Canonical Definition
Weather normalization is an analytical adjustment of energy usage or revenue data to remove the effects of abnormal weather, typically using degree days, so that consumption can be compared against typical weather conditions. Utilities use it in load forecasting, rate cases, and efficiency program evaluation; some gas utilities also apply weather normalization adjustment mechanisms to bills or rates, where approved by regulators. Methods and applications vary by utility and state.
Explanations
Weather normalization is a math adjustment. It shows what your energy use would have been with typical weather. Very hot or cold spells drive heating and cooling use up. It helps tell real changes in habits or gear apart from weather swings. Utilities use it for forecasts and program reviews. Some also use related tweaks in rates, with regulator approval. Practices vary by utility and state.
Weather normalization is a math trick. It asks how much energy you would have used with normal weather. It helps show whether your use really changed, or just the weather did.
Analogy Bank
Weather normalization is like grading on a curve for weather — it asks how your usage would have scored in a typical season.
It's like adjusting a runner's time for wind: the correction reveals the real performance underneath the conditions.
Do Not Say
- ✕Do not present weather-normalized figures as actual billed usage; they are analytical adjustments.
- ✕Do not state whether a customer's utility applies a normalization mechanism to bills or rates; practices vary by utility and state.