Here's a great conditioning recipe for avoiding dry hair in the wintertime:

1 egg yolk
1/2 tsp honey
1/2 tsp lemon juice
1 tsp vinegar
Combine ingredients well and massage into scalp and hair, ensuring you are getting the entire length of your hair saturated with the mixture. Leave on your hair for one hour (if your hair is long, secure it with a plastic hair clip and put a shower cap over it to prevent drips.

Rinse and wash your hair as normal.