You needn't worry about LiFePO4 in high heat situations, the composition of these is far less volatile than LiIon, and even those will tolerate quite a lot of heat as I discovered watching my car burn up with a powerful LiIon flashlight still in the center console
As long as you're using high-quality stuff, the worst you'll experience is a shortened user-life and that isn't likely to be significant enough to worry about.
What matters here is that you do not charge outside of the recommended heat range; discharging limits go far beyond that. Also never use any lower-quality Lithium battery products- that's where almost every known issue with Lithium batteries and cells originates from. There's a lot of energy density happening here and anything less than high quality is risky even within the manufacturer's stated limits.
On the larger LiFePO4 batteries, every one I've seen reviewed in the last few years has a BMS with high-temp charging protection but may lack the same for low-temp charging limitations. The big problem with that has been that most battery makers claim to have low-temp protection but actually do not. Now that folks like Will Prowse, David Poz, and Hobotech who have popular YouTune channels about this technology have made that situation well known, more of the cheaper LiFePO4 batteries are being equipped with low-temp sensors that work
Many of the better outboard charge controllers like Victron will also have low-temp protection built in so as long as you know what is what and configure everything properly it's quite safe
Phil
