This mod are a part of Foggy Weather 1.6.2 which are now under development, but that’s an other topic and you will get informations soon.
This modification brings you:
– Foggy/smoggy weather near west coast
– Foggy weather in desert
– Sandstorms in desert
– Cloudy/light rainy weather near west coast and desert
– Realistic temperature while fog, smog or sandstorms