function get_temperature($part, &$metarPtr, &$group, &$wxInfo) {
	// Decodes temperature and dew point information. Relative humidity is calculated. Also,
	// depending on the temperature, Heat Index or Wind Chill Temperature is calculated.
	// Format is tt/dd where tt = temperature and dd = dew point temperature. All units are
	// in Celsius. A 'M' preceeding the tt or dd indicates a negative temperature. Some
	// stations do not report dew point, so the format is tt/ or tt/XX.

	function get_heat_index($tempF, $rh, &$wxInfo) {
		// Calculate Heat Index based on temperature in F and relative humidity (65 = 65%)
		if ($tempF > 79 && $rh > 39) {
			$hiF = -42.379 + 2.04901523 * $tempF + 10.14333127 * $rh - 0.22475541 * $tempF * $rh;
			$hiF += -0.00683783 * pow($tempF, 2) - 0.05481717 * pow($rh, 2);
			$hiF += 0.00122874 * pow($tempF, 2) * $rh + 0.00085282 * $tempF * pow($rh, 2);
			$hiF += -0.00000199 * pow($tempF, 2) * pow($rh, 2);
			$hiF = round($hiF);
			$hiC = round(($hiF - 32) / 1.8);
			$wxInfo['HEAT INDEX'] = "$hiF°F ($hiC°C)";
			}
		}

	function get_wind_chill($tempF, &$wxInfo) {
		// Calculate Wind Chill Temperature based on temperature in F and
		// wind speed in miles per hour
		if ($tempF < 51 && $wxInfo['WIND'] != 'calm') {
			$pieces = explode(' ', $wxInfo['WIND']);
			$windspeed = (integer) $pieces[2];   // wind speed must be in miles per hour
			if ($windspeed > 3) {
				$chillF = 35.74 + 0.6215 * $tempF - 35.75 * pow($windspeed, 0.16) + 0.4275 * $tempF * pow($windspeed, 0.16);
				$chillF = round($chillF);
				$chillC = round(($chillF - 32) / 1.8);
				$wxInfo['WIND CHILL'] = "$chillF&deg;F ($chillC&deg;C)";
				}
			}
		}

	if (ereg('^(M?[0-9]{2})/(M?[0-9]{2}|[X]{2})?$',$part,$pieces)) {
		$tempC = (integer) strtr($pieces[1], 'M', '-');
		$tempF = round(1.8 * $tempC + 32);
		$wxInfo['TEMP'] = "$tempF&deg;F ($tempC&deg;C)";
		get_wind_chill($tempF, $wxInfo);
		if (strlen($pieces[2]) != 0 && $pieces[2] != 'XX') {
			$dewC = (integer) strtr($pieces[2], 'M', '-');
			$dewF = round(1.8 * $dewC + 32);
			$wxInfo['DEWPT'] = "$dewF&deg;F ($dewC&deg;C)";
			$rh = round(100 * pow((112 - (0.1 * $tempC) + $dewC) / (112 + (0.9 * $tempC)), 8));
			$wxInfo['HUMIDITY'] = $rh . '%';
			get_heat_index($tempF, $rh, $wxInfo);
			}
		$metarPtr++;
		$group++;
		}
	else {
		$group++;
		}
	}