TRENTON, NEW JERSEY
CLIMATE DATA OBSERVED AT COOP 999999/14792 ("MERCER COUNTY AIRPORT"/"TRENTON MERCER AIRPORT")
With the closing of "Trenton WBO City"/"Trenton WSO City" on December 1, 1981, weather observing moved from the
city of Trenton to its suburb Ewing, the location of what is currently known as "Trenton Mercer Airport". Hourly
airway observations had begun at what was then known as "Skillman Airport" in 1930, though for climate purposes
these consisted only of hourly temperature data with no observations in the middle of the night and no rainfall or
snowfall reports. This remained true even after World War II, when the facility was renamed "Mercer County
Airport." Air traffic at the facility simply was not heavy enough to warrant a Weather Bureau office, so while
offices across the country were relocating from downtown buildings to airport terminals and control towers in the
1940s, 1950s and 1960s, in Trenton the office remained downtown until it closed on November 30, 1981. Thus, from
December 1, 1981 through March 10, 1998, the only data directly from the airport that could be used for
climatological purposes were the hourly temperature reports, which were analyzed for 24-hour maximum and minimum
values.
Because no precipitation gage was located at the airport itself, fifteen-minute precipitation data from a
Fischer-Porter Automatic Precipitation Gage at "Trenton State College" was used to fill in the gap. This weighing
precipitation gage, located 2.1 miles east-southeast of the airport air traffic control tower in Ewing, determined
the amount of precipitation by the weight of the contents of the guage. The gage was originally installed in 1976.
Its measurements were also analyzed for 24-hour values between December 1, 1981 and March 10, 1998.
Because snowfall measurements were not made at either the airport or the college, measurements made by the
webmaster and his family were incorporated. Their residence is also located in Ewing, 1.8 miles southeast of the
airport control tower, and 0.8 mile southwest of the "Trenton State College" precipitation gage.
A private observing site known as "Washingtons Crossing", located 2.5 miles north of the airport control tower in
Hopewell Township, provided back-up observations between December 1, 1981 and March 10, 1998 if data from any of the
three primary sites in Ewing was missing.
On March 11, 1998, an Automated Surface Observing System (ASOS) was installed at the airport. This system became
the primary precipitation and temperature observation system, and remains so at present. The precipitation gage at
the newly renamed "College of New Jersey" continued to function through 2001, providing additional data during
snowfall events when the ASOS tipping-bucket guage had difficulty measuring the water-content of snow. Snowfall
itself continues to be measured by the webmaster and his family, who continue to reside 1.9 miles southeast of the
airport ASOS.
It must be noted that none of the data listed from this combined observing site is considered official by the
National Climatic Data Center. However, it is hoped that one day, it will be properly filed with the NCDC.
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Trenton Mercer Airport (formerly Mercer County Airport) became the primary Trenton observing site for temperatures
on December 1, 1981. It became the primary observing site for precipitation on March 11, 1998.
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Before the installation of the Automated Surface Observing System (ASOS), observations were taken at the control
tower (left); since March 11, 1998, the ASOS (right) has been the primary producer of observations.
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A close-up of the ASOS.
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Cromwell Hall at the College of New Jersey (formerly Trenton State College). A Fischer-Porter precipitation gage
located here was the primary precipitation observing system for Trenton from December 1, 1981 through March 10,
1998. It provided back-up precipitation data until the end of 2001.
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The residence of the webmaster and his family in Ewing, New Jersey, where snowfall observations are currently made.
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The Washington's Crossing Bridge in Washington's Crossing, New Jersey (during the Delaware River Flood of June
2006). The exact location of the private weather station at Washington's Crossing is not shown here at the
observer's request. This site provided back-up observations for all three sites listed above as needed.
DAILY DATA SUPPLIED BY "MERCER COUNTY AIRPORT"/"TRENTON MERCER AIRPORT"
DEC 1981
JAN 1982 FEB 1982 MAR 1982 APR 1982 MAY 1982 JUN 1982 JUL 1982 AUG 1982 SEP 1982 OCT 1982 NOV 1982 DEC 1982
JAN 1983 FEB 1983 MAR 1983 APR 1983 MAY 1983 JUN 1983 JUL 1983 AUG 1983 SEP 1983 OCT 1983 NOV 1983 DEC 1983
JAN 1984 FEB 1984 MAR 1984 APR 1984 MAY 1984 JUN 1984 JUL 1984 AUG 1984 SEP 1984 OCT 1984 NOV 1984 DEC 1984
JAN 1985 FEB 1985 MAR 1985 APR 1985 MAY 1985 JUN 1985 JUL 1985 AUG 1985 SEP 1985 OCT 1985 NOV 1985 DEC 1985
JAN 1986 FEB 1986 MAR 1986 APR 1986 MAY 1986 JUN 1986 JUL 1986 AUG 1986 SEP 1986 OCT 1986 NOV 1986 DEC 1986
JAN 1987 FEB 1987 MAR 1987 APR 1987 MAY 1987 JUN 1987 JUL 1987 AUG 1987 SEP 1987 OCT 1987 NOV 1987 DEC 1987
JAN 1988 FEB 1988 MAR 1988 APR 1988 MAY 1988 JUN 1988 JUL 1988 AUG 1988 SEP 1988 OCT 1988 NOV 1988 DEC 1988
JAN 1989 FEB 1989 MAR 1989 APR 1989 MAY 1989 JUN 1989 JUL 1989 AUG 1989 SEP 1989 OCT 1989 NOV 1989 DEC 1989
JAN 1990 FEB 1990 MAR 1990 APR 1990 MAY 1990 JUN 1990 JUL 1990 AUG 1990 SEP 1990 OCT 1990 NOV 1990 DEC 1990
JAN 1991 FEB 1991 MAR 1991 APR 1991 MAY 1991 JUN 1991 JUL 1991 AUG 1991 SEP 1991 OCT 1991 NOV 1991 DEC 1991
JAN 1992 FEB 1992 MAR 1992 APR 1992 MAY 1992 JUN 1992 JUL 1992 AUG 1992 SEP 1992 OCT 1992 NOV 1992 DEC 1992
JAN 1993 FEB 1993 MAR 1993 APR 1993 MAY 1993 JUN 1993 JUL 1993 AUG 1993 SEP 1993 OCT 1993 NOV 1993 DEC 1993
JAN 1994 FEB 1994 MAR 1994 APR 1994 MAY 1994 JUN 1994 JUL 1994 AUG 1994 SEP 1994 OCT 1994 NOV 1994 DEC 1994
JAN 1995 FEB 1995 MAR 1995 APR 1995 MAY 1995 JUN 1995 JUL 1995 AUG 1995 SEP 1995 OCT 1995 NOV 1995 DEC 1995
JAN 1996 FEB 1996 MAR 1996 APR 1996 MAY 1996 JUN 1996 JUL 1996 AUG 1996 SEP 1996 OCT 1996 NOV 1996 DEC 1996
JAN 1997 FEB 1997 MAR 1997 APR 1997 MAY 1997 JUN 1997 JUL 1997 AUG 1997 SEP 1997 OCT 1997 NOV 1997 DEC 1997
JAN 1998 FEB 1998 MAR 1998 APR 1998 MAY 1998 JUN 1998 JUL 1998 AUG 1998 SEP 1998 OCT 1998 NOV 1998 DEC 1998
JAN 1999 FEB 1999 MAR 1999 APR 1999 MAY 1999 JUN 1999 JUL 1999 AUG 1999 SEP 1999 OCT 1999 NOV 1999 DEC 1999
JAN 2000 FEB 2000 MAR 2000 APR 2000 MAY 2000 JUN 2000 JUL 2000 AUG 2000 SEP 2000 OCT 2000 NOV 2000 DEC 2000
JAN 2001 FEB 2001 MAR 2001 APR 2001 MAY 2001 JUN 2001 JUL 2001 AUG 2001 SEP 2001 OCT 2001 NOV 2001 DEC 2001
JAN 2002 FEB 2002 MAR 2002 APR 2002 MAY 2002 JUN 2002 JUL 2002 AUG 2002 SEP 2002 OCT 2002 NOV 2002 DEC 2002
JAN 2003 FEB 2003 MAR 2003 APR 2003 MAY 2003 JUN 2003 JUL 2003 AUG 2003 SEP 2003 OCT 2003 NOV 2003 DEC 2003
JAN 2004 FEB 2004 MAR 2004 APR 2004 MAY 2004 JUN 2004 JUL 2004 AUG 2004 SEP 2004 OCT 2004 NOV 2004 DEC 2004
JAN 2005 FEB 2005 MAR 2005 APR 2005 MAY 2005 JUN 2005 JUL 2005 AUG 2005 SEP 2005 OCT 2005 NOV 2005 DEC 2005
JAN 2006 FEB 2006 MAR 2006 APR 2006 MAY 2006 JUN 2006 JUL 2006 AUG 2006 SEP 2006 OCT 2006 NOV 2006 DEC 2006
JAN 2007 FEB 2007 MAR 2007 APR 2007 MAY 2007 JUN 2007 JUL 2007 AUG 2007 SEP 2007 OCT 2007 NOV 2007 DEC 2007
JAN 2008 FEB 2008 MAR 2008 APR 2008 MAY 2008 JUN 2008 JUL 2008 AUG 2008 SEP 2008 OCT 2008 NOV 2008 DEC 2008
DISCLAIMER
The data on this website has been compiled by Raymond C. Martin, Jr.
While the best attempt has been made to ensure accuracy, the data provided here CANNOT be guaranteed.
The National Climatic Data Center is the sole source of official climate data for the United States.
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