May Weather at Rochelle, Rochelle Municipal-Koritz Field Airport United States

Daily high temperatures increase by 10°F, from 67°F to 77°F, rarely falling below 54°F or exceeding 88°F.

Daily low temperatures increase by 10°F, from 45°F to 55°F, rarely falling below 34°F or exceeding 65°F.

For reference, on July 18, the hottest day of the year, temperatures at Rochelle, Rochelle Municipal-Koritz Field Airport typically range from 62°F to 82°F, while on January 29, the coldest day of the year, they range from 13°F to 29°F.

The figure below shows you a compact characterization of the hourly average temperatures for the quarter of the year centered on May. 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.

Almaty, Kazakhstan (6,497 miles away) is the far-away foreign place with temperatures most similar to Rochelle, Rochelle Municipal-Koritz Field Airport (view comparison).

© OpenStreetMap contributors

Compare Rochelle, Rochelle Municipal-Koritz Field Airport to another city:

CompareMap

The month of May at Rochelle, Rochelle Municipal-Koritz Field Airport experiences gradually decreasing cloud cover, with the percentage of time that the sky is overcast or mostly cloudy decreasing from 51% to 46%.

The clearest day of the month is May 29, with clear, mostly clear, or partly cloudy conditions 54% of the time.

For reference, on December 28, the cloudiest day of the year, the chance of overcast or mostly cloudy conditions is 58%, while on August 25, the clearest day of the year, the chance of clear, mostly clear, or partly cloudy skies is 69%.

A wet day is one with at least 0.04 inches of liquid or liquid-equivalent precipitation. At Rochelle, Rochelle Municipal-Koritz Field Airport, the chance of a wet day over the course of May is increasing, starting the month at 32% and ending it at 37%.

For reference, the year's highest daily chance of a wet day is 39% on June 25, and its lowest chance is 13% on February 4.

Rainfall

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 May at Rochelle, Rochelle Municipal-Koritz Field Airport is increasing, starting the month at 3.2 inches, when it rarely exceeds 5.2 inches or falls below 1.3 inches, and ending the month at 3.9 inches, when it rarely exceeds 6.6 inches or falls below 1.6 inches.

Over the course of May at Rochelle, Rochelle Municipal-Koritz Field Airport, the length of the day is increasing. From the start to the end of the month, the length of the day increases by 57 minutes, implying an average daily increase of 1 minute, 54 seconds, and weekly increase of 13 minutes, 20 seconds.

The shortest day of the month is May 1, with 14 hours, 4 minutes of daylight and the longest day is May 31, with 15 hours, 1 minute of daylight.

The latest sunrise of the month at Rochelle, Rochelle Municipal-Koritz Field Airport is 5:51 AM on May 1 and the earliest sunrise is 28 minutes earlier at 5:23 AM on May 31.

The earliest sunset is 7:55 PM on May 1 and the latest sunset is 29 minutes later at 8:24 PM on May 31.

Daylight saving time is observed at Rochelle, Rochelle Municipal-Koritz Field Airport during 2024, but it neither starts nor ends during May, so the entire month is in standard time.

For reference, on June 20, the longest day of the year, the Sun rises at 5:21 AM and sets 15 hours, 14 minutes later, at 8:35 PM, while on December 21, the shortest day of the year, it rises at 7:20 AM and sets 9 hours, 8 minutes later, at 4:28 PM.

The figure below presents a compact representation of the sun's elevation (the angle of the sun above the horizon) and azimuth (its compass bearing) for every hour of every day in the reporting period. The horizontal axis is the day of the year and the vertical axis is the hour of the day. For a given day and hour of that day, the background color indicates the azimuth of the sun at that moment. The black isolines are contours of constant solar elevation.

The figure below presents a compact representation of key lunar data for May 2024. 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. The label associated with each bar indicates the date and time that the phase is obtained, and the companion time labels indicate the rise and set times of the Moon for the nearest time interval in which the moon is above the horizon.

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 at Rochelle, Rochelle Municipal-Koritz Field Airport is rapidly increasing during May, rising from 1% to 11% over the course of the month.

For reference, on July 21, the muggiest day of the year, there are muggy conditions 46% of the time, while on November 15, the least muggy day of the year, there are muggy conditions 0% of the time.

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 at Rochelle, Rochelle Municipal-Koritz Field Airport is decreasing during May, decreasing from 11.4 miles per hour to 9.7 miles per hour over the course of the month.

For reference, on March 23, the windiest day of the year, the daily average wind speed is 12.5 miles per hour, while on August 2, the calmest day of the year, the daily average wind speed is 7.5 miles per hour.

The hourly average wind direction at Rochelle, Rochelle Municipal-Koritz Field Airport throughout May is predominantly from the south, with a peak proportion of 31% on May 30.

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 at Rochelle, Rochelle Municipal-Koritz Field Airport typically lasts for 5.3 months (162 days), from around April 26 to around October 5, rarely starting before April 7 or after May 17, and rarely ending before September 19 or after October 22.

The month of May at Rochelle, Rochelle Municipal-Koritz Field Airport is more likely than not fully within the growing season, with the chance that a given day is in the growing season rapidly increasing from 62% to 99% over the course of the month.

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 at Rochelle, Rochelle Municipal-Koritz Field Airport are increasing during May, increasing by 339°F, from 183°F to 523°F, over the course of the month.

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 at Rochelle, Rochelle Municipal-Koritz Field Airport is gradually increasing during May, rising by 0.7 kWh, from 5.8 kWh to 6.6 kWh, over the course of the month.

For the purposes of this report, the geographical coordinates of Rochelle, Rochelle Municipal-Koritz Field Airport are 41.893 deg latitude, -89.078 deg longitude, and 771 ft elevation.

The topography within 2 miles of Rochelle, Rochelle Municipal-Koritz Field Airport is essentially flat, with a maximum elevation change of 52 feet and an average elevation above sea level of 776 feet. Within 10 miles is essentially flat (302 feet). Within 50 miles contains only modest variations in elevation (807 feet).

The area within 2 miles of Rochelle, Rochelle Municipal-Koritz Field Airport is covered by cropland (82%) and artificial surfaces (18%), within 10 miles by cropland (97%), and within 50 miles by cropland (86%).