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Months don't matter. In that region, the weather is always the same 2 variants year round: Hot & Humid and Hot, Humid & Raining.

This is the most important point, but also Singapore is in the southern hemisphere (barely), so December is technically spring/summer as well.

Singapore is in the northern hemisphere. It's north(west) of Pontianak which is on the equator.

We have 2 seasons.

Inside and Outside

I thought it was hot, hotter, and shopping

More accurately, it's raining or not raining.