What you've written is intelligible and largely grammatical but it isn't very elegant in my opinion. Saying that you "realised" you were reminded of something seems redundant, "all of what was going on outside" does not seem a very natural way of referring to the weather, and "the tale" also seems a bit of an odd insertion. The "windowsill" -- the bottom part of the frame of the window -- is not a likely thing to peek at when one is assessing the weather.
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