Tomatoes are very temperature dependent for setting fruit. It may be too hot or too cold, or maybe there aren't bees to pollinate. But I've heard of the temperature problem. I wonder if you could try taking a q-tip or small brush and doing some pollinating, just in case. I also read that watering too much can prevent them from producing fruit.

First off you don't need bees at all,period.
Try shaking the stems of your plants to help release pollen,or brush your hands across the flowers >
Humidity can be a factor also,as it clumps the pollen up.
Not all tomato plants are created equall,do not grow exactly the same.

Consider the DTM of each variety (Days To Maturity -- not from the time seeds are sown, but from the time you plant out):

Fourth of July -- 49 DTM
Bush Early Girl -- 65 DTM
Goliath -- 65-85 DTM (no consistency)
Momotaro -- 74 DTM
Pink Brandywine -- If this is Brandywine Sudduth, 85 DTM

Of course, those DTM numbers aren't written in stone -- just general guidelines (sometimes indicative of the seed- or plant-seller's ability to lie positive thinking).

So you see, your early varieties are the ones which have set fruit. You may think the plant is old enough to set fruit, but it may have a later DTM and not be ready yet. And of course, the weather was way weird.

This timeline shows about 50 days from when the blossom opens to a fruit's peak ripeness. So for the plants which haven't set fruit yet, count the days since you planted them, then add 50: how does that compare to the plant's DTM?
http://www.tomatosite.com/index.php?NT=Cultivation&RE=Truss_Timeline