This is inspired by a quick gander at the answers (in particular, the Empire Weather tables) to Randomly-generating weather for a sandbox campaign.
How do you adapt Empire Weather, or a similar random weather generator, to the increased detail needs of a campaign where flight plays a heavy role? Cloud ceilings, surface visibility, freezing layers both at the surface and aloft, and wind speeds and directions all play into a variety of "go/no-go" decisions before and during flight, and from what I can tell so far, random weather generation approaches are simply not up to the task of providing such a degree of detail. Or, is this a sign that I should scrap the notion of random weather altogether and simply grab weather from climatically similar real-life locations?
Never mind the look on your face when one of your PCs is trying to get off the ground in a Cessna 172 and asks "...what's the altimeter setting for where I'm at?"
 Altimeters in aircraft need to know the surface barometric pressure to read accurately -- this is one of the reasons why just about all real-life weather reports have the barometric pressure in them.