2017 Long Range Weather Forecast for Alton, IL


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How to Read Long-Range Weather Forecasts

Long-range predictions show weather trends in temperatures and precipitation. For example, will the winter be colder or warmer than average? Will there be more or less snow than what's typical for your area?  Our famous predictions (traditionally 80% accurate) are made 18 months in advance, and meant to help you make more informed decisions for long-term planning.

Here on Almanac.com, we provide free long-range forecasts for the next 30 to 60 days covering U.S. and Canadian regions. Find all 12 months of predictions in the annual Old Farmer's Almanac.

Free 2-Month Weather Forecast

JULY 2017: temperature 76° (1° below avg.); precipitation 6" (2" above avg.); Jul 1-4: Sunny, turning hot; Jul 5-11: A few t-storms, turning cool; Jul 12-15: Sunny, warm; Jul 16-23: T-storms, then sunny, cool; Jul 24-31: A few t-storms, cool.

AUGUST 2017: temperature 74° (1° below avg.); precipitation 3" (2" below avg. north, 1" above south); Aug 1-4: Showers, cool; Aug 5-13: Sunny, hot; Aug 14-19: T-storms, turning cool; Aug 20-23: Sunny, warm; Aug 24-29: T-storms, then sunny, cool; Aug 30-31: T-storms, warm.

Annual Weather Summary: November 2016 to October 2017

Winter will be milder and drier than normal, with near- to above-normal snowfall. The coldest periods will be in early to mid- and mid- to late January and early February. The snowiest periods will be in mid- to late November, mid-January, and early February.

April and May will be warmer and drier than normal.

Summer will be cooler than normal, with the hottest periods in mid- to late June, early July, and early to mid-August. Rainfall will be below normal in the north and above normal in the south.

September and October will be slightly cooler and rainier than normal.

Map showing Old Farmer's Almanac long range weather region number 10

About the Heartland Region

The Heartland long range weather region includes all or part of the following states: ILLINOIS (Alton, Galesburg, Moline, Quincy, Rock Island), IOWA (Cedar Rapids, Davenport, Des Moines, Sioux City, Waterloo), KANSAS (Kansas City, Olathe, Overland Park, Topeka, Wichita), MISSOURI (Columbia, Independence, Kansas City, Saint Louis, Springfield), NEBRASKA (Bellevue, Fremont, Grand Island, Lincoln, Omaha), SOUTH DAKOTA (Canton, Lennox, North Sioux City, Vermillion, Yankton), WISCONSIN (Baraboo, Fitchburg, Madison, Middleton, Monroe).

Heartland Neighboring Regions

Here are the regions that neighbor the Heartland long range weather region:

Temperature and Precipitation November 2016 to October 2017

Temperature and Precipitation Graph