Monthly Returns

Recently, I was looking at January and checking out something that investors mumble in January, namely:
"As January goes, so goes the year." (See January predicts.)
Anyway, that got me thinking ...

>A mistake!
... thinking that it'd be interesting to look at the returns each month over the past umpteen years for (almost) any stock.

Hence the spreadsheet which looks like this (where you can click on the picture to download it):

Though Yahoo has DOW data back 50 years, the spreadsheet only goes back 30 years.
Some examples: