Some people are predicting a very cold winter. Trees are dropping leaves earlier than they have seen in many years. I grew up in SW Iowa and lived there for nearly 40 years before moving to Ohio for much of the same kind of winters and have lived in the Atlanta area for 20 years and about to move to Houston to live with my daughter and her family.
Early January in the past brought daytime temps below 32 degrees for a high, usually around 10. By the time March came around and the temp got up to 25 degrees then that was short sleeve weather. I couldn't handle it now. Now when we go back to visit relatives people say when are you moving back, I say NEVER. A little side story, I had a very good friend that retired from the AF when he was in SAC in Omaha and we asked where he was going to live. He said he was going to tie a snow shovel to the front bumper of his truck and the first place that he stopped and people asked him what it was that was where he was going to stay.
To answer your question you might just call around and check near Nashua, Charles City or further south around Waterloo. It's pretty cool there right now, only 54 degrees but will be warming up to the 80's next week. Nashua is pretty far north in Iowa and water supply will be the big issue. If you carry 100 gallons and don't need city water you may get by for a week or so. As long as your tanks are protected and kept warm it should be OK. You may want to put 100 watt bulbs lit in your basement areas to keep the chill off, you would be surprised how much heat they put off. We used to put them under the hood of the car next to the battery to get good current flow to the starter in below zero weather. The camp grounds may have water shut offs below the frost line that drain when they are shut off, that's what we had on the water hydrants on farm to fill the livestock water tanks and then a tank heater to keep the ice melted .
You might not want to overstay your welcome, HA. Good Luck!
2014 Palomino Puma 25RS 28 days in 2014, 47 days in 2015, 51 days in 2016 plus 6 more booked
2011 F-150 Supercrew 5.0 6spd, Me, Xyl and the 2 kids, BooBoo and Gracie (kittens)