This is a great site to know you local weather for US. Why? It also shows local info for your altitude and the current humidity and dew point and your exact atmospheric pressure.

All factors for what you might expect for A/C performance.

Just enter your zip code and like any watch out where you click on.

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Good general info but still suggest knowing air temps with vehicle's running what it is right in front of a condenser by a foot or so will dictate what pressures you will see,