Not bad, low 30's, I guess. I added a fleece scarf but was otherwise nice and comfortable. Well, I got my replacement battery pack from batterystore.com in record time but then proceded to break the bulb. Actually, the bulb was already going bad but I broke the prongs when I tried to remove it. So, until my new bulbs arrive (nobody carries them locally), I'm force to go half-ninja: all black with just one blinkie, no headlight. Also, got new shoes this weekend, much more comfortable than the others. Gotta get my bad weather tires on the bike soon.