It may very well be the moose.
If you can keep it sounding off when parked with the engine running, open the hood and see if the noise seems to coming from the air filter box, the hose running to the IAC valve, or the IAC valve. If it is, it is the moose. It sometimes helps to clean the throttle body and the IAC.
It is not uncommon for the noise to happen with weather changes. It is more often when the weather turns cold, but it also sometimes happens when the weather changes for the warmer as well.
A couple of other sources of whine are the power steering pump and the serpentine belt idler and tensioner pulley bearings. The sound is different, but the description of the sound is often similar.
