This is a fairly large Sparrow and sexes are similar with females generally duller than males. The photos of 3 different birds below were all taken in my backyard on April 15th, 2015. You get an idea of the variation in plumage. Let's look at the first photo which shows a rather handsome WTSP. This adult bird shows the striking head pattern showing the broad white supercilium and the bright contrasting yellow supraloral. The white throat is surrounded by a gray face and chest.
This second photo is another adult bird but take a look at the plumage and compare it to the bird above. This bird shows less dark gray in the face and chest. What about the post-ocular stripe? It looks browner on this bird.
How about this bird? Look how this bird shows even less yellow in the supraloral compared to the two birds above. What about the stripes? Do you notice the striping on the breast that run towards the flnak. We don't see this with the first bird but we do see some of it on the second bird. There is another field mark on this bird that is common with WTSP number 2. Look at the throat on this bird, it shows thin malar stripes which we see on the second bird but not the first. When I observed these two birds in my backyard, I wondered if these were what are referred to as "tan-striped" WTSP. What do you think? Have you seen White-throated Sparrows like this on the East Coast that looks like this? Here is a tidbit on White-throated Sparrows. Do you know that both sexes may sing? Find a bird you think might be a female and see if it sings. The best time is early in the morning to watch them singing.
White-throated Sparrow, Backyard Birding, Queens, NYC