Our Proprietary 10-Day Forecast

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Current warnings over Hallam, Pennsylvania
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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 Hallam, Pennsylvania 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 Hallam, Pennsylvania 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 York County, PA

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 Hallam, Pennsylvania

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 Hallam, PA 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 Hallam, PA

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 Hallam, PA, 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 Hallam, Pennsylvania

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 York County, Pennsylvania

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)
Hallam, Pennsylvania Climate Summary

General Climate

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

Temperature

    •   Average annual temperature: 54.7°F (12.6°C)
    •   Average summer temperature (June-August): 75.6°F (24.2°C)
    •   Average winter temperature (December-February): 32.2°F (0.1°C)
    •   Record high temperature: 105°F (40.6°C)
    •   Record low temperature: -17°F (-27.2°C)

Precipitation

    •   Average annual precipitation: 42.4 inches (107.7 cm)
    •   Average snowfall: 25.6 inches (65 cm)
    •   Most precipitation occurs in May and June.
    •   Least precipitation occurs in January and February.

Humidity

    •   Average annual relative humidity: 70%
    •   Summers are humid, with average relative humidity exceeding 75%.
    •   Winters are less humid, with average relative humidity around 65%.

Wind

    •   Prevailing wind direction: West-northwest
    •   Average wind speed: 10 mph (16 km/h)

Sunshine

    •   Average annual sunshine: 55%
    •   Summers are sunnier, with average sunshine exceeding 60%.
    •   Winters are cloudier, with average sunshine below 45%.

Additional Information

    •   Hallam is located in USDA Plant Hardiness Zone 6b.
    •   The growing season typically lasts from April to October.
    •   The area is prone to occasional thunderstorms, especially during the summer months.
    •   Hallam experiences an average of 10 days per year with temperatures below freezing.
    •   The average number of days with measurable precipitation is 110 per year.

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

    •   Hallam is home to the Susquehanna River, a vital waterway that supports a diverse ecosystem.

    •   The area is rich in fossils, including trilobites, brachiopods, and crinoids, indicating a vibrant marine environment millions of years ago.

Science

    •   In 1840, Hallam became the site of one of the first iron furnaces in Pennsylvania, contributing to the region's industrial development.

    •   The town was also home to the Hallam Observatory, established in 1912, which made significant contributions to astronomy.

Personalities

    •   John Hallam, a prominent Quaker, founded the town in 1738 and established a grist mill that became a thriving business.

    •   Dr. William Darlington, a renowned botanist, lived in Hallam and discovered several new plant species.

    •   Dr. John Chapman, known as \

Tourist Attractions
1.Hallam Dam

is a historic dam located in Hallam, Pennsylvania. It was built in 1898 and is one of the oldest dams in the United States. The dam is a popular spot for fishing, boating, and swimming.

2.Susquehanna River Trail

is a 23-mile trail that follows the Susquehanna River from Harrisburg to York. The trail is popular for hiking, biking, and running.

3.York County Heritage Rail Trail

is a 19-mile trail that follows the former York County Railroad. The trail is popular for hiking, biking, and horseback riding.

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