
| 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 | . | . | . | . | . | . | . | 1 | 1 | 8 | 48 | 89 | 66 | 29 | 8 | 2 | . | . | . | . | . | |||||
| Essex Skipper | . | . | . | . | . | . | . | . | 4 | . | 8 | 2 | . | . | . | . | . | . | . | . | . | |||||
| Large Skipper | . | . | . | . | . | . | 8 | 6 | 14 | 3 | 8 | 10 | 14 | 9 | 6 | . | . | . | . | . | . | |||||
| Dingy Skipper | . | . | . | . | 4 | 11 | 6 | 2 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | |||||
| Clouded Yellow | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | |||||
| Brimstone | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||||
| Large White | . | . | . | 5 | 13 | 7 | 2 | 5 | 5 | 1 | . | 13 | 76 | 132 | 123 | 43 | 35 | 13 | 17 | 15 | 24 | |||||
| Small White | 2 | . | . | 9 | 8 | 1 | 1 | 3 | . | . | 1 | . | 4 | 13 | 12 | . | . | 1 | 5 | 4 | 1 | |||||
| Green-veined White | . | 1 | . | . | 4 | 2 | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | |||||
| Orange Tip | . | . | 1 | 2 | 1 | 2 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||||
| Green Hairstreak | . | . | 1 | . | 6 | 6 | 1 | 1 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | |||||
| Small Copper | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | |||||
| Small Blue | . | . | . | . | . | . | 3 | 1 | 2 | . | . | . | . | . | . | . | . | . | . | . | . | |||||
| Brown Argus | . | . | . | . | . | . | 2 | 3 | 4 | 3 | . | . | . | . | . | 1 | 7 | 1 | 2 | 3 | . | |||||
| Common Blue | . | . | . | . | . | 2 | 11 | 18 | 18 | 5 | 11 | 1 | 1 | 1 | 17 | 13 | 41 | 4 | 7 | 26 | 8 | |||||
| Adonis Blue | . | . | . | . | 1 | 4 | 54 | 45 | 29 | 4 | 6 | . | . | . | 3 | 1 | 27 | 29 | 42 | 36 | 4 | |||||
| Red Admiral | . | . | . | . | . | . | . | . | . | . | . | 2 | 3 | 2 | . | 1 | 1 | . | 1 | 2 | 2 | |||||
| Painted Lady | . | . | . | . | . | . | 1 | . | . | . | 2 | . | 2 | . | . | . | . | 1 | 2 | 1 | . | |||||
| Small Tortoiseshell | 13 | 5 | 3 | 2 | . | . | . | . | 1 | . | 6 | 9 | 2 | . | 1 | . | . | 5 | 7 | 5 | 1 | |||||
| Peacock | 13 | 3 | 3 | 1 | . | . | . | . | . | . | . | . | . | 3 | 3 | . | 2 | 1 | . | 2 | 1 | |||||
| Comma | 2 | 1 | 1 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | |||||
| Silver-washed Fritillary | . | . | . | . | . | . | . | . | . | . | . | . | 1 | 1 | 1 | . | . | . | . | . | . | |||||
| Speckled Wood | . | 16 | 10 | 11 | 4 | 21 | 20 | 10 | 7 | 4 | 2 | 3 | 7 | 13 | 16 | 28 | 22 | 25 | 17 | 8 | 4 | |||||
| Wall Brown | . | . | . | . | 7 | 18 | . | . | . | . | . | . | . | . | 2 | 13 | 2 | . | . | . | . | |||||
| Marbled White | . | . | . | . | . | . | . | . | . | . | 51 | 168 | 91 | 38 | 23 | 5 | . | . | . | . | . | |||||
| Gatekeeper/Hedge Brown | . | . | . | . | . | . | . | . | . | . | . | 10 | 52 | 39 | 62 | 16 | 2 | . | . | . | . | |||||
| Meadow Brown | . | . | . | . | . | . | . | . | 5 | 11 | 55 | 24 | 44 | 22 | 22 | 19 | 5 | . | 1 | . | . | |||||
| Small Heath | . | . | . | . | 3 | 11 | 15 | 27 | 22 | 11 | 9 | 2 | 1 | . | 1 | 3 | 14 | 3 | 3 | 4 | . | |||||
| Ringlet | . | . | . | . | . | . | . | . | . | . | 27 | 126 | 52 | 21 | 12 | 1 | . | . | . | . | . | |||||