Mist on my ADT security cameras

I had the ADT cameras replace around the house, they were old. They put in these new cameras, color, with night IR Vision. Today it has been misty and I looked over at the cameras and saw this video. Looks like snow but it isn’t

https://youtu.be/x-vNFaVtmTg

https://www.youtube.com/watch?v=MkaRh_Jjq3A