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).
Residential propane price per gallon averages. While the US average residential propane price per gallon in November 2012 was $2.4 per gallon, the table below shows the average price difference between the two regions the US Energy Information Administration monitors. East Coast. 3.018.