So if hardness before PWHT is within that normal range (240 HB) and no cracks presents, the weld is acceptable to me.
in other words the weld was not really quenched. if it was quenched the hadness will be much higher.
the hardness after PWHT would be less than 220 HB for this material if I am not ...

still if hardness is in normal range before PWHT it will not change my approch. it means the heating machines preformed well and kept a slow cooling. (thats the whole purpose) and the quenching hadn't happened in serious way.
( taking hardness of a P-22 weld before PWHT will reveal what?)
we do the ...

I would say that a welder will not continue welding in rain. and sure he stopped and covered the weld.
and since pre-heating machines are attached the harm would be much less.
I would check the hardness and if it is withen normal range, carry an RT or a UT to insure no cracks. and if the joint ok ...