Average Weather at Salem-Leckrone Airport Illinois, United States
At Salem-Leckrone Airport, the summers are warm and humid, the winters are very cold and windy, and it is partly cloudy year round. Over the course of the year, the temperature typically varies from 25°F to 88°F and is rarely below 9°F or above 95°F.
Based on the tourism score, the best times of year to visit Salem-Leckrone Airport for warm-weather activities are from late May to early July and from early July to late September.
The hot season lasts for 3.8 months, from May 26 to September 21, with an average daily high temperature above 78°F. The hottest day of the year is July 20, with an average high of 88°F and low of 69°F.
The cold season lasts for 3.0 months, from November 30 to February 28, with an average daily high temperature below 49°F. The coldest day of the year is January 22, with an average low of 25°F and high of 40°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
At Salem-Leckrone 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 Salem-Leckrone Airport begins around June 15 and lasts for 4.5 months, ending around October 30. On August 23, 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 7.5 months, ending around June 15. On February 12, the cloudiest day of the year, the sky is overcast or mostly cloudy 54% of the time, and clear, mostly clear, or partly cloudy 46% 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 at Salem-Leckrone Airport varies throughout the year.
The wetter season lasts 4.9 months, from March 22 to August 20, with a greater than 29% chance of a given day being a wet day. The chance of a wet day peaks at 40% on June 7.
The drier season lasts 7.1 months, from August 20 to March 22. The smallest chance of a wet day is 18% 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 June 7.
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. Salem-Leckrone Airport experiences significant seasonal variation in monthly rainfall.
Rain falls throughout the year at Salem-Leckrone Airport. The most rain falls during the 31 days centered around May 9, with an average total accumulation of 4.2 inches.
The least rain falls around January 26, with an average total accumulation of 1.9 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. Salem-Leckrone Airport experiences some seasonal variation in monthly liquid-equivalent snowfall.
The snowy period of the year lasts for 3.3 months, from December 3 to March 13, with a sliding 31-day liquid-equivalent snowfall of at least 0.1 inches. The most snow falls during the 31 days centered around January 28, with an average total liquid-equivalent accumulation of 0.3 inches.
The snowless period of the year lasts for 8.7 months, from March 13 to December 3. The least snow falls around July 25, with an average total liquid-equivalent accumulation of 0.0 inches.
Average Liquid-Equivalent Monthly Snowfall
The length of the day at Salem-Leckrone Airport varies significantly over the course of the year. In 2018, the shortest day is December 21, with 9 hours, 28 minutes of daylight; the longest day is June 21, with 14 hours, 52 minutes of daylight.
Hours of Daylight and Twilight
The earliest sunrise is at 5:30 AM on June 13, and the latest sunrise is 1 hour, 54 minutes later at 7:24 AM on November 3. The earliest sunset is at 4:34 PM on December 7, and the latest sunset is 3 hours, 50 minutes later at 8:24 PM on June 27.
Daylight saving time (DST) is observed at Salem-Leckrone 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
Salem-Leckrone Airport experiences extreme seasonal variation in the perceived humidity.
The muggier period of the year lasts for 4.0 months, from May 23 to September 21, 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 23, with muggy conditions 68% of the time.
The least muggy day of the year is December 27, when muggy conditions are essentially unheard of.
Humidity Comfort Levels
The average hourly wind speed at Salem-Leckrone 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 25, with average wind speeds of more than 9.4 miles per hour. The windiest day of the year is April 1, with an average hourly wind speed of 12.0 miles per hour.
The calmer time of year lasts for 4.5 months, from May 25 to October 10. The calmest day of the year is July 31, with an average hourly wind speed of 6.8 miles per hour.
Average Wind Speed
The predominant average hourly wind direction at Salem-Leckrone Airport varies throughout the year.
The wind is most often from the west for 1.4 months, from January 1 to February 13, with a peak percentage of 32% on January 12. The wind is most often from the north for 5.0 days, from February 13 to February 18 and for 6.0 days, from March 6 to March 12, with a peak percentage of 30% on March 11. The wind is most often from the south for 2.3 weeks, from February 18 to March 6 and for 9.6 months, from March 12 to January 1, with a peak percentage of 42% on June 21.
Best Time of Year to Visit
To characterize how pleasant the weather is at Salem-Leckrone 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 times of year to visit Salem-Leckrone Airport for general outdoor tourist activities are from late May to early July and from early July to late September, with a peak score in the first week of September.
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 Salem-Leckrone Airport for hot-weather activities is from mid 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 Salem-Leckrone Airport typically lasts for 6.9 months (210 days), from around April 1 to around October 29, rarely starting before March 15 or after April 19, and rarely ending before October 6 or after November 20.
Time Spent in Various Temperature Bands and the Growing Season
Based on growing degree days alone, the first spring blooms at Salem-Leckrone Airport should appear around March 20, only rarely appearing before March 5 or after April 7.
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 4.2 months, from April 24 to August 30, 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 3.0 months, from November 7 to February 8, with an average daily incident shortwave energy per square meter below 3.0 kWh. The darkest day of the year is December 23, with an average of 2.0 kWh.
Average Daily Incident Shortwave Solar Energy
For the purposes of this report, the geographical coordinates of Salem-Leckrone Airport are 38.643 deg latitude, -88.964 deg longitude, and 551 ft elevation.
The topography within 2 miles of Salem-Leckrone Airport is essentially flat, with a maximum elevation change of 66 feet and an average elevation above sea level of 553 feet. Within 10 miles is essentially flat (197 feet). Within 50 miles also contains only modest variations in elevation (449 feet).
The area within 2 miles of Salem-Leckrone Airport is covered by cropland (59%) and artificial surfaces (35%), within 10 miles by cropland (77%) and trees (21%), and within 50 miles by cropland (82%) and trees (15%).
This report illustrates the typical weather at Salem-Leckrone 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
Salem-Leckrone 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 Centralia Municipal Airport, Mount Vernon Airport, Flora Municipal Airport, Fairfield Municipal Airport, Olney-Noble Airport, Litchfield Municipal Airport, Sparta Community Airport-Hunter Field, and Flying L Airport.
Time zones for aiports and weather stations are provided by AskGeo.com .