cold temps for me is 0 to 20's especially if any winds which makes it below zero wind chills,, I'm not one to buy the latest and greatest cold weather tech clothing so whats always worked for me in frigid temps is the this layering T shirt under long john type shirt under a thin golfers type windbreaker under heavy wool irish type sweater under insulated wool jacket or bigger size asbell pull over it depends on the wind all the layers need to fit loose or you can't move,,,, bottoms are those thin moisture wicking long johns with medium longs over them then fleece lined jeans with insulated cabelas type cold weather bottoms ( time your pee's correctly you need to get out of 5 layers trust me its not easy) ..... I'll omit base layers or other layers if its not windy out--- the wind is what I can't handle when its frigid out... I'm pretty toasty and Ive worn that setup in -14 wind chills and sat in tree from dark to dark. foot wear I wear wool lined baffins or another set of baffins rated for 100 below zero made for ice fisherman in Canada they suck to hike far in but your feet will never feel cold even with thin socks and standing in two feet of snow all day, if I'm dragging deer layers come right off.. for hands I don't like gloves so I use a tube type hand warmer and I'll use hand warmer packs in that.. full face mask or neck gator, thick wool knit type hat that covers ears.
I shoot my lightest and shortest bows,, I like a draw check too cause you can short draw real easy with heavy clothes on.
30 degree temps to me isn't cold its all about that wind though the wind is what will beat you every time.
on a side note I admire you guys that hunt in 70 to 100 degree temps with skeeters and ants and snakes everywhere, bugs flying in your eyes everytime you go to shoot , I'm sneaking down trail trying to be quiet and baby alligators thrashing off almost making me have a coronary, I remember when my thermacell died in south Carolina I actually started running from the skeeters that swarmed me!