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May 2014

January thru April 2014 Was the Coldest in New York Since 1970

Nyc.iceageThe first four months of 2014 all had below average temperatures, making this the chilliest beginning of a year since 1970.  (It was 0.1 degree chillier than 2003).  However, while this year has been chilly by today's climate standards, it wouldn't have gotten much notice in the years before 1940 when half of the years were colder.  While only three years since 1940 have been chillier than 2014, between 1869-1939 more than half of the years started out colder.  Looking at all years since 1869, 2014 is ranked 40th.  That still makes it relatively chilly, but far from the colder levels experienced more than 100 years ago as shown in the chart below:     

 

5 COLDEST JAN-APRIL SINCE 1940
     
  Average  
  Temp  
1940 34.9  
1970 37.2  
1948 37.3  
2014 37.6  
2003 37.7  
     
12 COLDEST JAN-APRIL SINCE 1869
     
  Average  
  Temp   
1875 31.6  
1888 32.0  
1885 33.2  
1904 33.5  
1893 33.7  
1883 33.8  
1881 34.1  
1872 34.6  
1940 34.9  
1887 34.9  
1920 35.0  
1895 35.0  

 


April Ends with a BIG Splash

April30.rainstorm

 

No month has ever ended with such a big rainstorm as did April 2014.  4.97" poured down on April 30, making it New York's rainiest day on record.  Previous to this, the rainiest day at the end of a month end occurred on Aug. 31, 1911 when 3.76" fell.  Before April 30th's deluge the month had been an inch-and-a-half below average.  It ended up becoming the sixth rainiest April on record. 

 

April.showers

 

More than 60% of the month's rainfall was accounted for on the last day of the month.  What also made this day's rainfall of interest was that up until this year April 30 was one of three days in which an inch or more of rain had never fallen (the other two days are April 29 and Sept. 9). 

 

And the wettest first day of any month?  When this post was written in 2014, that honor went to Oct. 1, 1913, which had 4.98" measured (yes, 0.01" more than April 30, 2014); however, it fell to second place when 7.13" of rain fell on the first day of September 2021.  

 

RAINIEST ENDS TO A MONTH
     
    % of Month's
Date Amount Total Precip
April 30.2014 4.97" 63%
Aug 31,1911 3.76" 41%
May 31,1940 3.13" 41%
June 30, 1984 3.07" 53%
Oct 31,1956 2.41" 67%
Dec 31,1948 2.31" 37%
July 31, 1889 2.29" 19%
Feb 29,1896 2.26" 33%
Sept 30,1921 2.21" 46%
July 31,1925 2.14" 37%
     
RAINIEST STARTS TO A MONTH
Sept 1, 2021            7.13"         71%
Oct 1, 1913 4.98" 38%
Sept 1, 1927 3.84" 90%
Sept 1, 1983 3.40" 74%
Mar 1, 1914 2.95" 62%
Aug 1,1878 2.85" 36%
June 1,1887 2.60" 34%
May 1  1976 2.48" 52%
Oct 1, 2010 2.46" 50%
July 1,1933 2.17" 36%
July 1, 1922 2.13" 28%
     

 

(Many thanks to my friend Eugene DeMarco for creating a spreadsheet that listed every one-inch rainfall in NYC since 1869. It made doing this analysis possible.)