Driving stick shift in heavy snow, rain or wind can be dangerous if not done correctly. If driven correctly, a manual transmission car can be more effective than an automatic car in extreme weather.
Downshifting can be very helpful in slick conditions. For example; if the road is snowy and you find yourself going down a hill, downshifting gently and progressively is an easier way to slow the car down than stepping on the brakes. Stepping on the brakes can possibly cause the wheels to lock and for you to lose control.
Granted, if you downshift too abruptly, you can also cause the wheels to lose traction and control. The trick is to be comfortable with the clutch and the gear box.
Pulling off in severe weather is generally easier in stick shift vehicles because you can control the acceleration to a higher degree in a manual car. Just letting off the clutch slightly until the car begins to react can help you crawl out of snow and ice more effectively than releasing the brake in an automatic car.
While there are advantages to driving stick shift in extreme conditions, there is still a bigger learning curve than automatic driving. Being proficient in stick shift driving is the first step before being able to handle extreme conditions more effectively.
The advantage is definitely there. It’s up to you to learn what it takes!