A/C issues Mitsubishi 03

So my AC does not work in my car; however, it strangely enough works when it is raining and in higher elevations. I had my dad check the compressor and he said that it is not working-the clutch is drawing in 3 volts but does not engage with the compressor (but it does work when it is raining-could it truly just be an issue of needing a new compressor?)…I was wondering if anyone has seen this issue before or has any ideas on how to fix it. Thank you!