Weather changes from year to year.  There are also reports that NOAA is manipulating the data so that it fits into the idea of global warming.   As far as humans affecting it, I believe we are a minor component.   There are a lot of things going on besides what we do.  There is methane being released from the ocean floor.  There are volcanic eruptions.  The earth is changing it's tilt and magnetic fields.  The sun goes through different phases.  Those are just some natural developments that change the climate and environment.   With all of that, do you think we are really going to make that big of a difference?