My new window sill set up - Is this curtain too much?

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There is a chance you don't need any curtain now, in mid-winter. You certainly will sometime before summer. Buy a small, cheap house plant than needs shade. Put it in that window. After a few days you will know whether it is sunburned or not. I suspect your plants will do fine without the sheer curtain now.

I lived in Milwaukee when I was a kid. I only saw sun on snow a few times. Mostly it was gloomy and grey all winter long. February was the worst month.