Translation of particle で in 「オーストラリアは今夏でとてもあついです」

オーストラリアは　今　夏で　とても　あつい　です。

Does this sentence mean:

• “Australia is currently in summer and it's very hot”. Or,



• “Australia is now very hot in summer”.

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I know that the Japanese sentence could follow the sentence pattern below.

オーストラリアは　今　夏です。　とても　あつい　です。
オーストラリアは　今　夏で、　　とても　あつい　です。
(I have seen sentences where there is no comma after で.

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Or, the で could be used to say, "in summer".