Does Cold Affect a Propane Tank Level Gauge?
Similar to 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 in the tank is reflected by the gauge that reflects the tank level. Often, this happens whenever a homeowner checks the gauge in cold conditions and sees the amount of the tank level before and after delivery. Depending upon the conditions, the level on the tank may not rise as much as expected.

Propane Tank Level Gauge
The propane tank's gauge shows you what fraction of the tank is full. Usually, tanks are not filled over 80% so as to allow the gas to expand during hot days. For example, a 500 gallon tank, at a reading of 80 percent at normal temperatures reflects about 400 gallons of propane inside the tank. This is roughly the amount that could be stored.

Normal Temperatures
The website Propane 101, that is managed by the propane industry, considers an exterior temperature of 60 degrees to be the reference or baseline point. Like for instance, if the gauge reads 50% of capacity on a day when the temperature is close to 60 degrees, then a 500 gallon tank would have around 250 gallons of propane. If the temperature that same day is much lower than 60 degrees, the gauge would read lower. Similarly, if the temperature is much higher than 60 degrees, the gauge will actually read higher since the gas expanded.

Effect of Contraction and Expansion
The amount of energy contained or energy contained within a tank will not change when the gas either expands or contracts, according to the propane industry web site. 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 be given around 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 close to 60 degrees at the time of delivery. If the delivery happened during colder weather, these chillier temperatures would result in a smaller increase reading on the propane gauge.