
| 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 | ||||||||||||||||||||||||||
| Small Skipper | . | . | . | . | . | . | . | . | . | . | 11 | 22 | 18 | 26 | 6 | 1 | . | . | . | . | ||||||
| Large Skipper | . | . | . | . | . | 1 | 4 | 25 | 37 | 27 | 25 | 6 | 4 | 1 | . | . | . | . | . | . | ||||||
| Grizzled Skipper | . | 6 | 10 | . | 5 | 4 | 2 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | ||||||
| Clouded Yellow | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | 1 | . | 1 | 2 | ||||||
| Brimstone | 2 | 1 | 3 | . | . | . | . | 2 | . | . | . | 2 | . | 11 | 7 | 2 | . | . | . | . | ||||||
| Large White | . | . | 3 | . | 1 | 1 | . | . | . | . | 3 | 6 | 3 | 5 | 5 | 2 | . | . | 1 | . | ||||||
| Small White | . | 2 | 2 | . | . | . | . | . | 1 | . | . | 2 | 2 | . | 6 | 10 | 18 | 10 | 4 | 1 | ||||||
| Green-veined White | . | 4 | 11 | . | 6 | . | . | . | . | 1 | 4 | 12 | 7 | 11 | . | 9 | 18 | 11 | 4 | . | ||||||
| Orange Tip | . | 4 | 4 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | ||||||
| Purple Hairstreak | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | ||||||
| Small Copper | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | 6 | 9 | 2 | 2 | 4 | 7 | ||||||
| Brown Argus | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 2 | . | . | . | 1 | ||||||
| Common Blue | . | . | . | . | . | 6 | 11 | 4 | 2 | 3 | . | . | . | 6 | 29 | 20 | 4 | 4 | . | . | ||||||
| Holly Blue | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | ||||||
| White Admiral | . | . | . | . | . | . | . | . | 3 | 6 | 12 | . | . | . | . | . | . | . | . | . | ||||||
| Red Admiral | 1 | . | . | . | . | . | . | 1 | 2 | 2 | 2 | 3 | . | 1 | 1 | 3 | 25 | 54 | 6 | 1 | ||||||
| Painted Lady | . | . | 1 | . | . | 1 | 2 | 1 | 4 | 1 | . | 1 | 1 | 9 | 13 | 10 | 3 | 7 | 7 | . | ||||||
| Small Tortoiseshell | . | . | . | . | . | . | . | 3 | 2 | 1 | 2 | . | 3 | 2 | 32 | 20 | 11 | 7 | 4 | . | ||||||
| Peacock | 6 | 6 | 9 | . | 2 | . | . | . | . | . | 1 | 4 | 24 | 56 | 38 | 8 | . | 1 | . | . | ||||||
| Comma | 3 | 1 | . | . | . | . | . | . | 2 | 1 | 11 | . | . | . | 1 | 6 | 5 | 49 | 34 | 5 | ||||||
| Silver-washed Fritillary | . | . | . | . | . | . | . | . | . | 1 | 10 | 5 | 3 | 8 | 5 | 1 | . | . | . | . | ||||||
| Marsh Fritillary | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | ||||||
| Speckled Wood | 2 | 1 | 5 | . | 1 | 3 | 11 | 4 | 10 | 3 | 3 | 7 | 4 | 5 | 13 | 23 | 31 | 24 | 12 | 10 | ||||||
| Marbled White | . | . | . | . | . | . | . | . | 6 | 9 | 7 | 3 | . | . | . | . | . | . | . | . | ||||||
| Gatekeeper/Hedge Brown | . | . | . | . | . | . | . | . | . | . | 2 | 45 | 83 | 143 | 40 | 10 | . | . | . | . | ||||||
| Meadow Brown | . | . | . | . | . | . | . | 16 | 54 | 143 | 137 | 94 | 108 | 62 | 21 | 14 | 1 | . | . | . | ||||||
| Ringlet | . | . | . | . | . | . | . | 1 | 59 | 169 | 170 | 159 | 23 | 9 | 1 | 1 | . | . | . | . | ||||||