Things you often hear in Louisvlle related to the weather, "What a difference a day makes", "If you don't like the weather now, just wait a day (maybe an hour)". That's the case over the last 24 hours.
The high yesterday was 84 degrees. As of the writing of this, it's now 43, with wind chills in the low-mid 30s (map below), with a report of SNOWFLAKES mixing in with light rain downtown! But, remember it has snowed much later than this before. 1.0" of snow was reported on May 6th, 1898, and a trace of snow was reported on May 20th, 1894!
So, now that the cold air is here, we're going to have to watch out for frosty spots. This is not a good thing to start the growing season. I don't expect our frosts to be as bad as last April's freeze, but some areas will need to watch the thermometer closely the next couple nights.
The Louisville National Weather Service office says,
...FROST POSSIBLE EARLY SATURDAY... MUCH COLDER AIR WILL RUSH INTO THE REGION TODAY IN THE WAKE OF A STRONG COLD FRONT THAT HAS CLEARED THE REGION THIS MORNING. GUSTY WEST WINDS THROUGH THE DAY SHOULD START TO DIE DOWN THIS EVENING AND SET THE STAGE FOR A QUICK COOL DOWN OVERNIGHT...ESPECIALLY AFTER SKIES CLEAR OUT LATE THIS EVENING. EXPECT TEMPERATURES TO FALL INTO THE LOW TO MID 30S BY DAYBREAK SATURDAY MORNING...WHICH SHOULD ALLOW FOR AT LEAST PATCHY FROST TO FORM. SHOULD SKIES CLEAR OUT QUICKER THAN FORECAST...TEMPERATURES MAY DROP TO BELOW FREEZING IN SOME SPOTS WITH MORE WIDESPREAD FROST POSSIBLE AS WELL. THESE KIND OF TEMPERATURES CAN KILL COLD-SENSITIVE VEGETATION.
Latest spring frost (36°): May 27, 1961
Latest spring freeze (32°): May 10, 1966
Latest spring hard freeze (28°): April 23, 1986
Earliest final spring frost (36°): March 15, 1884
Earliest final spring freeze (32°): March 5, 1927
Earliest final spring hard freeze (28°): February 19, 1905
Average last spring frost (36°): April 19
Average last spring freeze (32°): April 6
Average last spring hard freeze (28°): March 25