What a ridiculous question to ask! Of course it has a bearing on the length of winter! Any fool can blindly see that the effect of the shadow on the ground affects the central nervous system of the groundhog, causing a chain reaction resulting in either six more weeks of winter or the end of life as we know it! Thankfully the latter only has a 0.000000000001% chance of happening.
But for those that get a chance to see the hidden world underground they would find a network of tubes, weather monitoring equipment, and groundhog meteorologists all working together for the good of all mankind by predicting the weather and guarding us from the dreaded doomsday device that is set to destroy us all in a cataclysmic whirlwind of nuclear devastation.
Clearly what I am saying is going over the heads of the simple-minded people of this fair planet Earth, however do not scoff at the tumultuous terror that is teetering to topple the delicate balance of nature and thermonuclear war!