Western Regional Climate Center
Wind Rose
GREAT FALLS AP, MT. WIND ROSE.
HOURLY WIND STATISTICS FOR THE PERIOD 920101-961231
DAYS OF THE YEAR USED : 0101 - 0131
TIME - TIME OF DAY (L.S.T.)
SPEED - AVERAGE (SCALAR) SPEED IN MPH
U-VEL - EAST-WEST VELOCITY, POSITIVE TO EAST
V-VEL - NORTH-SOUTH VELOCITY, POSITIVE TO NORTH
RESSPD - VECTOR AVERAGE (RESULTANT) SPEED IN MPH
RESDIR - VECTOR AVERAGE (RESULTANT) DIRECTION
DIRCON - DIRECTIONAL CONSTANCY (RESSPD/SPEED)
NUMSPD - NUMBER OF SPEED OBSERVATIONS
NUMDIR - NUMBER OF DIRECTION OBSERVATIONS
TIME SPEED U-VEL V-VEL RESSPD RESDIR DIRCON NUMSPD NUMDIR
---- ----- ----- ----- ------ ------ ------ ------ ------
0 11.9 6.2 6.1 8.6 225. 0.725 143 143
1 12.0 6.4 6.1 8.8 226. 0.737 140 140
2 12.4 6.5 7.0 9.5 223. 0.766 139 139
3 12.2 6.7 6.7 9.5 225. 0.777 139 139
4 12.2 6.7 6.3 9.2 227. 0.749 139 139
5 12.0 6.6 6.1 9.0 227. 0.752 134 134
6 11.9 6.4 5.9 8.7 227. 0.733 137 137
7 12.1 6.4 6.2 8.9 226. 0.738 133 133
8 12.3 6.5 6.3 9.0 226. 0.736 134 134
9 11.8 6.3 5.9 8.7 227. 0.734 129 129
10 12.2 6.7 6.3 9.2 226. 0.753 127 127
11 13.5 8.0 6.8 10.5 230. 0.775 128 128
12 13.9 8.3 6.9 10.8 230. 0.775 127 127
13 14.4 8.9 6.8 11.2 233. 0.779 129 129
14 14.7 9.0 6.0 10.8 236. 0.736 129 129
15 13.5 7.4 5.6 9.3 233. 0.690 130 130
16 12.6 6.5 5.2 8.3 232. 0.656 130 130
17 12.3 5.5 5.3 7.7 226. 0.623 135 135
18 12.3 5.9 6.2 8.5 224. 0.691 139 139
19 12.1 5.6 5.9 8.1 223. 0.674 138 138
20 12.0 5.8 6.1 8.4 224. 0.698 141 141
21 11.9 5.9 5.6 8.1 227. 0.686 139 139
22 11.8 5.6 5.8 8.1 224. 0.683 141 141
23 12.1 6.1 5.9 8.4 226. 0.697 142 142
ALL 12.5 6.6 6.1 9.0 227. 0.723 3242 3242
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GREAT FALLS AP, MT. WIND ROSE.
WIND ROSE. PERCENTAGE OF TIME WIND IS IN INDICATED
SPEED/DIRECTION CATEGORY. "SPEED" IS THE
AVERAGE SPEED WHEN WIND IS FROM THAT DIRECTION.
HOURS USED FOR WIND ROSE ("1" - USED, "0" - NOT USED) :
0 6 12 18 23 (L.S.T.)
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TOTAL NUMBER OF OBSERVATIONS USED : 3242
Overall period of data : 920101 - 961231
Date window : 0101 - 0131
SPEED CATEGORY (MPH) ALL AVE
DIR 0- 5 6-10 11-15 16-20 21-25 26-30 31-35 36-40 40 + SPEEDS SPEED
---- ----- ----- ----- ----- ----- ----- ----- ----- ----- ----- -----
N 7.2 2.0 1.2 0.3 0.0 0.0 0.0 0.0 0.0 10.7 3.8
NNE 0.5 0.8 0.1 0.0 0.0 0.0 0.0 0.0 0.0 1.4 6.9
NE 0.3 1.7 0.1 0.0 0.0 0.0 0.0 0.0 0.0 2.1 7.6
ENE 0.6 1.6 0.5 0.0 0.0 0.0 0.0 0.0 0.0 2.6 7.9
E 2.2 2.2 0.1 0.0 0.0 0.0 0.0 0.0 0.0 4.6 5.9
ESE 0.7 1.0 0.0 0.0 0.0 0.0 0.0 0.0 0.0 1.7 5.6
SE 0.4 0.4 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.7 5.8
SSE 0.4 0.3 0.0 0.0 0.0 0.0 0.0 0.0 0.0 0.8 5.6
S 0.6 2.3 0.9 0.3 0.1 0.0 0.0 0.0 0.0 4.1 9.6
SSW 0.6 3.0 4.5 3.7 2.0 0.4 0.2 0.0 0.0 14.4 14.9
SW 0.6 5.5 7.8 7.8 9.7 2.9 0.7 0.1 0.0 35.2 17.6
WSW 1.0 2.8 1.5 1.7 1.4 0.4 0.2 0.1 0.0 9.0 14.1
W 1.2 2.1 0.5 0.2 0.5 0.1 0.0 0.0 0.0 4.5 9.7
WNW 0.6 1.1 0.2 0.1 0.0 0.0 0.0 0.0 0.0 2.0 7.1
NW 0.8 1.3 0.5 0.2 0.1 0.0 0.0 0.0 0.0 2.8 8.6
NNW 0.7 1.0 1.0 0.4 0.1 0.0 0.0 0.0 0.0 3.4 10.4
ALL 18.4 29.1 19.0 14.8 13.8 3.8 1.1 0.2 0.0 100.0 12.5
For more information, contact
Western Regional Climate Center,
email: wrcc@dri.edu
phone: 775-674-7010
fax: 775-674-7016