Apart from forgetting the 'the' your sentence is correct, but this is a more natural way to say it:
Today it is the middle of the March, but I look outside through the window, and I can see only snow.
And you are right, it's -5 in the Netherlands even in the night and morning, and I keep on moving the flowers in and out from the balcony to my living room, and back again.
Today is middle of the March, but i look to the window and see snow only.
Today is the middle of March, but I look out the window and only see snow.
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