2019 Long Range Weather Forecast for O'Fallon, IL

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Get the Long Range Weather for Your Location

See long range weather forecasts for the next 60 days from The Old Farmer’s Almanac! Our long range forecasts can be used to make more informed decisions about future plans that depend on the weather, from vacations and weddings to sporting events and outdoor activities.

To see long term forecasts for the entire year, pick up a copy of The 2019 Old Farmer’s Almanac, available online and in stores.

Note: Long range forecasts are regional, not city-specific.

Free 2-Month Weather Forecast

February 2019 Long Range Weather Forecast for Heartland
DatesWeather Conditions
Feb 1-6Flurries, then sunny, mild
Feb 7-13Rain arriving, mild
Feb 14-18Rain to snow, then sunny, cold
Feb 19-24Sunny, turning warm
Feb 25-28Showers, mild
Februarytemperature 38° (7° above avg.)
precipitation 1.5" (avg.)

March 2019 Long Range Weather Forecast for Heartland
DatesWeather Conditions
Mar 1-4Rainy periods, mild
Mar 5-14Rain and snow showers, cool
Mar 15-17Snowy, cold
Mar 18-20Sunny, mild
Mar 21-26Rain, then sunny, warm
Mar 27-31Rain, then sunny, cool
Marchtemperature 43° (1° below avg.)
precipitation 3" (0.5" above avg.)

Annual Weather Summary
November 2018 to October 2019

Winter will be milder than normal, with above-normal precipitation. The coldest periods will be in mid- and late December and early January. Snowfall will be below normal in the north and above normal in central and southern areas, with the snowiest periods in late November, mid-December, early January, and mid-March. April and May will be warmer and rainier than normal. Summer will be cooler than normal, with the hottest periods in late June and the first half of July. Rainfall will be below normal in the north and above normal in the south. September and October will bring near-normal temperatures and precipitation.

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 2018 to October 2019

Temperature and Precipitation Chart, November 2018 to October 2019 for O'Fallon, IL

Reader Comments

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Winter temps

I work out in the cold & this part of KC has been colder than normal since late October. The prediction for "colder temps" is correct to a degree but our February is twice as cold as any December we've ever had plus more precipitation than we've had since at least 2009. My prediction is a wet, wet year....worried about planting season now.

Weather

What is weather for midwest in April and May?
Really more Rainier than normal??? What's normal?

Forecast 8/31/19 and 9/7/19 in 66209 zip code

Planning an outdoor party.

Bipolar

One week were in tee shirt weather and the next in 10 layers of clothing lol.

Couldn't be more wrong

How is this a mild winter? Seems we're having the coldest temperatures ever here in the midwest. It's colder in the midwest than it is in Alaska! School has been cancelled for 6 days so far.

yikes

oof, bitter much? not much you can do about the weather, but survive it.

I think it’s been pretty mild

I think it’s been pretty mild with the exception of this polar vortex. At least here in NW Iowa. Ppl seem to forget what doesn’t help their Argument. Climate change is also starting to drastically change weather cycles... and the predictions will have to be figured out depending on them.

Weather Predictions 2019

According to the handy little chart provided by the Farmer's Almanac, we in the Midwest can expect cooler than normal temperatures in the hottest part of summer this coming spring. I have to keep myself contained as I'm already dreaming of fresh lettuce and spinach for my salad in July; and that NEVER happens. Yes, I know, "they" say never say never; but I'm telling you NEVER, not in Kansas. I so want to believe that I could have a growing season in which I don't have to start the lettuce and spinach in cold frames and hope against all hope that I have found the miraculous row covers that will protect my salad greens from bolting through June and maybe even until July 4th! I'd like to know how these predictions are made, using what data and their past accuracy? I can't very well scrap the cold frames, plan for succession planting, and revise my seed orders until I've gotten this information.

clarification

What do you mean by this sentence: "we in the Midwest can expect cooler than normal temperatures in the hottest part of summer this coming spring"?

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