What is degree day calculation?
Degree day calculation is a method that measures the difference between outdoor temperatures and a baseline (usually 65°F) to estimate heating fuel demand and inform propane delivery schedules.
Propane suppliers in Florida use degree day calculations to forecast customer heating fuel needs based on actual weather conditions. The calculation compares daily outdoor temperatures to a reference point, typically 65°F, and totals the accumulated temperature deficit over time. For each day the average temperature falls below 65°F, the difference is counted as one heating degree day, or HDD. This running tally helps suppliers predict consumption patterns across their service areas.
Since most Florida homes use propane for water heating, pool heating, or backup appliances rather than primary space heating, degree day data remains useful for estimating hot water demand during cooler months. Suppliers track this metric to determine when customers are likely to need refills, allowing them to schedule automatic delivery services more efficiently. Seasonal temperature swings, though modest compared to northern states, still produce measurable variations that affect propane usage.
Accurate degree day tracking prevents supply gaps during brief cold snaps and helps suppliers manage tank inventory across their Florida territory. The calculation relies on historical weather records and current forecasts, making it a standard tool for customer communication about delivery timing. Understanding how your supplier uses this metric clarifies why delivery schedules may shift month to month.