Introduction & principle
θ=(T+273.15)(1000/P)^0.2854, in kelvin. This dry Poisson approximation omits condensation and moisture effects; it is not equivalent potential temperature. Input temperature −100–60°C and pressure 100–1100 hPa.
All tools
Meteorological Calculation
Dry Potential Temperature
Compare dry-air temperatures after an idealized adiabatic adjustment to 1000 hPa.
Use this tool
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Worked example
20°C at 1000 hPa returns 293.15 K. At 800 hPa the dry potential temperature is higher than the input absolute temperature.
Detailed usage guide
- 1Enter air temperature in °C and pressure in hPa.
- 2Read θ in kelvin at the fixed 1000 hPa reference.
- 3Use it only for the dry idealization; do not treat it as a local surface forecast.
Common problems & FAQ
Is this equivalent potential temperature?
No. This is dry potential temperature. Equivalent potential temperature includes moisture and latent heat and requires another method.
Methods & references
Method reviewed November 4, 2026. These tools support learning and recording, not safety-critical decisions.