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Average Weather in Swansboro North Carolina, United States

In Swansboro, the temperature typically varies from 37°F to 87°F over the course of the year, and is rarely below 24°F or above 92°F.

The hot season lasts for 3.9 months, from May 28 to September 25, with an average daily high temperature above 80°F. The hottest day of the year is July 21, with an average high of 87°F and low of 75°F.

The cool season lasts for 3.1 months, from December 4 to March 8, with an average daily high temperature below 61°F. The coldest day of the year is January 29, with an average low of 37°F and high of 55°F.

Average High and Low Temperature

The daily average high (red line) and low (blue line) temperature with percentile bands, with 25th to 75th and 10th to 90th percentile bands. The thin dotted lines are the corresponding average perceived temperatures.

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

12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDecchillychillycoldcoldcoolcoolcomfortablecomfortablewarmwarmhothot
The average hourly temperature, color coded into bands: frigid < 15°F < freezing < 32°F < chilly < 45°F < cold < 55°F < cool < 65°F < comfortable < 75°F < warm < 85°F < hot < 95°F < sweltering. The shaded overlays indicate night and civil twilight.

Sun

The length of the day in Swansboro varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 50 minutes of daylight; the longest day is June 21, with 14 hours, 29 minutes of daylight.

Hours of Daylight and Twilight

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 5:54 AM on June 12, and the latest sunrise is 1 hour, 37 minutes later at 7:32 AM on November 4. The earliest sunset is at 4:57 PM on December 4, and the latest sunset is 3 hours, 28 minutes later at 8:25 PM on June 29.

Daylight saving time (DST) is observed in Swansboro during 2017, starting in the spring on March 12, lasting 7.8 months, and ending in the fall on November 5.

Sunrise & Sunset with Twilight and Daylight Saving Time

The solar day over the course of the year 2017. 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.

Clouds

In Swansboro, 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 Swansboro begins around September 13 and lasts for 2.9 months, ending around December 10. On October 27, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 64% of the time, and overcast or mostly cloudy 36% of the time.

The cloudier part of the year begins around December 10 and lasts for 9.1 months, ending around September 13. On July 26, the cloudiest day of the year, the sky is overcast or mostly cloudy 56% of the time, and clear, mostly clear, or partly cloudy 44% of the time.

Cloud Cover

clearerclearercloudiercloudier0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJul 2656%Jul 2656%Oct 2736%Oct 2736%Sep 1346%Sep 1346%Dec 1046%Dec 1046%overcastovercastmostly cloudymostly cloudymostly clearmostly clearclearclear
The percentage of time spent in each cloud cover band, categorized by the percentage of the sky covered by clouds: clear < 20% < mostly clear < 40% < partly cloudy < 60% < mostly cloudy < 80% < overcast.

Precipitation

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Swansboro varies significantly throughout the year.

The wetter season lasts 3.3 months, from June 6 to September 16, with a greater than 37% chance of a given day being a wet day. The chance of a wet day peaks at 53% on July 25.

The drier season lasts 8.7 months, from September 16 to June 6. The smallest chance of a wet day is 20% on October 30.

Among wet days, we distinguish between those that experience rain alone, snow alone, or a mixture of the two. Based on this categorization, the most common form of precipitation throughout the year is rain alone, with a peak probability of 53% on July 25.

Daily Chance of Precipitation

The percentage of days in which various types of precipitation are observed, excluding trace quantities: rain alone, snow alone, and mixed (both rain and snow fell in the same day).

Rainfall

To 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 in the year. Swansboro experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Swansboro. The most rain falls during the 31 days centered around September 4, with an average total accumulation of 6.2 inches.

The least rain falls around November 9, with and average total accumulation of 3.1 inches.

Average Monthly Rainfall

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 liquid-equivalent snowfall.

Humidity

We 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.

Swansboro experiences very significant seasonal variation in the perceived humidity.

The muggier period of the year lasts for 5.2 months, from May 8 to October 15, during which time the comfort level is muggy, oppressive, or miserable at least 24% of the time. The muggiest day of the year is July 23, with muggy conditions 95% of the time.

The least muggy day of the year is February 11, when muggy conditions are essentially unheard of.

Humidity Comfort Levels

muggymuggy0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecFeb 110%Feb 110%95%Jul 2395%Jul 23May 825%May 825%Oct 1524%Oct 1524%miserablemiserableoppressiveoppressivecomfortablecomfortabledrydry
The percentage of time spent at various humidity comfort levels, categorized by dew point: dry < 55°F < comfortable < 60°F < humid < 65°F < muggy < 70°F < oppressive < 75°F < miserable.

Wind

This 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 Swansboro experiences mildly seasonal variation over the course of the year.

The windier part of the year lasts for 6.4 months, from October 28 to May 9, with average wind speeds of more than 5.7 miles per hour. The windiest day of the year is February 27, with an average hourly wind speed of 6.8 miles per hour.

The calmer time of year lasts for 5.6 months, from May 9 to October 28. The calmest day of the year is August 14, with an average hourly wind speed of 4.7 miles per hour.

Average Wind Speed

The average of mean hourly wind speeds (dark gray line), with 25th to 75th and 10th to 90th percentile bands.

The predominant average hourly wind direction in Swansboro varies throughout the year.

The wind is most often from the south for 5.1 months, from March 25 to August 28, with a peak percentage of 46% on July 10. The wind is most often from the east for 2.4 weeks, from August 28 to September 14, with a peak percentage of 32% on September 7. The wind is most often from the north for 6.4 months, from September 14 to March 25, with a peak percentage of 43% on November 10.

Wind Direction

NNSSEENN0%20%40%60%80%100%JanFebMarAprMayJunJulAugSepOctNovDecwestwestsouthsoutheasteastnorthnorth
The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions (north, east, south, and west), excluding hours in which the mean wind speed is less than 1 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 Temperature

Swansboro 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 some seasonal variation over the course of the year.

The time of year with warmer water lasts for 3.3 months, from June 18 to September 26, with an average temperature above 78°F. The day of the year with the warmest water is August 3, with an average temperature of 82°F.

The time of year with cooler water lasts for 4.2 months, from December 15 to April 22, with an average temperature below 66°F. The day of the year with the coolest water is February 24, with an average temperature of 62°F.

Average Water Temperature

The daily average water temperature (purple line) with percentile bands, with 25th to 75th and 10th to 90th percentile bands.

Solar Energy

This 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 significant seasonal variation over the course of the year.

The brighter period of the year lasts for 3.2 months, from April 9 to July 14, with an average daily incident shortwave energy per square meter above 5.8 kWh. The brightest day of the year is May 17, with an average of 6.6 kWh.

The darker period of the year lasts for 2.9 months, from November 11 to February 7, with an average daily incident shortwave energy per square meter below 3.4 kWh. The darkest day of the year is December 25, with an average of 2.5 kWh.

Average Daily Incident Shortwave Solar Energy

The average daily shortwave solar energy reaching the ground per square meter (orange line), with 25th to 75th and 10th to 90th percentile bands.

Topography

For the purposes of this report, the geographical coordinates of Swansboro are 34.688 deg latitude, -77.119 deg longitude, and 3 ft elevation.

The topography within 2 miles of Swansboro is essentially flat, with a maximum elevation change of 33 feet, and an average elevation above sea level of 10 feet. Within 10 miles is also essentially flat (52 feet). Within 50 miles contains only modest variations in elevation (164 feet).

The area within 2 miles of Swansboro is covered by water (39%), herbaceous vegetation (28%), and artificial surfaces (22%), within 10 miles by water (37%) and trees (29%), and within 50 miles by water (47%) and trees (27%).

Data Sources

This report illustrates the typical weather in Swansboro, based on a statistical analysis of historical hourly weather reports and model reconstructions from January 1, 1980 to December 31, 2016.

Temperature and Dew Point

There are 2 weather stations near enough to contribute to our estimation of the temperature and dew point in Swansboro.

For each station, the records are corrected for the elevation difference between that station and Swansboro 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 Swansboro is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Swansboro and a given station.

The stations contributing to this reconstruction are: Swansboro, Bogue Field, Marine Corps Auxiliary Landing Field (88%, 8 kilometers, east) and Jacksonville, New River, Marine Corps Air Station (12%, 29 kilometers, west).

Other Data

All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , 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 aiports and weather stations are provided by AskGeo.com .