
| 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 | . | . | . | . | . | . | . | 3 | 2 | 12 | 16 | 21 | 20 | 21 | 7 | 5 | . | . | . | . | . | . | . | |||
| Dingy Skipper | NI | . | . | . | . | . | 2 | 5 | 3 | 6 | 5 | 4 | 2 | . | . | . | . | . | . | . | . | . | . | . | |||
| Brimstone | NI | 3 | 2 | 2 | 2 | 1 | . | . | . | 1 | . | . | . | . | . | . | . | . | . | 1 | 2 | 2 | 1 | 3 | |||
| Large White | NI | . | . | . | 1 | . | . | . | . | . | 2 | . | . | . | 3 | 4 | . | 1 | . | . | . | . | . | . | |||
| Small White | NI | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | 1 | . | . | 1 | . | . | . | . | . | |||
| Green-veined White | NI | . | . | . | 3 | 2 | 3 | 3 | 1 | 4 | 1 | 1 | . | . | 3 | 7 | 4 | 2 | 3 | . | . | . | . | . | |||
| Orange Tip | NI | . | . | 2 | 6 | 7 | 4 | 1 | 2 | 3 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Green Hairstreak | NI | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Purple Hairstreak | NI | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 2 | 1 | . | 1 | 2 | . | . | . | . | |||
| Small Copper | NI | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | |||
| Northern Brown Argus | NI | . | . | . | . | . | . | . | . | . | 4 | 10 | 17 | 18 | 11 | 9 | 8 | 2 | . | . | . | . | . | . | |||
| Common Blue | NI | . | . | . | . | . | . | . | . | . | 11 | 10 | 10 | 17 | 13 | 5 | 2 | 3 | 3 | . | 4 | 7 | . | . | |||
| Holly Blue | NI | . | 2 | 4 | 4 | . | 2 | . | . | 1 | . | . | . | . | . | . | . | 1 | . | . | . | . | 1 | . | |||
| Duke of Burgundy Fritillary | NI | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||
| Red Admiral | NI | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | 2 | 3 | 51 | 5 | 2 | 3 | 1 | . | 1 | |||
| Painted Lady | NI | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | 1 | 2 | 2 | . | . | . | 1 | . | . | |||
| Small Tortoiseshell | NI | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | 2 | . | 1 | . | . | . | . | |||
| Peacock | NI | 7 | 8 | 9 | 11 | 4 | 3 | 1 | . | . | . | . | . | . | . | . | 1 | 12 | 9 | 8 | 7 | 6 | 1 | 3 | |||
| Comma | NI | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | |||
| Small Pearl-bordered Fritillary | NI | . | . | . | . | . | . | . | 2 | 5 | 7 | 9 | 6 | 5 | 1 | . | . | . | . | . | . | . | . | . | |||
| Pearl-bordered Fritillary | NI | . | . | . | . | 8 | 33 | 43 | 55 | 45 | 15 | 4 | 2 | . | . | . | . | . | . | . | . | . | . | . | |||
| High Brown Fritillary | NI | . | . | . | . | . | . | . | . | . | . | 2 | 14 | 29 | 41 | 41 | 30 | 22 | 4 | . | 1 | . | . | . | |||
| Dark Green Fritillary | NI | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | |||
| Wall Brown | NI | . | . | . | . | . | . | 1 | 1 | 2 | 1 | . | . | . | . | . | . | 4 | . | 2 | 3 | 3 | . | . | |||
| Grayling | NI | . | . | . | . | . | . | . | . | . | . | . | 11 | 9 | 13 | 11 | 16 | 10 | . | 1 | . | . | . | . | |||
| Meadow Brown | NI | . | . | . | . | . | . | . | . | . | . | 4 | 23 | 33 | 65 | 69 | 44 | 32 | 11 | 7 | 3 | 1 | . | . | |||