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.

17,387 vs. 10,137 + 71.5%

Recording activity

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

First sightings

Earliest dates on which adult butterflies were reported.

Species 2019 2020
Adonis Blue 08 May 27 Apr
Brimstone 14 Feb 19 Jan
Brown Argus 20 Apr 19 Apr
Clouded Yellow 24 Feb 19 Apr
Comma 14 Feb 19 Jan
Common Blue 29 Apr 26 Apr
Dark Green Fritillary 14 Jun 25 May
Dingy Skipper 19 Apr 14 Apr
Duke of Burgundy 04 May 02 May
Green Hairstreak 15 Apr 08 Apr
Green-veined White 24 Mar 16 Mar
Grizzled Skipper 19 Apr 08 Apr
Holly Blue 12 Feb 25 Mar
Large Skipper 26 May 19 May
Large Tortoiseshell 24 Feb 03 Mar
Large White 24 Mar 24 Mar
Lulworth Skipper 11 May 07 May
Marbled White 05 Jun 19 May
Marsh Fritillary 06 May 26 Apr
Meadow Brown 30 May 17 May
Orange Tip 24 Mar 26 Mar
Painted Lady 09 Jan 03 Apr
Peacock 01 Jan 05 Jan
Red Admiral 01 Jan 02 Jan
Silver-studded Blue 01 Jun 25 May
Small Blue 04 May 25 Apr
Small Copper 26 Mar 24 Mar
Small Heath 19 Apr 22 Apr
Small Pearl-bordered Fritillary 09 Jun 27 May
Small Skipper 01 Jun 27 May
Small Tortoiseshell 13 Jan 19 Jan
Small White 24 Mar 01 Mar
Speckled Wood 24 Mar 21 Mar
Wall Brown 13 Apr 08 Apr
Brown Hairstreak 20 Jul -
Chalkhill Blue 14 Jul -
Essex Skipper 14 Jun -
Gatekeeper 28 Jun -
Glanville Fritillary 01 Jun -
Grayling 27 Jun -
Long-tailed Blue 03 Aug -
Purple Emperor 10 Jul -
Purple Hairstreak 20 Jun -
Ringlet 18 Jun -
Silver-spotted Skipper 28 Jul -
Silver-washed Fritillary 26 Jun -
Swallowtail 05 Aug -
White Admiral 26 Jun -
White-letter Hairstreak 24 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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