Neither one. Snow starts to melt at 0 c, so you'd be looking at really ugly conditions at 10 c. 40 c is a good temperature for water skiing. Minus-10 c would be a fine temperature for snow skiing; minus-40 c would be dangerous because of the risk of cold weather injury.
20f. 20c is 68f, a brisk spring day. There would be no snow at 20c.
-20F
20c is hotter.
It is about 20F and -7C.
It is about 20F and -7C.
I think its about 20F to about 60F.
55
-20F to +100F
july is 54F january is 20F
well it depends it can range from somewhere around -20F to 90F
The best commonly available ice melter by far is Calcium Chloride, works to -20F. Followed by by Magnesium Chloride, works to +5F. Then Sodium Chloride (salt), works to +20F. Calcium Chloride does not affect concrete nor damage vegetation but it can leave surfaces slippery.
It is about 20F and -7C.
20F