Our Proprietary 10-Day Forecast

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Current warnings over Merrimack, New Hampshire
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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 Merrimack, New Hampshire 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 Merrimack, New Hampshire 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 Hillsborough County, NH

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 Merrimack, New Hampshire

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 Merrimack, NH 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 Merrimack, NH

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 Merrimack, NH, 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 Merrimack, New Hampshire

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 Hillsborough County, New Hampshire

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.
 
See the latest forecast data as the models update.
 
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Climate Summary
(made with AI, use with caution)
Merrimack, New Hampshire Climate Summary

General Climate

    •   Humid continental climate with warm, humid summers and cold, snowy winters.

Temperature

    •   Average Annual Temperature

48.6°F (9.2°C)

    •   Average Summer Temperature (June-August)

69.8°F (21.0°C)

    •   Average Winter Temperature (December-February)

23.9°F (-4.5°C)

    •   Record High Temperature

102°F (38.9°C)

    •   Record Low Temperature

-25°F (-31.7°C)

Precipitation

    •   Average Annual Precipitation

41.5 inches (1054 mm)

    •   Average Snowfall

55.4 inches (1407 mm)

    •   Wettest Month

October (4.3 inches / 109 mm)

    •   Driest Month

February (2.5 inches / 64 mm)

Sunshine

    •   Average Annual Sunshine

2,148 hours

    •   Sunniest Month

July (243 hours)

    •   Cloudiest Month

December (139 hours)

Wind

    •   Average Annual Wind Speed

10.2 mph (16.4 km/h)

    •   Prevailing Wind Direction

West-southwest

Other Climate Features

    •   Growing Season

160-180 days

    •   Hardiness Zone

5b

    •   Köppen Climate Classification

Dfb (Warm-summer Humid Continental Climate)

Climate Trends

    •   Merrimack has experienced a slight warming trend in recent decades, with an average temperature increase of about 1.5°F (0.8°C) since 1970.
    •   Precipitation has also increased slightly, with an average increase of about 2 inches (51 mm) since 1970.
    •   The frequency and intensity of extreme weather events, such as heat waves, droughts, and heavy precipitation, have also increased in recent years.

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

    •   Merrimack is home to the Merrimack River, the largest river in New England.

    •   The river is renowned for its salmon and shad runs, which have attracted anglers for centuries.

    •   The city is surrounded by the Merrimack River Valley, a fertile agricultural region known for its apple orchards.

Science

    •   In 1824, Merrimack became the site of the first textile mill in New Hampshire.

    •   The city was a major center of the textile industry until the mid-20th century.

    •   Today, Merrimack is home to several high-tech companies, including BAE Systems and Lockheed Martin.

Personalities

    •   Daniel Webster, the famous orator and statesman, was born in Merrimack in 1782.

    •   Mary Baker Eddy, the founder of the Christian Science Church, lived in Merrimack for several years in the mid-19th century.

    •   John Pillsbury, the founder of the Pillsbury Company, was born in Merrimack in 1822.

Tourist Attractions
1.Anheuser-Busch Merrimack Brewery Tour:

Take a guided tour of one of the largest and most technologically advanced breweries in the world, where you can learn about the brewing process and sample their famous beers.

2.Merrimack Premium Outlets:

With over 100 outlet stores offering discounts on designer brands, Merrimack Premium Outlets is a shopper's paradise.

3.The Palace Theatre:

This historic theater hosts a variety of live performances, including Broadway shows, concerts, and comedy acts.

Nearby Cities:

Litchfield, NH
Londonderry, NHBedford, NH
Nashua, NHHudson, NH
Milford, NHDerry, NH
Derry Village, NHPinardville, NH
Manchester, NHHollis, NH
Mont Vernon, NHWindham, NH
South Hooksett, NHPelham, NH
Brookline, NHAuburn, NH
Boston, MA
South Boston, MAWorcester, MA
Providence, RISpringfield, MA
Hartford, CTLowell, MA
Cambridge, MAWaterbury, CT
Albany, NYBrockton, MA
New Bedford, MA