Join Date: Nov 2009
Location: Carrollton, Texas
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I have used bike computers year round. When the temps are cold, say freezing or below, the display on some units becomes sluggish, where rapidly changing numbers - say your speed - are hard to read the least significant digit.
In extremely hot weather, over 100F, the entire display may turn black. This is only temporary and does not affect the computed distance or speed.
There is a newer lcd technology that does not suffer from these temperature effects, but the lower-cost bike computers all use the cheaper, older tech. No permanent problem, just temporary funky displays. No need to worry.