Clear A clear day. No penalties or modifiers. Fog Fog reduces accuracy is on ranged weapons. Rain Rain reduces accuracy on ranged weapons, extinguishes fire, and slows people down. Dry thunderstorm Dry thunderstorms are dangerous because the lightning can start fires and there is no rain to put them out. Rainy thunderstorm The lightning will start fires, but the rain will put it out. The rain also reduces movement speed and shooting accuracy. Foggy rain Reduces accuracy and movement speed.