
| 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/Essex Skipper | . | . | . | . | . | . | 6 | 9 | 22 | 9 | . | . | . | . | . | . | . | . | ||||||||
| Large Skipper | . | . | . | . | 2 | . | . | 6 | 2 | . | . | . | . | . | . | . | . | . | ||||||||
| Dingy Skipper | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | ||||||||
| Clouded Yellow | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | 3 | . | . | ||||||||
| Brimstone | 12 | 32 | 10 | 8 | . | . | 1 | 3 | 17 | 19 | 10 | 17 | . | 4 | 2 | . | . | . | ||||||||
| Large White | . | . | . | . | . | . | . | 1 | 1 | 4 | 5 | 1 | . | . | 1 | . | . | . | ||||||||
| Small White | . | . | . | . | . | . | . | . | 1 | 5 | 11 | 5 | 1 | . | 2 | 1 | . | . | ||||||||
| Green-veined White | . | . | . | . | . | . | . | 1 | . | . | . | . | . | 3 | 4 | . | . | . | ||||||||
| Green Hairstreak | . | 1 | . | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | ||||||||
| Small Copper | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | ||||||||
| Common Blue | . | . | 1 | 1 | 1 | . | 1 | . | 1 | 9 | 6 | 7 | . | . | 3 | 2 | . | . | ||||||||
| Holly Blue | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | ||||||||
| White Admiral | . | . | . | . | 3 | 7 | 9 | 7 | 5 | 4 | . | . | . | . | . | . | . | . | ||||||||
| Red Admiral | . | . | . | 1 | . | 1 | . | . | 1 | 2 | 1 | . | . | . | . | 1 | . | . | ||||||||
| Painted Lady | . | . | . | . | 1 | . | . | 1 | 1 | 2 | 2 | 1 | 1 | 2 | . | . | . | . | ||||||||
| Peacock | 3 | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | ||||||||
| Comma | 2 | . | . | . | . | 2 | . | . | 1 | . | . | . | . | 1 | 4 | 2 | . | . | ||||||||
| Silver-washed Fritillary | . | . | . | . | 1 | 8 | 17 | 28 | 62 | 84 | 87 | 38 | 1 | . | . | . | . | . | ||||||||
| Speckled Wood | 1 | 9 | 7 | 8 | 9 | 4 | 2 | . | 11 | 13 | 19 | 13 | 6 | 13 | 5 | 2 | 3 | 1 | ||||||||
| Marbled White | . | . | . | . | 1 | 9 | 34 | 37 | 25 | 9 | 3 | 1 | . | . | . | . | . | . | ||||||||
| Gatekeeper/Hedge Brown | . | . | . | . | . | . | . | 20 | 73 | 85 | 54 | 30 | 1 | . | . | . | . | . | ||||||||
| Meadow Brown | . | . | . | . | 12 | 54 | 76 | 111 | 104 | 117 | 95 | 54 | 6 | 9 | 3 | . | . | . | ||||||||
| Ringlet | . | . | . | . | 1 | . | . | 9 | 6 | . | . | . | . | . | . | . | . | . | ||||||||