Average Weather in June in Valmeyer Illinois, United States
Daily high temperatures increase by 7°F, from 80°F to 88°F, rarely falling below 71°F or exceeding 95°F.
Daily low temperatures increase by 7°F, from 61°F to 68°F, rarely falling below 52°F or exceeding 75°F.
For reference, on July 21, the hottest day of the year, temperatures in Valmeyer typically range from 70°F to 89°F, while on January 22, the coldest day of the year, they range from 25°F to 41°F.
Average High and Low Temperature in June
The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on June. The horizontal axis is the day, 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 June
The month of June in Valmeyer experiences decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 47% to 37%.
The clearest day of the month is June 30, with clear, mostly clear, or partly cloudy conditions 63% of the time.
For reference, on February 12, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 54%, while on August 27, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 71%.
Cloud Cover Categories in June
A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. In Valmeyer, the chance of a wet day over the course of June is gradually decreasing, starting the month at 38% and ending it at 36%.
For reference, the year's highest daily chance of a wet day is 40% on May 24, and its lowest chance is 16% on January 27.
Probability of Precipitation in June
To show variation within the month and not just the monthly total, we show the rainfall accumulated over a sliding 31-day period centered around each day.
The average sliding 31-day rainfall during June in Valmeyer is gradually decreasing, starting the month at 3.9 inches, when it rarely exceeds 6.6 inches or falls below 1.4 inches, and ending the month at 3.4 inches, when it rarely exceeds 5.8 inches or falls below 1.5 inches.
Average Monthly Rainfall in June
Over the course of June in Valmeyer, the length of the day is essentially constant. The shortest day of the month is June 1, with 14 hours, 40 minutes of daylight and the longest day is June 21, with 14 hours, 50 minutes of daylight.
Hours of Daylight and Twilight in June
The earliest sunrise of the month in Valmeyer is 5:37 AM on June 13 and the latest sunrise is 4 minutes later at 5:40 AM on June 30.
The earliest sunset is 8:18 PM on June 1 and the latest sunset is 10 minutes later at 8:28 PM on June 28.
Daylight saving time is observed in Valmeyer during 2018, but it neither starts nor ends during June, so the entire month is in daylight saving time.
For reference, on June 21, the longest day of the year, the Sun rises at 5:37 AM and sets 14 hours, 50 minutes later, at 8:28 PM, while on December 21, the shortest day of the year, it rises at 7:14 AM and sets 9 hours, 30 minutes later, at 4:44 PM.
Sunrise & Sunset with Twilight in June
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.
The chance that a given day will be muggy in Valmeyer is very rapidly increasing during June, rising from 32% to 63% over the course of the month.
For reference, on July 23, the muggiest day of the year, there are muggy conditions 72% of the time, while on January 1, the least muggy day of the year, there are muggy conditions 0% of the time.
Humidity Comfort Levels in June
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 Valmeyer is gradually decreasing during June, decreasing from 6.2 miles per hour to 5.3 miles per hour over the course of the month.
For reference, on February 26, the windiest day of the year, the daily average wind speed is 8.6 miles per hour, while on July 27, the calmest day of the year, the daily average wind speed is 4.9 miles per hour.
Average Wind Speed in June
Wind Direction in June
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 Valmeyer typically lasts for 6.7 months (204 days), from around April 6 to around October 27, rarely starting before March 19 or after April 22, and rarely ending before October 8 or after November 14.
The month of June in Valmeyer is reliably fully within the growing season.
Time Spent in Various Temperature Bands and the Growing Season in June
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.
The average accumulated growing degree days in Valmeyer are rapidly increasing during June, increasing by 693°F, from 916°F to 1,608°F, over the course of the month.
Growing Degree Days in June
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 in Valmeyer is essentially constant during June, remaining within 0.2 kWh of 6.7 kWh throughout.
Average Daily Incident Shortwave Solar Energy in June
For the purposes of this report, the geographical coordinates of Valmeyer are 38.306 deg latitude, -90.277 deg longitude, and 617 ft elevation.
The topography within 2 miles of Valmeyer contains only modest variations in elevation, with a maximum elevation change of 427 feet and an average elevation above sea level of 622 feet. Within 10 miles contains only modest variations in elevation (522 feet). Within 50 miles contains significant variations in elevation (1,490 feet).
The area within 2 miles of Valmeyer is covered by cropland (50%) and trees (42%), within 10 miles by cropland (54%) and trees (28%), and within 50 miles by trees (43%) and cropland (42%).
This report illustrates the typical weather in Valmeyer year round, 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 4 weather stations near enough to contribute to our estimation of the temperature and dew point in Valmeyer.
For each station, the records are corrected for the elevation difference between that station and Valmeyer 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 Valmeyer is computed as the weighted average of the individual contributions from each station, with weights proportional to the inverse of the distance between Valmeyer and a given station.
The stations contributing to this reconstruction are: Saint Louis Downtown - Parks Airport (43%, 31 kilometers, north); Spirit of St Louis Airport (21%, 51 kilometers, northwest); Sparta Community Airport-Hunter Field (20%, 53 kilometers, east); and Farmington Regional Airport (16%, 62 kilometers, south).
All data relating to the Sun's position (e.g., sunrise and sunset) are computed using astronomical formulas from the book, Astronomical Tables of the Sun, Moon and Planets , by Jean Meeus.
All other weather data, including cloud cover, precipitation, wind speed and direction, and solar flux, come from NASA's MERRA-2 Modern-Era Retrospective Analysis . This reanalysis combines a variety of wide-area measurements in a state-of-the-art global meteorological model to reconstruct the hourly history of weather throughout the world on a 50-kilometer grid.
Land Use data comes from the Global Land Cover SHARE database , published by the Food and Agriculture Organization of the United Nations.
Elevation data comes from the Shuttle Radar Topography Mission (SRTM) , published by NASA's Jet Propulsion Laboratory.
Names, locations, and time zones of places and some airports come from the GeoNames Geographical Database .
Time zones for aiports and weather stations are provided by AskGeo.com .
Maps are © Esri, with data from National Geographic, Esri, DeLorme, NAVTEQ, UNEP-WCMC, USGS, NASA, ESA, METI, NRCAN, GEBCO, NOAA, and iPC.
The information on this site is provided as is, without any assurances as to its accuracy or suitability for any purpose. Weather data is prone to errors, outages, and other defects. We assume no responsibility for any decisions made on the basis of the content presented on this site.
We draw particular cautious attention to our reliance on the MERRA-2 model-based reconstructions for a number of important data series. While having the tremendous advantages of temporal and spatial completeness, these reconstructions: (1) are based on computer models that may have model-based errors, (2) are coarsely sampled on a 50 km grid and are therefore unable to reconstruct the local variations of many microclimates, and (3) have particular difficulty with the weather in some coastal areas, especially small islands.
We further caution that our travel scores are only as good as the data that underpin them, that weather conditions at any given location and time are unpredictable and variable, and that the definition of the scores reflects a particular set of preferences that may not agree with those of any particular reader.