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.

49,452 vs. 32,338 + 52.9%

Recording activity

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

First sightings

Earliest dates on which adult butterflies were reported.

Species 2018 2019
Adonis Blue 14 May 08 May
Brimstone 28 Jan 14 Feb
Brown Argus 07 May 20 Apr
Brown Hairstreak 15 Jul -
Chalkhill Blue 02 Jul -
Clouded Yellow 18 Apr 24 Feb
Comma 15 Mar 14 Feb
Common Blue 30 Apr 29 Apr
Dark Green Fritillary 02 Jun 14 Jun
Dingy Skipper 30 Apr 19 Apr
Duke of Burgundy 07 May 04 May
Essex Skipper 22 Jun 14 Jun
Gatekeeper 20 Jun 28 Jun
Grayling 23 Jun 27 Jun
Green Hairstreak 25 Apr 15 Apr
Green-veined White 14 Apr 24 Mar
Grizzled Skipper 20 Apr 19 Apr
Holly Blue 05 Apr 12 Feb
Large Skipper 26 May 26 May
Large Tortoiseshell 20 Apr 24 Feb
Large White 17 Apr 24 Mar
Lulworth Skipper 18 May 11 May
Marbled White 06 Jun 05 Jun
Marsh Fritillary 14 May 06 May
Meadow Brown 27 May 30 May
Orange Tip 14 Apr 24 Mar
Painted Lady 22 Apr 09 Jan
Peacock 12 Jan 01 Jan
Purple Emperor 26 Jun 10 Jul
Purple Hairstreak 17 Jun 20 Jun
Queen of Spain Fritillary 26 Jul -
Red Admiral 05 Jan 01 Jan
Ringlet 10 Jun 18 Jun
Silver-spotted Skipper 02 Aug -
Silver-studded Blue 08 Jun 01 Jun
Silver-washed Fritillary 21 Jun 26 Jun
Small Blue 13 May 04 May
Small Copper 18 Apr 26 Mar
Small Heath 07 May 19 Apr
Small Pearl-bordered Fritillary 11 Jun 09 Jun
Small Skipper 28 May 01 Jun
Small Tortoiseshell 16 Feb 13 Jan
Small White 26 Mar 24 Mar
Speckled Wood 16 Apr 24 Mar
Wall Brown 04 May 13 Apr
White Admiral 15 Jun 26 Jun
White-letter Hairstreak 18 Jun 24 Jun
Wood White 09 Jul -
Glanville Fritillary - 01 Jun

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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