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METAR Information

As a method of checking the data from Kingsteignton Weather, I download the "Meteorological Services to Airmen Reports", or METARs, which are published regularly by the professionals at all airports. The nearest to Kingsteignton is Exeter International, located 23.6km to the north east, but I also download METARs from Plymouth airport, 39.7km to the west south west, and Royal Naval Air Station Yeovilton, 84.1km to the east north east.
Exeter Airport, 2010.07.30 0750 UTC
Sky conditions mostly clear_
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Weather conditions 9999 FEW025
Air pressure 30.00 in. Hg (1016 hPa)
Humidity 77%
Dew point 55 F
Temperature 17 C
Wind Calm
Visibility greater than 7 mile(s)
Plymouth / Roborough, 2010.07.30 0750 UTC
Sky conditions mostly clear_
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Weather conditions 9999 FEW020
Air pressure 30.03 in. Hg (1017 hPa)
Humidity 82%
Dew point 57 F
Temperature 17 C
Wind Calm
Visibility greater than 7 mile(s)
Yeovilton, 2010.07.30 0650 UTC
Sky conditions mostly cloudy_
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Weather conditions 9999 FEW025 BKN090
Air pressure 30.00 in. Hg (1016 hPa)
Humidity 76%
Dew point 51 F
Temperature 15 C
Wind S (190 degrees) at 3 MPH (3 KT):0 )
Visibility greater than 7 mile(s)

OK, the weather conditions part might be a little hard to understand, so here's an explanation:

  • The first 4 figure number is the visibility in metres. 4 zeros indicates that visibility is less than 50m, 4 nines means 10km or more. You will probably see "NDV" after this on the Yeovilton METAR. This means the observation has "No Directional Variation reporting capability" and is taken automatically rather than by eye.
  • Next there may be a weather condition description, but not always. For example, HZ means Haze, FG is Fog, RA is Rain, you get the idea.
  • Next is cloud information. FEW015 means few clouds at flight level 015, or 1500 feet. BKN250 means broken cloud at flight level 250, or 25,000 feet. There may well be more than one of these. "CAVOK" means Cloud And Visibility OK.
  • If there is anything you don't understand, this is a good link for an explanation.