A change in the underlying weather statistics is evidence of changing climate. We can make out the climate-change signal quite clearly in several instances, for example:
Record Hot and Cold Days in Australia, 1960-2009California Heat Waves, 1948-2006Extreme One-Day Precipitation Events in the Lower 48 States, 1910–2008Canada Winter Temperature Departures, 1948-2010Trends in Historic European Droughts, 1962-2004NOAA: ‘North American snow cover for April 2010 was the smallest on record.’Global statistics also show that climate is changing, for example:
NOAA: Hottest April and hottest Jan-April on recordChanges in regional weather statistics such as these support the theory that climate is changing globally. These observations disconfirm the claim that global climate is not changing.