Its not too cold ! You need to find a really tough strain that doesnt mind the wind, rain and varying temps, i could reccomend WSS skunk. I had a plant which i germinated inside and left in a pot outside since june this year, i didnt want any bud or anything i just wanted to see if it would survive the changing temps. Its seen snow, minues temps and is still bright green with all its leaves, very much alive. It is possible !!

Good Luck