AnomalySounds like a 300 RPM large engine. Well, I didn't get this from someone else. I previously thought this might be some sort of machinery from a gravel pit a few miles away, but it hasn't stopped in 5 weeks now. After going nuts about it, just today I typed this into the internet and see I may not be alone.
USA Grand Junction, Colorado · 2018-03-05 · from the WORLDHUMMAP archive
An account in USA Grand Junction, Colorado
What they reported
First noticed: 2016
Pitch: Closest 56 sine & 2nd closest 32 Triangle
Loudest: During the night
Where: Indoors
Symptoms: Sense of vibration, As nobody else is hearing it, I wonder if I'm going nuts! My hearing is damaged at higher frequencies, but on my last detailed hearing test the analyst remarked on how good my low frequency hearing was...above normal.
Changes with weather: First heard in winter of 2016, don't recall it in the warmer months, then winter of 2017 and now again starting early Feb. 2018.
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This is a Hum report from Dr Glen MacPherson's World Hum Map, an open, worldwide record of people who hear an unexplained low-frequency hum. Reproduced with permission and with thanks; the project is at thehum.info. We remove anything on request. Location shown is approximate.