But that DOES NOT mean that global warming isn't real. This year's brutal winter weather is just that: weather. Weather refers to day-to-day local changes. Climate refers to average weather over a long period of time.
If you'd like to read more about how you can answer when somebody slaps his head and says, "Look at that snow! Guess Al Gore got it wrong!", click here to visit Skeptical Science, a website where you can find responses to climate deniers' dumbest arguments (my fave: "Jupiter is warming.")