2009...The Year Without A Summer?

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE CHICAGO IL
345 PM CDT SUN JUL 19 2009 /445 PM EDT SUN JUL 19 2009/

...THE YEAR WITHOUT SUMMER...

ASIDE FROM A BRIEF SPELL OF HEAT DURING THE MIDDLE AND END OF JUNE
THIS YEAR HAS LARGELY BEEN A YEAR WITHOUT A SUMMER...OR AT LEAST
WITHOUT SUMMER LIKE HEAT. HERE ARE A FEW INTERESTING STATISTICS
THAT MAY HELP PUT INTO PERSPECTIVE JUST HOW REMARKABLY COOL THINGS
HAVE BEEN...

IN ROCKFORD...

SO FAR IN 2009 THERE HAVE BEEN 23 DAYS WITH HIGH TEMPERATURES AT
OR ABOVE 80 DEGREES. NEVER BEFORE DATING BACK TO 1951 HAS THERE
BEEN A YEAR WITH SO FEW DAYS ABOVE 80. THE AVERAGE NUMBER OF 80
DEGREE DAYS BY JULY 19TH IS 41. GOING BACK TO 1951...THE ONLY 2
OTHER YEARS WITH LESS THAN 30 DAYS ABOVE 80 UP TO THIS POINT IN
THE YEAR WERE 1967 WITH 27 DAYS AND 1997 WITH 28 DAYS.

IN ADDITION...SO FAR THIS JULY RANKS AS THE 2ND COLDEST ON RECORD
WITH AN AVERAGE TEMPERATURE THROUGH THE 18TH OF 66.3 DEGREES. THIS
IS ONLY 0.1 DEGREE BEHIND THE COLDEST ON RECORD WHICH WAS BACK IN
1967. AFTER TODAYS TEMPERATURES ARE FIGURED INTO THE MIX...JULY
2009 WILL BE COLDER THAN JULY 1967 AND WILL BE IN FIRST PLACE
FOR THE COLDEST JULY TO DATE. CONSIDERING THE FORECAST FOR THE
NEXT 10 DAYS IT IS LIKELY THAT THIS MONTH WILL GO DOWN AS ONE OF
THE COLDEST JULYS ON RECORD IN ROCKFORD.

FINALLY...SO FAR THIS MONTH THE HIGHEST TEMPERATURE RECORDED HAS
BEEN 85 DEGREES ON THE 6TH. NEVER HAS THERE BEEN A JULY IN
ROCKFORD WHERE THE TEMPERATURE HASN`T REACHED AT LEAST 88 DEGREES
ONCE. THE JULY WITH THE COLDEST MONTHLY HIGH TEMPERATURE IS JULY
2000 WHEN THE HIGHEST TEMPERATURE FOR THE MONTH WAS 87 ON THE 6TH.

FOR CHICAGO...

SO FAR IN 2009 THERE HAVE BEEN 26 DAYS WITH TEMPERATURES AT OR
ABOVE 80 DEGREES. THIS IS TIED WITH 1947 FOR THE 2ND FEWEST 80
DEGREE DAYS TO DATE IN CHICAGO DATING BACK TO 1942 WHEN THE
OFFICIAL RECORDING STATION WAS MOVED AWAY FROM THE LAKE. THE YEAR
WITH THE FEWEST NUMBER OF DAYS ABOVE 80 THROUGH JULY 19TH IS 1967
WHEN THERE HAD ONLY BEEN 24 DAYS. THE AVERAGE NUMBER OF 80 DEGREE
DAYS THROUGH JULY 19TH DATING BACK TO 1942 IN CHICAGO IS 40.

IN ADDITION...THIS HAS BEEN THE 3RD COLDEST JULY 1ST THROUGH 18TH
IN CHICAGO SINCE 1942 WITH AN AVERAGE TEMPERATURE OF 68.5 DEGREES.
THE COLDEST JULY 1ST THROUGH 18TH OCCURRED BACK IN 1945 WHEN THE
AVERAGE TEMPERATURE WAS 68.1 DEGREES AND THE SECOND COLDEST WAS
BACK IN 1967 WHEN THE AVERAGE TEMPERATURE WAS 68.2.

FINALLY...SO FAR THIS JULY THE WARMEST TEMPERATURE HAS BEEN 86
DEGREES ON JULY 6TH. DATING BACK TO 1942 THERE NEVER HAS BEEN A
JULY IN CHICAGO WHERE THE TEMPERATURE DIDN`T REACH AT LEAST 89
DEGREES. IN BOTH 2000 AND 1979 THE WARMEST TEMPERATURES FOR THE
MONTH OF JULY WERE 89 DEGREES...SO WITH NO HEAT CURRENTLY IN THE
FORECAST THIS RECORD COULD BE IN JEOPARDY AS WELL.

WHEN GOING THROUGH RECORD BOOKS LOOKING AT COOL SUMMERS...1967
COMES UP NEAR THE TOP OF MANY LISTS AND SEEMS TO BE THE MOST
COMPARABLE SUMMER ON RECORD TO THE CURRENT SUMMER. LOOKING BACK AT
1967 IT APPEARS AS THOUGH THE COOL WEATHER DIDN`T LET UP IN AUGUST.
IN FACT...AUGUST 1967 FEATURED 17 DAYS WITH HIGHS COOLER THAN 80F
AND OF THOSE 4 FAILED TO EVEN REACH 70F. THERE WERE ALSO NO DAYS
IN AUGUST 1967 WITH HIGHS AT OR ABOVE 90 IN CHICAGO. WHILE THESE
STATS ABOUT AUGUST 1967 MAY BE INTERESTING...THEY HOLD ABSOLUTELY
NO PREDICTIVE VALUE WHATSOEVER AS TO WHAT AUGUST 2009 MAY HOLD.

$$

IZZI



Return to News Archive

USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.