
| 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 | . | . | . | . | . | . | . | 5 | 20 | 10 | 55 | 41 | 28 | 10 | . | . | . | . | . | . | ||||||
| Essex Skipper | 102 | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | ||||||
| Large Skipper | NI | . | . | . | . | . | . | 17 | 20 | 14 | 6 | 5 | 3 | 2 | . | . | . | . | . | . | . | ||||||
| Clouded Yellow | 12 | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | 3 | 3 | 5 | . | . | . | ||||||
| Brimstone | 91 | 4 | . | 23 | 29 | 12 | 12 | . | . | . | . | 4 | 13 | 14 | 12 | 2 | 5 | 11 | 1 | . | . | ||||||
| Large White | 35 | . | . | . | . | 2 | . | . | . | 1 | . | 2 | 8 | 2 | 10 | 4 | . | . | . | 2 | 2 | ||||||
| Small White | 106 | . | . | . | . | . | . | . | . | 2 | . | 3 | 6 | 9 | 23 | 1 | 6 | 7 | 5 | 1 | . | ||||||
| Green-veined White | 37 | . | . | . | 2 | 5 | 6 | 2 | . | . | 3 | 1 | 7 | 11 | 4 | 8 | 1 | . | 1 | 2 | 1 | ||||||
| Orange Tip | NI | . | . | 5 | 8 | 10 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | ||||||
| Brown Hairstreak | 4 | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | 1 | 2 | . | . | ||||||
| Purple Hairstreak | NI | . | . | . | . | . | . | . | . | . | . | 1 | . | 2 | . | . | . | . | . | . | . | ||||||
| Small Copper | 26 | . | . | . | . | . | . | 1 | . | . | . | . | . | 3 | 6 | 6 | 2 | 3 | . | 2 | . | ||||||
| Brown Argus | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | ||||||
| Common Blue | 35 | . | . | . | . | . | . | 1 | . | . | . | . | . | 1 | 13 | 22 | 3 | 2 | . | . | . | ||||||
| Holly Blue | NI | . | . | . | . | . | 3 | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | ||||||
| White Admiral | 8 | . | . | . | . | . | . | . | . | 2 | 1 | . | . | . | . | . | . | . | . | . | . | ||||||
| Red Admiral | NI | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | 1 | . | . | . | 2 | 1 | ||||||
| Painted Lady | 4 | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | 1 | . | 2 | . | . | . | ||||||
| Small Tortoiseshell | 14 | 4 | . | 1 | . | . | . | . | . | . | . | . | 1 | . | . | 5 | 2 | 2 | . | . | . | ||||||
| Peacock | 47 | 7 | 6 | 1 | 4 | 1 | . | . | . | . | . | . | 6 | 8 | . | 3 | 1 | . | . | . | . | ||||||
| Comma | 55 | 7 | 1 | . | 3 | 1 | 1 | . | . | 1 | 3 | . | . | . | . | . | 3 | 9 | 5 | 13 | 1 | ||||||
| Silver-washed Fritillary | 179 | . | . | . | . | . | . | . | 12 | 24 | 53 | 35 | 32 | 19 | 23 | 5 | . | . | . | . | . | ||||||
| Marsh Fritillary | NI | . | . | . | . | . | 6 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | ||||||
| Speckled Wood | 184 | . | 5 | 16 | 9 | 8 | 18 | 29 | 1 | 3 | 1 | 2 | 13 | 7 | 26 | 36 | 29 | 24 | 15 | 9 | 3 | ||||||
| Marbled White | 94 | . | . | . | . | . | . | . | 15 | 17 | 14 | 11 | 19 | 1 | . | . | . | . | . | . | . | ||||||
| Gatekeeper / Hedge Brown | 555 | . | . | . | . | . | . | . | . | . | . | 40 | 95 | 110 | 140 | 14 | 1 | . | . | . | . | ||||||
| Meadow Brown | 673 | . | . | . | . | . | . | 20 | 118 | 95 | 65 | 64 | 58 | 30 | 35 | 39 | 3 | 3 | . | . | . | ||||||
| Ringlet | 378 | . | . | . | . | . | . | . | 36 | 51 | 97 | 55 | 91 | 31 | 17 | . | . | . | . | . | . | ||||||
| Five-spot Burnet | NI | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | ||||||
| Silver Y | NI | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | 3 | . | . | . | 2 | ||||||