It is super easy to add YoWindow weather widget to Blogger.
1. Go to your Blogger account.
2. Click "Design" link
Your blog design page will open
See "Add a Gadget" links?
This is where you can add YoWindow widget to your blog!
3. Click "Add a gadget" in the side-bar for example.
A new window will open with many gadgets you can add.
Now you need to fill it up with YoWindow HTML code.
4. Go to YoWindow weather widget page
There you decide how your widget will look.
Select your location and other options.
When you are done, copy the HTML code at the bottom of the page
Don't forget to give the gadget a title.
5. Go to your blog :)
Here you are - YoWindow widget is reporting your weather to your blog readers.