
| 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 | 2 | 8 | 11 | 23 | 29 | 11 | 11 | 4 | . | . | . | . | |||||||
| Essex Skipper | NI | . | . | . | . | . | . | . | . | . | 1 | . | . | . | 1 | . | . | . | . | . | |||||||
| Large Skipper | NI | . | . | . | . | 5 | 15 | 14 | 1 | 3 | 1 | . | . | . | . | . | . | . | . | . | |||||||
| Grizzled Skipper | NI | . | . | 3.5 | 1 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||||||
| Brimstone | NI | 7 | . | . | . | . | 1 | . | . | . | . | . | 5 | . | 4 | 5 | 1 | 3 | 4 | 5 | |||||||
| Large White | NI | . | 1 | 2.5 | 2 | 1 | 1 | 1 | . | 1 | 2 | 3 | 7 | 12 | 6 | . | 1 | 2 | . | . | |||||||
| Small White | NI | 1 | . | 2 | . | . | . | . | . | . | 1 | 1 | 4 | 8 | 3 | 3 | . | 4 | . | . | |||||||
| Green-veined White | NI | . | . | 1.5 | 1 | . | . | . | . | 2 | 3 | 3 | 2 | 14 | 4 | 3 | 5 | 6 | 2 | . | |||||||
| Orange Tip | NI | 4 | . | 1.5 | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | |||||||
| Brown Hairstreak | NI | . | . | . | . | . | . | . | . | . | . | . | . | . | 3 | . | . | . | . | . | |||||||
| Small Copper | NI | . | . | . | . | . | . | . | . | . | . | . | . | . | 2 | . | . | . | . | . | |||||||
| Common Blue | NI | . | . | . | 2 | 1 | . | 2 | . | . | . | . | . | . | 1 | . | . | . | . | . | |||||||
| Holly Blue | NI | 1 | . | 0.5 | . | . | . | . | . | . | . | . | . | 1 | 1 | . | . | . | . | . | |||||||
| White Admiral | NI | . | . | . | . | . | . | 1 | . | . | 1 | . | . | . | . | . | . | . | . | . | |||||||
| Red Admiral | NI | . | . | . | . | . | . | . | . | . | . | . | . | . | 2 | 3 | 3 | 2 | 1 | 2 | |||||||
| Painted Lady | NI | . | . | . | . | . | . | 1 | . | . | . | . | . | . | . | . | . | . | . | . | |||||||
| Small Tortoiseshell | NI | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | . | 3 | 2 | 1 | |||||||
| Peacock | NI | 18 | 1 | 1 | . | . | . | . | . | . | . | . | 12 | 5 | 30 | 9 | 3 | 6 | 1 | . | |||||||
| Comma | NI | . | . | . | . | . | . | 1 | . | 1 | . | . | . | . | 1 | 1 | 1 | 3 | 3 | 2 | |||||||
| Silver-washed Fritillary | NI | . | . | . | . | . | . | 7 | 1 | 10 | 2 | 7 | 6 | 8 | 7 | 2 | 1 | . | . | . | |||||||
| Speckled Wood | NI | 1 | . | 3.5 | 6 | 10 | 1 | 6 | . | 2 | . | 1 | 5 | 8 | 13 | 15 | 66 | 65 | 20 | 11 | |||||||
| Marbled White | NI | . | . | . | . | . | 1 | 2 | 2 | 10 | 9 | 7 | 2 | 1 | . | . | . | . | . | . | |||||||
| Gatekeeper / Hedge Brown | NI | . | . | . | . | . | . | . | . | 4 | 7 | 58 | 78 | 83 | 105 | 29 | 7 | . | . | . | |||||||
| Meadow Brown | NI | . | . | . | . | . | 42 | 126 | 113 | 88 | 55 | 71 | 89 | 60 | 40 | 17 | 19 | 1 | . | . | |||||||
| Ringlet | NI | . | . | . | . | . | 10 | 192 | 206 | 203 | 127 | 116 | 28 | 17 | 1 | . | . | . | . | . | |||||||