Does Cold Truly Affect the Level Gauge on a Propane Tank?
Similar to the majority of other types of materials, propane is affected by cold temperatures. When the temperature goes down, the propane gas contracts. That reduced level of gas inside the tank is reflected by the gauge that reflects the tank level. Often, this happens whenever a homeowner checks the gauge during cold weather conditions and sees the amount of the tank level before and after delivery. Depending on the climate, the tank level may not rise as much as expected.

Propane Tank Level Gauge
The gauge on a propane tank shows you what portion of the tank is full. Typically, tanks are not filled over 80% in order to allow the gas to expand during warm temperatures. Like for example, a 500 gallon tank, at a reading of 80% at normal temperatures reflects around 400 gallons of propane in the tank. This is roughly how much can be stored.

Normal Temperatures
The web site Propane 101, which is operated by the propane industry, considers an exterior temperature of 60 degrees to be the baseline or reference point. For example, if the gauge reads 50 percent of capacity on a day when the temperature is close to 60 degrees, then a 500 gallon tank will have approximately 250 gallons of propane. If the temperature that day is much lower than 60 degrees, the gauge would read lower. In the same way, if the temperature is a lot higher than 60 degrees, the gauge will actually read higher because the gas expanded.

Effect of Expansion and Contraction
The amount of energy contained or energy contained within a tank would not change when the gas either expands or contracts, based on the propane industry website. 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 would receive about 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 will be correct if the temperatures were close to 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.