Northumberland County, PA Climate

Northumberland, PA County has a humid continental climate with four distinct seasons. Summers are warm and humid with temperatures averaging between 75-85°F and frequent rain showers. Winters are cold and snowy with temperatures often dropping below freezing. Spring and fall are mild with temperatures ranging from 30-70°F and moderate rainfall. Overall, the area receives around 45 inches of precipitation each year, making it one of the wettest regions in Pennsylvania.

Northumberland County, Pennsylvania gets 44 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Northumberland County averages 32 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 184 sunny days per year in Northumberland County. The US average is 205 sunny days.

Northumberland County gets some kind of precipitation, on average, 125 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.

Weather Highlights

Summer High: the July high is around 84 degrees
Winter Low: the January low is 18
Rain: averages 44 inches of rain a year
Snow: averages 32 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Northumberland County is 7.0 (10=best), which means it is more comfortable than most places in Pennsylvania.

9 Summer - 4.9 Winter

June, August and September are the most pleasant months in Northumberland County, while January and February are the least comfortable months.

Climate	Northumberland, Pennsylvania	United States
	43.7 in.	38.1 in.
	31.9 in.	27.8 in.
	125.3 days	106.2 days
	184 days	205 days
	83.6°	85.8°
	18.4°	21.7°
	7	7
	3.8	4.3
	771 ft.	2443 ft.

Climate

YOU SHOULD KNOW

Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

July is the hottest month for Northumberland County with an average high temperature of 83.6°, which ranks it as about average compared to other places in Pennsylvania. In Northumberland County, there are 5 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Northumberland County are June, August and September.

In Northumberland County, there are 9.0 days annually when the high temperature is over 90°, which is about average compared to other places in Pennsylvania.

January has the coldest nighttime temperatures for Northumberland County with an average of 18.4°. This is about average compared to other places in Pennsylvania.

In Northumberland County, there are 131.1 days annually when the nighttime low temperature falls below freezing, which is about average compared to other places in Pennsylvania.

In Northumberland County, there are 1.8 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Pennsylvania.

The humidity is usually comfortable in Northumberland County but some summer months can be sticky or muggy. July is the most humid month, though humidity is low for most of the year. The most humid months are July, August and June.

June is the wettest month in Northumberland County with 4.5 inches of rain, and the driest month is February with 2.4 inches. The wettest season is Autumn with 28% of yearly precipitation and 20% occurs in Spring, which is the driest season. The annual rainfall of 43.7 inches in Northumberland County means that it is about average compared to other places in Pennsylvania.

May is the rainiest month in Northumberland County with 12.4 days of rain, and February is the driest month with only 8.6 rainy days. There are 125.3 rainy days annually in Northumberland County, which is less rainy than most places in Pennsylvania. The rainiest season is Summer when it rains 27% of the time and the driest is Spring with only a 23% chance of a rainy day.

An annual snowfall of 31.9 inches in Northumberland County means that it is about average compared to other places in Pennsylvania. January is the snowiest month in Northumberland County with 10.6 inches of snow, and 6 months of the year have significant snowfall.

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