Average Weather at University of Illinois Willard Airport Illinois, United States
At University of Illinois Willard Airport, the summers are long, warm, humid, and wet; the winters are freezing and windy; and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 19°F to 85°F and is rarely below 1°F or above 93°F.
Based on the tourism score, the best time of year to visit University of Illinois Willard Airport for warm-weather activities is from mid June to mid September.
The warm season lasts for 4.3 months, from May 16 to September 25, 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 65°F.
The cold season lasts for 3.0 months, from December 1 to March 1, with an average daily high temperature below 44°F. The coldest day of the year is January 29, with an average low of 19°F and high of 34°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
Bucharest, Romania (5,327 miles away); Uzgen, Kyrgyzstan (6,742 miles); and Seongnam-si, South Korea (6,639 miles) are the far-away foreign places with temperatures most similar to University of Illinois Willard Airport (view comparison).
At University of Illinois Willard Airport, 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 at University of Illinois Willard Airport begins around June 14 and lasts for 4.5 months, ending around October 29. On August 26, 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 29 and lasts for 7.5 months, ending around June 14. On December 28, 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 Categories
0% clear 20% mostly clear 40% partly cloudy 60% mostly cloudy 80% overcast 100%
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. The chance of wet days at University of Illinois Willard Airport varies throughout the year.
The wetter season lasts 5.4 months, from March 25 to September 8, with a greater than 28% chance of a given day being a wet day. The chance of a wet day peaks at 40% on May 26.
The drier season lasts 6.5 months, from September 8 to March 25. The smallest chance of a wet day is 16% 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 40% on May 26.
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. University of Illinois Willard Airport experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year at University of Illinois Willard Airport. The most rain falls during the 31 days centered around June 2, with an average total accumulation of 3.9 inches.
The least rain falls around January 27, with an average total accumulation of 1.2 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. University of Illinois Willard Airport experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 4.3 months, from November 16 to March 27, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around December 26, with an average total liquid-equivalent accumulation of 0.4 inches.
The snowless period of the year lasts for 7.7 months, from March 27 to November 16. The least snow falls around July 18, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day at University of Illinois Willard Airport varies significantly over the course of the year. In 2018, the shortest day is December 21, with 9 hours, 19 minutes of daylight; the longest day is June 21, with 15 hours, 1 minute of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:23 AM on June 14, and the latest sunrise is 2 hours, 1 minute later at 7:24 AM on November 3. The earliest sunset is at 4:27 PM on December 6, and the latest sunset is 3 hours, 59 minutes later at 8:26 PM on June 27.
Daylight saving time (DST) is observed at University of Illinois Willard Airport during 2018, starting in the spring on March 11, lasting 7.8 months, and ending in the fall on November 4.
Sunrise & Sunset with Twilight and Daylight Saving Time
University of Illinois Willard Airport experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 3.8 months, from May 27 to September 19, 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 21, with muggy conditions 59% of the time.
The least muggy day of the year is December 19, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
dry 55°F comfortable 60°F humid 65°F muggy 70°F oppressive 75°F miserable
The average hourly wind speed at University of Illinois Willard Airport experiences significant seasonal variation over the course of the year.
The windier part of the year lasts for 7.5 months, from October 10 to May 26, with average wind speeds of more than 10.0 miles per hour. The windiest day of the year is April 1, with an average hourly wind speed of 12.7 miles per hour.
The calmer time of year lasts for 4.5 months, from May 26 to October 10. The calmest day of the year is July 31, with an average hourly wind speed of 7.2 miles per hour.
Average Wind Speed
The predominant average hourly wind direction at University of Illinois Willard Airport varies throughout the year.
The wind is most often from the south for 8.7 months, from March 11 to December 3, with a peak percentage of 38% on November 8. The wind is most often from the west for 3.3 months, from December 3 to March 11, with a peak percentage of 38% on January 1.
Best Time of Year to Visit
To characterize how pleasant the weather is at University of Illinois Willard Airport 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 University of Illinois Willard Airport 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 University of Illinois Willard Airport 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 at University of Illinois Willard Airport typically lasts for 6.0 months (184 days), from around April 15 to around October 16, rarely starting before March 30 or after May 2, and rarely ending before September 26 or after November 2.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms at University of Illinois Willard Airport should appear around April 3, only rarely appearing before March 19 or after April 19.
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 28, 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 5 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 17, with an average of 1.9 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of University of Illinois Willard Airport are 40.039 deg latitude, -88.278 deg longitude, and 725 ft elevation.
The topography within 2 miles of University of Illinois Willard Airport is essentially flat, with a maximum elevation change of 72 feet and an average elevation above sea level of 731 feet. Within 10 miles is essentially flat (203 feet). Within 50 miles also contains only modest variations in elevation (482 feet).
The area within 2 miles of University of Illinois Willard Airport is covered by cropland (91%), within 10 miles by cropland (89%) and artificial surfaces (11%), and within 50 miles by cropland (92%).
This report illustrates the typical weather at University of Illinois Willard 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
University of Illinois Willard 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 Rantoul, Rantoul National Aviation Center Airport-Frank Elliott Field; Coles County Memorial Airport; Decatur Airport; Vermilion County Airport; Edgar County Airport; Central Illinois Regional Airport at Bloomington-Normal; Pontiac, Pontiac Municipal Airport; and Logan County Airport.
Time zones for aiports and weather stations are provided by AskGeo.com .