Does Cold Really Affect the Level Gauge on a Propane Tank?
Similar to most other types of materials, propane is affected by cold temperatures. As the temperature declines, the propane gas contracts. That reduced level of gas in the tank is reflected by the gauge that reflects the level on the propane tank. Normally, this occurs whenever a homeowner checks the gauge during cold weather and sees the amount of the tank level before and after delivery. Depending upon the conditions, the tank level might not go up as much as expected.

Propane Tank Level Gauge
The gauge on the propane tank will show what fraction of the gas tank is still full. Tanks are typically not filled more than 80% full as this would allow for the gas to expand on hotter temperatures. Like for instance, a 500 gallon tank, at a reading of 80 percent at normal temperatures reflects around 400 gallons of propane inside the tank. This is roughly the amount that is able to be stored.

Normal Temperatures
The propane industry manages the popular website Propane 101, that considers the propane reference point to be an exterior temperature of 60 degrees. Like for example, if the gauge reads 50% of capacity on a day when the temperature is near 60 degrees, then a 500 gallon tank would have around 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 much higher than 60 degrees, the gauge would actually read higher since the gas expanded.

Effect of Expansion and Contraction
The amount of energy contained or energy contained in 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 just the density of the gas has changed.

Cold-Weather Delivery
If a homeowner orders 100 gallons of propane to be delivered, they would receive 424 lbs. of propane. If the homeowner has a 1000 gallon propane tank, they may expect the gauge to go up by 10% with the delivery of 100 gallons. 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 conditions, these chillier temperatures would cause a smaller increase reading on the propane gauge.