I loved this idea for a poster which will keep us busy all year. It's called the Weather Tree and there is a leaf for each day of the year.
You have to decide which colours are going to represent each weather type and then fill in the key below the tree. There is a special space for the name of the person(s) whose tree it is and the year it was completed.
All around the tree are drawings with information about the seasons and the weather, such as cloud types
facts about snowflakes
I'm, sorry of course I mean the children (!), are going to enjoy filling this in over 2012.
EDITED to say the company selling these posters can be found here http://www.phoenixtrading.com/ Items are purchased through a 'trader' but if you don't know one in your area then you can complete an on line form and someone will contact you.