Our Proprietary 10-Day Forecast

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Current warnings over Johnsburg, 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 Johnsburg, 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 Johnsburg, 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 McHenry 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 Johnsburg, 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 Johnsburg, 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 Johnsburg, 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 Johnsburg, 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 Johnsburg, 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 McHenry 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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  • 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)
Johnsburg, Illinois Climate Summary

General Climate

    •   Johnsburg, Illinois experiences a humid continental climate, characterized by hot, humid summers and cold, snowy winters.
    •   The city's proximity to Lake Michigan helps moderate temperatures, resulting in cooler summers and milder winters compared to inland areas.

Temperature

    •   Average Annual Temperature: 49.4°F (9.7°C)
    •   Average Summer Temperature (June-August): 73.4°F (23°C)
    •   Average Winter Temperature (December-February): 26.6°F (-3°C)
    •   Record High Temperature: 107°F (41.7°C)
    •   Record Low Temperature: -30°F (-34.4°C)

Precipitation

    •   Average Annual Precipitation: 36.1 inches (91.7 cm)
    •   Average Snowfall: 36.5 inches (92.7 cm)
    •   Rainiest Month: July (4.06 inches or 10.3 cm)
    •   Driest Month: February (1.58 inches or 4 cm)

Humidity

    •   Average Annual Relative Humidity: 74%
    •   Highest Humidity: July (80%)
    •   Lowest Humidity: February (65%)

Wind

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

Climate Extremes

    •   Johnsburg has experienced extreme weather events, including tornadoes, severe thunderstorms, and heavy snowfall.
    •   The city is located in an area prone to derechos, which are widespread, long-lived windstorms that can cause significant damage.

Climate Change Impact

    •   Climate change is projected to bring warmer temperatures, increased precipitation, and more frequent extreme weather events to Johnsburg and the surrounding region.
    •   Rising temperatures could lead to longer and more intense heat waves, while heavier rainfall could result in more flooding.
    •   Changes in climate are also likely to impact local ecosystems, agriculture, and human health.

Overall, Johnsburg's climate is characterized by hot, humid summers and cold, snowy winters, with moderate temperatures and precipitation throughout the year. The city's proximity to Lake Michigan helps moderate temperatures and provides a source of moisture for the region.

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

    •   Johnsburg is home to the Volo Bog State Natural Area, the largest remaining fen in Illinois. It harbors a diverse ecosystem with rare plants and animals.

    •   The Nippersink Creek, which flows through Johnsburg, is a designated Illinois Natural Area. It supports a variety of fish species and provides habitat for waterfowl.

Historical Personalities

  • Dr. John Brink:

    A prominent physician and founder of Johnsburg in 1835. He established the first school and post office in the area.

  • Dr. William LeBaron Jenney:

    An architect known as the \

    • Tourist Attractions
    1.Chain O'Lakes State Park:

    A sprawling park with 10 lakes, offering opportunities for boating, fishing, hiking, and camping.

    2.McHenry County Historical Society and Museum:

    A museum that showcases the history of McHenry County, including exhibits on the area's Native American, pioneer, and industrial heritage.

    3.Three Oaks Recreation Area:

    A park with a beach, boat launch, picnic areas, and hiking trails along the Fox River.

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