How to take a winter photo with flying snowflakes if it is not snowing?
There are several ways to do this.
The first one is to wait until the snow starts :)
The second one is to add snow in Photoshop. It is not difficult.
Firstly, you need to take a picture of a winter landscape or a portrait. Then, you need to find on the Internet, or take a picture of a falling snow texture (on a black background).

After that, you need to go to Photoshop and follow these instructions:

1.Open the photo in the program.

2.Open the snow texture.

3.When on the snow texture, click the following: Ctrl+A (select) — the photo edge is circled by dotted line, Ctrl+C (copy) — the photo is copied to the buffer memory.

Come back to landscape/portrait photo.

5. On landscape/portrait: Ctrl+V — the texture of the snow appears over the landscape/portrait. You may see both layers in the "Layers" tab on the right.

Under the "normal" button select the "Screen" overlay mode.

6.Ctrl+T — transformation, it is useful if the snow texture does not match the size of the main photo. Pull the corner marker to adjust the size.

That`s it!

If any questions, I am ready to answer :)