Mercer County, NJ Climate

Mercer County, NJ has a humid subtropical climate, characterized by hot, humid summers and cool to mild winters. Average temperatures range from the mid-50s Fahrenheit in January to the low-80s Fahrenheit in July. Precipitation is plentiful throughout the year, with an average yearly total of 44 inches. The area receives ample amounts of sunshine, with more than 200 sunny days per year on average. Humidity levels tend to be high during the summer months as well. Snowfall is common in the winter months, with an average of 22 inches per season.

Mercer County, New Jersey gets 48 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Mercer County averages 21 inches of snow per year. The US average is 28 inches of snow per year.

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

Mercer County gets some kind of precipitation, on average, 121 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 86 degrees
Winter Low: the January low is 22
Rain: averages 48 inches of rain a year
Snow: averages 21 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Mercer County is 7.2 (10=best), which means it is about average compared to other places in New Jersey.

8.7 Summer - 5.4 Winter

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

Climate	Mercer, New Jersey	United States
	47.5 in.	38.1 in.
	21.0 in.	27.8 in.
	121.1 days	106.2 days
	205 days	205 days
	85.6°	85.8°
	21.9°	21.7°
	7.2	7
	4	4.3
	133 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 Mercer County with an average high temperature of 85.6°, which ranks it as warmer than most places in New Jersey. In Mercer County, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Mercer County are September, June and May.

In Mercer County, there are 17.4 days annually when the high temperature is over 90°, which is about average compared to other places in New Jersey.

January has the coldest nighttime temperatures for Mercer County with an average of 21.9°. This is colder than most places in New Jersey.

In Mercer County, there are 109.4 days annually when the nighttime low temperature falls below freezing, which is colder than most places in New Jersey.

In Mercer County, there are 0.6 days annually when the nighttime low temperature falls below zero°, which is about average compared to other places in New Jersey.

The humidity is usually comfortable in Mercer 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.

July is the wettest month in Mercer County with 5.1 inches of rain, and the driest month is February with 2.6 inches. The wettest season is Autumn with 29% of yearly precipitation and 21% occurs in Spring, which is the driest season. The annual rainfall of 47.5 inches in Mercer County means that it is about average compared to other places in New Jersey.

May is the rainiest month in Mercer County with 11.8 days of rain, and September is the driest month with only 8.6 rainy days. There are 121.1 rainy days annually in Mercer County, which is rainier than most places in New Jersey. The rainiest season is Summer when it rains 28% of the time and the driest is Winter with only a 22% chance of a rainy day.

An annual snowfall of 21.0 inches in Mercer County means that it is less snowy than most places in New Jersey. February is the snowiest month in Mercer County with 6.8 inches of snow, and 5 months of the year have significant snowfall.

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