Does minus 15 degrees F and hunting in 20 mph winds with a green ash selfbow count?  If so, then yeah.  How about right around zero with a hickory board bow, unbacked?  Then yeah, again. Or just above zero and shooting a bend in the handle hackberry selfbow that sat overnight in the vehicle for about a month reaching temps down to -10 degrees?  And then yeah once more. And with those absolute temps so low, the humidity starts to approach nothing at all, so I imagine they were all kinda on the dry side.  I kinda wonder if it is ever too dry for hickory, but other woods do reach a brittle point.
I don't think the cold is as serious as many people believe.  On the other hand, the older I get, the more willing I am to use it as an excuse to stay home!!!   
