|Thank you for update.|
As earlier - suggest you use better quality cable if possible; and whichever type you use ensure it's enclosed in conduit. Plastic will be fine.
Ensure it's not too near the surface to be overly chilled (frozen) in such weather; but also no need to be ridiculously deep either.
Typical cable types are not spec'd/designed for long term exposure to the elements - sun, rain, snow, frost... Also many little furry creatures seem to like a nibble of some casings/sheathing (squirrels especially). Suspect they enjoy a mild high from the chemicals in it; and per chance a given cable has a few volts on it (typical phone cct. to your home) they get a mild "thrill" too...
Also not wise to have more than three in-line connections in the path - excluding those at the ends (the in/out).
This is one of many excellent resource sites re' cables various:
And I defer to their comments re' cat-5, cat-5e etc.
Cat-5e would allow use of higher network speeds anon if you wished to there...?