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).
Compare New Hampshire Propane Prices. Source: EIA Data. The following New Hampshire propane prices are published between the beginning of October and the end of March only. The most recent/current year appears immediately below, while historical New Hampshire propane prices appear further down the page under headings showing earlier years. Mar 27, 2017 $.