Climate and Average Weather Year Round in New Castle United StatesIn New Castle, the summers are warm, humid, and partly cloudy and the winters are freezing, snowy, and mostly cloudy. Over the course of the year, the temperature typically varies from 19°F to 83°F and is rarely below 2°F or above 91°F. Based on the tourism score, the best time of year to visit New Castle for warm-weather activities is from mid June to mid September. Average Temperature in New CastleThe warm season lasts for 3.8 months, from May 24 to September 16, with an average daily high temperature above 73°F. The hottest month of the year in New Castle is July, with an average high of 83°F and low of 62°F. The cold season lasts for 3.2 months, from November 30 to March 4, with an average daily high temperature below 44°F. The coldest month of the year in New Castle is January, with an average low of 21°F and high of 34°F.
The figure below shows you a compact characterization of the entire year of hourly average temperatures. The horizontal axis is the day of the year, the vertical axis is the hour of the day, and the color is the average temperature for that hour and day. Average Hourly Temperature in New Castle
frigid
15°F
freezing
32°F
very cold
45°F
cold
55°F
cool
65°F
comfortable
75°F
warm
85°F
hot
95°F
sweltering
The average hourly temperature, color coded into bands. The shaded overlays indicate night and civil twilight.
Teplodar, Ukraine (5,048 miles away) and Akht’ala, Armenia (5,808 miles) are the far-away foreign places with temperatures most similar to New Castle (view comparison). 
Compare New Castle to another city:CloudsIn New Castle, the average percentage of the sky covered by clouds experiences significant seasonal variation over the course of the year. The clearer part of the year in New Castle begins around May 12 and lasts for 5.9 months, ending around November 9. The clearest month of the year in New Castle is August, during which on average the sky is clear, mostly clear, or partly cloudy 65% of the time. The cloudier part of the year begins around November 9 and lasts for 6.1 months, ending around May 12. The cloudiest month of the year in New Castle is January, during which on average the sky is overcast or mostly cloudy 70% of the time.
PrecipitationA wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in New Castle varies throughout the year. The wetter season lasts 5.9 months, from March 28 to September 24, with a greater than 30% chance of a given day being a wet day. The month with the most wet days in New Castle is June, with an average of 11.6 days with at least 0.04 inches of precipitation. The drier season lasts 6.1 months, from September 24 to March 28. The month with the fewest wet days in New Castle is January, with an average of 6.6 days with at least 0.04 inches of precipitation. Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. The month with the most days of rain alone in New Castle is June, with an average of 11.6 days. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 40% on June 14.
RainfallTo show variation within the months and not just the monthly totals, we show the rainfall accumulated over a sliding 31-day period centered around each day of the year. New Castle experiences significant seasonal variation in monthly rainfall. Rain falls throughout the year in New Castle. The month with the most rain in New Castle is June, with an average rainfall of 3.4 inches. The month with the least rain in New Castle is February, with an average rainfall of 1.3 inches. Average Monthly Rainfall in New Castle
The average rainfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average snowfall.
SnowfallAs with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. New Castle experiences significant seasonal variation in monthly snowfall. The snowy period of the year lasts for 4.6 months, from November 16 to April 4, with a sliding 31-day snowfall of at least 1.0 inches. The month with the most snow in New Castle is February, with an average snowfall of 4.7 inches. The snowless period of the year lasts for 7.4 months, from April 4 to November 16. The least snow falls around July 18, with an average total accumulation of 0.0 inches. Average Monthly Snowfall in New Castle
The average snowfall (solid line) accumulated over the course of a sliding 31-day period centered on the day in question, with 25th to 75th and 10th to 90th percentile bands. The thin dotted line is the corresponding average rainfall.
SunThe length of the day in New Castle varies significantly over the course of the year. In 2024, the shortest day is December 21, with 9 hours, 13 minutes of daylight; the longest day is June 20, with 15 hours, 8 minutes of daylight. Hours of Daylight and Twilight in New Castle
The number of hours during which the Sun is visible (black line). From bottom (most yellow) to top (most gray), the color bands indicate: full daylight, twilight (civil, nautical, and astronomical), and full night.
The earliest sunrise is at 5:48 AM on June 14, and the latest sunrise is 2 hours, 5 minutes later at 7:54 AM on November 2. The earliest sunset is at 4:52 PM on December 7, and the latest sunset is 4 hours, 5 minutes later at 8:57 PM on June 26. Daylight saving time (DST) is observed in New Castle during 2024, starting in the spring on March 10, lasting 7.8 months, and ending in the fall on November 3. Sunrise & Sunset with Twilight and Daylight Saving Time in New Castle
The solar day over the course of the year 2024. From bottom to top, the black lines are the previous solar midnight, sunrise, solar noon, sunset, and the next solar midnight. The day, twilights (civil, nautical, and astronomical), and night are indicated by the color bands from yellow to gray. The transitions to and from daylight saving time are indicated by the 'DST' labels.
The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation. Solar Elevation and Azimuth in New Castle
northeastsouthwest
Solar elevation and azimuth over the course of the year 2024. The black lines are lines of constant solar elevation (the angle of the sun above the horizon, in degrees). The background color fills indicate the azimuth (the compass bearing) of the sun. The lightly tinted areas at the boundaries of the cardinal compass points indicate the implied intermediate directions (northeast, southeast, southwest, and northwest).
MoonThe figure below presents a compact representation of key lunar data for 2024. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases. HumidityWe base the humidity comfort level on the dew point, as it determines whether perspiration will evaporate from the skin, thereby cooling the body. Lower dew points feel drier and higher dew points feel more humid. Unlike temperature, which typically varies significantly between night and day, dew point tends to change more slowly, so while the temperature may drop at night, a muggy day is typically followed by a muggy night. New Castle experiences significant seasonal variation in the perceived humidity. The muggier period of the year lasts for 3.8 months, from May 28 to September 22, during which time the comfort level is muggy, oppressive, or miserable at least 12% of the time. The month with the most muggy days in New Castle is July, with 13.0 days that are muggy or worse. The least muggy day of the year is February 23, when muggy conditions are essentially unheard of.
WindThis section discusses the wide-area hourly average wind vector (speed and direction) at 10 meters above the ground. The wind experienced at any given location is highly dependent on local topography and other factors, and instantaneous wind speed and direction vary more widely than hourly averages. The average hourly wind speed in New Castle experiences significant seasonal variation over the course of the year. The windier part of the year lasts for 5.3 months, from November 14 to April 23, with average wind speeds of more than 5.0 miles per hour. The windiest month of the year in New Castle is February, with an average hourly wind speed of 6.6 miles per hour. The calmer time of year lasts for 6.7 months, from April 23 to November 14. The calmest month of the year in New Castle is August, with an average hourly wind speed of 3.4 miles per hour.
The predominant average hourly wind direction in New Castle varies throughout the year. The wind is most often from the south for 1.0 months, from September 2 to October 3, with a peak percentage of 33% on October 2. The wind is most often from the west for 11 months, from October 3 to September 2, with a peak percentage of 48% on January 1. Wind Direction in New Castle
northeastsouthwest
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions, excluding hours in which the mean wind speed is less than 1.0 mph. The lightly tinted areas at the boundaries are the percentage of hours spent in the implied intermediate directions (northeast, southeast, southwest, and northwest).
Water TemperatureNew Castle is located near a large body of water (e.g., ocean, sea, or large lake). This section reports on the wide-area average surface temperature of that water. The average water temperature experiences extreme seasonal variation over the course of the year. The time of year with warmer water lasts for 3.1 months, from June 23 to September 27, with an average temperature above 66°F. The month of the year in New Castle with the warmest water is August, with an average temperature of 73°F. The time of year with cooler water lasts for 4.2 months, from December 18 to April 23, with an average temperature below 41°F. The month of the year in New Castle with the coolest water is February, with an average temperature of 34°F.
Best Time of Year to VisitTo characterize how pleasant the weather is in New Castle throughout the year, we compute two travel scores. The tourism score favors clear, rainless days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit New Castle for general outdoor tourist activities is from mid June to mid September, with a peak score in the second week of August. Tourism Score in New Castle
The tourism score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
The beach/pool score favors clear, rainless days with perceived temperatures between 75°F and 90°F. Based on this score, the best time of year to visit New Castle for hot-weather activities is from late June to mid August, with a peak score in the third week of July. Beach/Pool Score in New Castle
The beach/pool score (filled area), and its constituents: the temperature score (red line), the cloud cover score (blue line), and the precipitation score (green line).
MethodologyFor each hour between 8:00 AM and 9:00 PM of each day in the analysis period (1980 to 2016), independent scores are computed for perceived temperature, cloud cover, and total precipitation. Those scores are combined into a single hourly composite score, which is then aggregated into days, averaged over all the years in the analysis period, and smoothed. Our cloud cover score is 10 for fully clear skies, falling linearly to 9 for mostly clear skies, and to 1 for fully overcast skies. Our precipitation score, which is based on the three-hour precipitation centered on the hour in question, is 10 for no precipitation, falling linearly to 9 for trace precipitation, and to 0 for 0.04 inches of precipitation or more. Our tourism temperature score is 0 for perceived temperatures below 50°F, rising linearly to 9 for 65°F, to 10 for 75°F, falling linearly to 9 for 80°F, and to 1 for 90°F or hotter. Our beach/pool temperature score is 0 for perceived temperatures below 65°F, rising linearly to 9 for 75°F, to 10 for 82°F, falling linearly to 9 for 90°F, and to 1 for 100°F or hotter. Growing SeasonDefinitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere). The growing season in New Castle typically lasts for 5.3 months (164 days), from around May 2 to around October 13, rarely starting before April 13 or after May 25, and rarely ending before September 25 or after October 31. Time Spent in Various Temperature Bands and the Growing Season in New Castle
frigid
15°F
freezing
32°F
very cold
45°F
cold
55°F
cool
65°F
comfortable
75°F
warm
85°F
hot
95°F
sweltering
The percentage of time spent in various temperature bands. The black line is the percentage chance that a given day is within the growing season.
Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F. Based on growing degree days alone, the first spring blooms in New Castle should appear around April 7, only rarely appearing before March 21 or after April 20. Solar EnergyThis section discusses the total daily incident shortwave solar energy reaching the surface of the ground over a wide area, taking full account of seasonal variations in the length of the day, the elevation of the Sun above the horizon, and absorption by clouds and other atmospheric constituents. Shortwave radiation includes visible light and ultraviolet radiation. The average daily incident shortwave solar energy experiences extreme seasonal variation over the course of the year. The brighter period of the year lasts for 3.8 months, from May 1 to August 25, with an average daily incident shortwave energy per square meter above 5.7 kWh. The brightest month of the year in New Castle is June, with an average of 6.7 kWh. The darker period of the year lasts for 3.4 months, from November 4 to February 14, with an average daily incident shortwave energy per square meter below 2.5 kWh. The darkest month of the year in New Castle is December, with an average of 1.5 kWh.
TopographyFor the purposes of this report, the geographical coordinates of New Castle are 41.004 deg latitude, -80.347 deg longitude, and 837 ft elevation. The topography within 2 miles of New Castle contains only modest variations in elevation, with a maximum elevation change of 413 feet and an average elevation above sea level of 974 feet. Within 10 miles contains only modest variations in elevation (692 feet). Within 50 miles contains significant variations in elevation (1,135 feet). The area within 2 miles of New Castle is covered by artificial surfaces (81%) and trees (19%), within 10 miles by trees (44%) and cropland (42%), and within 50 miles by trees (54%) and cropland (31%). Data SourcesThis report illustrates the typical weather in New Castle, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016. Temperature and Dew PointThere are 3 weather stations near enough to contribute to our estimation of the temperature and dew point in New Castle. For each station, the records are corrected for the elevation difference between that station and New Castle according to the International Standard Atmosphere , and by the relative change present in the MERRA-2 satellite-era reanalysis between the two locations. The estimated value at New Castle is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between New Castle and a given station. The stations contributing to this reconstruction are:
 To get a sense of how much these sources agree with each other, you can view a comparison of New Castle and the stations that contribute to our estimates of its temperature history and climate. Please note that each source's contribution is adjusted for elevation and the relative change present in the MERRA-2 data. Other DataAll data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Algorithms 2nd Edition , by Jean Meeus. All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid. Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations. Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory. Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database . Time zones for airports and weather stations are provided by AskGeo.com . Maps are © OpenStreetMap contributors. DisclaimerThe information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site. We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands. We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader. Please review our full terms contained on our Terms of Service page. |
