May brings a big boost in daylight for the Stateline, pushing sunsets after 8PM. By the end of the month, northern Illinois will gain about 50 to 60 minutes of daylight, pushing sunset times closer to 8:30PM. But while evenings grow brighter and brighter, the month kicks off with a lingering chill, reminding us summer isn't here just yet.
Temperatures will trend even cooler than Wednesday and Thursday with highs reaching the low 50s. A light northwest wind will keep that cool feel in place, and we can't completely rule out a brief sprinkle or shower. An upper-level low lingering over the Great Lakes will send another weak disturbance into the region, keeping clouds around at times but also assisting in today's isolated chance.
Tonight, frost is the main concern. High pressure moving in will help clear skies, allowing temperatures to fall into the low 30s. Green, Rock, and Walworth County have been placed under a FREEZE WARNING whereas northern Illinois has been placed under a FROST ADVISORY. With conditions favorable for frost, be sure to cover or bring in any sensitive or newly planted vegetation.
As for the weekend, northern Illinois will see a quiet but cool start. Saturday features high pressure, leaving skies partly cloudy with afternoon highs staying in the 50s. Clouds will increase late Saturday into Saturday night as our next storm system approaches. With it will be a scattered rain chance than extends into the first half of Sunday. Temperatures will respond to the newly-introduced southwesterly wind, warming into the mid 60s to wrap up the weekend.
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