Wind Rose Data for Portland Jetport
- based on NWS Observations
1951-1980
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
Percentage of Wind Direction and
Speed by Month
DIRECTION
N 13.3 11.9 11.4 8.7 6.2 5.1 4.7 6.4 7.6 10.0 11.3 14.4 9.2
NNE 6.7 7.2 6.5 5.0 3.6 3.0 2.0 2.8 3.9 4.8 5.7 6.0 4.8
NE 3.1 3.7 4.5 3.8 3.8 3.4 2.2 2.6 3.0 3.3 3.1 3.0 3.3
ENE 1.1 2.2 3.5 3.5 4.3 3.6 2.5 2.6 2.8 2.6 2.0 0.9 2.6
E 0.9 1.9 4.2 4.8 6.5 5.8 4.4 3.8 3.4 3.6 2.2 1.0 3.5
ESE 0.8 1.6 2.7 4.0 4.9 4.3 3.5 3.1 2.6 2.5 2.0 0.9 2.8
SE 1.0 1.4 2.4 3.0 3.0 3.3 2.7 2.5 2.4 2.3 1.5 0.9 2.2
SSE 1.3 2.1 2.6 4.7 5.8 5.7 6.4 5.2 4.7 3.2 2.3 1.2 3.8
S 2.4 3.8 5.1 10.1 12.2 13.8 14.5 13.2 12.2 7.8 5.8 2.9 8.7
SSW 4.1 4.3 4.0 5.3 7.3 8.6 9.3 8.8 8.4 6.5 5.1 5.3 6.4
SW 8.7 6.1 4.7 5.4 5.7 6.8 7.7 7.7 7.8 8.1 8.9 10.0 7.3
WSW 9.8 8.6 7.0 6.3 6.0 6.4 7.9 6.8 7.5 8.0 9.0 10.1 7.8
W 10.4 10.1 9.9 7.7 7.1 7.0 8.1 8.0 7.8 8.4 10.8 9.8 8.7
WNW 9.8 10.1 9.5 9.1 6.7 6.4 6.8 7.0 6.2 7.0 8.5 9.4 8.0
NW 11.7 11.6 10.8 8.4 7.8 6.8 6.5 7.3 7.5 8.1 8.6 9.8 8.7
NNW 10.3 8.5 7.8 6.1 5.1 4.0 3.9 4.7 5.6 7.1 7.6 8.6 6.6
CALM 4.4 4.8 4.0 4.0 4.1 6.0 6.9 7.6 6.7 6.4 5.6 5.8 5.5
Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual
SPEED (MPH)
1 - 3 6.4 6.6 5.6 5.6 6.5 8.0 9.5 9.8 9.1 8.7 7.4 7.6 7.6
4 - 8 28.3 27.8 23.8 24.4 27.3 32.0 33.9 35.3 33.7 30.4 29.9 29.6 29.7
9 - 12 31.3 30.6 31.7 32.9 33.6 32.8 33.4 32.0 32.1 31.9 31.7 30.9 32.1
13 - 18 22.8 22.7 26.1 26.5 24.3 19.0 15.1 14.1 16.2 18.4 19.8 20.2 20.4
19 - 24 5.0 5.4 6.6 5.0 3.5 1.9 1.0 1.1 1.9 3.1 4.2 4.3 3.6
25 - 31 1.4 1.8 1.8 1.4 0.7 0.2 0.1 0.1 0.3 0.8 1.1 1.3 0.9
32 - 38 0.3 0.3 0.3 0.2 0.1 0.1 0.2 0.3 0.1
39 - 46 0.1
47 +
 

 
 

created 2/01
by ES