Sentence : Judging from the weather conditions each day, when will the road surface be most slippery? I'd probably write this as: Judging from the daily the weather conditions, when do you believe the road surfaces will be the most slippery?

if you use 'each day', your point will not be clear you could reform your sentence and say something along the lines of "Judging from the weather conditions this day/week, when would the road be the most slippery?"