
| 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 | Ind | ||||||||||||||||||||||||||
| Small Skipper | NI | . | . | . | . | . | . | 2 | 8 | 16 | 16 | 20 | 13 | 3 | . | . | . | . | . | . | |||||||
| Essex Skipper | NI | . | . | . | . | . | . | . | 3 | 2 | 6 | 3 | 4 | . | . | . | . | . | . | . | |||||||
| Large Skipper | NI | . | . | . | . | . | 3 | 2 | 7 | 5 | 2 | 4 | 1 | 1 | . | . | . | . | . | . | |||||||
| Clouded Yellow | 9 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | 1 | . | . | |||||||
| Brimstone | NI | 7 | 27 | 17 | 15 | 9 | . | . | . | 4 | 5 | 18 | 13 | 16 | 1 | 8 | 2 | 1 | . | . | |||||||
| Large White | NI | . | 1 | . | 2 | . | . | 1 | 2 | 10 | 22 | 18 | 13 | 11 | 2 | 3 | 1 | 2 | 2 | . | |||||||
| Small White | NI | . | 1 | . | . | . | . | 2 | . | 2 | 2 | 4 | 13 | 11 | . | 6 | 1 | 2 | . | . | |||||||
| Green-veined White | NI | . | 19 | 3 | 6 | 2 | 1 | . | 9 | 11 | 32 | 59 | 61 | 64 | 14 | 16 | 10 | 2 | 1 | 1 | |||||||
| Orange Tip | . | . | 3 | 2 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||||||
| Green Hairstreak | NI | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||||||
| Purple Hairstreak | NI | . | . | . | . | . | . | 5 | 2 | 4 | 2 | 9 | 1 | 2 | . | . | . | . | . | . | |||||||
| Small Copper | NI | . | 1 | . | . | . | . | . | . | 1 | . | . | 2 | 1 | . | . | . | 1 | . | 2 | |||||||
| Common Blue | NI | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | |||||||
| Holly Blue | NI | . | . | 4 | . | . | 2 | . | . | . | . | 4 | 7 | . | . | . | . | . | . | . | |||||||
| Red Admiral | NI | . | . | . | . | 2 | 3 | 2 | 1 | 2 | 1 | . | 4 | 1 | . | . | . | . | . | 2 | |||||||
| Small Tortoiseshell | 55 | 10 | 1 | . | 1 | . | 2 | 7 | 11 | 7 | 7 | 6 | 1 | 1 | 1 | 1 | 2 | . | . | 2 | |||||||
| Peacock | NI | 9 | 3 | 2 | 2 | 1 | . | . | . | . | 1 | 3 | 2 | . | . | . | . | . | . | . | |||||||
| Comma | 39 | 2 | . | 1 | . | . | . | 4 | 4 | 3 | 1 | . | 2 | 2 | . | 1 | 3 | . | 1 | . | |||||||
| Silver-washed Fritillary | NI | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | |||||||
| Speckled Wood | NI | . | 2 | . | 2 | 1 | 2 | 2 | 1 | 1 | 1 | 3 | 1 | 1 | 5 | 10 | 10 | . | 1 | 4 | |||||||
| Marbled White | 52 | . | . | . | . | . | . | 3 | 18 | 7 | 6 | 10 | 1 | . | . | . | . | . | . | . | |||||||
| Gatekeeper / Hedge Brown | NI | . | . | . | . | . | . | . | . | 1 | 34 | 72 | 148 | 108 | 6 | 4 | . | . | . | . | |||||||
| Meadow Brown | NI | . | . | . | . | . | 6 | 45 | 94 | 89 | 58 | 95 | 54 | 46 | 10 | 5 | 1 | . | . | . | |||||||
| Small Heath | NI | . | . | . | . | . | . | . | . | . | . | . | . | 1 | . | . | . | . | . | . | |||||||
| Ringlet | NI | . | . | . | . | . | . | 1 | 13 | 15 | 8 | 7 | . | 1 | . | . | . | . | . | . | |||||||