Below is a good article from the Extension Office at Penn State. It discusses an increase in annual heavy precipitation events, resulting in the state become more drought "tolerant."
http://extension.psu.edu/natural-resources/water/news/2014/penn-state-webinar-asks-2013-is-pennsylvania-becoming-drought-resistant#.VGNsnanJhKs.twitter
Does this mean we no longer need to irrigate our lawns in PA? Absolutely not. Our most recent summers have include extended periods of no or little rain. The lawns have needed supplemental water to prevent dormancy. Once dormancy starts, a lot of water is need to bring the lawn out of dormancy. Also, when lawns become stressed, this is also the time weeds start popping up. The amount of fertilizers and pesticides required can be reduced with a healthy lawn.
Does this mean we do not have to minimize the amount of water we put on our lawns? Again, absolutely not! Water conservation is important. But, if you do not feel strongly about water conservation, over watering your lawn is still a bad idea. It promotes shallow root development and disease problems. Just like people, too much of a good thing is also bad for grass.
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