select the beginning of the observation 19961997199819992000200120022003 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 123456 789101112 131415161718 192021222324 252627282930 31 select the end of the observation: 19961997199819992000200120022003 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec 123456 789101112 131415161718 192021222324 252627282930 31 select an interval of averaging 1 minute (raw data) 15 minute average 30 minute average 1 hour average 3 hour average 6 hour average 12 hour average 24 hour average required for averaged data: select a type of averaging centered average forward average required for plots: select a variable Vel_E Vel_N wind vector wind speed (1) wind speed (2) pressure relative humidity air temperature short wave radiation or