The first tomato has catfacing, which is usually blamed on cold temps during early development, but can also be caused by a number of other factors. Beefsteaks are more prone to catfacing than other types. Sometimes it results from abnormal blossoms. Other times from too much nitrogen, so you're on the right track to suspect it could be due to a weather-related changing growth rate.

The second looks odd, but I'd call it catfacing also, because of the "zippering" that runs across the odd spot from stem to blossom-end. Zippering happens when an anther remains attached to a baby fruit. It's usually seen without catfacing, but sometimes the two are seen together.