Something else to consider is if the wire is new or older and by that I mean year of manufacture. Older types tended to be plain steel but newer types seem to be galvanized steel, zinc coated or something to that affect, basically to stop them from rusting. Rusty wire will obviously weaken over time but it's also a lot harder to see because it blends better with the background colours.
As for noise travelling further at night, as I recall it (although I'm trying to remember this from lessons from a few decades back so anyone feel free to jump in with corrections), there's two factors involved. First (secondary factor), is the lower level of background noise compared to daytime and second (primary factor), is that sound is conducted better in the denser air of night.
Apparently sound travels faster in a warm environment but it also needs material dense enough to effectively conduct the soundwaves.
So while air might be warm during the daytime, it also tends to be lighter and will rise, resulting in less density at ground level.
At night when the air is colder it will fall, it will also collect water vapour and both these increase its density compared to warm air.
Both these effects are constantly subject to environmental conditions so your experiences can be totally different in apparently similar types of location and also the same location during seasonal changes, different weather and so on.
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