It's cold. Getting down to -10 degrees F is not odd for winters for us. In a typical winter, we will get a foot or more of snow that sticks around until early March. This winter that we just had was unusually warm.
I don't have a north facing window. I have a southeast facing window that I currently grow my dendrobiums in. It's overcast here for most of the winter. We don't usually see much sun at all in the winter months, so I don't think it matters what window I put any plants in as far as wintering them. They are going to get less light, whether I want them to or not. I can provide artificial lighting to supplement though.
I have a spot outside that gets full sun the entire day from spring until late fall, but it's on my deck. It's totally exposed, with shade from the house happening in the late afternoon until evening. So it would get a lot of light there. Maybe too much though since it is very direct sun over the deck and I can't even stand to sit out there between 11 and 2, even with the umbrella open for shade.
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