Does Cold Actually Affect the Level Gauge on a Propane Tank?
Propane is like 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 inside the tank is reflected by the gauge which reflects the tank level. Often, this occurs whenever a homeowner checks the gauge during cold weather and sees the amount of the tank level before and after delivery. Depending on the climate, the level on the tank might not go up 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 warm temperatures. Like for instance, a 500 gallon tank, at a reading of 80% at normal temperatures reflects approximately 400 gallons of propane in the tank. This is about the amount which is able to be stored.

Normal Temperatures
The propane industry operates the popular website Propane 101, that considers the propane baseline 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 close to 60 degrees, then a 500 gallon tank will contain approximately 250 gallons of propane. If the temperature that day is much lower than 60 degrees, the gauge will read lower. Similarly, if the temperature is much higher than 60 degrees, the gauge would actually read higher due to the expansion of the gas.

Effect of Contraction and Expansion
According to the information provided by the propane industry website, the amount of energy contained within the tank does not really 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 receive roughly 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 near 60 degrees at the time of delivery. If the delivery took place during colder weather conditions, these chillier temperatures will result in a smaller increase reading on the propane gauge.