I recently developed a quantitative method for identifying cities which are likely to have a new temple announced. This method was developed by examining where current temples are located in the Church. There are four factors which contribute to the likelihood of a new temple announcement in a given location: Long distance from an existing temple, a large number of stakes and districts, stakes which have existed before 1981 in given location, and busy Saturday endowment schedule at the closest temple. I have developed a quantitative system for these four factors, which are summed to produce a temple likelihood value. If the score ascertained is greater than 20, a future temple in the given location is likely. If the score is over 40, a future temple is almost certain. It is important to remember that temples are announced by the First Presidency by revelation. The below maps provide possible locations for new temples based on the above criteria.
Below is a map of all the locations I think are most likely to sometime in the near future have a temple announced. Stakes and districts which could be served by a temple at locations provided are also included.
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Below is a map of all the locations I think are most likely to have temples announced in the year 2020. These locations are made based on current and past Church growth and assume that they will hold constant until 2020. Projected membership for some countries is also provided.
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The purpose for why I am so interested in where new temples will be announced in the future and why I make predictions is not so I can say "I told you so" if it happens. The purpose is to see what areas of the world are likely to see temples in the future, where the Church is growing enough and activity high enough to justify a temple and to have members prepare themselves in these locations for the possibility of a temple to be built.