Masonite pre hung doors sticking hot weather
Warmer air can hold higher amounts of moisture, so although you are in a fairly dry climate, I think the increase in temperature increased the humidity content, causing the doors to expand.
At this point, you have two options: either remove the trim (if installed) and adjust the jambs to provide an adequat gap, or remove the door from its hinges and modify it to fit. If adjust a Masonite door itself, I will use either a power plane if the amount to be removed is small (or a very sharp smoothing plane), or a Festool saw/guide setup to remove larger amounts from the whole edge/top/bottom.
Either method will accomplish the same thing - an adequate gap - and the one you choose is simply a function of how comfortable and equipped you are to do both procedures.
As the poster indicated above, the doors should be primed on all 6 surfaces, so if you elect to work the door, prime the machined surfaces afterwards.