METAR is the Aviation Routine Weather Report and is more or less standard around the world. The temperatures are given in Celsius degrees. The atmospheric pressure however is reported in hecto pascals everywhere, but the US where the atmospheric pressure is reported in inches of mercury. For aviation purposes the standard temperature and atmospheric pressure are 59 F (15C) and 29.92 in. Hg (1013.2 hPa).

Below is a sample METAR: