Originally Posted by
Dangerous Dave
My front light didn't work two weeks ago in 28 degrees. Thankfully, there were no police and the area was well lit, so I could see. The red light still worked, so I could thankfully be seen. I looked at the light next morning and it was working again in the 37 degree weather. The light has worked perfectly in 31 degrees, so it seems there is a cutoff around 30. Maybe something or other freezes, and at 31 it hadn't quite had enough time to freeze. I also forgot my hat that 28 degree evening, which meant my ears hurt a lot by the time I got home.
I have been follwing Northern USA/ Canada weather and it has looked unseasonably cold.
Do you leave your bike outside? If so, take your lights off and bring them inside with you. If not, sounds like it's just time to replace your batteries.
My lights have regular ole alkalines in them and work fine for my five mile commute in even below zero temeratures.