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Yes it is very much required for the same reason that world changes from month to month!!
Business strategy and business planning must chalk out plan for how to run business in volatile economies. Risks of fluctuations in economy, currency fluctuations, fuel price fluctuations, etc must be factored while making a business plan, so that we can ensure business will not crumble in this scenarios. We must have a good contingency plan for such risks...
Strategy is like a compass. You need it the most during tubulent weather.
Strategies and plans should be made in all aspects of life and not only to work.
Even though changes happen per month as you said but it will never be very far away from your plan, so if needed you can manipulate and adjust your plan based on new changes that occurr.
So difintely plans and strategies should be set in advance.