New Castle, DE Climate


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United States / Delaware / Philadelphia-Camden-Wilmington Metro Area / New Castle County / New Castle / Zip Codes
New Castle, DE has a humid subtropical climate with hot and humid summers and mild winters. It experiences four distinct seasons each year, with the warmest temperatures in July and August, with average highs reaching into the mid 80s. Winter months bring cooler temperatures, although snowfall is rare. Rainfall is fairly evenly distributed throughout the year, making it an ideal spot for outdoor activities in all seasons.

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

New Castle averages 12 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 202 sunny days per year in New Castle. The US average is 205 sunny days.

New Castle gets some kind of precipitation, on average, 108 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 87 degrees
Winter Low: the January low is 24
Rain: averages 45 inches of rain a year
Snow: averages 12 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for New Castle 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, while January and February are the least comfortable months.

  ClimateNew Castle, DelawareUnited States
  44.9 in.38.1 in.
  12.4 in.27.8 in.
  108.1 days106.2 days
  202 days205 days
  86.9°85.8°
  23.9°21.7°
  7.37
  4.14.3
  10 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 with an average high temperature of 86.9°, which ranks it as warmer than most places in Delaware. In New Castle, there are 3 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for New Castle are September, May and June.
In New Castle, there are 20.9 days annually when the high temperature is over 90°, which is hotter than most places in Delaware.
January has the coldest nighttime temperatures for New Castle with an average of 23.9°. This is colder than most places in Delaware.
In New Castle, there are 97.1 days annually when the nighttime low temperature falls below freezing, which is colder than most places in Delaware.
In New Castle, 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 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 are July, August and June.
September is the wettest month in New Castle with 4.6 inches of rain, and the driest month is February with 2.7 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 44.9 inches in New Castle means that it is drier than most places in Delaware.
May is the rainiest month in New Castle with 10.5 days of rain, and October is the driest month with only 7.6 rainy days. There are 108.1 rainy days annually in New Castle, which is one of the least rainy places in Delaware. The rainiest season is Summer when it rains 28% of the time and the driest is Winter with only a 23% chance of a rainy day.
An annual snowfall of 12.4 inches in New Castle means that it is less snowy than most places in Delaware. January is the snowiest month in New Castle with 4.8 inches of snow, and 4 months of the year have significant snowfall.
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