# Wind Rose and Polar Bar Charts in Python

How to graph wind rose charts in python. Wind Rose charts display wind speed and direction of a given location.

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### Wind Rose Chart with Plotly Express¶

A wind rose chart (also known as a polar bar chart) is a graphical tool used to visualize how wind speed and direction are typically distributed at a given location. You can use the px.bar_polar function from Plotly Express as below, otherwise use go.Barpolar as explained in the next section.

Plotly Express is the easy-to-use, high-level interface to Plotly, which operates on a variety of types of data and produces easy-to-style figures.

In [1]:
import plotly.express as px
df = px.data.wind()
fig = px.bar_polar(df, r="frequency", theta="direction",
color="strength", template="plotly_dark",
color_discrete_sequence= px.colors.sequential.Plasma_r)
fig.show()


#### Basic Wind Rose Chart¶

In [2]:
import plotly.graph_objects as go

fig = go.Figure()

r=[77.5, 72.5, 70.0, 45.0, 22.5, 42.5, 40.0, 62.5],
name='11-14 m/s',
marker_color='rgb(106,81,163)'
))
r=[57.5, 50.0, 45.0, 35.0, 20.0, 22.5, 37.5, 55.0],
name='8-11 m/s',
marker_color='rgb(158,154,200)'
))
r=[40.0, 30.0, 30.0, 35.0, 7.5, 7.5, 32.5, 40.0],
name='5-8 m/s',
marker_color='rgb(203,201,226)'
))
r=[20.0, 7.5, 15.0, 22.5, 2.5, 2.5, 12.5, 22.5],
name='< 5 m/s',
marker_color='rgb(242,240,247)'
))

fig.update_traces(text=['North', 'N-E', 'East', 'S-E', 'South', 'S-W', 'West', 'N-W'])
fig.update_layout(
title='Wind Speed Distribution in Laurel, NE',
font_size=16,
legend_font_size=16,
polar_angularaxis_rotation=90,

)
fig.show()


#### Reference¶

See function reference for px.(bar_polar) or https://plotly.com/python/reference/barpolar/ for more information and chart attribute options!

Dash is an open-source framework for building analytical applications, with no Javascript required, and it is tightly integrated with the Plotly graphing library.

Learn about how to install Dash at https://dash.plot.ly/installation.

Everywhere in this page that you see fig.show(), you can display the same figure in a Dash application by passing it to the figure argument of the Graph component from the built-in dash_core_components package like this:

import plotly.graph_objects as go # or plotly.express as px
fig = go.Figure() # or any Plotly Express function e.g. px.bar(...)
# fig.update_layout( ... )

import dash
import dash_core_components as dcc
import dash_html_components as html

app = dash.Dash()
app.layout = html.Div([
dcc.Graph(figure=fig)
])