Average Weather in Shelbyville Indiana, United States
In Shelbyville, the summers are long, warm, humid, and wet; the winters are chilly and windy; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 22°F to 85°F and is rarely below 4°F or above 92°F.
The warm season lasts for 4.2 months, from May 19 to September 24, with an average daily high temperature above 75°F. The hottest day of the year is July 19, with an average high of 85°F and low of 66°F.
The cold season lasts for 3.0 months, from December 1 to March 1, with an average daily high temperature below 46°F. The coldest day of the year is January 29, with an average low of 22°F and high of 37°F.
Average High and Low Temperature
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 Shelbyville, 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 Shelbyville begins around June 13 and lasts for 4.7 months, ending around November 3. On August 23, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 69% of the time, and overcast or mostly cloudy 31% of the time.
The cloudier part of the year begins around November 3 and lasts for 7.3 months, ending around June 13. On December 25, the cloudiest day of the year, the sky is overcast or mostly cloudy 60% of the time, and clear, mostly clear, or partly cloudy 40% of the time.
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Shelbyville varies throughout the year.
The wetter season lasts 4.8 months, from March 24 to August 19, with a greater than 31% chance of a given day being a wet day. The chance of a wet day peaks at 42% on June 8.
The drier season lasts 7.2 months, from August 19 to March 24. The smallest chance of a wet day is 20% on January 28.
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 42% on June 8.
Daily Chance of Precipitation
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. Shelbyville experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year in Shelbyville. The most rain falls during the 31 days centered around May 13, with an average total accumulation of 4.3 inches.
The least rain falls around February 4, with an average total accumulation of 1.8 inches.
Average Monthly Rainfall
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. Shelbyville experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 3.9 months, from November 25 to March 21, 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 1, with an average total liquid-equivalent accumulation of 0.4 inches.
The snowless period of the year lasts for 8.1 months, from March 21 to November 25. The least snow falls around July 13, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Shelbyville varies significantly over the course of the year. In 2017, the shortest day is December 21, with 9 hours, 23 minutes of daylight; the longest day is June 21, with 14 hours, 58 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 6:15 AM on June 14, and the latest sunrise is 1 hour, 60 minutes later at 8:15 AM on November 4. The earliest sunset is at 5:19 PM on December 7, and the latest sunset is 3 hours, 55 minutes later at 9:14 PM on June 27.
Daylight saving time (DST) is observed in Shelbyville 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
Shelbyville experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 3.9 months, from May 24 to September 21, during which time the comfort level is muggy, oppressive, or miserable at least 15% of the time. The muggiest day of the year is July 22, with muggy conditions 60% of the time.
The least muggy day of the year is January 30, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
The average hourly wind speed in Shelbyville experiences mild seasonal variation over the course of the year.
The windier part of the year lasts for 7.4 months, from October 11 to May 22, with average wind speeds of more than 4.8 miles per hour. The windiest day of the year is April 1, with an average hourly wind speed of 6.2 miles per hour.
The calmer time of year lasts for 4.6 months, from May 22 to October 11. The calmest day of the year is July 31, with an average hourly wind speed of 3.5 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Shelbyville varies throughout the year.
The wind is most often from the south for 2.9 months, from April 1 to June 29; for 4.0 days, from August 14 to August 18; and for 3.3 months, from August 26 to December 3, with a peak percentage of 38% on November 14. The wind is most often from the west for 1.5 months, from June 29 to August 14 and for 3.9 months, from December 3 to April 1, with a peak percentage of 34% on July 20. The wind is most often from the east for 1.1 weeks, from August 18 to August 26, with a peak percentage of 27% on August 21.
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 4.1 months, from April 29 to August 31, with an average daily incident shortwave energy per square meter above 5.8 kWh. The brightest day of the year is July 2, with an average of 6.8 kWh.
The darker period of the year lasts for 3.2 months, from November 5 to February 10, with an average daily incident shortwave energy per square meter below 2.8 kWh. The darkest day of the year is December 18, with an average of 1.8 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Shelbyville are 39.521 deg latitude, -85.777 deg longitude, and 771 ft elevation.
The topography within 2 miles of Shelbyville is essentially flat, with a maximum elevation change of 62 feet and an average elevation above sea level of 768 feet. Within 10 miles is essentially flat (246 feet). Within 50 miles contains only modest variations in elevation (886 feet).
The area within 2 miles of Shelbyville is covered by artificial surfaces (59%) and cropland (39%), within 10 miles by cropland (97%), and within 50 miles by cropland (67%) and trees (24%).
This report illustrates the typical weather in Shelbyville, 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 5 weather stations near enough to contribute to our estimation of the temperature and dew point in Shelbyville.
For each station, the records are corrected for the elevation difference between that station and Shelbyville 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 Shelbyville is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Shelbyville and a given station.
The stations contributing to this reconstruction are: Shelbyville Municipal Airport (94%, 7 kilometers, north); Monroe County Airport (2.1%, 84 kilometers, southwest); Cincinnati/Northern Kentucky International Airport (1.4%, 109 kilometers, southeast); Butler County Regional Airport (1.4%, 109 kilometers, east); and Bowman Field (1.0%, 144 kilometers, south).
Time zones for aiports and weather stations are provided by AskGeo.com .