Most midair collision accidents occur during which conditions?

Midair collision accidents are most likely to occur during clear days because visibility is usually optimal, allowing pilots to see and avoid other aircraft. On clear days, there tends to be higher overall air traffic as more pilots are willing to fly due to favorable weather conditions. Additionally, pilots may become complacent in optimal flying weather, potentially leading to lapses in attention or situational awareness, which can increase the risk of collisions.

In contrast, during poor weather conditions like rain, fog, or night flying, flight activity typically decreases as pilots might choose to avoid flying due to low visibility or adverse weather phenomena. These factors naturally lower the chances of midair collisions when air traffic is reduced.