Extreme weather includes unexpected, unusual, unpredictable, severe, or unseasonal weather. Often, extreme events are based on a location’s recorded weather history and defined as lying in the most unusual ten percent. In recent years some extreme weather events have been attributed to human-induced global warming with studies indicating an increasing threat from extreme weather in the future.
In general, climate models show that with climate change, the planet will experience more extreme weather. In particular, temperature record highs outpace record lows and some types of extreme weather such as extreme heat, intense precipitation, and drought have become more frequent and severe in recent decades. More information at Wikipedia.
Why climate change makes extreme weather worse.
Human Influence on Droughts Goes Back 100 Years
Scientific Studies Link Heat Waves to Climate Change
Climate change's role in severe storms and extreme flooding