6 | 1 | 1 | 2 | 1 | 4 | 2 | 1 | ||
| Green-veined White | . | . | . | 2 | 2 | . | . | 1 | . | . | 1 | 2 | 5 | 3 | 8 | 7 | 5 | 2 | 1 | 5 | 2 | 1 | 1 | . | ||
| Orange Tip | . | . | . | . | 1 | 1 | . | . | . | . | . | . | . | 5 | . | . | . | . | . | . | . | . | . | . | ||
| Green Hairstreak | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | ||
| Purple Hairstreak | . | . | . | . | . | . | . | . | . | . | . | . | 5 | . | 2 | 1 | 2 | . | . | . | . | . | . | . | ||
| Small Copper | . | . | . | . | . | 3 | 3 | 2 | 2 | . | . | . | 1 | 2 | 9 | 8 | 8 | 7 | 8 | 4 | 4 | 2 | 2 | . | ||
| Brown Argus | . | . | . | . | . | . | . | . | 1 | 1 | . | . | . | . | 9 | 7 | 7 | 5 | 5 | 4 | 1 | . | . | . | ||
| Common Blue | . | . | . | . | . | 1 | 8 | 18 | 9 | 7 | 2 | . | . | . | 5 | 19 | 18 | 14 | 16 | 8 | 5 | 1 | 2 | . | ||
| Holly Blue | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | ||
| Duke of Burgundy Fritillary | . | . | . | 1 | 7 | 6 | 16 | 3 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | ||
| White Admiral | . | . | . | . | . | . | . | . | . | 5 | 7 | 11 | 1 | 7 | . | . | . | . | . | . | . | . | . | . | ||
| Red Admiral | . | . | . | . | . | . | . | . | 1 | 1 | . | . | . | . | . | 1 | 1 | 1 | 1 | . | 2 | 3 | . | 1 | ||
| Painted Lady | . | . | . | . | . | . | . | . | 1 | 1 | 1 | . | 1 | . | . | . | 1 | 1 | . | . | . | . | . | . | ||
| Small Tortoiseshell | . | . | . | . | . | . | . | 3 | 20 | 43 | 16 | 14 | 8 | 4 | 6 | 7 | 9 | 13 | 9 | 5 | 8 | 8 | 2 | 4 | ||
| Peacock | 6 | 8 | 8 | 4 | 3 | 5 | . | . | . | . | . | . | 6 | 12 | 34 | 24 | 21 | 3 | 5 | . | 2 | 1 | . | . | ||
| Comma | 3 | . | . | . | . | . | . | . | . | . | 2 | 5 | 3 | . | 2 | . | . | . | 1 | . | 3 | 3 | 2 | 2 | ||
| Small Pearl-bordered Fritillary | . | . | . | . | . | 7 | 9 | 17 | 6 | 3 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | ||
| Pearl-bordered Fritillary | . | . | . | 11 | 17 | 3 | 3 | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | ||
| Dark Green Fritillary | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | ||
| Silver-washed Fritillary | . | . | . | . | . | . | . | . | 1 | 2 | 6 | 14 | 11 | 15 | 8 | 4 | . | 2 | . | 1 | . | . | . | . | ||
| Marsh Fritillary | . | . | . | . | . | . | . | 5 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | ||
| Speckled Wood | . | . | 1 | 2 | 1 | 2 | 1 | 4 | 5 | 5 | 3 | 1 | . | 1 | 4 | 5 | 5 | 14 | 14 | 8 | 10 | 6 | 2 | . | ||
| Wall Brown | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | ||
| Marbled White | . | . | . | . | . | . | . | . | . | 2 | 20 | 43 | 50 | 34 | 27 | 7 | 1 | . | . | . | . | . | . | . | ||
| Gatekeeper/Hedge Brown | . | . | . | . | . | . | . | . | . | . | . | . | 7 | 49 | 77 | 88 | 81 | 45 | 21 | 22 | 18 | 2 | . | . | ||
| Meadow Brown | . | . | . | . | . | . | . | . | 7 | 19 | 22 | 41 | 42 | 38 | 27 | 15 | 1 | 1 | 1 | . | . | . | . | . | ||
| Small Heath | . | . | . | . | . | 6 | 8 | 9 | 3 | 3 | 2 | . | . | . | . | . | . | 3 | 2 | . | . | . | 1 | . | ||
| Ringlet | . | . | . | . | . | . | . | . | . | . | 36 | 99 | 53 | 36 | 12 | . | . | . | . | . | . | . | . | . | ||
| Unknown White | . | . | . | 1 | 2 | 1 | 4 | 3 | 3 | . | 1 | 2 | . | 5 | 9 | 6 | 4 | 1 | 2 | . | 1 | 1 | . | . | ||
| Unknown Fritillary | . | . | . | . | . | 9 | 14 | 6 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | ||