You're just adding the temperatures, you then need to divide by 2 to get the average - so it's actually 51.35 fahrenheit (10.75 celsius).

To non-Americans, "global financial crisis" is the standard name we use for it. Inside the US (at least from my experience, when I lived there a few years ago) it was just financial crisis (without "global"), or the housing crash. Draw from that what conclusions you will about how Americans see their place in the world ;)