Our Proprietary 10-Day Forecast

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Current warnings over Chelmsford, Massachusetts
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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 Chelmsford, Massachusetts 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 Chelmsford, Massachusetts 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 Middlesex County, MA

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 Chelmsford, Massachusetts

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 Chelmsford, MA 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 Chelmsford, MA

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 Chelmsford, MA, 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 Chelmsford, Massachusetts

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 Middlesex County, Massachusetts

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
  • American NAM
  • American HRRR
  • American NBM - National Blend of Models
  • 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.
 
See the latest forecast data as the models update.
 
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Climate Summary
(made with AI, use with caution)
Climate Summary for Chelmsford, MA

Location

Middlesex County, Massachusetts

Climate Zone

Humid Continental (Dfa)

Average Temperature

    •   Annual: 49.2°F (9.6°C)
    •   January: 28.3°F (-2.1°C)
    •   July: 71.4°F (21.9°C)

Average Precipitation

    •   Annual: 43.5 inches (1105 mm)
    •   Snowfall: 44.4 inches (113 cm)

Humidity

    •   Average relative humidity: 69%

Wind

    •   Prevailing wind direction: West-southwest
    •   Average wind speed: 10.2 mph (16.4 km/h)

Climate Characteristics

    •   Warm, humid summers

Temperatures typically reach the 80s°F (27°C) during the summer months, with high humidity levels.

    •   Cold, snowy winters

Winters are cold and snowy, with average temperatures below freezing. Snowfall can be significant, with an average of over 4 feet (1.2 meters) per year.

    •   Moderate precipitation

Chelmsford receives an average of 43.5 inches (1105 mm) of precipitation annually, which is evenly distributed throughout the year.

    •   Seasonal variability

The climate in Chelmsford is characterized by distinct seasons, with warm summers, cold winters, and mild spring and fall seasons.

    •   Proximity to the coast

Chelmsford's proximity to the Atlantic Ocean influences its climate, resulting in milder temperatures and higher humidity levels compared to inland areas.

Climate Change Impacts

    •   Rising temperatures

Average temperatures in Chelmsford are projected to increase by several degrees Celsius by the end of the century, leading to more frequent and intense heat waves.

    •   Increased precipitation

Climate models predict an increase in precipitation, with more frequent and heavy rainfall events.

    •   Changes in snowfall

Snowfall is expected to decrease in the future, with more precipitation falling as rain instead of snow.

    •   Sea level rise

Although Chelmsford is not directly on the coast, it could be indirectly affected by sea level rise through increased flooding and storm surges in nearby coastal areas.

Facts & Historical Information
(made with AI, use with caution)
Chelmsford, Massachusetts, boasts a rich natural and scientific heritage:

  • Glacial Sculpting:

    Chelmsford was shaped by glaciers during the last ice age, leaving behind unique landforms like drumlins and eskers.

  • Wetlands and Wildlife:

    The town is home to vast wetlands, including the Great Meadows National Wildlife Refuge, providing habitat for diverse bird species and other wildlife.

  • Historic Mill Sites:

    Chelmsford's industrial past is evident in its former mill sites, such as the Appleton Mills, which played a significant role in the textile industry.

  • Scientific Pioneers:

    Chelmsford was the birthplace of Elias Howe, inventor of the sewing machine, and the home of the Howe School, a renowned preparatory school known for its science and engineering programs.

  • Environmental Conservation:

    The town is committed to environmental conservation, with initiatives like the Chelmsford Open Space Program, which protects natural areas and promotes biodiversity.

    • Tourist Attractions
    1. Lowell National Historical Park: This park tells the story of the American Industrial Revolution and is home to many historic buildings and museums.

    2. The Museum of Science: This museum is a great place to learn about science and technology, with exhibits on everything from dinosaurs to space exploration.

    3. The USS Constitution: This historic ship is the oldest commissioned warship in the world and is a must-see for any history buff.

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    Billerica, MADracut, MA
    Tewksbury, MALittleton Common, MA
    Tyngsboro, MAPinehurst, MA
    Bedford, MAActon, MA
    Dunstable, MAConcord, MA
    West Concord, MAWilmington, MA
    Pelham, NHBurlington, MA
    Boston, MA
    South Boston, MAWorcester, MA
    Providence, RISpringfield, MA
    New Haven, CTHartford, CT
    Cambridge, MAManchester, NH
    Waterbury, CTAlbany, NY
    Brockton, MA