Does Cold Affect a Propane Tank Level Gauge?
Propane is similar to nearly all other types of materials in that it is affected by cold temperatures. The propane gas contracts when the temperature declines. That reduced level of gas in the tank is reflected by the gauge which reflects the tank level. Often, this comes into play whenever a homeowner checks the gauge during cold climate and sees the amount of the tank level before and after delivery. Depending on the conditions, the tank level might not rise as much as anticipated.

Propane Tank Level Gauge
The gauge on the propane tank will show what percentage of the gas tank is still full. Tanks are usually not filled more than 80% full because this will allow for the gas to expand on warmer temperatures. For instance, a 500 gallon tank, at a reading of 80% at normal temperatures reflects roughly 400 gallons of propane in the tank. This is roughly how much can be stored.

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

Effect of Contraction and Expansion
Based on the information provided by the propane industry website, the amount of energy contained inside the tank does not actually change as the gas expands or contracts. 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 could expect the guage to go up by 10%. These numbers will be accurate if the temperatures were near 60 degrees at the time of delivery. If the delivery happened during colder weather, these chillier temperatures will cause a smaller increase reading on the propane gauge.