Sort of all depends on how your tolerance to cold is. Here in NJ, 45 - 50 degrees is fine. The only problem you may have is starting the engine. Use some lighter fluid (ronson.. cigarette lighter fluid) to prime the engine... put a couple drops in the carb and then let the glow driver sit for about 10 - 20 seconds to warm up the inside of the cylinder, then start it up. Keep the glow driver on for another 30 or so seconds before removing it. Run the new engine very rich.. according to manufacturers instructions on break in.

It may take a few seconds of constant turning with an electric starter, but go for it. It will start.

DS