Answer: The dry weather and high night-time temps could have affected pollination in the spring and early summer, so that the fruit you seen now began developing later in the summer than usual.
Here are a few tricks to help push those green tomatoes along! Remove a portion of the foliage. Don't remove too much, or you'll risk sunscald, but thin the plants to allow sun to penetrate and warm the fruit. Prune actively growing suckers and shoots, to direct energy toward the fruit. Root prune, by sinking a shovel into the ground in a circle around the plant, about a foot from the stem. By disturbing the roots in this way, you can sometimes stress the plants into ripening their fruit.
Bring any partially ripened fruit indoors and place in a warm spot to hasten ripening.
Q&A Library Searching Tips