I've read a few times that such-and-such a plane is an "all-weather" aircraft, for example:
The McDonnell Douglas F/A-18 Hornet is a twin-engine, supersonic, all-weather, carrier-capable, multirole combat jet.
This is quite intriguing and a rather odd thing to specify.
A fighter that couldn't be operated in for example rain (perhaps because it might dissolve, rust or leak) wouldn't seem to be much of an asset to one's air force.
Similarly, I would not expect a supersonic fighter to be unable to deal with gusty winds, or a heatwave, or really, anything else the weather might be expected to throw at it.
What sort of jet would not be an "all-weather" aircraft?