Cool Nights to End This Weekend; Freeze Climatology Info

 The weekend will end on a cool note before a significant warm-up for Tuesday and Wednesday.  Frost is looking likely in outlying areas tonight and a Frost Advisory has been issued.   

Weather Story

Weather Story

   

 

Forecast Low Temperatures Sunday Night

 

Click here for a regional map of the average last freeze date.

In order to gauge the risk of experiencing freezing temperatures through the spring season, consider the tables below.  These tables display the probabilities of exceedance for the date of the last spring freeze (32 degrees and colder), as well as the date of the last spring season hard freeze (28 degrees and colder) at both Chicago and Rockford. To interpret these tables consider, for example, the 10th percentile for Chicago in the table below. The date listed is May 7th for the date of the last freeze.  This means that of all the years in the history for Chicago dating back to the late 1800s 10% of the years experienced the final spring freeze on a date later than May 7th.   So, statistically speaking there is a 10% chance that freezing temperatures will still be observed at least once after April 12th.  Notice the dates at Rockford are later.  

Chicago , IL
 
Probability of Exceedance
Date of Last Spring Freeze (32° or colder)
Date of Last Spring Hard Freeze (28° or colder)
Earliest
March 16th
March 4th 
90%
April 5th
March 24th
70%
April 12th
March 31st
50%
April 18th
April 7th
30%
April 24th
April 11th
10%
May 7th
April 20th
Latest
May 25th
May 10th

 

Rockford , IL
 
Probability of Exceedance
Date of Last Spring Freeze (32° or colder)
Date of Last Spring Hard Freeze (28° or colder)
Earliest
April 7th
March 27th
90%
April 16th
April 5th
70%
April 25th
April 10th
50%
May 1st 
April 15th
30%
May 7th
April 21st  
10%
May 17th
April 30th
Latest
May 27th
May 11th

 

Observed Last Freeze Thus Far:

 Last Freeze

 



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