This Saturday I am IAH-EWR, EWR-FRA. The IAH-EWR is scheduled to arrive at 4:00pm. EWR-FRA departs 7:15pm. There is a chance of showers, but not ice or snow, in Newark on Saturday. Should I take an earlier flight? I have never connected through EWR so I don't know how they handle a little weather.

Also these were ticketed separately. If I am late even though because of their flight would I just be out of luck with them helping me find an alternate that was not full fare?