YOU SAID:

The microwave was warm in the winter, and so it began,

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冬は電子レンジが暖かかったので、始めました、

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The microwave was warm in winter, so I started ...

INTO JAPANESE

冬は電子レンジが暖かかったので始めました...

BACK INTO ENGLISH

I started in winter because the microwave was warm ...

INTO JAPANESE

電子レンジが温かいので冬に始めました...

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The microwave is warm so I started in winter ...

INTO JAPANESE

電子レンジが暖かいので冬から始めました...

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The microwave is warm so I started in winter ...