So anything extreme indicates global warming? Even Extreme cold? What about extremely moderate temperatures? Or, and extremely calm hurricane season? Or, extremely dark last night?

I guess you can make anything support your argument if you say any effect that correlates or contradicts your position is a proving factor. (?!?)

Andrew, I think the point is that higher ghg levels are putting more energy into the system. This pushes seasons forward and increase water vapor levels and thusly precipitation. That and seasonal arctic ice size are arguably the major indicators, but, yup, its cold n snowy here in Chicago, thats for sure...
Great point about extreme moderation. Fits in with my missive," everything in moderation...including moderation"