Rain is NOT under pressure. It falls by the force of gravity. Gravity is the only force acting on rain and rain can only fall. For instance rain can NOT go up but a shower head can spray water up because it is under pressure. Shower water is under pressure and rain IS NOT under pressure.
Also as to the question of my running, you be the judge. Here is my January workout calendar. Because of winter (no biking either) it is probably my 2ed lowest millage month of the year (Feb is usually a little lower).
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Wind also affects rain not just gravity.