Our Proprietary 10-Day Forecast

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Current warnings over Troy, 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 Troy, 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 Troy, 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 Madison 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 Troy, 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 Troy, 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 Troy, 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 Troy, 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 Troy, 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 Madison 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)
Troy, Illinois Climate Summary

General Climate


Troy, Illinois, experiences a humid continental climate, characterized by hot, humid summers and cold, dry winters. The city is located in USDA Hardiness Zone 6a, indicating that the average annual minimum temperature is between -10°F and -5°F.

Temperature


    •   Average Annual Temperature: 54.5°F (12.5°C)
    •   Average Summer Temperature (June-August): 78.5°F (25.8°C)
    •   Average Winter Temperature (December-February): 32.5°F (0.3°C)
    •   Record High Temperature: 117°F (47.2°C)
    •   Record Low Temperature: -26°F (-32.2°C)

Precipitation


    •   Average Annual Precipitation: 42.52 inches (108 cm)
    •   Average Number of Rainy Days: 106 days
    •   Average Snowfall: 17.6 inches (45 cm)

Humidity


    •   Average Annual Relative Humidity: 73%
    •   Summer Relative Humidity: 78%
    •   Winter Relative Humidity: 68%

Wind


    •   Average Wind Speed: 10.2 mph (16.4 km/h)
    •   Prevailing Wind Direction: Southwest

Climate Extremes


    •   Troy has experienced extreme weather events, including tornadoes, severe thunderstorms, and heat waves. The city is located in Tornado Alley, a region of the United States that experiences a high frequency of tornadoes.

Overall


Troy, Illinois, has a humid continental climate with hot, humid summers and cold, dry winters. The city receives ample precipitation throughout the year, with occasional snowfall during the winter months. Residents of Troy should be prepared for extreme weather events, such as tornadoes and heat waves.

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

    •   Troy is home to the largest limestone quarry in the Midwest, providing building materials for iconic structures like the Empire State Building.

    •   The Mississippi River floodplain near Troy supports diverse wildlife, including bald eagles, white-tailed deer, and river otters.

Science

    •   Troy was the site of the first commercial production of penicillin in the United States in 1943.

    •   The city is home to the Troy Scientific Center, a research and development facility for pharmaceutical and chemical companies.

Personalities

  • George Rogers Clark:

    American Revolutionary War general who captured Fort Sackville in nearby Cahokia.

  • Abraham Lincoln:

    Visited Troy in 1858 during his campaign for the U.S. Senate.

  • Charles Lindbergh:

    Flew over Troy in 1927 during his transatlantic flight.

    • Tourist Attractions
    1.Cahokia Mounds State Historic Site

    (Collinsville, IL): A UNESCO World Heritage Site, Cahokia Mounds is the largest pre-Columbian settlement north of Mexico. It features towering earthen mounds, a museum, and a reconstructed village.

    2.Gateway Arch National Park

    (St. Louis, MO): Just across the Mississippi River from Troy, this iconic landmark offers stunning views of the city and the surrounding area. Visitors can take a tram to the top of the arch or explore the museum at its base.

    3.Grant's Farm

    (St. Louis, MO): This historic farm was once owned by President Ulysses S. Grant. Today, it's a popular tourist attraction with a variety of animals, including Clydesdale horses, goats, and deer. Visitors can also tour the Grant's home and explore the beautiful gardens.

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