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ABBREVIATED TABLE FOR CONVERTING BAROMETRIC PRESSURE
IN MILLIMETRES TO INCHES TO MILLIBARS
.
MMS
INS.
MBS
700
27.56
933
705
27.76
940
710
27.95
947
715
28.15
953
725
28.56
967
730
28.73
973
735
28.94
980
740
29.15
987
745
29.32
993
750
29.53
1000
755
29.74
1007
760
29.91
1013
765
30.12
1020
770
30.33
1027
775
30.50
1033
780
30.71
1040
785
30.92
1047
790
31.13
1053
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Notes
A) 1 millimetre is approximately equal to 0.04 inches and 1.35 millibars
B) An average deep winter depression would give pressure down to around 960-980 millibars while anti-cyclones ( good weather) would normally give values of around 1020-1040.