// For each Weather in the list, sum the values
for (Weather i : list) {
	sumHumidity = sumHumidity + i.getHumidity();
	sumSpeed = sumSpeed + i.getWind();
	sumTemp = sumTemp + i.getTemperature();
	sumPressure = sumPressure + i.getPressure();
	sumVisibility = sumVisibility + i.getVisibility();
}