Does Cold Temperature Affect a Propane Tank Level Gauge?
Similar to most other types 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 tank level. Often, this happens whenever a homeowner checks the gauge in cold weather and sees the amount of the tank level before and after delivery. Depending upon the conditions, the tank level might not rise as much as expected.

Propane Tank Level Gauge
The gauge on a propane tank shows you what fraction of the tank is full. Usually, tanks are not filled over 80% so as to enable the gas to expand during hot days. For example, a 500 gallon tank, at a reading of 80 percent at normal temperatures reflects around 400 gallons of propane inside the tank. This is around how much is able to be stored.

Normal Temperatures
The propane industry operates the popular web site Propane 101, which considers the propane baseline point to be an exterior temperature of 60 degrees. For instance, if the gauge reads 50 percent of capacity on a day when the temperature is near 60 degrees, then a 500 gallon tank will contain approximately 250 gallons of propane. If the temperature that same day is much lower than 60 degrees, the gauge will read lower. In the same way, if the temperature is much higher than 60 degrees, the gauge will actually read higher due to the expansion of the gas.

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

Cold-Weather Delivery
The homeowner who orders 100 gallons of propane will be given approximately 424 lbs. of propane. With the delivery of 100 gallons, the homeowner with a 1000 gallon propane tank could expect the guage to go up by 10%. These numbers would be correct if the temperatures were near 60 degrees at the time of delivery. If the delivery took place during colder weather, these chillier temperatures will result in a smaller increase reading on the propane gauge.