AnomalySounded like a train in the distance that never ended but there are no cargo trains in the entire country. Maybe an idle engine for at least an hour. My wife wasn't able to hear it. The sound definitely seemed external to me because it would have a different volume based on what room of the house I was in. I turned off everything in the house to make sure it wasn't something inside that was causing it.
Granadilla, San Jose · 2019-07-30 · from the WORLDHUMMAP archive
An account in Granadilla, San Jose
What they reported
First noticed: 2010
Pitch: Maybe something like 65Hz sine
Loudest: During the night
Where: Indoors
Symptoms: Just annoyance
Changes with weather: Unknown. Its not always there.
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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.