Climate refers to a number of phenomena relative to a region and its weather.
- Earth's climate is presently in a period of long, slow recovery from the Little Ice Age that ran for 300 or so years and ended in about 1850. 
- "On all time scales, there is very good correlation between Earth's temperature and natural celestial phenomena such changes in the brightness of the Sun."
Climate affects the viability of flora and fauna in a given region. It also affects human beings desire to live (or not live), or vacation, in certain areas.
Factors to be taken into account in order to describe a climate include:
- Minimum cold season temperature
- Annual rainfall
- Length of periods without rainfall (droughts)
- Likelihood of regular flooding
- Wind speeds encountered
- Cloud cover versus sunny weather
The Köppen Climate Classification System is the most widely used for classifying the world's climates.
- Main article: Climate change