
| 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 | . | . | . | . | . | 2 | 5 | 10 | 7 | 12 | 3 | 5 | . | . | . | . | . | |||||||||
| Essex Skipper | NI | . | . | . | . | . | . | . | 2 | 2 | 4 | 1 | . | . | . | . | . | . | |||||||||
| Large Skipper | NI | . | . | . | . | . | 3 | 5 | 9 | 6 | 7 | . | . | . | . | . | . | . | |||||||||
| Grizzled Skipper | NI | . | 6 | 2 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | |||||||||
| Clouded Yellow | NI | . | . | . | . | . | . | . | . | . | . | 1 | . | 1 | 1 | 5 | 1 | . | |||||||||
| Brimstone | NI | 7 | 6 | 6 | 2 | . | . | . | 2 | 9 | 8 | 8 | 8 | 1 | 1 | 3 | 1 | 2 | |||||||||
| Large White | NI | . | . | . | . | . | . | . | 3 | 5 | 19 | 15 | 16 | 4 | 7 | 9 | 6 | 4 | |||||||||
| Small White | NI | . | 1 | . | . | . | . | . | . | . | 2 | 2 | 2 | . | 2 | 3 | . | . | |||||||||
| Green-veined White | NI | 4 | 3 | 3 | 1 | . | . | 1 | 2 | 3 | 9 | 12 | 9 | 5 | 5 | 8 | 1 | . | |||||||||
| Green Hairstreak | NI | . | . | 3 | 2 | 3 | 2 | . | . | . | . | . | . | . | . | . | . | . | |||||||||
| Small Copper | NI | . | 1 | 3 | 1 | 1 | . | 1 | . | 4 | 5 | 6 | 5 | 3 | 2 | 4 | 1 | 2 | |||||||||
| Silver-studded Blue | NI | . | . | 3 | 14 | 17 | 10 | 11 | 8 | 6 | 6 | 13 | 18 | 9 | 5 | 5 | . | . | |||||||||
| Brown Argus | NI | . | . | 3 | 10 | . | 2 | . | . | . | 8 | 4 | 15 | 11 | 4 | 8 | 1 | 2 | |||||||||
| Common Blue | NI | . | . | 9 | 53 | 27 | 9 | . | . | . | . | 8 | 31 | 12 | 6 | 19 | 4 | 4 | |||||||||
| Holly Blue | NI | . | 2 | . | 1 | 2 | . | . | . | . | 3 | 2 | 3 | 2 | . | . | . | . | |||||||||
| Red Admiral | NI | . | . | . | . | . | . | . | . | . | 1 | 1 | . | . | . | . | 1 | . | |||||||||
| Small Tortoiseshell | NI | 3 | . | 1 | . | . | . | 4 | . | 1 | 2 | . | 1 | . | 2 | 2 | 1 | . | |||||||||
| Peacock | NI | 5 | . | 1 | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | |||||||||
| Comma | NI | . | . | . | . | . | . | . | . | . | . | . | 2 | . | 1 | 1 | . | . | |||||||||
| Speckled Wood | NI | . | 3 | 1 | 1 | . | 1 | . | 1 | 1 | . | 1 | 1 | 5 | 2 | 2 | 1 | 1 | |||||||||
| Marbled White | NI | . | . | . | . | . | . | . | 2 | . | . | . | . | . | . | . | . | . | |||||||||
| Grayling | NI | . | . | . | . | . | . | . | 5 | 43 | 62 | 107 | 187 | 91 | 56 | 37 | 16 | 4 | |||||||||
| Gatekeeper / Hedge Brown | NI | . | . | . | . | . | . | . | . | 46 | 97 | 267 | 185 | 91 | 14 | 6 | 1 | . | |||||||||
| Meadow Brown | NI | . | . | . | . | . | 7 | 23 | 62 | 77 | 95 | 185 | 193 | 104 | 63 | 33 | 10 | 4 | |||||||||
| Small Heath | NI | . | . | . | 3 | 8 | 112 | 107 | 141 | 62 | 39 | 38 | 11 | 4 | 14 | 26 | 21 | 8 | |||||||||
| Ringlet | NI | . | . | . | . | . | . | 3 | 3 | 3 | 3 | 1 | 2 | . | . | . | . | . | |||||||||