Average Weather in Brookville Indiana, United States
In Brookville, the summers are long, warm, and humid; the winters are short, very cold, and windy; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 23°F to 84°F and is rarely below 5°F or above 91°F.
Based on the tourism score, the best time of year to visit Brookville for warm-weather activities is from mid June to mid September.
The warm season lasts for 4.0 months, from May 23 to September 22, with an average daily high temperature above 75°F. The hottest day of the year is July 20, with an average high of 84°F and low of 67°F.
The cold season lasts for 3.0 months, from December 1 to March 1, with an average daily high temperature below 47°F. The coldest day of the year is January 29, with an average low of 23°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 Brookville, 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 Brookville begins around June 13 and lasts for 4.7 months, ending around November 4. 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 4 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.
Cloud Cover Categories
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days in Brookville varies throughout the year.
The wetter season lasts 5.0 months, from March 18 to August 20, with a greater than 31% chance of a given day being a wet day. The chance of a wet day peaks at 41% on June 8.
The drier season lasts 7.0 months, from August 20 to March 18. 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 41% 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. Brookville experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year in Brookville. The most rain falls during the 31 days centered around May 7, with an average total accumulation of 4.2 inches.
The least rain falls around February 6, 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. Brookville experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 3.9 months, from November 27 to March 23, 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 0.4 inches.
The snowless period of the year lasts for 8.1 months, from March 23 to November 27. The least snow falls around July 16, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day in Brookville 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, 57 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 6:12 AM on June 14, and the latest sunrise is 1 hour, 59 minutes later at 8:11 AM on November 4. The earliest sunset is at 5:16 PM on December 7, and the latest sunset is 3 hours, 55 minutes later at 9:11 PM on June 27.
Daylight saving time (DST) is observed in Brookville 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
Brookville experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 3.8 months, from May 27 to September 21, during which time the comfort level is muggy, oppressive, or miserable at least 14% of the time. The muggiest day of the year is July 19, with muggy conditions 57% of the time.
The least muggy day of the year is February 12, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
The average hourly wind speed in Brookville experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 7.0 months, from October 17 to May 17, with average wind speeds of more than 8.3 miles per hour. The windiest day of the year is January 15, with an average hourly wind speed of 10.6 miles per hour.
The calmer time of year lasts for 5.0 months, from May 17 to October 17. The calmest day of the year is August 1, with an average hourly wind speed of 6.0 miles per hour.
Average Wind Speed
The predominant average hourly wind direction in Brookville varies throughout the year.
The wind is most often from the south for 1.7 months, from April 19 to June 9 and for 2.7 months, from September 5 to November 25, with a peak percentage of 37% on November 14. The wind is most often from the west for 2.4 months, from June 9 to August 20 and for 4.8 months, from November 25 to April 19, with a peak percentage of 38% on July 20. The wind is most often from the east for 2.3 weeks, from August 20 to September 5, with a peak percentage of 27% on September 2.
Best Time of Year to Visit
To characterize how pleasant the weather is in Brookville 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 Brookville for general outdoor tourist activities is from mid June to mid September, with a peak score in the last week of August.
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 Brookville for hot-weather activities is from late June to late August, with a peak score in the last week of July.
For 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.
The growing season in Brookville typically lasts for 6.3 months (193 days), from around April 13 to around October 22, rarely starting before March 28 or after April 29, and rarely ending before October 5 or after November 12.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms in Brookville should appear around March 28, only rarely appearing before March 12 or after April 12.
Growing Degree Days
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 4.0 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 3.1 months, from November 6 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 21, with an average of 1.8 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Brookville are 39.423 deg latitude, -85.013 deg longitude, and 817 ft elevation.
The topography within 2 miles of Brookville contains only modest variations in elevation, with a maximum elevation change of 440 feet and an average elevation above sea level of 774 feet. Within 10 miles contains only modest variations in elevation (518 feet). Within 50 miles contains significant variations in elevation (833 feet).
The area within 2 miles of Brookville is covered by trees (54%), cropland (22%), and artificial surfaces (18%), within 10 miles by cropland (50%) and trees (46%), and within 50 miles by cropland (63%) and trees (25%).
This report illustrates the typical weather in Brookville, 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 Brookville.
For each station, the records are corrected for the elevation difference between that station and Brookville 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 Brookville is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Brookville and a given station.
The stations contributing to this reconstruction are: Butler County Regional Airport (34%, 42 kilometers, east); Cincinnati/Northern Kentucky International Airport (26%, 51 kilometers, southeast); Shelbyville Municipal Airport (16%, 70 kilometers, west); Columbus Bakalar Municipal Airport (14%, 78 kilometers, west); and Delaware County Regional Airport (10%, 96 kilometers, north).
Time zones for aiports and weather stations are provided by AskGeo.com .