Our Proprietary 10-Day Forecast

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Current warnings over Green Valley, Maryland
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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 Green Valley, Maryland 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 Green Valley, Maryland 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 Harford County, MD

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 Green Valley, Maryland

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 Green Valley, MD 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 Green Valley, MD

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 Green Valley, MD, 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 Green Valley, Maryland

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 Harford County, Maryland

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.
 
Get access to:
  • European ECMWF HRES
  • 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.
 
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Climate Summary
(made with AI, use with caution)
Green Valley, MD Climate Summary

Average Temperature

54.6°F (12.6°C)

Average High Temperature

64.4°F (18°C)

Average Low Temperature

44.8°F (7.1°C)

Average Annual Precipitation

43.19 inches (109.7 cm)

Average Annual Snowfall

18.1 inches (46 cm)

Climate Zone

Humid subtropical climate (Köppen climate classification Cfa)

General Climate

    •   Green Valley, MD has a humid subtropical climate, with hot, humid summers and mild winters.
    •   The average temperature in Green Valley is 54.6°F (12.6°C), with an average high of 64.4°F (18°C) and an average low of 44.8°F (7.1°C).
    •   The average annual precipitation in Green Valley is 43.19 inches (109.7 cm), with the majority of the rain falling during the summer months.
    •   The average annual snowfall in Green Valley is 18.1 inches (46 cm), with most of the snow falling during the winter months.

Summer

    •   The summers in Green Valley are hot and humid, with average temperatures in the mid-80s°F (low 30s°C).
    •   The hottest month of the year is July, with an average temperature of 86.9°F (30.5°C).
    •   The average relative humidity in the summer is around 70%.
    •   Thunderstorms are common during the summer months.

Winter

    •   The winters in Green Valley are mild, with average temperatures in the mid-30s°F (low 2s°C).
    •   The coldest month of the year is January, with an average temperature of 32.6°F (0.3°C).
    •   The average relative humidity in the winter is around 60%.
    •   Snowfall is common during the winter months, but it typically melts quickly.

Spring and Fall

    •   The spring and fall seasons in Green Valley are mild, with average temperatures in the mid-50s°F (low 10s°C) to mid-60s°F (mid-10s°C).
    •   The average relative humidity in the spring and fall is around 65%.
    •   Spring and fall are generally pleasant times to visit Green Valley.

Climate Change

    •   The climate in Green Valley is changing, with average temperatures increasing and precipitation patterns becoming more extreme.
    •   The average temperature in Green Valley has increased by about 2°F (1°C) since the early 20th century.
    •   The amount of precipitation that falls in Green Valley has also increased, with the average annual precipitation increasing by about 5 inches (13 cm) since the early 20th century.
    •   The frequency and intensity of extreme weather events, such as heat waves, droughts, and floods, has also increased in Green Valley.

Facts & Historical Information
(made with AI, use with caution)
Green Valley, Maryland, is a census-designated place in Frederick County, known for its natural beauty and historical significance.

Natural History

    •   Green Valley is located within the Catoctin Mountain physiographic province, characterized by rolling hills and forested valleys.

    •   The area is home to diverse flora and fauna, including black bears, deer, and various bird species.

    •   The Monocacy River, a tributary of the Potomac River, flows through Green Valley, providing a habitat for aquatic life.

Science

    •   Green Valley is home to the National Institute of Standards and Technology (NIST), a leading research institution in physical sciences.

    •   NIST's campus includes the Gaithersburg Site, where scientists conduct groundbreaking research in areas such as quantum computing and materials science.

    •   The University of Maryland, College Park, has a research facility in Green Valley, focusing on environmental science and sustainability.

Personalities

    •   Green Valley has been home to several notable figures, including:

    •   John Hanson, the first President of the Continental Congress, lived in Green Valley from 1769 until his death in 1783.

    •   Francis Scott Key, the author of \

Tourist Attractions
1.Green Valley Farm

is a working farm that offers a variety of activities for visitors, including farm tours, hayrides, and a petting zoo. The farm also has a farm store where you can purchase fresh produce, meats, and cheeses.

2.The Maryland Zoo in Baltimore

is a 135-acre zoo that is home to over 2,000 animals from around the world. The zoo has a variety of exhibits, including a polar bear exhibit, a penguin exhibit, and a reptile exhibit.

3.The National Aquarium

is a 3-story aquarium that is home to over 17,000 animals from around the world. The aquarium has a variety of exhibits, including a dolphin exhibit, a shark exhibit, and a jellyfish exhibit.

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