Average weather conditions for a particular area measured over multiple years or decades. For questions on climate change use the [climate-change] tag.
Climate is the long-term average weather sitation for a particular area on Earth and for a particular time of year. Since this average is measured of multiple years, or even decades a climate is relatively stable.
For questions on climate change see climate-change
For questions on ancient climates (before the use of weather instruments) see paleoclimatology
For questions on mathematical models of climates see climate-models