Rates a ride on two wheels from 6am to 9pm. GoDay finds the best 2 hours of each day and cares most about grip and being seen: rain, wet roads, gusts and light.
Also on the page, but not in the score: UV, wind direction.
Riding in the dark holds the score at 4, and at dusk at 5. A thunderstorm holds it at 3.
Dry roads, good daylight, gusts under 25 km/h (16 mph) and 18 to 28°C (64 to 82°F). Below 10°C (50°F) GoDay rates it cold.
Yes. It looks at the rain in the last 6 hours, because roads stay slippery after the rain stops.
A steady wind is predictable; a sudden gust can push a bike across the lane. Gusts past 40 km/h (25 mph) count heavily against the ride.