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).
Typical costs: 1  During the heating season (October to March), the federal Energy Information Administration publishes weekly average propane prices in the United States. 2  Propane is a byproduct of oil and gas production, and in the past propane prices rose and fell in tandem with the cost of crude oil.