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Average Weather in Indianapolis


 Indianapolis Weather Updates

Temperature

The hot season lasts for 3.9 months, from May 22 to September 20, with an average daily high temperature above 75°F. The hottest day of the year is July 18, with an average high of 85°F and low of 68°F.



The cold season lasts for 3.0 months, from November 30 to February 29, 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 36°F.


Clouds

In Indianapolis, 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 Indianapolis begins around June 13 and lasts for 4.5 months, ending around October 30. On August 22, the clearest day of the year, the sky is clear, mostly clear, or partly cloudy 70% of the time, and overcast or mostly cloudy 30% of the time.



The cloudier part of the year begins around October 30 and lasts for 7.4 months, ending around June 13. On December 27, the cloudiest day of the year, the sky is overcast or mostly cloudy 59% of the time, and clear, mostly clear, or partly cloudy 41% of the time.


Precipitation

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


The wetter season lasts 4.8 months, from March 25 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 42% on June 7.


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. Indianapolis experiences significant seasonal variation in monthly rainfall.



Rain falls throughout the year in Indianapolis. The most rain falls during the 31 days centered around May 24, with an average total accumulation of 4.2 inches.


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. Indianapolis experiences some seasonal variation in monthly liquid-equivalent snowfall.


The snowy period of the year lasts for 4.0 months, from November 24 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 1, with an average total liquid-equivalent accumulation of 0.4 inches.



The snowless period of the year lasts for 8.0 months, from March 23 to November 24. The least snow falls around July 17, with an average total liquid-equivalent accumulation of 0.0 inches.


Sun

The length of the day in Indianapolis varies significantly over the course of the year. In 2020, the shortest day is December 21, with 9 hours, 21 minutes of daylight; the longest day is June 20, with 14 hours, 59 minutes of daylight.



The earliest sunrise is at 6:15 AM on June 13, and the latest sunrise is 1 hour, 57 minutes later at 8:12 AM on October 31. The earliest sunset is at 5:19 PM on December 7, and the latest sunset is 3 hours, 57 minutes later at 9:16 PM on June 27.


Moon

The figure below presents a compact representation of key lunar data for 2020. The horizontal axis is the day, the vertical axis is the hour of the day, and the colored areas indicate when the moon is above the horizon. The vertical gray bars (new Moons) and blue bars (full Moons) indicate key Moon phases.




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.

Indianapolis 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 14% of the time. The muggiest day of the year is July 21, with muggy conditions 56% of the time.


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 Indianapolis experiences significant seasonal variation over the course of the year.



The windier part of the year lasts for 7.3 months, from October 10 to May 21, with average wind speeds of more than 8.9 miles per hour. The windiest day of the year is March 31, with an average hourly wind speed of 11.4 miles per hour.


The calmer time of year lasts for 4.7 months, from May 21 to October 10. The calmest day of the year is July 30, with an average hourly wind speed of 6.5 miles per hour.


The wind is most often from the south for 3.0 months, from March 31 to June 29 and for 3.6 months, from August 13 to December 1, with a peak percentage of 38% on November 13. The wind is most often from the west for 1.5 months, from June 29 to August 13 and for 4.0 months, from December 1 to March 31, with a peak percentage of 34% on July 19.


Best Time of Year to Visit

To characterize how pleasant the weather is in Indianapolis throughout the year, we compute two travel scores.


The tourism score favors clear, rain less days with perceived temperatures between 65°F and 80°F. Based on this score, the best time of year to visit Indianapolis for general outdoor tourist activities is from mid June to mid September, with a peak score in the last week of August.

Methodology

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.


Growing Season

Definitions of the growing season vary throughout the world, but for the purposes of this report, we define it as the longest continuous period of non-freezing temperatures (≥ 32°F) in the year (the calendar year in the Northern Hemisphere, or from July 1 until June 30 in the Southern Hemisphere).


The growing season in Indianapolis typically lasts for 6.5 months (200 days), from around April 7 to around October 25, rarely starting before March 22 or after April 24, and rarely ending before October 3 or after November 14.




Growing degree days are a measure of yearly heat accumulation used to predict plant and animal development, and defined as the integral of warmth above a base temperature, discarding any excess above a maximum temperature. In this report, we use a base of 50°F and a cap of 86°F.


Based on growing degree days alone, the first spring blooms in Indianapolis should appear around March 28, only rarely appearing before March 12 or after April 13.


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 extreme seasonal variation over the course of the year.


The brighter period of the year lasts for 4.0 months, from April 29 to August 28, with an average daily incident shortwave energy per square meter above 5.8 kWh. The brightest day of the year is July 1, with an average of 6.8 kWh.



The darker period of the year lasts for 3.2 months, from November 4 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 16, with an average of 1.8 kWh.



Topography


For the purposes of this report, the geographical coordinates of Indianapolis are 39.768 deg latitude, -86.158 deg longitude, and 712 ft elevation.


The topography within 2 miles of Indianapolis is essentially flat, with a maximum elevation change of 89 feet and an average elevation above sea level of 711 feet. Within 10 miles is essentially flat (564 feet). Within 50 miles contains significant variations in elevation (840 feet).


The area within 2 miles of Indianapolis is covered by artificial surfaces (100%), within 10 miles by artificial surfaces (87%), and within 50 miles by cropland (74%) and trees (17%).


Data Sources

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



Source : https://weatherspark.com/y/14754/Average-Weather-in-Indianapolis-Indiana-United-States-Year-Round

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