[wxqc] Sensor drift

[Sam Drinkard]

I am experiencing what I believe to be sensor drift on the barometric 
pressure sensor.  I've been following the diffs between my station and 
KDNL / KAGS now for about two weeks, and altho a good portion of the 
time, we are within 0.2mb of each other, last night, I was showing about 
1.5mb or better between the two, with my reading being the higher.  The 
only fly in the ointment is the fact that KHQU, Thomson GA, ASOS was 
showing yet a higher reading than I was, by another 0.20 mb.  I know I 
should not try to match most readings based on graphs, but baro pressure 
I'd think should be very close, given our very similar altitudes. 

In short, does anyone have any first hand knowledge or even theory that 
the Davis baro sensor will, in fact, drift with change of temperature, 
or time?

Regards,

Sam