GREEN BAY, Wis. -- When training camp opened on July 26, the high temperature in Green Bay reached 86 degrees. It was the same high on Aug. 30, the day of the last training camp practice.

In between, there were 11 other 80-plus degree days, three with highs in the 70s and one in the 60s on days the Green Bay Packers held camp practices, according to AccuWeather.

So perhaps Sunday's regular-season opener at Jacksonville won't be a climatic shock to the Packers' system.

"This is going to be hot; we understand that," Packers coach Mike McCarthy said Tuesday. "But the comparables of our summer versus the summer in Jacksonville, we laid it out for our players today. Our nutritionist, Adam Korzun, went through a presentation, and the fact of the matter is it's been six degrees warmer there than what we trained in the past five weeks for our training camp."

"So we've been training in an environment that's similar to what we're getting ready to go into but at the same breath we have to make sure we take care of the hydration. The way we're going about the schedule this week is all done with the focus on making sure our players are rested and hydrated going into this contest."

According to AccuWeather, the high temperature on Sunday in Jacksonville will be 94 degrees.

McCarthy couldn't have asked for a better start to the preparation on Tuesday, when rain forced him to move practice inside the Don Hutson Center, where, without the air conditioning on, it was warm and humid.

"I think we kind of got fortunate today being inside in the heat of the day today," receiver Jordy Nelson said after Tuesday's practice. "We talked about it a little bit, just knowing that you need to hydrate. But that's not different than any other game, any game in the South. Playing down in Miami a couple years ago was the same way. So, I think we got fortunate with a camp that was somewhat warm, especially for Wisconsin weather. I think we'll be fine. It will be the same."

It was just a coincidence that there were four pallets loaded with cases of bottled water outside the Packers' locker room on Tuesday; it was just the regular weekly shipment. But it served as the perfect reminder for the players as they came in from practice.

"A lot of guys were sweating a lot, myself included," quarterback Aaron Rodgers said. "We've got to replenish our fluids now, and it was probably a good test for the game this weekend. It's going to be hot and humid, but we'll be ready to play. We've been practicing in some decent humidity this preseason."

The two warmest games of the McCarthy era both came at Miami; it was 86 degrees at kickoff for both the 2006 and 2014 games there. The Packers won them both.

"That Miami game two years ago was pretty tough," defensive tackle Mike Daniels said. "I've played in extremely hot games before, I've played in extremely cold games before. You approach them all the same and that's just what do I have to do this week to make sure I'm the best I can."

The Packers plan to leave a little earlier than usual in order to get in a workout in the Florida heat on Saturday. Instead of flying out at midday, their plane departs at 8 a.m.

"I would say we're better prepared this year than the last two Miami experiences," McCarthy said. "The last one was tough. My memory of the first one was even tougher, we had some injuries in that game."