The reason Zplit suggested 4x5 (or 4x6 for taller screens) is that it's what most people use for layouts like this. Especially if you've got already got both Iconoclasm and Gridlock, that layout gives you a LOT more flexibility without always having to swap layouts & respring. I didn't see a 4x2 layout on Cydia, and that's probably why.
You can always use Iconoclasm Layout Maker to create a 4x2 layout though if that's your preference. It's a pretty easy tool and you use it directly on the phone.
On the iWidget--there are two different types of Yahoo weather codes. One is all numbers. The other is a mix of numbers and letters. (Usually 4 letters and 4 numbers.) You may need to try the other code for your area. It *does* work with MyLocation though, at least on my phone.
(4x6 iPhone 5 layout, all icons in the bottom two rows only)
