
| 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 | . | . | . | . | . | 1 | . | 6 | 25 | 47 | 66 | 10 | . | . | . | . | . | . | . | . | . | |||||
| Large Skipper | . | . | . | . | . | 1 | 5 | 4 | 2 | 19 | 5 | 2 | . | . | . | . | . | . | . | . | . | |||||
| Dingy Skipper | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||||
| Brimstone | 1 | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||||
| Large White | . | . | . | 1 | . | 2 | . | 3 | 3 | 1 | 4 | 12 | . | 6 | 2 | 3 | 3 | 1 | 2 | . | . | |||||
| Small White | . | . | 2 | 2 | 4 | 4 | . | . | . | 1 | 2 | 3 | 1 | . | 2 | . | . | 2 | 1 | . | . | |||||
| Green-veined White | . | . | . | 2 | . | . | . | . | . | 1 | . | 2 | . | . | . | . | . | . | . | . | . | |||||
| Orange Tip | 6 | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||||
| Purple Hairstreak | . | . | . | . | . | . | . | . | . | . | 2 | 7 | . | 2 | . | 3 | . | 1 | . | . | . | |||||
| Small Copper | . | . | . | . | . | . | . | . | . | . | 1 | . | 1 | 2 | . | . | 1 | 1 | . | 2 | 3 | |||||
| Brown Argus | . | 5 | . | . | . | . | . | . | . | . | . | . | . | . | 3 | 2 | . | . | . | . | . | |||||
| Common Blue | . | . | . | . | . | 18 | 1 | . | . | . | . | 6 | 13 | 47 | 35 | 38 | 19 | 6 | 3 | 2 | 1 | |||||
| Holly Blue | 3 | 1 | 1 | 1 | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | |||||
| Red Admiral | . | . | . | . | . | . | . | 1 | . | 1 | 3 | 1 | . | . | . | . | . | . | . | . | . | |||||
| Painted Lady | . | . | . | . | . | . | . | 1 | . | . | 1 | 1 | 3 | . | . | . | . | . | . | . | . | |||||
| Small Tortoiseshell | . | 1 | . | . | 1 | . | . | . | 2 | . | . | . | . | 1 | . | . | . | . | . | . | . | |||||
| Comma | 1 | . | . | . | . | . | . | 2 | . | 1 | . | 1 | . | . | 1 | . | . | 1 | . | . | . | |||||
| Heath Fritillary | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 6 | . | . | . | |||||
| Speckled Wood | 8 | 1 | . | 2 | 2 | . | 10 | 4 | 2 | . | 3 | 11 | 2 | 9 | 7 | 12 | 8 | . | 6 | 5 | 5 | |||||
| Marbled White | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | |||||
| Gatekeeper/Hedge Brown | . | . | . | . | . | . | . | . | . | 11 | 60 | 63 | 28 | 7 | 2 | 2 | . | . | . | . | . | |||||
| Meadow Brown | . | . | . | . | . | . | 10 | 49 | 68 | 86 | 120 | 83 | 64 | 51 | 32 | 33 | 17 | 5 | . | . | . | |||||
| Small Heath | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | |||||
| Ringlet | . | . | . | . | . | . | . | 14 | 26 | 17 | 9 | 6 | . | . | . | . | . | . | . | . | . | |||||