On their Frequently Asked Questions webpage, the World Meteorological Organization asks and answers:Then he ignored the part about variability and waffled:
What is Climate?
Climate in a narrow sense is usually defined as the “average weather,” or more rigorously, as the statistical description in terms of the mean and variability of relevant quantities over a period of time ranging from months to thousands or millions of years. The classical period is 30 years, as defined by the World Meteorological Organization (WMO). These quantities are most often surface variables such as temperature, precipitation, and wind. Climate in a wider sense is the state, including a statistical description, of the climate system.
“Average weather” is a wonderful definition of climate. We know that weather is chaotic and that weather is always changing and has always changed…and will continue to change in the future. Therefore, climate is always changing and has always changed…and will continue to change in the future.
By blaming all changes in weather on mankind, reports like the U.S. National Climate Assessment Report imply that extreme weather can be minimized by eliminating our emissions of man-made greenhouse gases—providing a false hope to naïve persons of a future without hurricanes and tropical cyclones, without tornados, without blizzards, without droughts, without floods. They further suggest to those trusting souls that all we have to do to make weather nonthreatening on our planet is drive efficient cars, install solar panels on our roofs and install wind farms everywhere. That suggestion is not only misleading, it’s foolish. Weather has always changed, and it will continue to change in the future. Because climate is average weather, climate has always and will always change.
Seriously? Weather changes therefore climate changes? I haven't read so much codswallop at WUWT in three hours. Not since Paul "bring back smog" Dresden moaned that greenies (that is, normal people) want to modernise the energy sector.
Now I'm not absolutely sure that someone somewhere blamed global warming for the change from summer to winter, for the mist yesterday morning or the rain last week and the sunshine today, but Bob doesn't cite anyone who does. And just who has said to any person, let alone a naive person, that stopping greenhouse gas emissions will stop tropical cyclones, blizzards, drought and flood?
Just because the weather changes from day to day it doesn't mean that the climate will change from one thirty year period to the next. A change in the weather doesn't mean that the mean or variability of temperature, rainfall or wind will change. It takes more than a change in the weather to change the climate.
If Bob understood anything about climate and weather, he too would have known that.
But he doesn't so he doesn't.