Weird problems on warm days
 

I have a 90 420 SEL, and now that it is getting warmer in LA area I have been noticing a lot of weird issues.
When it was cooler around the 60-low 80's it ran good with a slight rough idle, but no big deal.
Now that the last few days have been higher 80's and some places 90's I am finding that my AC is not cold at all, and starting takes a few seconds. Meaning I have to hold it and let it crank for a few seconds whereas on colder days it would just start with a flick of the key.

Does anyone know why temperature changes outside would do this? Seems odd.