Dictionary term
Cooling Degree Day
Direct answer
Cooling Degree Day: A Cooling Degree Day is a temperature-demand index accumulated when a day mean temperature exceeds a selected base.
Cooling Degree Days estimate warm-weather cooling demand above a base temperature.
Cooling Degree Days estimate warm-weather cooling demand above a base temperature.
A Sun–Earth orientation for seasonal, atmospheric, tidal, and terrestrial terms.Quick reference
- Use when
- Use Cooling Degree Day with the base temperature, averaging method, station, and time interval identified.
- Do not use it for
- Do not infer heat-health risk or indoor conditions from cooling degree days alone; humidity, nighttime minima, vulnerability, and building design differ.
- Reference category
- Seasons & Earth Almanac
- Related terms
- Heating Degree Day, Frost Date, Astronomical Season, Equinox
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The story behind Cooling Degree Day
Energy analysts paired cooling and heating degree days as climate-sensitive planning metrics.
Cooling Degree Day in spiritual tradition
Spiritually, cooling degree days can guide stewardship of energy while keeping human safety central.
Cooling Degree Day: fact and faith, kept distinct
This is a factual calendar, astronomy, Earth-science, cultural-history, or observational reference. It can support wonder and practical planning without becoming a claim of fate, spiritual causation, or private revelation.
Cooling Degree Day in numerology
Cooling Degree Day is not a numerology claim. Any numbers attached to it should retain their ordinary scientific, calendrical, navigational, or historical meaning unless a separate symbolic interpretation is clearly labeled.
Why Cooling Degree Day matters
They help compare hot seasons, plan electricity capacity, and normalize air-conditioning demand.
Cooling Degree Day at work: an example
With a 65-degree-Fahrenheit base, a daily mean of 80 contributes 15 Cooling Degree Days under the simple method.
Where interpretation stops
Cooling Degree Day is presented as sourced astronomy, calendrical, Earth-science, cultural, or instrument-history reference. Definitions should distinguish measured phenomena from civil convention and historical interpretation, preserve location and time dependencies, and avoid turning factual sky data into a deterministic personal claim.
Sources and editorial method
Research references used for this entry include:
- NOAA NCEI: U.S. Climate Normals - Official methodology and data for climate normals, degree days, growing seasons, and freeze dates.
- Source
- The Great Almanac Dictionary
- Category
- Seasons & Earth Almanac
- Also appears in
- Seasons & Earth Almanac
- Aliases
- None listed
- Last updated
- 2026-07-16
Track accumulated cooling demand
Cooling Degree Day in a book is one thing; Cooling Degree Day in your own birth chart is your life. The Oracle casts your real chart and tells you what it means for your love, your work, and your year ahead, in conversation, free.
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More in Seasons & Earth Almanac
- Earth-Sun Distance Cycle
- Growing Degree Day
- Mixed Tide
- Perigean Spring Tide
- September Equinox
- Sun Pillar
- 22-Degree Halo
- Belt of Venus
Common questions
What is Cooling Degree Day?
A Cooling Degree Day is a temperature-demand index accumulated when a day mean temperature exceeds a selected base.
How is Cooling Degree Day used in an almanac?
Use Cooling Degree Day with the base temperature, averaging method, station, and time interval identified.
What should I avoid when interpreting Cooling Degree Day?
Do not infer heat-health risk or indoor conditions from cooling degree days alone; humidity, nighttime minima, vulnerability, and building design differ.
