July Highflyer

Hydriomena furcata

Hydriomena furcata, the July highflyer, is a moth of the family Geometridae. The species was first described by Carl Peter Thunberg in 1784. It is found in the Holarctic ecozone. Source

Where it is now

In the last 8 weeks this insect was recorded 64 times across 5 areas (each area is a 5 degree square).

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Movement and weather

Each season it is first heard regularly where daytime highs are around 20°C (typically 15 to 25°C, from 7 areas). That range is wide, so temperature alone does not explain when it turns up.

Over the weeks it was present in the past year, its centre in Europe ranged from 53°N in July to 65°N in August, about 1,300 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.