A rare weather event known as thundersnow hit Montreal, Canada on February 29, 2016 during a heavy storm.
Thundersnow events are very rare as less than 1 percent of all snowstorms are associated with thunder.
Snowlightnings require just the right mix of atmospheric instability and upward motion of warm air that make both snowstorms and thunder unique.
Thunder and lightning existing in the storm are usually a symptom of something else. That’s usually a harbinger of somebody getting a significant snowfall later on.