Dew point is the tempurature the air cannot hold the weight of the water in it. The water then begins to condense and form droplets. This tempurature is always below or equal to the air tempurature.
Propane prices. Maine (ME) propane users spent an average of $2.724 per gallon over the 2012-2013 heating season. This is slightly higher than the 2.436 average for the country as a whole, for the reasons explained above (distance from major supply source, colder climate, higher demand).
Indeed, Wisconsin (WI) propane users go through 692 gallons of propane per year on average (for 464 gallons in the entire country), spend $1,227 per year on propane on average (US: $973) and $1,297 per year on propane for heating on average (while the figure is $957 for the US as a whole).[1] Wisconsin (WI) US.