Now that it actually is cold where I live, I'm starting to think hard about knitting warm sweaters, a hat for my daughter and lots of other goodies to keep us warm for the next few months. Which I'd say means I'm way too late thinking of these things, but I'm a pretty fast knitter.
If you need some goodies to keep you and your family warm, too, check out Knitting the Chill Away. This book features 30-plus patterns for men, women and some sizes of children that are heavy on the cables and textured stitches, which means they're heavy on warmth, too. There are sweaters, hats, scarves, mittens, even wraps, a bag and pillows to help keep you cozy inside and out during the cold season.
Even if you don't think you could knit a sweater while the weather is still cold, there's plenty of time to both knit and use some mittens and hats. If that's more your speed, check out Lila Sargent's book Snow Day Sets to Knit. (Compare Prices.) This book includes a basic mitten pattern and seven sets of hats and mitts, sized from toddlers up to adult large, so you can knit them for anyone and everyone in your family to keep them warm no matter what the season brings!