
| 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 | ||||||||||||||||||||||||||
| Large Skipper | NI | . | . | . | . | . | . | . | . | 4 | 4 | 14 | 11 | 21 | 9 | 3 | . | . | . | . | . | . | . | . | . | . | |
| Dingy Skipper | NI | . | . | . | . | . | . | 7 | 9 | 21 | 5 | 10 | 1 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | |
| Clouded Yellow | NI | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | 7 | . | . | 2 | . | . | . | . | |
| Brimstone | NI | 1 | . | 7 | 9 | 12 | 13 | 11 | 3 | 11 | 1 | 7 | 1 | 2 | 1 | 1 | 2 | 6 | . | 6 | 12 | 5 | 2 | 11 | . | 2 | |
| Large White | NI | . | . | . | . | . | 1 | 3 | . | 1 | 1 | 1 | . | . | . | 2 | 1 | . | . | . | . | 1 | . | . | . | . | |
| Small White | NI | . | . | . | . | 1 | . | . | . | . | 2 | 1 | . | . | 5 | 12 | 1 | . | 5 | 1 | 1 | 2 | 4 | 2 | 1 | . | |
| Green-veined White | NI | . | . | . | . | 1 | 9 | 15 | 13 | 12 | . | 9 | 1 | 1 | 7 | 32 | 6 | 11 | . | 2 | 2 | . | . | . | . | 1 | |
| Orange Tip | NI | . | . | . | . | 3 | 4 | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |
| Green Hairstreak | NI | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |
| Purple Hairstreak | NI | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | |
| Small Copper | NI | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | |
| Northern Brown Argus | NI | . | . | . | . | . | . | . | . | . | . | 4 | 6 | 37 | 40 | 22 | 3 | 1 | . | . | . | . | . | . | . | . | |
| Common Blue | NI | . | . | . | . | . | . | . | 4 | 4 | 12 | 13 | 22 | 12 | 11 | 9 | 1 | . | . | 2 | 5 | 2 | 1 | 1 | . | . | |
| Holly Blue | NI | . | . | . | . | . | . | 2 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |
| Duke of Burgundy Fritillary | NI | . | . | . | . | . | . | 2 | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |
| Red Admiral | NI | . | . | . | . | . | . | . | . | . | . | . | 2 | . | . | . | 1 | . | 28 | 1 | 2 | 1 | 7 | 2 | 2 | 11 | |
| Painted Lady | NI | . | . | . | . | . | . | . | . | . | . | . | 1 | 1 | 1 | . | . | . | . | . | 5 | 4 | 3 | 2 | 1 | . | |
| Small Tortoiseshell | NI | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | 3 | . | . | 1 | . | . | . | . | 1 | . | 1 | |
| Peacock | NI | 2 | 11 | 11 | 15 | 21 | 4 | 8 | 1 | 5 | 2 | 1 | 1 | . | . | . | 3 | 7 | 2 | 8 | 25 | 6 | 5 | 9 | . | 2 | |
| Comma | NI | 5 | 2 | 2 | . | 2 | . | 1 | . | . | 1 | . | . | . | . | . | . | 1 | . | 1 | 4 | 2 | . | . | . | 2 | |
| Small Pearl-bordered Fritillary | NI | . | . | . | . | . | . | . | . | 1 | 1 | 6 | 3 | . | . | . | . | . | . | . | . | . | . | . | . | . | |
| Pearl-bordered Fritillary | NI | . | . | . | . | . | 3 | 31 | 23 | 20 | 4 | 2 | . | . | . | . | . | . | 4 | . | . | . | . | . | . | . | |
| High Brown Fritillary | NI | . | . | . | . | . | . | . | . | . | . | . | 2 | 4 | 23 | 24 | 5 | 3 | . | . | 1 | . | . | . | . | . | |
| Dark Green Fritillary | NI | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | 2 | . | . | . | . | . | . | . | . | |
| Silver-washed Fritillary | NI | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 3 | . | . | . | . | . | . | . | |
| Speckled Wood | NI | . | . | . | 1 | 2 | 10 | 3 | 2 | 5 | 5 | 16 | 12 | 11 | 19 | 6 | 3 | . | . | 9 | 13 | 25 | 20 | 23 | 28 | 43 | |
| Wall Brown | NI | . | . | . | . | . | . | 4 | 5 | 9 | 2 | . | . | . | . | . | . | . | . | 6 | 4 | 2 | . | . | . | 2 | |
| Grayling | NI | . | . | . | . | . | . | . | . | . | . | . | . | 1 | 26 | 33 | 9 | 3 | 16 | . | 1 | . | . | . | . | . | |
| Gatekeeper / Hedge Brown | NI | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | |
| Meadow Brown | NI | . | . | . | . | . | . | . | . | . | . | . | 3 | 28 | 131 | 113 | 24 | 23 | . | 8 | 3 | . | . | . | . | . | |