It is the wind of March that makes it seem much colder than it is.

March 12. 

Sleet, turning soon to considerable rain, - a rainy day. 

Thermometer about 40, yet it seems a warm rain to walk in, it being still, while yesterday, of the same temperature, with that raw northwest wind, was cold and blustering. 

It is the wind of March that makes it unpleasant often, and to seem much colder than it is. 

H. D. Thoreau, Journal, March 12, 1860

Sleet, turning soon to considerable rain. See December 14, 1859 ( "Snow-storms might be classified. .. . there is sleet, which is half snow, half rain."); January 27, 1855 ("Yesterday’s driving easterly snow-storm turned to sleet in the evening, and then to rain, and this morning it is clear and pretty cold"); February 27, 1857 (" Before I opened the window this cold morning, I heard the peep of a robin, that sound so often heard in cheerless or else rainy weather, so often heard first borne on the cutting March wind or through sleet or rain, as if its coming were premature.") See also A Book of the Seasons, by Henry Thoreau, Snow-storms might be classified

The wind of March makes it seems colder than it is. See March 11, 1860 ("It is cold and blustering walking in the wind, though the thermometer is at 40; i. e., though the temperature is thus high, the strong and blustering northwest winds of March make this notorious March weather, which is worse to bear than severe cold without wind."). See also March 4, 1860 ("The last three have been true March days for wind."); March 6, 1855 ("Still stronger wind, shaking the house, and rather cool. This the third day of wind."): March 8, 1860 ("Nowadays we separate the warmth of the sun from the cold of the wind and observe that the cold does not pervade all places, but being due to strong northwest winds, if we get into some sunny and sheltered nook where they do not penetrate, we quite forget how cold it is elsewhere."); March 9, 1860 ("You incline to walk now along the south side of hills which will shelter you from the blustering northwest and north winds."); March 10, 1856 ("A biting northwest wind compels to cover the ears. It is one of the hardest days of the year to bear. Truly a memorable 10th of March. ") and A Book of the Seasons, by Henry Thoreau, Signs of the Spring, March is famous for its winds