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Average Weather in Fern Creek Kentucky, United States

In Fern Creek, the summers are long, warm, and humid; the winters are chilly and wet; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 27°F to 87°F and is rarely below 11°F or above 93°F.

The hot season lasts for 3.9 months, from May 25 to September 21, with an average daily high temperature above 78°F. The hottest day of the year is July 21, with an average high of 87°F and low of 70°F.

The cold season lasts for 3.0 months, from November 29 to February 28, with an average daily high temperature below 51°F. The coldest day of the year is January 29, with an average low of 27°F and high of 42°F.

Average High and Low Temperature

The daily average high (red line) and low (blue line) temperature, 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

Average Hourly Temperature in Fern Creek12 AM4 AM8 AM12 PM4 PM8 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDecfreezingchillycoldcoolcomfortablewarmhot
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

In Fern Creek, 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 Fern Creek begins around June 14 and lasts for 4.8 months, ending around November 7. On August 23, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 68% of the time, and overcast or mostly cloudy 32% of the time.

The cloudier part of the year begins around November 7 and lasts for 7.2 months, ending around June 14. On January 2, the cloudiest day of the year, the sky is overcast or mostly cloudy 57% of the time, and clear, mostly clear, or partly cloudy 43% of the time.

Cloud Cover

Cloud Cover in Fern Creekclearercloudiercloudier0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJan 257%Jan 257%Aug 2332%Aug 2332%Jun 1445%Jun 1445%Nov 745%Nov 745%overcastmostly cloudypartly cloudymostly clearclear
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 Fern Creek varies throughout the year.

The wetter season lasts 4.7 months, from March 18 to August 10, with a greater than 32% chance of a given day being a wet day. The chance of a wet day peaks at 41% on May 12.

The drier season lasts 7.3 months, from August 10 to March 18. The smallest chance of a wet day is 23% on January 13.

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 41% on May 12.

Daily Chance of Precipitation

Daily Chance of Precipitation in Fern Creekwetdrydry0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecMay 1241%May 1241%Jan 1323%Jan 1323%Jan 126%Jan 126%Mar 1832%Mar 1832%Aug 1032%Aug 1032%mixedrain
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. Fern Creek experiences significant seasonal variation in monthly rainfall.

Rain falls throughout the year in Fern Creek. The most rain falls during the 31 days centered around May 4, with an average total accumulation of 4.7 inches.

The least rain falls around January 25, with an average total accumulation of 2.6 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. Fern Creek experiences some seasonal variation in monthly liquid-equivalent snowfall.

The snowy period of the year lasts for 3.5 months, from November 30 to March 15, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around February 4, with an average total liquid-equivalent accumulation of 0.3 inches.

The snowless period of the year lasts for 8.5 months, from March 15 to November 30. The least snow falls around July 20, with an average total liquid-equivalent accumulation of 0.0 inches.

Average Liquid-Equivalent Monthly Snowfall

Average Liquid-Equivalent Monthly Snowfall in Fern Creeksnowsnow0 in1 in2 in3 in4 in5 inJanFebMarAprMayJunJulAugSepOctNovDecFeb 40.3 inFeb 40.3 inJul 200.0 inJul 200.0 inNov 300.1 inNov 300.1 inMar 150.1 inMar 150.1 in
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 in Fern Creek varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 31 minutes of daylight; the longest day is June 21, with 14 hours, 49 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 6:18 AM on June 13, and the latest sunrise is 1 hour, 53 minutes later at 8:11 AM on November 4. The earliest sunset is at 5:22 PM on December 6, and the latest sunset is 3 hours, 47 minutes later at 9:09 PM on June 28.

Daylight saving time (DST) is observed in Fern Creek 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

Sunrise & Sunset with Twilight and Daylight Saving Time in Fern Creek2 AM4 AM6 AM8 AM10 AM12 PM2 PM4 PM6 PM8 PM10 PM12 AMJanFebMarAprMayJunJulAugSepOctNovDecJun 136:18 AMJun 136:18 AM9:09 PMJun 289:09 PMJun 28Dec 65:22 PMDec 65:22 PM8:11 AMNov 48:11 AMNov 4Mar 12DSTMar 12DSTDSTNov 5DSTNov 5daynightnightnightnight
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.

Fern Creek experiences extreme seasonal variation in the perceived humidity.

The muggier period of the year lasts for 4.1 months, from May 20 to September 23, during which time the comfort level is muggy, oppressive, or miserable at least 17% of the time. The muggiest day of the year is July 24, with muggy conditions 66% of the time.

The least muggy day of the year is January 30, when muggy conditions are essentially unheard of.

Humidity Comfort Levels

Humidity Comfort Levels in Fern Creekmuggy0%10%20%30%40%50%60%70%80%90%100%JanFebMarAprMayJunJulAugSepOctNovDecJan 300%Jan 300%Jul 2466%Jul 2466%May 2017%May 2017%Sep 2318%Sep 2318%oppressiveoppressivemuggymuggyhumidhumidcomfortablecomfortabledrydrymiserablemiserable
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 Fern Creek experiences mild seasonal variation over the course of the year.

The windier part of the year lasts for 6.9 months, from October 20 to May 17, with average wind speeds of more than 3.9 miles per hour. The windiest day of the year is February 25, with an average hourly wind speed of 5.0 miles per hour.

The calmer time of year lasts for 5.1 months, from May 17 to October 20. The calmest day of the year is August 1, with an average hourly wind speed of 2.8 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 Fern Creek varies throughout the year.

The wind is most often from the south for 3.4 months, from March 13 to June 25 and for 4.3 months, from August 14 to December 22, with a peak percentage of 40% on November 14. The wind is most often from the west for 1.6 months, from June 25 to August 14 and for 2.7 months, from December 22 to March 13, with a peak percentage of 36% on July 13.

Wind Direction

Wind Direction in Fern CreekWSWS0%20%40%60%80%100%JanFebMarAprMayJunJulAugSepOctNovDecwestsoutheastnorth
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 4.4 months, from April 22 to September 3, with an average daily incident shortwave energy per square meter above 5.7 kWh. The brightest day of the year is July 2, with an average of 6.7 kWh.

The darker period of the year lasts for 3.0 months, from November 8 to February 9, with an average daily incident shortwave energy per square meter below 2.9 kWh. The darkest day of the year is December 23, with an average of 2.0 kWh.

Average Daily Incident Shortwave Solar Energy

Average Daily Incident Shortwave Solar Energy in Fern Creekbrightdarkdark0 kWh1 kWh2 kWh3 kWh4 kWh5 kWh6 kWh7 kWh8 kWh9 kWhJanFebMarAprMayJunJulAugSepOctNovDecJul 26.7 kWhJul 26.7 kWhDec 232.0 kWhDec 232.0 kWhApr 225.7 kWhApr 225.7 kWhSep 35.7 kWhSep 35.7 kWhNov 82.9 kWhNov 82.9 kWhFeb 92.9 kWhFeb 92.9 kWh
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 Fern Creek are 38.160 deg latitude, -85.588 deg longitude, and 663 ft elevation.

The topography within 2 miles of Fern Creek contains only modest variations in elevation, with a maximum elevation change of 203 feet and an average elevation above sea level of 678 feet. Within 10 miles contains only modest variations in elevation (512 feet). Within 50 miles contains significant variations in elevation (866 feet).

The area within 2 miles of Fern Creek is covered by artificial surfaces (79%) and trees (13%), within 10 miles by artificial surfaces (53%) and trees (25%), and within 50 miles by cropland (48%) and trees (44%).

Data Sources

This report illustrates the typical weather in Fern Creek, 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 Fern Creek.

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

The stations contributing to this reconstruction are: Bowman Field (93%, 10 kilometers, northwest) and Capital City Airport (7%, 60 kilometers, east).

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.