Chicago Ends Record Snowless Streak; Other Streaks Continue

Image (click to enlarge): Chicago regional snowfall on December 20, 2012, from National Weather Service

The 0.2" of snow on Thursday (December 20) at Chicago ended the record longest streak without measurable snow. It was also the latest occurrence of a first measurable snow. Other streaks are continuing, including:

- 300th day without a high temperature below freezing (tied for 2nd longest)
- Latest first day of the season with high temperature below freezing (tied for 5th)
- 301st day without an inch or more of snow (8th longest)
- 299th day without an inch of snow on the ground (3rd longest)
- 344th day of the year without a high at or above freezing (tied for 8th)

The average temperature for 2012 to date is also well on the way to being the warmest on record at Chicago.

Here is the complete report from the National Weather Service:

THURSDAY`S STORM IN CHICAGO MANAGED TO MUSTER UP A COUPLE TENTHS
OF AN INCH OF ACCUMULATION WHICH OFFICIALLY ENDED CHICAGO`S SNOW
DROUGHT AND ESTABLISHED NEW RECORDS FOR LATEST FIRST MEASURABLE
SNOWFALL AND LONGEST STRETCH OF NO MEASURABLE SNOWFALL EVER IN
CHICAGO. HOWEVER...THURSDAY STORM HAS LEFT INTACT SOME OTHER
NOTABLE STREAKS FOR CHICAGO.

TEMPERATURES AT MIDNIGHT WERE STILL ABOVE FREEZING...SO THE STREAK
OF DAYS WITHOUT A SUB-FREEZING HIGH TEMPERATURE CONTINUES IN
CHICAGO. TODAY`S HIGH TEMPERATURE ABOVE FREEZING MAKES IT THE 300TH
CONSECUTIVE DAY WITHOUT A HIGH TEMPERATURE BELOW FREEZING...TYING
2004 FOR THE 2ND LONGEST STREAK. THE FORECAST SUGGESTS THIS STREAK
WILL CONTINUE THIS WEEKEND WHICH WOULD MAKE THIS YEAR THE LONGEST
STREAK WITHOUT A SUB-FREEZING HIGH TEMPERATURE SINCE 1878 WHEN
CHICAGO`S OFFICIAL OBSERVATION STATION WAS AT THE CHICAGO OPERA
HOUSE ON THE CORNER OF CLARK AND WASHINGTON IN THE LOOP. HERE ARE
THE TOP 5 LONGEST STREAKS OF CONSECUTIVE DAYS WITHOUT A HIGH
TEMPERATURE ABOVE FREEZING...

  # DAYS     END DATE
1)  308     12/15/1878
2)  300+    12/21/2012+
    300     12/12/2004
4)  290     12/09/2011
5)  289     12/24/1918

NOW THAT TODAYS HIGH TEMPERATURE IN CHICAGO WILL OFFICIALLY BE AT
LEAST 33F (THE READING AT MIDNIGHT)...THIS YEAR IN CHICAGO IS NOW
GUARANTEED TO MOVE INTO AT LEAST A TIE FOR 5TH PLACE FOR LATEST
FIRST DAY OF THE SEASON WITH A HIGH TEMPERATURE BELOW FREEZING.
HERE ARE THE TOP 5 LATEST DATES FOR FIRST DAY WITH HIGHS BELOW
FREEZING...

1) JAN 1 1924
2) DEC 28 1971
3) DEC 25 1918
4) DEC 24 2011
5) DEC 22 1998
   ??? ?? 2012

THE LAST TIME CHICAGO HAS HAD A CALENDAR DAY SNOWFALL OF ONE INCH
WAS BACK ON FEBRUARY 24TH...SO TODAY WILL BE THE 301ST CONSECUTIVE
DAY WITHOUT A 1 INCH SNOWFALL MAKING IT THE 8TH LONGEST STREAK
EVER IN CHICAGO. WITH SEVERAL MORE DAYS OF NO SNOW EXPECTED...THIS
YEAR IS BOUND TO MOVE UP IN THE RANKINGS. HERE ARE THE TOP TEN
LONGEST STREAKS WITHOUT A 1 INCH CALENDAR SNOWFALL...

  # DAYS     END DATE
1)  319     01/06/1940
2)  315     12/07/1958
3)  307     12/03/1921
4)  305     01/15/2002
5)  303     01/07/1944
6)  302     12/09/1988
    302     11/16/1927
8)  301+    12/21/2012+
9)  299     12/29/1990
10) 298     12/23/1918

CALENDAR SNOWFALL MAY BE SOMEWHAT DECEPTIVE SINCE THERE WERE LIKELY
EVENTS IN SOME OF THOSE YEARS WHERE A SNOWFALL MAY HAVE CROSSED
CALENDAR DAYS WITH A STORM TOTAL GREATER THAN 1 INCH...BUT EACH
CALENDAR DAY LESS THAN AN INCH RESPECTIVELY. TO REALLY PUT OUR SNOW
DROUGHT IN PERSPECTIVE...IT HAS BEEN 299 DAYS NOW SINCE CHICAGO HAS
OFFICIALLY HAD AN INCH OF SNOW ON THE GROUND. THIS IS THE 3RD
LONGEST STREAK OF CONSECUTIVE DAYS WITHOUT AN INCH OF SNOW ON THE
GROUND. HERE ARE THE TOP 5 LONGEST STREAKS...

  # DAYS     END DATE
1)  313     01/06/1940
2)  302     01/07/1944
3)  299+    12/21/2012+
4)  296     12/12/1988
    296     12/14/1946

ANOTHER INTERESTING STATISTIC IS THAT CHICAGO HAS HAD 344 DAYS WITH
HIGHS AT OR ABOVE FREEZING SO FAR THIS YEAR...WHICH ALREADY PLACES
US TIED FOR THE 8TH MOST NUMBER OF DAYS WITH HIGHS AT OR ABOVE
FREEZING IN A YEAR. WITH 10 MORE DAYS TO GO THIS YEAR AND MANY OF
THEM LIKELY ABOVE FREEZING 2012 IS LIKELY TO MOVE UP IN THE RANKING
HERE AS WELL. HERE ARE THE TOP 10 MOST NUMBER OF DAYS ABOVE FREEZING
IN A YEAR...

  # DAYS    YEAR
1)  355     1931
2)  353     2006
3)  348     1990
4)  346     1987
5)  345     1878
    345     1992
    345     1998
8)  344     1954
9)  343+    2012 (THROUGH AND INCLUDING 12/21/2012)
10) 342     1882
    342     1911
    342     1921

FINALLY...THE AVERAGE TEMPERATURE IN CHICAGO SO FAR THIS YEAR HAS
BEEN 55.4 DEGREES WHICH PLACES 2012 WITHIN STRIKING DISTANCE OF
BREAKING THE RECORD FOR THE WARMEST YEAR EVER IN CHICAGO. THE
PREVIOUS RECORD WARMEST YEAR WAS 1921 WHEN THE AVERAGE TEMPERATURE
WAS 54.5F. IN ORDER TO HAVE THIS YEAR AVERAGE 54.6F AND BREAK THE
RECORD THE LAST 11 DAYS OF THE YEAR NEED TO HAVE AN AVERAGE
TEMPERATURE OF APPROXIMATELY 28.8F. IN ORDER FOR 2012 TO BE TIED FOR
THE WARMEST YEAR ON RECORD IN CHICAGO THE REMAINING 11 DAYS OF THE
YEAR WOULD NEED TO HAVE AN AVERAGE TEMPERATURE OF APPROXIMATELY
25.5F.