Step one: read through your speech outloud, record yourself at this point.
Step two: listen to the recording whilst scanning your speech, notice where you stop and pause for breath. Do your pauses mean that key phrases are lost?
Step three: mark your copy with to indicate phrases. You will end up with something that looks like this:
We are all aware of how the weather affects our moods/ but do we also think about the effect on our animals?/ Do we consider how miserable,/ how uncomfortable/ or how confused they may feel when they first encouter snow? /
By marking your phrasing, you break up the speech into manageable pieces and, most importantly, remind yourself to draw breath from time to time!