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Does Cold Actually Affect a Propane Tank Level Gauge?
Similar to nearly all 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 tank. Normally, this happens whenever a homeowner checks the gauge in cold conditions and sees the amount of the tank level before and after delivery. Depending on the weather conditions, the level on the tank may not go up as much as expected.

Propane Tank Level Gauge
The gauge on a propane tank shows you what percentage of the tank is full. Usually, tanks are not filled more than 80% so as to enable the gas to expand on hot days. Like for instance, a 500 gallon tank, at a reading of 80% at normal temperatures reflects approximately 400 gallons of propane inside the tank. This is about the amount which is able to 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 baseline or reference point. For instance, if the gauge reads 50 percent 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 same day is a lot lower than 60 degrees, the gauge will read lower. Also, 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
Based on the information provided by the propane industry website, the amount of energy contained within the tank does not really change as the gas contracts or expands. The amount of propane itself has not changed, but only the density of the gas has changed.

Cold-Weather Delivery
If a homeowner orders 100 gallons of propane to be delivered, they will be given 424 pounds 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 will be accurate if the temperatures were close to 60 degrees at the time of delivery. If the delivery happened during colder weather conditions, these chillier temperatures will cause a smaller increase reading on the propane gauge.

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