Original data / National Weather Service
72-hour heating outlook for nine cities.
How much heating do the next three days of official forecasts call for in each city we cover? This table reads the National Weather Service forecast when you open the page and applies the method below.
| City | Heating degree-hours (°F) | Coldest forecast | Forecast covered |
|---|---|---|---|
| Birmingham, AL | Reading forecast | - | - |
| Columbus, OH | Reading forecast | - | - |
| Dallas, TX | Reading forecast | - | - |
| Huntsville, AL | Reading forecast | - | - |
| Louisville, KY | Reading forecast | - | - |
| Memphis, TN | Reading forecast | - | - |
| Miami, FL | Reading forecast | - | - |
| Nashville, TN | Reading forecast | - | - |
| Phoenix, AZ | Reading forecast | - | - |
Reading the National Weather Service forecast.
Snapshots of these figures are also published as an open dataset (CC BY 4.0): GitHub and Kaggle.
How the numbers are made
The window starts when you open the page and ends 72 hours later. For every forecast period from the National Weather Service, the forecast temperature is held constant over the hours that fall inside the window. Heating degree-hours are the sum of the number of degrees Fahrenheit below 65 multiplied by those hours. A colder forecast gives a larger number. A city total is shown only when the forecast covers all 72 hours without overlap; otherwise it is marked not available.
What this does and does not show
Day and night forecast temperatures are generally highs and lows, so these are coarse period-based figures, not measured hourly values. The numbers describe forecast cold at one coordinate per city. They do not measure demand, energy use, equipment condition or provider availability, and cities are listed alphabetically, not ranked.
Sources
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