|Description / Units
|Date and time at end of observation
|Observation hour count
|Observation version number - Use the row with '1', as this has been quality checked by the Met Office
|Unique source identifier or station site number
|State indicator for the record**
|Campbell-Stokes sunshine duration
|Concrete state code gives the state of a concrete slab (e.g. dry, wet, frozen, etc) of specified standard dimensions and composition at the observing station.
|Lying snow flag. Snow lying is counted, provided that the snow covers at least one-half of the ground easily visible from the station and the altitude of this ground does not differ by more than 30m from that of the station. In judging if at least one-half of the ground is snow covered no account is taken of bare patches under trees or of aeras occupied by water.
|Fresh snow amount
|Snow day code
|Hail day code - A day of hail is defined as one when pieces of ice, 5mm or more in diameter are observed to fall. The hailstones can fall separately or be agglomerated into irregular lumps.
|Thunder day flag - A day of thunder is counted when thunder is heard.
|Gale day flag - A day of gale is counted when a mean wind speed reaches or exceeds or is estimated to have reached or exceeded, 34kn (force 8 on the Beaufort scale) over a period of at least several minutes (10 mn in the case of a station equipped with an anemograph).
|Fresh mountain snowfall flag
|QC code - Campbell-Stokes sunshine duration**
|QC code - concrete state code**
|QC code - snow depth**
|QC code - fresh snow amount**
|QC code - snow day code**
|QC code - hail day code**
|QC code - thunder day flag**
|QC code - gale day flag**
|Met Office receipt stamp time
|Elapsed time to storage in MIDAS
|Derived 24HR Sunshine duration
These stations are those with radiation sensors only which use the global radiation values to derive a 24hr sunshine value. This was incorrectly appearing under WMO 24hr sunshine when the value was not coming from a sunshine sensor so was moved into the DRV_24HR_SUN_DUR column.
|QC Code - Derived 24HR sunshine duration
|height of lowest lying snow (in decametres). Please note that the observer could enter the height of the lowest lying snow at station level. In this case the station height has been rounded to the nearest 10 metres and used. Observations made as part of the Snow Survey of Great Britain (1946-2007).
|QC - Lying snow height
LYING_SNOW_HT_Q gives a flag for both null and non-null values. For a null value a 0 flag means that there was no snow observed, 120 means that the reading is missing and 130 means that no observation was possible due to the hills being obscured.
More information about the Met Office surface data is available in the documentation provided by the Met Office.