You will need
• Pencil, piece of paper in the box, the table data of wind direction from any meteorite.
Instruction
1
Start compiling a wind rose is with the coordinate axes. In this case, however, they are not 2, as usual, and 8: on all sides and combinations. From the center of coordinates need to put the axis in all directions horizontally, vertically and diagonally at an angle of 45 degrees. Sign axis as Yu (South), (North), W (West), (East), and SE (Southeast), SW (southwest), NW (Northwest) and SW (North-East). Now you can start to build roses.
2
Write the number of observations of wind over a certain period in a certain area, for example, 20 days in Moscow. These data are easy to take on any weather website. The results should look like: 1st day of observation – the direction of NW, 2nd NW, 3rd–, etc. until the last day of measurements. The easiest way to write data in two-line table.
3
Group results for the wind directions. For example, it appears that for 20 days, wind direction North-West (NW) in Moscow was 7 days, West (H) – 4 days, etc. Should be 8 digits on the number of directions, some of which may be 0 if the wind direction during the selected period was never. The sum of all digits should be equal to the number of days of measurements. Check - if not, you then thought wrong.
4
Now start the build. To do this, select and label on each axis a single cut. Now for each axis need to postpone counted the number of days the wind of the given direction, for example SW – 3, th – 5 units., etc. After all the points for 8 axes postponed, simply connect them by line segments to obtain a closed polygonal contour. The resulting ratnabali flower with sharp beams will be similar to the rose – this is rose of the winds for a given location over a selected period. It should be noted that each region has a typical monthly and seasonal wind roses, which largely characterize the climate of the area.