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I have never heard it when it is raining. I will let you the next time that I hear it. I listened to the You Tube link and the hum that I hear is not so much a buzz... it does sound somewhat like a diesel engine at idle but not quite. That is a close description. I have excellent hearing and I am 58. I also am also fluent in Morse Code at speeds of up to 45 WPM and I have never heard any code characters. I have also heard it just stop... sometimes not returning until the next day... sometimes returning very quickly. I do think that it is using certain resonant structures as transducers because I can only hear it from one room in my house and it is not any external source because I have actively tested and eliminated anything within a 1/2 mile. I live in a very rural area and there is no industry nearby. I do hear a train that has tracks about 2 miles from me but that is distinct and is always heard from anywhere I go... including outside.