0 0 AVERAGE OF MAXIMUM AND MINIMUM VALUES: TM = (TX + TN)/2
1 1 AVERAGE OF THE 8 OBSERVATIONS TAKEN EVERY THREE HOURS
2 2 AVERAGE OF THE 24 HOURLY OBSERVATIONS
3 3 WEIGHTED AVERAGE OF 3 OBSERVATIONS: TM = (AT1 +BT2 + CT3)
4 4 WEIGHTED AVERAGE OF 3 OBSERVATIONS AND ALSO MAXIMUM AND MINIMUM VALUES: TM= (AT1 +BT2 + CT3 +DTX + ETN)
5 5 AUTOMATIC WEATHER STATION COMPLETE INTEGRATION FROM MINUTE DATA
6 6 AVERAGE OF THE 4 OBSERVATIONS TAKEN EVERY SIX HOURS
255 255 MISSING VALUE
