Monthly mean zonal wind components ( 0.1 m/s) at Singapore (48698), 1N/104E 2021 hPa JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 10 -303 -298 12 -263 -260 15 -155 -170 20 11 9 25 71 81 30 72 65 35 47 69 40 47 73 45 41 71 50 53 82 60 35 54 70 24 34 80 19 -19 90 -16 -48 100 -171 -80