Our Proprietary 10-Day Forecast

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Current warnings over Saint Jacob, 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 Saint Jacob, 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 Saint Jacob, 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 Saint Jacob, 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 Saint Jacob, 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 Saint Jacob, 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 Saint Jacob, 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 Saint Jacob, 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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  • American GFS
  • Canadian GDPS GEM
  • German DWD ICON
  • British MetOffice's UKMET Unified Model
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  • GEFS, GEPS, MOGREPS & European Ensembles
  • Probabilities & Averages
  • 3-Ensemble Mean & more!
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)
Saint Jacob, Illinois Climate Summary

Temperature

    •   Average annual temperature: 51.5°F (10.8°C)
    •   Average summer temperature (June-August): 73.6°F (23.1°C)
    •   Average winter temperature (December-February): 28.6°F (-1.9°C)
    •   Record highest temperature: 108°F (42.2°C)
    •   Record lowest temperature: -36°F (-37.8°C)

Precipitation

    •   Average annual precipitation: 36.8 inches (93.5 cm)
    •   Average snowfall: 24.8 inches (63.0 cm)
    •   Wettest month: May (4.6 inches)
    •   Driest month: February (1.6 inches)

Humidity

    •   Average annual relative humidity: 74%
    •   Highest monthly relative humidity: January (81%)
    •   Lowest monthly relative humidity: June (67%)

Wind

    •   Average annual wind speed: 10.4 mph (16.7 km/h)
    •   Most frequent wind direction: Southwest
    •   Strongest wind gust: 75 mph (121 km/h)

Severe Weather

    •   Saint Jacob is located in an area that is prone to severe weather, including tornadoes, hail, and thunderstorms.
    •   The area is also at risk for flooding.

Climate Change

    •   The climate of Saint Jacob is changing, as is the climate of the rest of the world.
    •   The average annual temperature has increased by about 1°F (0.6°C) since the late 19th century.
    •   The frequency and intensity of extreme weather events, such as heat waves, droughts, and floods, is also increasing.

Overall

    •   Saint Jacob has a humid continental climate with hot summers and cold winters.
    •   The area is prone to severe weather and is also at risk for flooding.
    •   The climate of Saint Jacob is changing, as is the climate of the rest of the world.

Facts & Historical Information
(made with AI, use with caution)
Saint Jacob, Illinois: Natural History and Personalities

  • Unique Geology:

    Saint Jacob sits atop the Devonian-Mississippian boundary, where two distinct geologic formations meet. This has resulted in a diverse array of fossils, including trilobites, brachiopods, and crinoids.

  • Ancient Forest:

    The nearby Kaskaskia River State Natural Area preserves a remnant of the vast oak-hickory forest that once covered the region. It is home to over 100 species of trees and a diverse understory.

  • Father Jacques Marquette:

    In 1673, French explorer Jacques Marquette passed through the area while paddling the Mississippi River. He named the nearby Kaskaskia River after the Native American tribe he encountered.

  • Dr. John M. Peck:

    A prominent 19th-century Baptist minister, Dr. Peck founded Shurtleff College in Upper Alton, Illinois. He also established the Baptist General Association of Illinois and served as its first president.

  • Historic Architecture:

    Saint Jacob boasts several well-preserved historic buildings, including the 1852 Saint Jacob United Church of Christ and the 1870s Jacob House, which now serves as a bed and breakfast.

    • Tourist Attractions
    1. Fort de Chartres State Historic Site

    2. Cahokia Mounds State Historic Site

    3. Lewis and Clark State Historic Site

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