but by mid-may , the sun , rises out of the morning 's haze with authority and potency , and standing on your top step at seven in the morning with your dinner bucket in your hand , you know that the dew will be melted off the grass by eight and that the dust on the back roads will hang depthless and still in the air for five minutes after a car 's passage ; and that by one in the afternoon it will be up to ninety-five on the third floor of the mill and the sweat will roll off your arms like oil and stick your shirt to your back in a widening patch and it might as well be july .