With them being jumpers and with all of the rain you have had, it makes me wonder if they are white springtails. They are attracted to damp areas and invade in the thousands. The good news is, is if that is indeed what you have , they will disappear as soon as you get drier conditions.
Without a photo, I am not sure that I can be of much more help. I hope that someone else will pop in soon with other possibilities...
