Vanilla originated in the foothills of northern Veracruz state in Mexico.
Here's an interesting article on the history and growing of it at its place of origin. It is hot, humid and rainy all year, you can check the weather using the city of Papantla, Veracruz, Mexico.
The vanilla orchid grows well here where I live on the Yucatan peninsula of Mexico. We don't have the pollinating bees so it won't produce pods unless you hand pollinate it. It needs water in our dry season and prefers a sheltered location where the humidity stays higher, bright light but not direct sun and something to climb, it's a vine.
I would say as a general statement that the higher the temperature the higher the humidity should be. Papantla has a season with slightly less rain in the winter but I would assume that the humidity never gets below 60% and was usually closer to 90%. Annual lows are probably in the high 60's F (around 20C) and highs around 95F (35C).
Research the conditions of its native area and you will find the perfect conditions for growth.
Israeli Vanilla
however, tehy also like high humidity, which you do not have much in Israel (except Ein Gedi or so around the Dead Sea, but then the weather is really too hot!). As you sometimes have quite cold weather and sometimes even snow, the plants should be protected for those events... They like it also with sun, but you also have too much of it... therefore, you would need to use shadow nets, as you usually do with many cultivars in Israel too (this has the advantage of increasing humidity too!). Then, once you have stablished your plants you only need to wait for them to bloom, and start pollinating them manually, in order to have the pods.
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