98 S-10 Blazer won't start sometimes

Battery connections. Check the connections from the battery to the starter! Also check the battery terminals. Clean the battery terminals with a battery terminal brush. Clean them until the are bright not dull and coated with a dull erosion. Clean them terminals and that mostly is the problem on most of the starting no starting problems, more than fifty percent of the time. Clean them terminals. And yes it has something to do with the weather. In the summer in fair dry weather the vechicle may start, in damp cold weather the vehicle may not start. Clean them terminals.