New Castle County, DE Climate

New Castle, DE County has a humid subtropical climate, which is characterized by hot and humid summers and mild to cool winters. The average high temperature during the summer months ranges from the low to mid 80’s (Fahrenheit) and the average low in winter is near the mid-thirties. Precipitation is generally evenly distributed throughout the year, with most areas seeing around forty inches of rainfall annually. Snowfall can range from moderate to heavy during the winter seasons, depending on the year. Overall, New Castle County offers an enjoyable climate for both residents and visitors alike.

New Castle County, Delaware gets 45 inches of rain, on average, per year. The US average is 38 inches of rain per year.

New Castle County averages 14 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 201 sunny days per year in New Castle County. The US average is 205 sunny days.

New Castle County gets some kind of precipitation, on average, 112 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 24
Rain: averages 45 inches of rain a year
Snow: averages 14 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for New Castle County is 7.3 (10=best), which means it is about average compared to other places in Delaware.

8.4 Summer - 5.7 Winter

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

Climate	New Castle, Delaware	United States
	45.3 in.	38.1 in.
	14.1 in.	27.8 in.
	112.2 days	106.2 days
	201 days	205 days
	86.3°	85.8°
	24.1°	21.7°
	7.3	7
	4.1	4.3
	89 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 New Castle County with an average high temperature of 86.3°, which ranks it as cooler than most places in Delaware. In New Castle County, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for New Castle County are September, June and May.

In New Castle County, there are 18.5 days annually when the high temperature is over 90°, which is cooler than most places in Delaware.

January has the coldest nighttime temperatures for New Castle County with an average of 24.1°. This is colder than most places in Delaware.

In New Castle County, there are 94.0 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Delaware.

In New Castle County, there are 0.3 days annually when the nighttime low temperature falls below zero°, which is one of the coldest places in Delaware.

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

July is the wettest month in New Castle County with 4.7 inches of rain, and the driest month is February with 2.8 inches. The wettest season is Autumn with 27% of yearly precipitation and 21% occurs in Spring, which is the driest season. The annual rainfall of 45.3 inches in New Castle County means that it is wetter than most places in Delaware.

May is the rainiest month in New Castle County with 10.8 days of rain, and August is the driest month with only 8.0 rainy days. There are 112.2 rainy days annually in New Castle County, which is less rainy than most places in Delaware. 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 14.1 inches in New Castle County means that it is snowier than most places in Delaware. February is the snowiest month in New Castle County with 5.2 inches of snow, and 4 months of the year have significant snowfall.

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