Weather Normalization Adjustments FAQ's

This means that it was approved only for a limited time. The WNA was approved for UGI Utilities by the Pennsylvania Public Utility Commission (PUC) in 2022 as a five-year preliminary trial. During this time, UGI will file reports with the PUC on how the WNA operates so that the pilot can be assessed to determine if it should continue. No later than January 31, 2026, UGI may request a continuation or modification of the WNA. Any continuation or modification of the WNA would have to be approved by the PUC.  Otherwise, the pilot will end on November 1, 2027.

Yes. There are other natural gas utilities in Pennsylvania that also have WNAs in place.

WNA is applied to all Pennsylvania Natural Gas Residential and Non-Residential customers served by UGI under Rate Schedules R (General Service Residential), RT (General Service Residential Transportation), N (General Service Non-Residential) and NT (General Service Non-Residential Transportation). For bills issued on and after November 1, 2025, Weather Normalization Adjustments are not applied to bills of customers who participate in the UGI Customer Assistance Program.

Yes. UGI continues to encourage customers to conserve energy whenever they can. Customers will see benefits from energy conservation in three ways.

  1. Customers who conserve energy will have lower charges for the cost of the actual gas used. These are called commodity charges, and they are not impacted by WNA.
  2. When a customer conserves gas during winter months (such as lowering the set temperature on their thermostat), their overall distribution charge will be less because less gas was delivered by UGI.
  3. In a month when WNA charge is assessed, if a customer lowers their heating usage for the billing period, their WNA charge will be less than it would have been with higher heating usage.

Recognizing that climate change may impact this calculation, the 15-year normal average will be updated on a rolling five-year basis. As climate impacts affect temperature, the normal base for any adjustment will follow those impacts and self-correct. The most recent update of the NHDD became effective on October 1, 2025, and will update every five years thereafter.

Normal weather is based on 15 years of temperature data from the National Oceanic and Atmospheric Administration (NOAA) weather stations in the UGI service area.  UGI uses average historic temperature data to estimate how much heating customers typically need on an average day. These are called Normal Heating Degree Days (NHDD). UGI uses NHDD numbers to set rates and calculate Weather Normalization Adjustments.

No. Customers served under Rate Schedules R, RT, N, and NT are subject to WNA under the terms of the pilot and do not currently have an option to opt out of participation. Weather Normalization Adjustments are not applied to bills of customers who participate in the UGI Customer Assistance Program.

Weather is measured in units called Heating Degree Days (HDDs). Heating Degree Days measure how much lower the normal and actual average daily temperatures were than 65°F, the point where heat is needed for most.

  • When Actual Heating Degree Days are more than Normal Heating Degree Days, the weather was colder than normal.
  • When Actual Heating Degree Days are less than Normal Heating Degree Days, the weather was warmer than normal.

Actual Heating Degree Days are calculated by taking 65°F (the temperature above which most people don’t need heating) and subtracting the average temperature for that day. For example, an average daily temperature of 45°F would equal 20 Heating Degree Days. An average daily temperature of 75°F would equal 0 Heating Degree Days.

For more detail on how the WNA operates, customers should refer to Rider C – Weather Normalization Adjustment within the Tariff for UGI Utilities, Inc. – Gas Division – PA P.U.C. NO. 7.  Download UGI Natural Gas Tariffs here.

No, WNA is calculated for each individual customer separately based on a customer’s bill period dates, actual usage, base load usage (non-heat usage), and weather.  This means that two next door neighbors may have different WNA amounts on their bills. Customers can visit the Weather Normalization Adjustment page to learn more about the calculation.

Effective November 1, 2025, WNA will only be applied to bills issued for natural gas service provided between October 1st and April 30th.

WNA is not applied to customer bills when weather is not 3% warmer or colder than normal because weather conditions didn’t significantly change how much energy was needed for heat. This 3% range is used to account for small fluctuations in weather and broaden what is considered normal weather by adjusting the Normal Heating Degree Days. The Actual Heating Degree Days are compared to this range to determine if WNA is applied to the bill.

  • If the Actual Heating Degree Days are within the range, WNA is not applied because the weather was close to normal.
  • If the Actual Heating Degree Days are higher than the range, a WNA credit is applied to the bill, because it was colder than normal.
  • If the Actual Heating Degree Days fall below the range, a WNA charge is applied to the bill, because it was warmer than normal.

Customers can visit the Weather Normalization Adjustment page to learn more about the calculation.