I enter all my daily data into a spreadsheet template I made, and total up the year's/month's data. I actually use the same template for my real weather records as well.
To make wikipedia boxes I go onto a wikipedia article for a place with climate data, click "edit", and it shows something like this (though this is one I copied to my sandbox):
Each field corresponds with each of the cells in the wikipedia climate table. You just fill the numbers in and press save.