Introduction & principle
T2=T1−Γ(h2−h1)/1000. Γ is the chosen decrease in °C per kilometre. A negative gradient models an inversion. This linear assumption excludes fronts, moisture, terrain and diurnal effects; it is not a hiking forecast.
All tools
Meteorological Calculation
Temperature Lapse-Rate Estimator
Apply an explicit temperature gradient between two heights without claiming a local forecast.
Use this tool
Preparing interactive controls…
Worked example
20°C at 100 m with a 6.5°C/km decrease gives 13.5°C at 1100 m. A −2°C/km gradient instead gives 22°C.
Detailed usage guide
- 1Enter the reference temperature and both heights in metres.
- 2Choose the assumed temperature decrease per kilometre; use a negative value for an inversion scenario.
- 3Read the modeled temperature and retain the assumption beside it. Use official forecasts for actual conditions.
Common problems & FAQ
Does the default gradient predict mountain weather?
No. The default 6.5°C/km is an illustrative standard-atmosphere gradient. Actual gradients can differ or reverse; choose an explicit scenario and use official forecasts for a real trip.
Methods & references
Method reviewed November 4, 2026. These tools support learning and recording, not safety-critical decisions.