Year * Month * Day * Data is available up to November 19, 2020. Get the monthly weather forecast for Des Moines, IA, including daily high/low, historical averages, to help you plan ahead. Snowfall totals for December 2018 were about 8 to 10 inches below normal. Based on weather reports collected during 1985–2015. The average annual temperature in Iowa ranges from 45 degrees Fahrenheit (° F) in the extreme north to 52 in the southeastern corner of the State.In July, the hottest month, daily temperatures range from morning lows of around 61 and afternoon highs of 82° F in the northeast corner of the State up to lows of 65 and highs of 87 in the southwest. This month is known as a … December is a dry month with an average of 26mm (1.0in) rain. Averages are for Waterloo Municipal Airport, which is 5 miles from Waterloo. Weather.com brings you the most accurate monthly weather forecast for with average/record and high/low temperatures, precipitation and more. Low Temperature Overnight in December the average temperature drops below freezing at 17.5°F, with the lowest temperature of -22.0°F being recorded on December 23, 1989. Precipitation totals for December 2018 were about a quarter inch to three quarters of an inch below normal. The climate maps below are courtesy of the Midwest Regional Climate … Much of the southern third of Iowa had highs above 50 degrees, supported by southerly winds and clear skies. The snowiest periods will be in mid-November, early to mid-December, and mid-February. See Historical Weather Data for a Location and Date. through the 27th with the average statewide temperature eight degrees above average. Station Data. Please see Dec Records for monthly record information. Precipitation will be below normal, with snowfall below normal in most places. KTIV Television 2929 Signal Hill Drive Sioux City, IA 51108 Switchboard: 712-239-4100 or 800-234-KTIV (5848) Email: ktivnews@ktiv.com Weather History for Places in Iowa . December 18th was the warmest day of the month; the statewide average high was 49 degrees, 18 degrees above the 30-year climatological average. The hottest day on record was December 28, 1984 when the temperature recorded was 69.1°F. ... IA Monthly Weather. Des Moines, IA daily average and extreme temperature range for December. Winter temperatures will be well above normal, on average, with the coldest periods in mid-December, from late December into early January, and in late February. Monthly: 1981-2010 normals The average minimum temperature (usually the minimum temperature is noted during the night) in Ames in December is -8.0°C (17.6°F). Monthly averages Des Moines Longitude: -93.6091, Latitude: 41.6005 Average weather Des Moines, IA - 50347. 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