Rain measuring simple unit with a measuring jar fitted with a funnel collect rain pouring. Here I presume the rain falling vertically down with zero speed. However, usually the wind is blowing. If it blows with higher speed, then naturally rain pours down not vertically, but at some angle. With more speed of wind, slanting of rain increases. In that case will this not affect the collected amount in measuring the rain? Or is there any correction one has to apply considering the wind speed and angle made by the rain with vertical line?