I live in the Willamette Valley in Oregon, and we are cloudy basically all winter long. I don't need a grow light at all and I am currently growing phals and oncidium-type plants.
My orchids all do fine as long as I have them near a light window- even with the clouds. You growing zone is also 5a, and your humidity looks like it is about 35-60%.
I think many commonly available orchid species like 40%-80% humidity.
Try to find orchids suited to this!
I think many common ones will work for you like phals, oncidiums, brassias, and most oncidium-type orchids.
For temperatures, orchids seem to like what people like. You can get a lot of cool-growing species (like my favorite, the Nelly Isler) that may not work as well for people in places like Florida or California where it's hotter all the time.
Check if there's an orchid society in your area! If you get hooked up with them, they can point you to shows, give amazing advice, and probably get you hooked up with some pretty interesting plants.