Our Proprietary 10-Day Forecast

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Current warnings over Callahan, Florida
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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 Callahan, Florida 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 Callahan, Florida 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 Nassau County, FL

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 Callahan, Florida

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 Callahan, FL 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 Callahan, FL

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 Callahan, FL, 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 Callahan, Florida

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 Nassau County, Florida

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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  • Canadian GDPS GEM
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  • 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)
Callahan, Florida Climate Summary

Temperature

    •   Average annual temperature: 69.6°F (20.9°C)
    •   Average summer temperature: 82.2°F (27.9°C)
    •   Average winter temperature: 55.6°F (13.1°C)
    •   Highest recorded temperature: 105°F (40.6°C)
    •   Lowest recorded temperature: 10°F (-12.2°C)

Precipitation

    •   Average annual precipitation: 52.82 inches (134.2 cm)
    •   Average number of rainy days per year: 113
    •   Wettest month: August (8.31 inches)
    •   Driest month: April (2.69 inches)

Humidity

    •   Average annual relative humidity: 78%
    •   Highest average relative humidity: September (83%)
    •   Lowest average relative humidity: April (69%)

Wind

    •   Average annual wind speed: 7.6 mph (12.2 km/h)
    •   Most common wind direction: Northeast
    •   Strongest winds: July (8.7 mph)
    •   Calmest winds: December (6.3 mph)

Sunshine

    •   Average annual sunshine: 2,685 hours
    •   Sunniest month: July (307 hours)
    •   Cloudiest month: December (191 hours)

Climate Classification

    •   Humid subtropical climate (Köppen climate classification: Cfa)

Overall

Callahan, Florida has a humid subtropical climate with hot, humid summers and mild, dry winters. The average annual temperature is 69.6°F (20.9°C), and the average annual precipitation is 52.82 inches (134.2 cm). The wettest month is August, and the driest month is April. The average annual sunshine is 2,685 hours, and the sunniest month is July.

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

    •   Callahan is home to the largest freshwater spring in Florida, Blue Springs, which discharges over 100 million gallons of water per day.

    •   The surrounding area is part of the Okefenokee Swamp, a vast wetland ecosystem known for its biodiversity.

Science

    •   In 1969, the Apollo 11 astronauts trained in Callahan's wetlands to simulate the lunar surface.

    •   The city is a hub for environmental research, with the University of Florida's Institute of Food and Agricultural Sciences (IFAS) having a major presence.

Personalities

  • James Callahan:

    A prominent 19th-century landowner and politician who founded the town.

  • Dr. Robert Johnson:

    A renowned botanist and environmentalist who established the Blue Springs State Park.

  • Dr. John Muir:

    The \

    • Tourist Attractions
    1.Osceola National Forest

    is a vast, diverse forest that offers a variety of recreational activities, including hiking, camping, fishing, and hunting. The forest is home to a variety of wildlife, including deer, turkey, and black bear.

    2.Amelia Island State Park

    is a beautiful park located on Amelia Island, just a short drive from Callahan. The park features a pristine beach, as well as hiking trails, picnic areas, and a playground.

    3.Fort Clinch State Park

    is a historic park located on Amelia Island, just a short drive from Callahan. The park features a well-preserved fort that was built in the 19th century, as well as a museum, hiking trails, and picnic areas.

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