This year vs. last year

How do butterfly sightings reported to the Dorset website* compare?

Total records

Butterflies reported so far this year vs. this time last year.

0 vs. 13 - 100.0%

Recording activity

Number of species records by date seen (scroll right for key).

First sightings

Earliest dates on which adult butterflies were reported.

Species 2020 2021
Adonis Blue 27 Apr -
Brimstone 19 Jan -
Brown Argus 19 Apr -
Brown Hairstreak 12 Jul -
Chalkhill Blue 06 Jul -
Clouded Yellow 19 Apr -
Comma 19 Jan -
Common Blue 26 Apr -
Dark Green Fritillary 25 May -
Dingy Skipper 14 Apr -
Duke of Burgundy 02 May -
Essex Skipper 14 Jun -
Gatekeeper 09 Jun -
Grayling 14 Jun -
Green Hairstreak 08 Apr -
Green-veined White 16 Mar -
Grizzled Skipper 08 Apr -
Holly Blue 25 Mar -
Large Skipper 19 May -
Large Tortoiseshell 03 Mar -
Large White 24 Mar -
Long-tailed Blue 10 Aug -
Lulworth Skipper 07 May -
Marbled White 19 May -
Marsh Fritillary 26 Apr -
Meadow Brown 17 May -
Orange Tip 26 Mar -
Painted Lady 03 Apr -
Peacock 05 Jan -
Purple Emperor 23 Jun -
Purple Hairstreak 07 Jun -
Red Admiral 02 Jan -
Ringlet 05 Jun -
Silver-spotted Skipper 03 Aug -
Silver-studded Blue 25 May -
Silver-washed Fritillary 07 Jun -
Small Blue 25 Apr -
Small Copper 24 Mar -
Small Heath 22 Apr -
Small Pearl-bordered Fritillary 27 May -
Small Skipper 27 May -
Small Tortoiseshell 19 Jan -
Small White 01 Mar -
Speckled Wood 21 Mar -
Swallowtail 09 Aug -
Wall Brown 08 Apr -
White Admiral 04 Jun -
White-letter Hairstreak 15 Jun -
Wood White 19 Apr -

Species count

Totals for last full year vs. butterflies reported so far this year.

*Please note: The charts shown on this page are drawn only from casual sightings submitted to this website. They are therefore not statistically significant, but do serve as an indication of what’s going on in the Dorset butterfly world. The records from this website will be added to a lot more data collected throughout the year, and used to compile the five-yearly Butterfly Atlases for Dorset and the UK. These are vitally important because they show the location of species and, over time, measure distribution changes and the possible effects of climate change. This gives us the information we need to help various species in appropriate ways.

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