Annual wind rose
The annual wind rose splits the wind into 16 directions and six speed bands (from 0–2.5 m/s to over 10 m/s, grouped from the Beaufort scale), and links each band to the outdoor activities it remains comfortable for, from long sitting to unsafe.
Daily wind rose
The daily wind rose shows the wind at four times of day for each season, which is often what matters for shading, natural ventilation and the use of terraces and courtyards.
From wind to design decisions
Projects on a paid plan add directional outdoor comfort strategies, which show comfort by wind direction and give windbreak guidance, and can overlay future climate scenarios on the annual wind rose.
See your site's climate before design begins
Pin any location and get climate, comfort and preliminary energy insight your whole team can read. Start with a 7-day free trial, or book a 30-minute demo.
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Frequently asked questions
What is a wind rose?
A circular chart that shows how often the wind blows from each direction and at what speeds. The longer a spoke, the more often the wind comes from that direction.
Where does the wind data come from?
From the nearest weather station's typical-year file and, in projects, from reanalysis data at the site's exact coordinates. You can compare both. Wind speeds are 10 m values. With weather station data they are each station's hourly observation: the mean of the 10 minutes before the observation, the WMO standard (US stations report a 2-minute mean). With site-specific data they are hourly reanalysis model values for a grid cell about 3 to 31 km wide. Neither is an hourly average, a gust or a design wind speed.
Can I see the wind by season?
Yes. The daily wind rose breaks the wind down by season and by time of day.
Learn the concepts
How to read a wind rose
Petals, frequency rings, speed bands and calms explained, with the checks and design uses that matter on a building project.
UTCI (Universal Thermal Climate Index)
What UTCI measures, its four inputs, the ten stress categories with their thresholds, its limits and how to use it in outdoor design.
Site climate analysis for architecture
A step-by-step method for the climate layer of an architectural site analysis: where to get the data, what to read, what to put on the sheet and how each finding becomes a design move.
Related features
Outdoor comfort (UTCI)
UTCI outdoor thermal comfort heatmaps by season and hour, and strategies for sun and wind exposure.
Sun path diagram
Sun path diagrams in 2D, 3D and globe views, together with monthly daytime cloud cover.
Site climate analysis
A full climate study for any location in the world, run in the browser from a single address or map pin.