Atmospheric Calculator

Calculate ISO 2533 Standard Atmosphere properties and ISO 5878 wind distributions — from −2,000 m to 80,000 m.

The International Standard Atmosphere (ISA) defines a reference vertical profile of temperature, pressure, density, and derived properties — used in aerospace engineering, meteorology, and scientific research worldwide.

ISO 2533

ISO 5878

Wind Components

V_x — Zonal wind (m/s)

V_y — Meridional wind (m/s)

σ_r — Std deviation (m/s)

Use |V_x| for V_r (zones > 20°N)

Presets (ISO 5878 data)

V_r Vector Mean4.08 m/s

V_sc Scalar Mean6.41 m/s

σ Component Std Dev4.17 m/s

Percentile Wind Speeds

Percentile	Speed (m/s)	Description
1st percentile	0.751	Exceeded on 99% of occasions
10th percentile	2.42	Exceeded on 90% of occasions
20th percentile	3.51	Exceeded on 80% of occasions
Scalar mean	6.41	Expected speed V_sc
80th percentile	9.12	Not exceeded on 80% of occasions
90th percentile	10.78	Not exceeded on 90% of occasions
99th percentile	14.88	Not exceeded on 99% of occasions

Rice Distribution

PDF (solid blue) and CDF (dashed green) of the Rice distribution for V_r = 4.08 m/s, σ_r = 5.90 m/s. Red dot marks V_sc. Dashed orange lines indicate percentile boundaries.

Wind distribution calculated using the circular normal (Rice) distribution per ISO 5878 Section 5.4. See the API docs for the computeWindDerived API.