The United States Energy Information Administration offers a partial listing of propane prices per month from 1985 to present day. The EIA updates this chart weekly with the latest information on propane prices, but does not keep records on summer propane prices, tracking only prices between October and March.
In addition to historical records, the EIA also offers analysis and predictions pertaining to propane prices. The year 2014 saw the most expensive propane prices ever recorded; the peak price occurred in February, when propane sold on average for $3.69 per gallon. This represented a 59 percent rise from the cost of propane in February 2013.