For what it's worth, I too stopped using REX Essential Plus Overdrive.
The whole process of setting up the weather for a simple flight just took FAR to long.
Some of the people on this site use REV4, and to me it looks better.
I'm using
OpusFSI now, as it offers me some unique benefits, and is much faster than REX Essential Plus Overdrive.
But as to your question, I would suspect that you've somehow set up REX with snow as a default weather.
If you can't find such a setting, you may have to do a complete uninstall. So look carefully.
Do not use the windows uninstaller as the REX settings will probably be left on your drive.
I've been using
Revo Uninstaller for about 10 years. It'll do an excellent job removing the settings from both your hard drive & registry. I trust it completely.
Be aware that it'll also remove the REX licensing file too, so make sure that you have that before removing REX with Revo.