Our Proprietary 10-Day Forecast

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Current warnings over Grantham, 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 Grantham, 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 Grantham, 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 Sullivan 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 Grantham, 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 Grantham, 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 Grantham, 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 Grantham, 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 Grantham, 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 Sullivan 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.
 
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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)
Grantham, New Hampshire

Climate Summary

Temperature

    •   Average annual temperature: 43.5°F (6.4°C)
    •   Average summer temperature (June-August): 67.5°F (19.7°C)
    •   Average winter temperature (December-February): 22.5°F (-5.3°C)
    •   Record high temperature: 98°F (36.7°C)
    •   Record low temperature: -34°F (-36.7°C)

Precipitation

    •   Average annual precipitation: 45.3 inches (115.1 cm)
    •   Average rainfall: 39.2 inches (99.6 cm)
    •   Average snowfall: 61.1 inches (155.2 cm)
    •   Driest month: February (2.6 inches of precipitation)
    •   Wettest month: May (4.7 inches of precipitation)

Humidity

    •   Average relative humidity: 72%
    •   Most humid month: July (79%)
    •   Least humid month: February (63%)

Wind

    •   Average wind speed: 9.1 mph (14.6 km/h)
    •   Prevailing wind direction: West-northwest

Sunshine

    •   Average annual sunshine hours: 2,540
    •   Sunniest month: July (300 hours)
    •   Cloudiest month: December (140 hours)

Other Climate Features

    •   Hardiness zone: 5a
    •   Growing season: 150-170 days
    •   Average first frost: September 20th
    •   Average last frost: May 15th

Climate Classification

    •   Köppen climate classification: Dfb (Warm-summer humid continental climate)

General Climate Description

Grantham, New Hampshire experiences a humid continental climate with warm, humid summers and cold, snowy winters. Temperatures can fluctuate significantly throughout the year, with hot and humid conditions in the summer and freezing temperatures in the winter. Precipitation is well-distributed throughout the year, with slightly more rain in the spring and early summer. Snowfall is common during the winter months, with an average of over 5 feet of snow annually. The climate is generally comfortable for outdoor activities year-round, with pleasant temperatures in the spring and fall and opportunities for winter sports in the colder months.

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

    •   Grantham is home to the 3,000-acre Croydon Mountain Forest, a diverse ecosystem with hiking trails, waterfalls, and abundant wildlife.

    •   The town is part of the Connecticut River Valley and features the Little Sugar River, which supports a variety of fish species.

    •   Grantham's forests are important for carbon sequestration and provide habitat for migratory birds.

Science

    •   Dr. David Sibley, renowned ornithologist, grew up in Grantham and conducted extensive bird studies in the area.

    •   The town is home to the Grantham Laboratory, a research facility that focuses on environmental science and water quality monitoring.

    •   Grantham's natural resources have been studied by scientists from Dartmouth College and the University of New Hampshire.

Personalities

    •   Daniel Webster, famed orator and statesman, owned a summer home in Grantham and spent time there writing and relaxing.

    •   John Ledyard, an American explorer who accompanied Captain Cook on his third voyage, was born in Grantham.

    •   George Perkins Marsh, a conservationist and diplomat, lived in Grantham and wrote influential works on environmental stewardship.

Tourist Attractions
1.Mount Sunapee Resort

is a popular ski resort in the winter and a hiking destination in the summer. The resort offers a variety of ski trails and lifts, as well as a terrain park. In the summer, visitors can hike to the summit of Mount Sunapee for stunning views of the surrounding mountains and lakes.

2.Lake Sunapee

is a beautiful lake that offers a variety of recreational activities, including swimming, boating, fishing, and hiking. The lake is surrounded by mountains and forests, making it a popular destination for nature lovers.

3.Saint-Gaudens National Historical Park

is a historic site that preserves the home and studio of sculptor Augustus Saint-Gaudens. The park offers a variety of exhibits and programs that explore the life and work of Saint-Gaudens.

Nearby Cities:

Springfield, NH
Sunapee, NHNewport, NH
New London, NHGrafton, NH
Wilmot, NHEnfield, NH
Newbury, NHLebanon, NH
Windsor, VTClaremont, NH
Sutton, NHDanbury, NH
Unity, NHWhite River Junction, VT
Andover, NHWilder, VT
Boston, MA
South Boston, MAWorcester, MA
Providence, RISpringfield, MA
Hartford, CTLowell, MA
Cambridge, MAManchester, NH
Albany, NYBrockton, MA
West Albany, NY