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Key to Meteorological Records

Measurements are taken daily at 09:00 GMT.

Column NameDefinition
PRESSURE barometric pressure, corrected for mean sea level and temperature. (mb)
DRY BULB dry bulb temperature (Celsius)
WET BULB wet bulb temperature (Celsius)
WIND DIRN wind direction (degrees East from North)
WIND SPEEDwind speed (knots)
TOTAL CLOUD synoptic cloud cover, estimated number of oktas (1/8 th of the sky) covered by clouds. A totally overcast sky is registered as 8 and a clear sky as 0 (Observers Handbook, 1982*).
VIS visibility from the weather station (kms)
PRESENT WEATHER description of the weather according to the Observers Handbook, 1982*.
STATE GRND description of the state of the ground according to the Observers Handbook, 1982*.
RAINFALL daily rainfall total (mm)
SUNSHINE daily sunshine hours total (hrs)
30cm Soil temperature at 30cm depth
100cm Soil temperature at 100cm depth
MAX. Maximum temperature (Celsius)
MIN. Minimum temperature (Celsius)
GRASS MIN. Minimum temperature (Celsius) at ground (grass) level.

*Observer's Handbook. 4th Ed., H.M.S.O., London, 1982, 220pp.

 
Abbreviations and codes used in the observer's diary

Instruments Used

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Last Revised: 2008October 23rd
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