Wednesday: Go on a backyard icicle hunt
When your child spots fantastic creations, gently break them off (wearing gloves and taking care to stay out of the way if one should fall), and put them in a plastic bag. Find a place in the yard for your icicle display, then stick each one upright in the snow or in a planter that's filled with sand. You can keep adding to your collection throughout the season.
Winterproofing 101
Dress your child in layers. He can always peel one off if he warms up. In the meantime, those extra layers will keep cold and wet from penetrating. Insulated socks and boots, layers that "wick" moisture away from the skin, and waterproof mittens help, too.
Insist on hats. You know how kids' heads are large in proportion to their bodies? They can lose a lot of heat out of those big noggins.
Keep an eye on the clock. A few shorter sessions outside are better than one that lasts several hours.
Be there. Whether he's sledding or just building a snowman in the front yard, keep an eye on him (and no sledding near trees or the street). You'll do it for safety, but you'll also be able to see if he's getting too cold.
Slather on sunscreen. Sun reflects off snow and ice, so a wintertime sunburn is quite possible. Use SPF 15 or higher for exposed skin, especially the face.
Bring a wet child in quickly. If he continues to play outside in wet clothes, his body can get colder much more quickly.