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Pressure-Aware Wet and Ice Bulb

Calculate pressure-aware wet or ice bulb using station pressure and humidity, with separate phase solutions and clear near-freezing ambiguity.

Use this result well

Inputs that matter
Air temperature (°C), Relative humidity (%), Station pressure (hPa), Bulb phase, and 1 more
Output to expect
Pressure-aware wet or ice bulb
  • Check the units and required inputs before comparing results.
  • Keep the assumptions with a copied result so you can reproduce the calculation later.
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Reference & details

How it works

Pressure-aware wet or ice bulb

Solve the ASHRAE moist-air energy balance using dry-bulb temperature, relative humidity on the stated saturation basis and actual station pressure. This is a thermodynamic psychrometric calculation, not WBGT or a human-exposure threshold.

Convert e to humidity ratio 0.621945 e/(P−e), then solve the water/ice adiabatic-saturation balance for bulb temperature.

Updated: September 2026

Example Scenarios

Inspect the example and its input basis, then substitute your own documented measurements or matched cases.

Air temperature (°C): 30Relative humidity (%): 50Station pressure (hPa): 1013.25Bulb phase: auto

→ 22.00498°C wet-bulb temperature

Common Mistakes to Avoid

Mixing observation and model inputs

Use the exact units, timestamp, level and measurement or model basis stated by the selected mode. A similar quantity from another instrument or product is not automatically interchangeable.

Treating an illustrative case as a measurement

Replace the example with your own sourced inputs. Retain missing values and method limits, and keep raw source data alongside a saved calculation.

FAQ

Solve the ASHRAE moist-air energy balance using dry-bulb temperature, relative humidity on the stated saturation basis and actual station pressure. This is a thermodynamic psychrometric calculation, not WBGT or a human-exposure threshold.

Retain the station or profile identity, observation or issue/valid time, measurement units, quality flags, source and stated method. Missing values, trace precipitation and known zeros have different meanings.

Save weather case keeps an explicit local record. Copy MD includes current inputs and notes; Download CSV includes the current result breakdown. Keep portable copies separately and retain raw source data.

About Pressure-Aware Wet and Ice Bulb

Solve the ASHRAE moist-air energy balance using dry-bulb temperature, relative humidity on the stated saturation basis and actual station pressure. This is a thermodynamic psychrometric calculation, not WBGT or a human-exposure threshold.