MVAC? Temp? Weather Station?

I was wandering around the web thinking about how cool it would be to have temp graphs on my MRTG read outs. Now I have our two production servers doing exactly this (thanks to dell open manages support for SNMP) but its only internal temperatures. I’m really more intrested in external temperatures. Whats the temp in my house? What about outside? I’ve seen this done a LITTLE bit, very little,...