# WindChill

## Resumen

Identifies dangerous winter conditions that, depending on exposure times to the elements, can result in frostbite or hypothermia.

## Debate

The formula the function uses to compute wind chill is as follows:

``Wind Chill = 35.74 + (0.6215 * T) - (35.75 * WS^0.16) + (0.4275 * T * WS^0.16)``
• T = Air Temperature in degrees Fahrenheit
• WS = Wind speed in miles per hour

For more information about how this function works, see the Wind Chill raster function.

The referenced raster dataset for the raster object is temporary. To make it permanent, you can call the raster object's save method.

## Sintaxis

`WindChill (temperature_raster, wind_speed_raster, {temperature_units}, {wind_speed_units}, {wind_chill_units})`
 Parámetro Explicación Tipo de datos temperature_raster[temperature_raster,...] Un ráster de una única banda en el que los valores de píxeles representan la temperatura ambiente del aire. Raster wind_speed_raster[wind_speed_raster,...] A single-band raster where pixel values represent wind speed. Raster temperature_units La unidad de medida asociada al ráster de temperatura de entrada. Las unidades de entrada disponibles son Celsius, Fahrenheit y Kelvin.(El valor predeterminado es Fahrenheit) String wind_speed_units Defines the unit of measurement for the wind-speed raster: mph—Miles per hourkm/h—Kilometers per hourm/s—Meters per secondft/s—Feet per secondkn—Knots(El valor predeterminado es mph) String wind_chill_units La unidad de medida asociada al ráster de salida. Las unidades de salida disponibles son Celsius, Fahrenheit y Kelvin.(El valor predeterminado es Fahrenheit) String
Valor de retorno
 Tipo de datos Explicación Raster The output raster.

## Muestra de código

WindChill example 1

Calculates wind chill based on the temperature and wind speed from the input raster.

``````from arcpy.sa import *
out_windchill_raster = WindChill("temperature.tif", "windspeed.tif", "",
"km/h", "Celsius")
out_windchill_raster.save("C:/arcpyExamples/outputs/wind_chill_C.tif")``````
WindChill example 2

Calculates wind chill based on the temperature and wind speed from the input raster.

``````# Import system modules
import arcpy
from arcpy.sa import *

# Set the analysis environments
arcpy.env.workspace = "C:/arcpyExamples/data"

# Set the local variables
in_temperature_raster = "temperature.tif"
in_wind_speed_raster  = "windspeed.tif"

# Execute WindChill function
out_windchill_raster = WindChill(in_temperature_raster, in_wind_speed_raster,
"", "knots", "Kelvin")
# Save the output
out_windchill_raster.save("C:/arcpyExamples/outputs/wind_chill_K.tif")``````