Russell Temperature scale

rtemp.coffee

http = require 'http'

kelvinToRussell = (kelvin) ->
  kelvin = +kelvin
  temps = [0, 273.15, 310.15, 373.15]
  for i in [0...temps.length - 1]
    if kelvin < temps[i + 1]
      return i + (kelvin - temps[i]) / (temps[i + 1] - temps[i])
  return 3 + (1 - 373.15 / kelvin)

http.get 'http://api.openweathermap.org/data/2.5/weather?q=Boston,ma', (res) ->
  data = ""
  res.on 'data', (d) ->
    data += d
  res.on 'end', ->
    data = JSON.parse data
    kelvin = data.main.temp
    console.log kelvinToRussell kelvin