Virginia Cooperative Ext Master Gardener group just published this on their facebook page. I don't know if it will be of any help:
"Do you have green tomatoes left on the vine that don't seem to be ripening? The optimum temperature range for ripening mature green tomatoes is 68–77 F. The colder temperatures get, the slower the ripening process will be. And, when temperatures are outside the optimum range for extended periods, conditions may become so stressful that the ripening process virtually halts.
If you have green tomatoes that are still pretty firm and you don't expect the weather to warm back up, you can try picking them and ripening indoors using the newspaper method:
"Pick the tomatoes, wash them, and dry them. Wrap in newspapers, place in a box in a single layer and store in a cool place. Tomatoes should not be allowed to touch. Store the box in a cool dry place, such as an unheated basement or garage. Check the boxes regularly for signs of ripening, and remove those that are starting to change color so they can finish ripening on your counter top.
The flavor won’t be as good as those you picked that were already starting to change color, but they’re still WAY better than anything you can buy in the supermarket, and this method can yield tomatoes for several weeks."
Options for ripening tomatoes indoors:
https://lee.ces.ncsu.edu/.../how-to-ripen-green.../.. "