
| 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 | . | . | . | . | . | . | . | . | . | 21 | 56 | 19 | 11 | 2 | . | . | . | . | ||||||||
| Essex Skipper | NI | . | . | . | . | . | . | . | . | 1 | 4 | 5 | 4 | 1 | . | . | . | . | . | ||||||||
| Silver-spotted Skipper | 72 | . | . | . | . | . | . | . | . | . | . | 1 | 8 | 19 | 23 | 11 | 6 | . | . | ||||||||
| Large Skipper | NI | . | . | . | . | . | . | . | 2 | 15 | 5 | 1 | 5 | 1 | . | . | . | . | . | ||||||||
| Dingy Skipper | NI | . | . | . | 2 | 1 | 3 | . | . | . | . | . | . | . | . | . | . | . | . | ||||||||
| Grizzled Skipper | NI | . | . | 4 | 2 | . | 2 | 3 | 4 | 1 | . | . | . | . | . | . | . | . | . | ||||||||
| Brimstone | 165 | 4 | 12 | 10 | 7 | 10 | 14 | 7 | 9 | 2 | 11 | 3 | 9 | 30 | 2 | 4 | 1 | . | 3 | ||||||||
| Large White | 24 | . | . | . | . | . | 2 | . | . | 1 | . | . | 2 | 10 | 1 | 6 | 1 | . | . | ||||||||
| Small White | NI | . | . | . | . | . | . | . | 1 | . | . | 9 | 27 | 66 | 20 | 41 | 10 | 5 | . | ||||||||
| Green-veined White | NI | . | 1 | 3 | 2 | 4 | 2 | 1 | . | 2 | . | 17 | 12 | 37 | 3 | 6 | 2 | . | . | ||||||||
| Orange Tip | NI | . | 1 | 2 | 2 | 3 | 4 | . | 1 | . | . | . | . | . | . | . | . | . | . | ||||||||
| Green Hairstreak | 14 | . | . | . | 1 | 1 | 4 | 3 | 1 | 1 | 1 | . | . | . | . | . | . | . | . | ||||||||
| Small Copper | 38 | . | . | . | . | 2 | . | . | . | . | . | 4 | 4 | 9 | 5 | . | 2 | 1 | 4 | ||||||||
| Brown Argus | 70 | . | . | . | 2 | 2 | 13 | 1 | 6 | 1 | . | 2 | 7 | 9 | 4 | 10 | 7 | . | . | ||||||||
| Common Blue | 251 | . | . | . | 1 | 2 | 33 | 21 | 25 | 11 | 9 | 3 | 19 | 32 | 44 | 22 | 13 | . | 1 | ||||||||
| Chalk-hill Blue | 83 | . | . | . | . | . | . | . | . | . | . | 22 | 22 | 17 | 8 | 1 | 1 | . | . | ||||||||
| Holly Blue | 11 | . | . | . | . | 1 | . | . | . | . | . | . | 3 | 3 | 2 | . | . | . | . | ||||||||
| Small Tortoiseshell | 165 | 1 | 1 | . | . | . | . | . | . | 15 | 12 | 7 | 1 | 3 | 17 | 43 | 27 | 4 | 3 | ||||||||
| Peacock | NI | 1 | 7 | 4 | . | . | 2 | . | 3 | . | . | 12 | 12 | 13 | 4 | . | . | . | 1 | ||||||||
| Dark Green Fritillary | NI | . | . | . | . | . | . | . | . | . | 2 | . | . | . | . | . | . | . | . | ||||||||
| Speckled Wood | 81 | . | . | 1 | 2 | 4 | 2 | 2 | 2 | 7 | 5 | 1 | 1 | 12 | 4 | 8 | 12 | 2 | 2 | ||||||||
| Wall Brown | 61 | . | . | . | . | 2 | 3 | 7 | 3 | 3 | . | . | . | 4 | 5 | 19 | 10 | . | . | ||||||||
| Marbled White | NI | . | . | . | . | . | . | . | . | 2 | 24 | 22 | 5 | . | . | . | . | . | . | ||||||||
| Gatekeeper / Hedge Brown | 266 | . | . | . | . | . | . | . | . | . | 1 | 37 | 69 | 54 | 42 | 17 | 5 | . | . | ||||||||
| Meadow Brown | 652 | . | . | . | . | . | . | . | . | 10 | 40 | 79 | 78 | 83 | 69 | 75 | 60 | 4 | . | ||||||||
| Small Heath | 318 | . | . | . | 2 | 2 | 9 | 21 | 26 | 42 | 52 | 17 | 10 | 7 | 12 | 23 | 14 | 1 | . | ||||||||
| Ringlet | NI | . | . | . | . | . | . | . | . | . | . | 16 | 4 | 2 | . | . | . | . | . | ||||||||