
| 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 | ||||||||||||||||||||||||||
| Large Skipper | . | . | . | . | . | . | . | 2 | 3 | 1 | 2 | 1 | . | 1 | . | . | . | . | . | . | . | . | ||||
| Dingy Skipper | . | . | . | . | 10 | 15 | 12 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | ||||
| Grizzled Skipper | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | ||||
| Brimstone | 5 | 4 | 5 | 6 | . | 4 | . | . | . | . | . | . | . | 2 | 3 | 7 | 6 | 5 | 7 | 5 | 1 | . | ||||
| Large White | . | . | . | 3 | . | . | 4 | . | 1 | . | . | . | 5 | 5 | 3 | 4 | 2 | 4 | 8 | . | . | . | ||||
| Small White | . | . | . | . | 2 | . | . | . | . | . | . | . | . | . | . | 10 | 4 | 2 | 2 | . | . | . | ||||
| Green-veined White | . | . | 8 | 19 | 9 | 28 | 10 | 1 | . | . | 11 | 30 | 64 | 44 | 70 | 67 | 47 | 20 | 7 | 9 | 4 | . | ||||
| Orange Tip | . | 11 | 20 | 19 | 12 | 17 | 5 | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | ||||
| Green Hairstreak | . | . | 4 | 5 | 8 | 1 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | ||||
| Purple Hairstreak | . | . | . | . | . | . | . | . | . | . | . | 4 | . | . | 2 | . | . | . | . | . | . | . | ||||
| Small Copper | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | ||||
| Northern Brown Argus | . | . | . | . | . | . | . | 4 | 6 | 21 | 4 | 23 | 17 | 13 | 2 | 1 | . | 1 | . | . | . | . | ||||
| Common Blue | . | . | . | . | . | . | . | 1 | . | 4 | . | 1 | . | . | . | . | . | 1 | 1 | . | . | . | ||||
| Red Admiral | . | . | . | . | . | . | . | . | . | . | 4 | . | . | 4 | 2 | 2 | 3 | 1 | 1 | . | 4 | 9 | ||||
| Small Tortoiseshell | 11 | 4 | 12 | 14 | 5 | 6 | 2 | . | . | . | . | 1 | 12 | 13 | 6 | 4 | . | 1 | . | . | . | . | ||||
| Peacock | 19 | 9 | 13 | 20 | 5 | 5 | 3 | . | . | . | . | . | . | 1 | 5 | 111 | 82 | 56 | 33 | 11 | . | . | ||||
| Comma | 3 | . | . | 1 | . | . | . | . | . | . | 1 | 4 | 7 | 5 | . | 3 | 1 | 2 | . | . | . | 2 | ||||
| Small Pearl-bordered Fritillary | . | . | . | . | . | . | . | 10 | 12 | 8 | 3 | 1 | . | . | . | . | . | . | . | . | . | . | ||||
| Pearl-bordered Fritillary | . | . | . | . | 8 | 8 | 15 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | ||||
| High Brown Fritillary | . | . | . | . | . | . | . | . | . | 1 | 15 | 17 | 11 | 17 | 5 | 5 | 6 | 1 | . | . | . | . | ||||
| Speckled Wood | . | . | . | . | 2 | . | . | . | 6 | 6 | 11 | 7 | 7 | 7 | 4 | 12 | . | 5 | 5 | 8 | 23 | 18 | ||||
| Wall Brown | . | . | . | . | 1 | . | . | . | . | . | . | . | . | 1 | . | 1 | 6 | 7 | 1 | 3 | . | . | ||||
| Meadow Brown | . | . | . | . | . | . | . | 1 | 9 | 54 | 72 | 127 | 119 | 98 | 70 | 45 | 8 | 2 | . | . | . | . | ||||
| Small Heath | . | . | . | . | 15 | 29 | 55 | 7 | 5 | 5 | 2 | 4 | . | . | . | . | . | . | . | . | . | . | ||||
| Holly Blue (Northern) | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | ||||