15 mph winds ground most delivery drones, causing unpredictable service gaps

Most commercial delivery drones cannot safely operate in winds exceeding 15-20 mph. Wind at this speed reduces effective payload capacity by up to 40% and makes precise package lowering dangerous. In much of the US, average wind speeds exceed 10 mph on a typical day, and gusts above 15 mph are common -- the National Weather Service reports that cities like Chicago, Dallas, Denver, and Kansas City experience winds above 15 mph on 30-40% of days annually. This means drone delivery services face unpredictable, weather-driven service outages that make them unreliable as a primary delivery option. A customer who orders medication via drone delivery on a windy Tuesday gets told 'service unavailable' with no alternative -- so they stop trusting drone delivery and revert to ground shipping. The business impact is that operators cannot guarantee SLAs, which prevents them from winning contracts with enterprises (pharmacies, hospitals, retailers) that need guaranteed delivery windows. The structural reason is that small multirotor drones have high drag-to-weight ratios and limited thrust margins, making them inherently vulnerable to atmospheric disturbance. Fixed-wing designs like Zipline's handle wind better but cannot hover for package lowering in tight residential areas.