Average Weather at Shelby Municipal Airport North Carolina, United States

At Shelby Municipal Airport, the summers are hot and muggy, the winters are chilly and wet, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 32°F to 89°F and is rarely below 19°F or above 95°F.

The hot season lasts for 3.7 months, from May 24 to September 15, with an average daily high temperature above 81°F. The hottest day of the year is July 20, with an average high of 89°F and low of 69°F.

The cold season lasts for 3.0 months, from November 27 to February 27, with an average daily high temperature below 59°F. The coldest day of the year is January 29, with an average low of 32°F and high of 51°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

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.

Clouds

At Shelby Municipal Airport, the average percentage of the sky covered by clouds experiences mild seasonal variation over the course of the year.

The clearer part of the year at Shelby Municipal Airport begins around August 1 and lasts for 3.7 months, ending around November 22. On October 8, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 66% of the time, and overcast or mostly cloudy 34% of the time.

The cloudier part of the year begins around November 22 and lasts for 8.3 months, ending around August 1. On January 4, the cloudiest day of the year, the sky is overcast or mostly cloudy 50% of the time, and clear, mostly clear, or partly cloudy 50% of the time.

Cloud Cover

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 at Shelby Municipal Airport varies throughout the year.

The wetter season lasts 3.6 months, from May 11 to August 29, with a greater than 32% chance of a given day being a wet day. The chance of a wet day peaks at 45% on July 27.

The drier season lasts 8.4 months, from August 29 to May 11. The smallest chance of a wet day is 19% 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 45% on July 27.

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 of the year. Shelby Municipal Airport experiences some seasonal variation in monthly rainfall.

Rain falls throughout the year at Shelby Municipal Airport. The most rain falls during the 31 days centered around March 21, with an average total accumulation of 3.7 inches.

The least rain falls around October 30, with an average total accumulation of 2.9 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.

Snowfall

We report snowfall in liquid-equivalent terms. The actual depth of new snowfall is typically between 5 and 10 times the liquid-equivalent amount, assuming the ground is frozen. Colder, drier snow tends to be on the higher end of that range and warmer, wetter snow on the lower end.

As with rainfall, we consider the snowfall accumulated over a sliding 31-day period centered around each day of the year. Shelby Municipal Airport experiences some seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 3.1 months, from December 6 to March 10, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around January 21, with an average total liquid-equivalent accumulation of 0.3 inches.

The snowless period of the year lasts for 8.9 months, from March 10 to December 6. The least snow falls around July 21, with an average total liquid-equivalent accumulation of 0.0 inches.

Average Liquid-Equivalent Monthly Snowfall

The average liquid-equivalent 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.

Sun

The length of the day at Shelby Municipal Airport varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 47 minutes of daylight; the longest day is June 21, with 14 hours, 32 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 6:11 AM on June 13, and the latest sunrise is 1 hour, 40 minutes later at 7:50 AM on November 4. The earliest sunset is at 5:13 PM on December 5, and the latest sunset is 3 hours, 31 minutes later at 8:45 PM on June 28.

Daylight saving time (DST) is observed at Shelby Municipal Airport 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.

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.

Shelby Municipal Airport experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 4.3 months, from May 22 to September 30, during which time the comfort level is muggy, oppressive, or miserable at least 21% of the time. The muggiest day of the year is July 24, with muggy conditions 80% of the time.

The least muggy day of the year is February 6, when muggy conditions are essentially unheard of.

Humidity Comfort Levels

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 at Shelby Municipal Airport experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 6.6 months, from October 31 to May 18, with average wind speeds of more than 2.9 miles per hour. The windiest day of the year is March 8, with an average hourly wind speed of 3.6 miles per hour.

The calmer time of year lasts for 5.4 months, from May 18 to October 31. The calmest day of the year is August 1, with an average hourly wind speed of 2.3 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 at Shelby Municipal Airport varies throughout the year.

The wind is most often from the north for 1.4 months, from February 6 to March 18 and for 3.5 months, from September 10 to December 27, with a peak percentage of 37% on October 15. The wind is most often from the west for 1.0 weeks, from March 21 to March 28; for 3.9 months, from April 11 to August 8; and for 1.2 months, from December 27 to February 6, with a peak percentage of 36% on July 5. The wind is most often from the east for 1.1 months, from August 8 to September 10, with a peak percentage of 33% on September 6.

Wind Direction

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).

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 4.3 months, from April 15 to August 25, with an average daily incident shortwave energy per square meter above 6.0 kWh. The brightest day of the year is June 23, with an average of 6.9 kWh.

The darker period of the year lasts for 2.9 months, from November 9 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 Shelby Municipal Airport are 35.255 deg latitude, -81.601 deg longitude, and 771 ft elevation.

The topography within 2 miles of Shelby Municipal Airport contains only modest variations in elevation, with a maximum elevation change of 220 feet and an average elevation above sea level of 763 feet. Within 10 miles contains only modest variations in elevation (597 feet). Within 50 miles contains significant variations in elevation (5,331 feet).

The area within 2 miles of Shelby Municipal Airport is covered by cropland (75%) and trees (25%), within 10 miles by cropland (49%) and trees (47%), and within 50 miles by trees (67%) and cropland (19%).

Data Sources

This report illustrates the typical weather at Shelby Municipal Airport, 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

Shelby Municipal Airport has a weather station that reported reliably enough during the analysis period that we have included it in our network. When available, historical temperature and dew point measurements are taken directly from this weather station. These records are obtained from NOAA's Integrated Surface Hourly data set, falling back on ICAO METAR records as required.

In the case of missing or erroneous measurements from this station, we fall back on records from nearby stations, adjusted according to typical seasonal and diurnal intra-station differences. For a given day of the year and hour of the day, the fallback station is selected to minimize the prediction error over the years for which there are measurements for both stations.

The stations on which we may fall back include but are not limited to Rutherford County Airport; Gastonia Municipal Airport; Spartanburg Downtown Memorial Airport; Lincolnton, Lincolnton-Lincoln County Regional Airport; Hickory Regional Airport; Foothills Regional Airport; Rock Hill, Rock Hill - York County Airport; and Chester Catawba Regional Airport.

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 .

Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.