Shortly put, "weather" is short-term, localized state of atmosphere (e.g. "There will be rain tomorrow in NYC"), whereas "climate" is long-term, more extensive

Shortly put, "weather" is short-term, localized state of atmosphere (e.g. "There will be rain tomorrow in NYC"), whereas "climate" is long-term, more extensive environmental conditions (hence "average" and "over a period of years"). Scientists first use the term "global warming", and then when the denialists point to localized temperature decrease as counterevidence (totally ignoring the global part), we adopt the term "climate change". And now the skeptics say the reason we switched the term is because it's wrong ¯\_(ツ)_/¯