65 degrees seems like a reasonable cutoff, though wind conditions should be factored in as well. On both May 25 and May 31 it looked as though the "sun" seats were toasty warm, while the "shade" seats were quite chilly, and the wind played a big part of that both days. (Another factor, as noted elsewhere in this thread, is the number of people who wear tank tops/shorts/sandals to games when the weather is just not warm enough to support a summer outfit.) After a history of learning experiences in County Stadium, we now take the approach of dressing for at least 15 degrees cooler than it is in Madison at the time we leave. We check the NWS conditions in Milwaukee (temperature, wind direction and wind speed). So we are often overdressed for the car ride over, but once we're in the park we're fine. Just as with County, even the parking lot conditions are often different than those inside the park. I wrote to the Brewers once, in the early years of MP, about how they make the roof decisions. I have the reply at home and will try to remember to post it once I am there. I think they put the cutoff at 60 degrees then, and my question was asked in the context of night games. And to keep this sort-of on the topic of the lead post...I think I'd rather not see curtains. This is easier for me to say since we rarely have third-base-side seats.