Seasons in flight simulator

In flight simulator environment, there are five seasons:

The main difference between the two winter textures, is the snow on the ground in Hard Winter. Seasons are different across the world at any one time, and this information is held by Flight Simulator for the 12 months of the year. Seasonal information does not vary at all in the simulation within a month, and changes on midnight at the end of the month to the new season.

The problem is, those predefined seasons are not accurate in flight simulator. For example in some countries and places, the environment is look like fall but in flight simulator it shows winter or hard winter or even summer.
Fortunately it is possible to fix wrong seasons in flight simulator by an add-on and in this demo I am going to show you an example how in a same day of the year, there will be four different seasons in one place.

You can even download and test this demo inside your own flight simulator to see how it works.
This demo is made for arlanda airport (ESAA) in Stockholm_Sweden

The area that will be affected by this demo is like this:

Area

How does this test work?

I made 4 different BGL files:
1- Arlanda.bgl for Winter
2- Arlanda.bgl for Hard Winter
3- Arlanda.bgl for Spring
4- Arlanda.bgl for Summer
I put them in separate folders with different names showing their types

folders

Everytime I copy only one of these files to [Flight Simulator main folder]\Addon Scenery\Scenery folder and run the fligt simulator with these conditions:

When I start the flight, I can see the season (that I copied its BGL file into Addon Scenery\Scenery folder) will be shown in Arlanda airport for the area that is defined by that BGL file.

Here are the results of this test:

Click on any image to see the real size:

Winter
Hard Winter
Spring
Summer

Download these BGL files and test yourself

If you tested this in your flight simulator, don't forget to delete the BGL file from your Addon Scenery\Scenery folder at the end!