Monthly averages Cedar Rapids Longitude: -91.6656, Latitude: 41.9779 Average weather Cedar Rapids, IA - 52401. Des Moines's coldest month is January when the average temperature overnight is 11.7°F. Monthly: 1981-2010 normals Here are some average weather facts we collected from our historical climate data: During the month of May and September you are most likely to experience good weather with pleasant average temperatures that fall between 20 degrees Celsius (68°F) and 25 degrees Celsius (77°F). Average winter temperatures range from a high of 67.4 degrees Fahrenheit (19.7 degrees Celsius) in Hawaii to a low of 2.6 °F (-16.3 °C) in Alaska. On average, the warmest month(s) are July and August. Current weather in Iowa, with temperatures in 10 cities, including high and low temperatures for the country. Weather Highlights. The following maps are analyses of four inch depth soil temperatures. These maps are based on National Weather Service North American Mesoscale (NAM) forecast model analyses and short term forecasts. Evanston averages 35.9 inches of snow per year. Iowa City, Iowa Summer High: the July high is around 85.1 degrees Winter Low: the January low is 13.3 Rain: averages 36.9 inches of rain a year Snow: averages 26.8 inches of snow a year For the month, negative departures of three to six degrees were reported across the state with the coldest conditions found in northwestern Iowa. Please contact the FAA for more information on pilot briefings or call 1-800-WX-BRIEF (800-992-7433). Sign up for our email newsletter by entering your email address. In July, the warmest month, the average day time temperature rises to 86.0°F. Monthly averages Iowa City Longitude: -91.5481, Latitude: 41.6398 Average weather Iowa City, IA - 52246. Iowa City averages 26.8 inches of snow per year. Weather history for places in Iowa. Temperatures have only slowly crept up into the mid to upper 30s across Iowa. Iowa State Soil Moisture Network observations are used to bias correct the model output after some quality control checks are made. Temperatures. Weather Summary for Iowa National Weather Service Des Moines IA 1014 AM CST Sun Nov 29 2020 It has been a cool and breezy morning across the region, with partly cloudy skies and brisk northwest winds of 20 to 25 mph, gusting over 35 mph at times. October’s statewide average maximum temperature was 56.7 degrees, 5.7 degrees below normal while the average minimum temperature was 35.3 degrees, 3.9 degrees below normal. Station Data. The US average is 27.8 inches of snow per year. Monthly: 1981-2010 normals History: 2007-2019 The temperatures are state-wide averages calculated from temperatures recorded during the months of December, January and February. Station Data. These current conditions and the related content/links on this page are not a substitution for the official weather briefing from the FAA.