Does Cold Temperature Actually Affect the Level Gauge on a Propane Tank?
Like most other kinds of materials, propane is affected by cold temperatures. As the temperature goes down, the propane gas contracts. That reduced level of gas inside the tank is reflected by the gauge which reflects the level on the tank. Normally, this comes into play whenever a homeowner checks the gauge in cold weather conditions and sees the amount of the tank level before and after delivery. Depending upon the conditions, the tank level may not go up as much as anticipated.

Propane Tank Level Gauge
The propane tanks guage will show what fraction of the gas tank is still full. Tanks are usually not filled more than 80% full because this would allow for the gas to expand on warmer days. For instance, a 500 gallon tank, at a reading of 80 percent at normal temperatures reflects approximately 400 gallons of propane in the tank. This is around the amount that can be stored.

Normal Temperatures
The propane industry operates the popular website Propane 101, which considers the propane reference point to be an exterior temperature of 60 degrees. For example, if the gauge reads 50 percent of capacity on a day when the temperature is near 60 degrees, then a 500 gallon tank would contain approximately 250 gallons of propane. If the temperature that day is a lot lower than 60 degrees, the gauge would read lower. Also, if the temperature is a lot higher than 60 degrees, the gauge would actually read higher due to the expansion of the gas.

Effect of Contraction and Expansion
According to the information provided by the propane industry web site, the amount of energy contained inside the tank does not actually change as the gas contracts or expands. The amount of propane itself has not changed, but only the density of the gas has changed.

Cold-Weather Delivery
The homeowner who orders 100 gallons of propane would receive approximately 424 pounds of propane. With the delivery of 100 gallons, the homeowner with a 1000 gallon propane tank can expect the guage to go up by 10%. These numbers will be correct if the temperatures were close to 60 degrees at the time of delivery. If the delivery happened during colder weather conditions, these chillier temperatures will cause a smaller increase reading on the propane gauge.