When looking at seasons in different systems, you will find the Warm Spring and Warm Autumn, and assume it is the same (roughly) as the True Spring and True Autumn, and the Cool Summer and Cool Winter and assume it is (also roughly) the same as True Summer and True Winter.

But then you come across the adjective of Pure, which you would think would equate to True, but it doesn't. This is mostly in the 16 season system, like Ferial.

Pure Summer is like True Summer and Pure Autumn is like True Autumn.

True/Warm Spring is actually referred to as Shaded Spring.  And True/Cool Winter is actually referred to as Tinted Winter.

Pure Spring is actually Bright/Clear Spring and Pure Winter is actually the Bright/Clear Winter.

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... but hey, don't listen to me, EXPRESS YOUR TRUTH! Jane