It’s true that environment plays a role in many plant traits. With some traits it plays a larger role, and some a smaller role. Scientists refer to this by “G by E” or genetics by environment. There is beginning university research to show that cannabinoid pathways are largely controlled by genetics – over 80%, and the remainder 20% is influenced by environment.  This is great news!  Stable cannabinoid profiles across regions is absolutely attainable in well-bred varieties, as evidenced by many EU and Canadian varieties. It is likely that the variation seen in the current market is due to poorly bred genetics.
As with any plant species, the best seed is well bred for adaptation to your specific region and climate. Though major traits will remain stable, variety performance will vary slightly within a region. Importantly, cannabinoid content should not have significant variances.