When you connect to SimLink or VATSIM with XSquawkBox, by default it uses "live" network weather. Of course this is a Good Feature™ if you're flying in VATSIM under ATC as otherwise you would have to tell the controller you were not using VATSIM weather. However when you're flying in SimLink, where we expect a degree of autonomy, it can cause a problem.
For example, I've had a problem in SimLink where I would override the weather in X-Plane 11's set-up, say to CAVOK, and a few minutes later it would mysteriously reset to something else. This was especially embarrassing while leading a group flight recently when I'd set a nice clear sky - for taking screenshots on approach - and it suddenly changed to a foggy Cat I on short finals!
Fortunately this problem can easily be fixed. I traced it to XSquawkBox and its periodic weather downloads. They can be stopped by adjusting XSquawkBox's preferences and setting "Check Weather every" to zero minutes. (See pictures below, with relevant section ringed in red.) The weather will now stay as you have configured it within X-Plane 11.
Setting the preferences this way also removes another annoying problem. Weather updates can cause a stutter or sharp dip in frame rate if you have XSquawkBox running and connected. This is especially so if the server does not have weather for where you are, which causes XSquawkBox to "thrash" (yes that really is a genuine computer science term!) as it tries to find a weather station nearby, sending potentially hundreds of requests to the server. Setting the check weather update period to zero stops this stuttering and your flight is smooth.
For more information on this, please read the XSQUAWKBOX USER'S GUIDE in X-Plane 11\Resources\plugins\XSquawkBox\Docs.
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