Our Proprietary 10-Day Forecast

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Current warnings over Delavan, Illinois
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<p>Warnings from F5Weather</a></div>

United States weather warnings are issued by various organizations under NOAA. Most from the National Weather Service, but also Storm Prediction Center and National Hurricane Center.

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Current radar over Delavan, Illinois red dot
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<p>Live radar from F5Weather</a></div>

Our radar is based off of US NEXRAD and Canadian weather radar sites through the quality controlled MRMS system. It compiles various sources for radar data and filters out erroneous returns such as sun spikes and ground clutter. We then colorize the precipitation based on our methods for determining precipitation type. Rain is in shades of green, mixed precipitation and freezing rain in shades of pink and snow is in shades of blue.

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Current satellite over Delavan, Illinois red dot
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<p>Live satellite from F5Weather</a></div>

Our satellite is from the GOES-16. It is color enhanced by using a geocolor terrain background during the day and black marble city lights at night. The daytime satellite data is Visible satellite imagery, and nighttime uses Infrared bands. The bluish clouds are fog and low cloud. The whiteest clouds are the coldest, highest cloud tops.

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Current surface weather map around Tazewell County, IL

This surface map is from the HRRR computer model. It is a 1-hour forecast, updated hourly, which is a good estimate of the current surface conditions. This map shows the current high and low pressure centers, pressure isobar contours, wind streamlines and thickness contours. It also shows the currently depicted preciptiation estimates, although this should not be a substitute for actual live radar. The purple dashed contour is the 5400m thickness line, which is often a good proxy for the rain/snow line.

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Temperatures right now near Delavan, Illinois

This is the latest surface temperatures as depicted by the HRRR computer model, updated hourly. Although these are not actual observations, this model is a very good representation of current conditions as it factors in observations, terrain and physics to give you more detailed temperatures in areas that do not have reporting weather stations. For the latest reports at specific locations, like in Delavan, IL please see our current conditions data on the left and right side of this page, or go to our current conditions page.

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Surface wind speed map over Delavan, IL

This map shows the latest HRRR computer model winds. This depiction of the current wind directions and speeds is an estimate from the computer model. For actual observations in Delavan, IL, see the current conditions data on the left and right side of this page, or go to our current conditions page.

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Regional 24 hour rainfall expected near Delavan, Illinois

This is a forecast of the amount of precipitation expected over the next 24 hours from the HRRR weather forecast model. This is only one forecast depiction, and you should check other models to get a better idea of what may happen. You can view this and other models in more detail on our main weather forecast maps page. There, you will also be able to look at forecasts beyond just 24 hours and look at forecasts out to as far as 16 days.

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Area snowfall accumulation expected around Tazewell County, Illinois

This is snowfall forecast, with amounts anticipated in the next 24 hours. This guidance is from the HRRR weather model. For more model forecasts out to 16 days, visit our main weather forecast maps page.

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These are Convective Outlooks from the Storm Prediction Center. Click to see Days 1-3 broken down into Tornado, Wind and Hail threats, as well as days 5-8 outlooks.

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Atlantic Hurricane and Tropical Storm Tracking Map
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<p>Hurricane Tracking from F5Weather</a></div>

Our hurricane tracking map monitors for any current or forecast tropical disturbances in the Atlantic. (See our Pacific Hurricane Tracker) Various hurricane models will draw a 'spaghetti plot' in the Atlantic Basin when a disturbance is forecast or exists, showing the system's forecast track. Once a storm has developed, the National Hurricane Center will forecast their official track. This will show up on the map along with the storm's current intensity, track and name. We will also plot some of the storm's vitals and of course the spaghetti plots from the models along with the NHC forecast track will give you an idea of where it's heading, and its forecast intensity with time.

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To view the latest computer models, visit f5wx.com for access to the weather maps and guidance that meteorologists use to make their forecasts.
 
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View Skew-T soundings, textual data tables for your location, and of course maps! Weather forecast maps of the basics like temperature, wind, pressure, humidity, dew point, cloud cover, simulated radar, travel weather, rainfall and snow are available. More advanced users can also get use out of our severe weather & tornado threat maps, as well as upper air & shear graphics.
 
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Climate Summary
(made with AI, use with caution)
Delavan, Illinois Climate Summary

General Climate

    •   Delavan, Illinois has a humid continental climate, with warm, humid summers and cold, snowy winters.
    •   The average annual temperature is 49.3°F (9.6°C).
    •   The average annual precipitation is 36.2 inches (919 mm).
    •   The average annual snowfall is 30.9 inches (785 mm).

Summer

    •   The average summer temperature is 73.9°F (23.3°C).
    •   The average July temperature is 80.6°F (27°C).
    •   The average August temperature is 79.4°F (26.3°C).
    •   The average summer precipitation is 10.9 inches (277 mm).

Winter

    •   The average winter temperature is 24.2°F (-4.3°C).
    •   The average January temperature is 20.8°F (-6.2°C).
    •   The average February temperature is 27.8°F (-2.3°C).
    •   The average winter precipitation is 9.4 inches (239 mm).

Spring

    •   The average spring temperature is 47.6°F (8.7°C).
    •   The average April temperature is 54.3°F (12.4°C).
    •   The average May temperature is 64.3°F (17.9°C).
    •   The average spring precipitation is 9.5 inches (241 mm).

Fall

    •   The average fall temperature is 51.1°F (10.6°C).
    •   The average September temperature is 66.9°F (19.4°C).
    •   The average October temperature is 53.3°F (11.8°C).
    •   The average fall precipitation is 6.4 inches (163 mm).

Extreme Weather

    •   The highest recorded temperature in Delavan, Illinois was 115°F (46.1°C) on July 14, 1936.
    •   The lowest recorded temperature in Delavan, Illinois was -38°F (-38.9°C) on January 20, 1985.
    •   The greatest 24-hour snowfall in Delavan, Illinois was 18.5 inches (47 cm) on January 13, 1979.

Facts & Historical Information
(made with AI, use with caution)
Natural History

    •   Delavan Lake, a 950-acre glacial lake, is home to diverse fish species and waterfowl.

    •   The city is located within the Grand Prairie Natural Division, known for its tallgrass prairies and oak savannas.

Science

    •   Delavan was a hub for scientific research in the late 19th century.

    •   The Illinois Natural History Survey established a field station in Delavan in 1888, studying the lake and its ecosystem.

Personalities

  • Stephen Forbes:

    Entomologist and ecologist who founded the Illinois Natural History Survey and conducted groundbreaking research in Delavan.

  • Richard E. Blackwelder:

    Entomologist and taxonomist who made significant contributions to insect classification and described over 1,000 new species.

  • John Wesley Powell:

    Explorer and geologist who led the first scientific expedition down the Colorado River and later became the first director of the U.S. Geological Survey. Powell visited Delavan in 1868.

    • Tourist Attractions
    1.Delavan Lake

    A picturesque 1,200-acre lake offering swimming, boating, fishing, and scenic views.

    2.Starved Rock State Park

    A stunning natural area featuring towering sandstone canyons, waterfalls, and hiking trails. Located approximately 30 miles northeast of Delavan.

    3.Peoria Riverfront Museum

    An interactive museum showcasing art, history, and science exhibits. Located approximately 20 miles southwest of Delavan in Peoria.

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