Pale Clouded Yellow

Colias hyale

Colias hyale, the pale clouded yellow, is a butterfly of the family Pieridae, which is found in most of Europe and large parts of the Palearctic. It is a rare migrant to the British Isles and Scandinavia. The adult wingspan is 52–62 millimetres (2.0–2.4 in). Source

Where it is now

In the last 8 weeks this insect was recorded 15 times across 2 areas (each area is a 5 degree square).

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Movement and weather

Over the weeks it was present in the past year, its centre in Europe ranged from 48°N in May to 56°N in August, about 1,000 km apart.

Arrival dates

The week it was first heard regularly in each region, after at least six weeks away. Dates differ from south to north, so a region has a range.

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Figures are effort corrected and come from automatic sound identification, which makes mistakes. How this is measured and how it compares with human observers.