Clouded Yellow
Colias croceus
Colias croceus, the clouded yellow, is a small butterfly of the family Pieridae, the yellows and whites. Source
Where it is now
In the last 8 weeks this insect was recorded 211 times across 10 areas (each area is a 5 degree square).
See the Clouded Yellow on the live map
Movement and weather
Over the weeks it was present in the past year, its centre in Europe ranged from 40°N in April to 54°N in September, about 1,500 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.
| Region | First arrival | Last arrival | Typical peak | Areas |
|---|---|---|---|---|
| Europe | 3 August 2026 | 3 August 2026 | 10 August 2026 | 2 |
Figures are effort corrected and come from automatic sound identification, which makes mistakes. How this is measured and how it compares with human observers.