How can a valley surrounded by mountains be fertile and rainy?

We all know about Rain Shadow - And if you don't now you do - and that the inner side of a mountain as compared to the ocean would be drier.

Now a worldbuiding problem going around that phenomenon. Imagine a large and wide valley (several dozens of miles wide in all directions) surrounded by tall mountains in all sides. Should be a desert, right? Except it is not. It is a lush and fertile land, with rainy seasons and extensive flora and fauna.

This is not reality-check so no frame challenges please. Stay science-based so no magic. Within the premises above, what conditions would cause such an environment?

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How can a valley surrounded by mountains be fertile and rainy?

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