An accessible software package which allows individuals to develop models on the impact of climate in both plants and animals. CLIMEX is used in over 20 countries to examine the distribution of insects, plants, pathogens and vertebrates for a variety of purposes, including biogeography in quarantine, biological control strategies and impacts of changes in climate and climate variability. It can be used to compare climate at different locations, compare climate across a number of years and to match climates against pre-set criteria.