Turbulence Forecast
Pick a route — see the smoothness rating, calmest months, and the atmospheric reason behind it.
Generally smooth
New York → London
3,442 miles · Turbulence index 3.8 / 10
Smoothest months: late summer (August–September)
Bumpiest months: winter (December–February)
Why: the North Atlantic jet stream peaks in winter, often producing 150+ knot tailwinds eastbound and headwinds westbound. Clear-air turbulence is most common at the boundary between the jet stream and slower surrounding air, with peak frequency in January and February.
Index based on great-circle distance, jet-stream proximity, equatorial convergence crossings, and historical PIREP frequency.