Countdown for the barbecue

So on next Saturday Amy and I are hosting a barbecue here at home. Barbecues are fun, but they tend to be very susceptible to weather variations. So, just because I'm a scientist, I decided to start a countdown with the weather forecast from multiple sources and see how they vary as we get closer to the date.

Today, May 25, 12:40 AM: Mostly cloudy, low 55˚F, high 72˚F, precipitation chance 10% Rain, low 49˚F, high 64˚F

Each source is a little different in the way they provide weather. Some only have a 7-day forecast, so I'll try to keep adding them as they enter the range. I'll just hope that is more correct than accuweather.