The First Robin Of Spring

It is popular to herald the arrival of Spring upon sighting the first robin. It is three degrees outdoors , the ground is covered with snow, it is February 5th , and as I look out the window I spot a fat robin frolicking in the snow. Spring is here! Hardly, Spring will not arrive until March 21st. That robin and his friends have been shivering in Ohio like the rest of us . They are not "snow birds" who head for Florida at the first sign of cold weather. So how will I know when it is spring? When I see that robin hopping around with a worm in its beak.