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Dry Months in New York

Drier than normalFor the purposes of this analysis a dry month is one that had less than two inches of precipitation.  In the years since 1869, 18% of all months have been this dry, or about two months each year.  The most dry months in one year is six, which happened in 1910, 1946 and 1965.  The most consecutive months with less than two inches measured is four, which occurred in 1881 from July thru October.  Finally, there have been 15 years in which no month had less than two inches - most recently in 2018 (two of these 15 years were consecutive, in 2010 and 2011).

 

 

Graph - precip of less than 2 inches by month

 

CONSECUTIVE DRY MONTHS WITHIN A YEAR

The most consecutive months with less than two inches of precipitation is four, which happened in 1881 between July-October (1.25", 0.86", 0.97" and 1.60").  There have been nine other years that had three dry months in a row, the most recent being in 1993.  The smallest amount of rain during one of these streaks was 2.98" in 1910 (July-Sept.).

 

Chart - 3 months in a row with less than 2 inches

 

Two of the three years that have had six months with less than two inches of precipitation, 1910 and 1965, are among New York's ten driest years, but the third, 1946, is ranked 27th.

Five Octobers in a row from 1946-1950 had less than two inches of rain.  And there have been three other months that had this little precipitation in four consecutive years: January 1954-57; May 1902-05 and September 1884-87.  And seven of the nine Novembers between 1901-09 had two inches or less.

 

LESS THAN ONE INCH OF RAIN

Nearly one out of four dry months had less than one inch of rain, or about once every two years.  The greatest number of these very dry months in one year is three and it's happened twice, in 1881 and 1955.  The most years in a row to have the same month report less than one inch is two, which has happened three times: July 1954 (0.96") & 1955 (0.51"); Sept. 1884 (0.21") & 1885 (0.41"); and Oct. 2000 (0.68") & 2001 (0.66").

 

DRIEST MONTH OF EACH YEAR

On average, the driest month of a year has had 1.24" of precipitation (and most likely to happen in October).  About 40% of all years have had less than an inch of precipitation during their driest month.  June 1949 is the driest month of all time, with just 0.02" measured; the driest month in recent years is October 2013, which had just 0.36". The most consecutive years with a driest month reporting less than an inch is four, which was between 1999-2002.  

Thirteen years have had more than two inches as their driest month.  And two of them had more than three inches: 3.04" in 1975 and 3.03" in 2011. 

In both 1980 and 1981 the driest month had 0.58" of precipitation, and it was in consecutive months - Dec. 1980 and Jan. 1981.  And later in 1981, August had 0.59".  Two other years' second-driest month also had just 0.01" more than the driest month (1900 and 1975), while 1926's second driest month had 0.02" more.  And in 2000, 2001 and 2002 the driest months had 0.68", 066" and 0.71", respectively.

In the three consecutive years between 1903-1905, May was the driest month, and in the three consecutive years 1945-1947, October was the driest month.  Finally, in the four-year period 1967-1970 three of the years had January as their driest month (1967, 1968 and 1970).

 

Graph - driest month of year since 1869

 

Arid

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