Hey! I grew up near Verona and I remember winter in the 'Burgh. No way, no how would I attempt a garage sale in February in Pittburgh. Youns would have to be nuts!
Check some of you local churches to see if they will be having a childrens' turnabout sale. A couple of churches in my area do it twice a year. Once right before the spring and again right after the school year begins. For a small sellers fee and a percentage of your take, they do all the selling. You only need to mark the clothes with a short description, size and asking price. Drop the clothes off at the church a couple of days before the sale and pick up your money the day after it ends. All leftover clothes can either be picked up then or else can be donated to charity. I made over $200 a few years ago with my kids' outgrowns. I plan to do it again this spring. If you can'f find a church that does this, maybe you can convince your church to give it a try. Everybody wins with a set up like this; the sellers, the buyers, the church and the charities.
Also, look into a few of the indoor flea markets. You may be able to get a booth for just one weekend. Certainly would beat being outside in the frigid weather.
Save your collectibles for eBay. Anything that may interest a collector will probably get you a better price there than you could command at a garage sale or flea market. List them individually, not as a lot of items.
Hope some of these I ideas helped. Keep a warm thought and just remember, it could be worse. It could be cold AND snowing!