Flight connection duration in Frankfurt/Munich airport

Ouch. Isn't there anyway you can do this with just one connection? I figure each airline connection is a chance for something to go wrong.
You will not have to get your luggage and go through customs until you reach Florence, but you will have to go through Schengen immigration and get your entry stamp in your passport in Frankfurt.

There are 5 to 6 Lufthansa flights a day from Frankfurt to Florence, can you explain to me why you couldn't connect to Florence from Frankfurt, instead of making an additional stop in Munich?
I fly to Florence yearly, nearly always with Lufthansa (LH) via FRA or MUC. SFO has non stop flights to either German hub, so either way I have only one layover. MUC is the most efficient airport I know. I can usually make the connection in 20 minutes. I see no reason to believe it will take you longer in MUC, especially considering that you will have already done passport control in FRA (customs is at your last destination, therefore you won't see your checked luggage until you get to FLR).
FRA is bigger, and you will do passport control (immigration) there, since it's your first port of entry to the EU/Schengen area. FRA is now more efficient however. The new set up of the airport is now different and very clever. Your LH will arrive at the intercontinental (out of Schengen) gates in the area Z. The Z gates are on the upper floor. The LH Schengen flights (basically the EU domestic flights) are at the same terminal gates, but downstairs (A gates). So basically to go from your arrival gate (a Z gate) to the European flight gates, you basically just need to go one floor below (A gates). You will go through passport control before movingly to the lower floor. The gates may be in the exact same terminal and maybe next to each other or even the same. The only difference is that LH (or their partner UA) out of Schengen flights to North America board upstairs (Z gates) while EU flights (Schengen) board from the lower level (A gates), but same terminal. Since the distance from International to Schengen area is now likely short (just move from upstairs Z gates to downstairs A gates) it doesn't take as long as before, when you had to walk a long distance.

Be sure to use the right terminology. Customs is for goods; if you are all on one ticket, you do not go through this until your last airport. And, it is usually a matter of walking through the "Green Channel - Nothing to Declare" line; unless you are "randomly selected for additional screening" (possible but rare), you're done.

Immigration (passport control) is what takes time. Going from the US to Italy, you go through this on your first entry into the Schengen Zone. If your route is Seattle to Frankfurt to Munich to Florence, you will do this in Frankfurt. I've made tight connections in Frankfurt for the reason Roberto mentions (the gates are close together), but of course that's not a guarantee; I'd want at least 90 minutes for this.

I'm not sure why we US residents use the term "customs" to mean immigration, but we do; however, it does confuse Europeans. I was just changing in Dublin and ran into a traveler who had asked about "customs" for her connection and told there was none (since Dublin was not her final destination on her ticket), only to be confused when she had to go through immigration (since her final destination was Edinburgh, and Ireland and the UK have a common travel area).

I had never flown through Munich until last year on my way to Venice. My travel agent booked the flights and I had an hour to make the connection. I trusted she knew what she was doing. Couldn't have been more wrong. I have never seen anything so inefficient in my life. The only reason I made my flight is because I can run pretty fast, and the plane was late leaving for other reasons. It was a short walk to get to the security screening area, but when I got there I was shocked. It was a large room packed with people, no lines marked out, and absolutely no staff helping to guide people or speed things up. I wasn't even sure I was in the right place! This experience was probable even worse than trying to navigate Heathrow airport! I would never travel through Munich again without at least two hours. One of the other people in my tour group had a similar experience at Frankfurt.

is one hour enough time to make Frankfurt/Munich connection?

You will go through immigration in Frankfurt and one hour can be tight depending on the immigration line and where your gate is located. I've had several one hour transfers at Frankfurt in the last few years and never missed a connection but they have all been very tight and any hiccup would have made me miss a flight.

I will also be making a flight connection in Munich airport from Lufthansa airline to Air Dolomiti for Florence. I would like to find out if 1 hour is enough time to make that connection.

Since this is all on Lufthansa (Air Dolomiti is part of the Lufthansa group) your entire journey will be in Terminal 2 and one hour is more than enough. Munich is consistently rated one of the best airports in Europe and the world by Skytrax and most of this is due to the efficiency of terminal 2. Whenever you hear complaints about Munich it is typically because of connections in terminal 1 which fortunately you will not have to experience.

DJ

Roberto,

Thanks for your feedback, flying into Munich is because I wanted to spend a night in Munich and see the Christmas market.

Then you are not making a connection there. You have a one day stop over, correct?

Roberto, I intent to make connection from Munich to Florence on the same day, I will be spending a day in Munich on the return bound. The other option I can consider is take the City Night Line from Munich to Florence. I priced out economy sleeper with wash basin for 2 passengers is 240 Euro, it will cost almost 400 Euro if I fly into Florence and stayed in hotel. The train options gives me more relaxed connection time a few hours to see the city and better off cost wise, what do you think?