Just the general practice boils down to the fact that in the summer there is a decline in interest and activity to all markets, including crypto-currency. I'm getting rid of it, that it's unlikely that in the summer, if this year is closer to winter, it's comparable to last year. November December. Well, in general, of course, ordinary people do not know this ...
Yes, no one can know it, just invest whenever you like, try your luck
But as you say, closer to winter the market hotter.