function _weather_format_relative_humidity in Weather 5

Same name and namespace in other branches

1. 5.6 weather.module \_weather_format_relative_humidity()
2. 6.5 weather.module \_weather_format_relative_humidity()

Calculate the relative humidity

The function uses celsius as input

1 call to _weather_format_relative_humidity()

theme_weather in ./weather.module

Custom theme function for the weather block output

File

./weather.module, line 833

Display <acronym title="METeorological Aerodrome Report">METAR</acronym> weather data from anywhere in the world

Code

function _weather_format_relative_humidity($temperature, $dewpoint) {
  if (!isset($dewpoint)) {
    return t('No data');
  }
  $e = 6.11 * pow(10, 7.5 * $dewpoint['celsius'] / (237.7 + $dewpoint['celsius']));
  $es = 6.11 * pow(10, 7.5 * $temperature['celsius'] / (237.7 + $temperature['celsius']));
  return max(0, min(100, round(100 * ($e / $es), 0))) . "%";
}