Not all biome fog should be affected by the day-night cycle

[IntegratedQuantum]

[ikabod-kee]

You could make it a percentage, like "how effected is the biome fog by the day-night cycle?" 0.00 is no effect, while 1.00 is fully effected.

"fogPersistance" "fogEfficiency"

[codemob-dev]

You could check to see how low the player is below the heightmap perhaps.

[IntegratedQuantum]

It should be a per-biome setting. That's easier