feels

feels

Feels allow you to calculate apparent temperature using heat index, approximate wet-bulb globe temperature, humidex, australian apparent temperature and wind chill.

Combinations of this methods also named as Feels like, Real feel etc.

You can also calculate relative humidity, dew point, frost point, water vapour pressure using class or standalone methods.

Usage

npm install feels

var Feels = require('feels');

var config = {
  temp: 20,
  humidity: 85,
  speed: 20,
  units: {
    temp: 'c',
    speed: 'mps'
  }
};
console.log(Feels(config).like());

API

Class methods

Most of the class methods also available as standalone methods.

var Feels = require('feels');

console.log(Feels({temp: 20, humidity: 80.9}).toF().humidex());

Feels(options)

Params:

• options (Object) - Feels options:
  • temp (Float) - Temperature in Celsius, Fahrenheit or Kelvin, depends on units type.
  • humidity (Float) - Relative humidity in percent.
  • speed (Float) - Wind speed in meters per second, miles per hour or kilometers per hour, depends on units type.
  • dewPoint (Float) - Dew point in Celsius, Fahrenheit, Kelvin depends on units type.
  • units (Object) - Units type:
    • temp (String) - c, f, k (by default c).
    • speed (String) - mps, mph, kph (by default mps).

Feels().like([options])

If options aren't provided returns an index is calculated with ['HI', 'HI_CA', 'AAT', 'WCI'].

Params:

• options (String|Array) - String or array with one of the apparent temperature acronyms.

Acronyms

• HI - Heat index (Feels().heatIndex() or heatIndex()).
• AWBGT - Approximate wet-bulb globe temperature (Feels().AWBGT() or AWBGT()).
• HI_CA - Humidex (Feels().humidex() or humidex()).
• AAT - Australian apparent temperature (Feels().AAT() or AAT()).
• WCI - Wind chill (Feels().windChill() or windChill()).

If you want to convert temperature from one to other temperature scale, you can place .toC(), .toF() or .toK() before target method.

Feels(options).heatIndex()

Params:

• options (Object) - Options:
  • temp (Float)
  • humidity|dewPoint (Float)

Feels(options).AWBGT()

Params:

• options (Object) - Options:
  • temp (Float)
  • humidity|dewPoint (Float)

Feels(options).humidex()

Params:

• options (Object) - Options:
  • temp (Float)
  • humidity|dewPoint (Float)

Feels(options).AAT()

Params:

• options (Object) - Options:
  • temp (Float)
  • speed (Float)
  • humidity|dewPoint (Float)

Feels(options).windChill()

Params:

• options (Object) - Options:
  • temp (Float)
  • speed (Float)

Feels(options).getWVP()

Params:

• options (Object) - Options:
  • humidity (Float)
  • temp (Float)

Feels(options).getWVPbyDP()

Params:

• options (Object) - Options:
  • dewPoint (Float)

Feels(options).getARH()

Params:

• options (Object) - Options:
  • temp (Float)
  • dewPoint (Float)

Feels(options).getRH()

Params:

• options (Object) - Options:
  • temp (Float)
  • dewPoint (Float)

Feels(options).getADP()

Params:

• options (Object) - Options:
  • temp (Float)
  • humidity (Float)

Feels(options).getDP()

Params:

• options (Object) - Options:
  • temp (Float)
  • humidity (Float)

Feels(options).getFP()

Params:

• options (Object) - Options:
  • temp (Float)
  • humidity (Float)

Aliases

• toC() - toCelsius()
• toF() - toFahrenheit()
• toK() - toKelvin()
• getWVP() - getWaterVapourPressure()
• getWVPbyDP() - getWaterVapourPressureByDewPoint()
• getARH() - getAproximateRelativeHumidity()
• getRH() - getRelativeHumidity()
• getADP() - getAproximateDewPoint()
• getDP() - getDewPoint()
• getFP() - getFrostPoint()

Standalone methods

All standalone methods use temperature in Celsius, humidity in percent and wind speed in meters per second.

var humidex = require('feels').humidex;

console.log(humidex(20, 80.9));

Heat index

The heat index is an index that combines air temperature and relative humidity in an attempt to determine the human-perceived equivalent temperature. Wiki

Note: The heat index is used for temperatures more than 20 Celsius.

heatIndex(temp, humidity)

Params:

• temp (Float) - Temperature in Celsius.
• humidity (Integer) - Humidity in percent (from 0 to 100).

heatIndex(temp, dewPoint, true)

Params:

• temp (Float) - Temperature in Celsius.
• dewPoint (Float) - Dew point in Celsius.
• true (True) - Must be true for dew point usage.

Approximate WBGT

The approximate wet-bulb globe temperature is a composite temperature used to estimate the effect of temperature, humidity, wind speed on humans. Unlike WBGT, AWBGT not take into account radiation effect. Wiki

Note: The AWBGT is used for temperatures more than 15 Celsius.

AWBGT(temp, humidity)

Params:

• temp (Float) - Temperature in Celsius.
• humidity (Integer) - Humidity in percent (from 0 to 100).

AWBGT(temp, dewPoint, true)

Params:

• temp (Float) - Temperature in Celsius.
• dewPoint (Float) - Dew point in Celsius.
• true (True) - Must be true for dew point usage.

Humidex

The humidex is an index number used by Canadian meteorologists to describe how hot the weather feels to the average person, by combining the effect of heat and humidity. Wiki

Note: The humidex is used for temperatures more than 0 Celsius.

humidex(temp, humidity)

Params:

• temp (Float) - Temperature in Celsius.
• humidity (Integer) - Humidity in percent (from 0 to 100).

humidex(temp, dewPoint, true)

Params:

• temp (Float) - Temperature in Celsius.
• dewPoint (Float) - Dew point in Celsius.
• true (True) - Must be true for dew point usage.

Australian Apparent Temperature

The AAT is an index number used by the Australian Bureau of Meteorology to describe heat balance in the human body. Wiki

AAT(temp, speed, humidity)

Params:

• temp (Float) - Temperature in Celsius.
• speed (Float) - Speed in meters per second.
• humidity (Integer) - Humidity in percent (from 0 to 100).

AAT(temp, speed, dewPoint, true)

Params:

• temp (Float) - Temperature in Celsius.
• speed (Float) - Speed in meters per second.
• dewPoint (Float) - Dew point in Celsius.
• true (True) - Must be true for dew point usage.

Wind chill

Wind chill is the perceived decrease in air temperature felt by the body on exposed skin due to the flow of air. Wiki

Note: The humidex is used for temperatures less than 0 Celsius.

windChill(temp, speed)

Params:

• temp (Float) - Temperature in Celsius.
• speed (Float) - Speed in meters per second.

Water vapour pressure

getWVP(humidity, temp)

Params:

• humidity (Integer) - Humidity in percent (from 0 to 100).
• temp (Float) - Temperature in Celsius.

getWVPbyDP(dewPoint)

Params:

• dewPoint (Float) - Dew point in Celsius.

Approximate relative humidity

getARH(temp, dewPoint)

Params:

• temp (Float) - Temperature in Celsius.
• dewPoint (Float) - Dew point in Celsius.

Relative humidity

getRH(temp, WVP)

Params:

• temp (Float) - Temperature in Celsius.
• WVP (Float) - Water vapour pressure.

getRH(temp, dewPoint, true)

Params:

• temp (Float) - Temperature in Celsius.
• dewPoint (Float) - Dew point in Celsius.
• true (True) - Must be true for dew point usage.

Approximate dew point

getADP(temp, humidity)

Params:

• temp (Float) - Temperature in Celsius.
• humidity (Integer) - Humidity in percent (from 0 to 100).

Dew point

getDP(temp, humidity)

Params:

• temp (Float) - Temperature in Celsius.
• humidity (Integer) - Humidity in percent (from 0 to 100, except 0).

Frost point

getFP(temp, humidity)

Params:

• temp (Float) - Temperature in Celsius.
• humidity (Integer) - Humidity in percent (from 0 to 100, except 0).

License

The MIT License (MIT)
Copyright (c) 2015 Alexey Bystrov