A/C stops blowing cold when it's raining

"Rainy" air contains more water, which is harder to cool, so your system may no longer be able to keep up with the cooling requirements during wet weather. Your accident maybe have damaged some of your AC components—my suspicion would be you have a refrigerant leak. I would recommend having the system vacuum-tested to confirm that it actually holds pressure.

High humidity can condense then freeze on the evaporator coils more readily than dry air. This blocks the air flow . To avoid this keep fan on high with all vents open. Possibly, from the accident, there is some distortion to a vent that restricts air flow, to or from the coils.