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bluewave
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2 minutes ago, Allsnow said:

Thunder but no rain…this is cruel 

Yeah that cell missing us just to the south, and the stuff in Hunterdon County will miss us to the north. We can't buy a drop of rain. The situation is horrendous ... don't think I've ever seen it this parched out there.

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1 hour ago, Roger Smith said:

Since I am doing research involving the NYC data base, I would be interested in thoughts about how long the tree canopy issue has possibly been affecting temperatures and by what amount, also could we say it was an issue only during foliation season? How strong a wind negates it? 

We can clearly identify the mid 1990s into the early 2000s  as the period when the trees began to cover the Central Park equipment. From the 1950s through the early 1990s, NYC would record 90 degree days in reasonable agreement with either EWR or LGA. Then NYC fell far behind during the 2000s when tree growth caused the high temperature readings to become unreliable. 
 

Sample years for 90 days since 1955

1955

EWR…32

NYC….25

LGA…..29

1966

EWR….33

NYC….35

LGA….25

1977

EWR….26

NYC….23

LGA…..14

1980

EWR…27

NYC…32

LGA….22

1983

EWR…40

NYC…36

LGA….31

1988

EWR….43

NYC….32

LGA…..26

1991

EWR…41

NYC…39

LGA….34

1999

EWR….33

NYC….27

LGA….26

2005

EWR….37

NYC….23

LGA…..30

2006

EWR…..27

NYC…..8

LGA……22

2010

NYC…54

NYC….37

LGA….48

2016

EWR….40

NYC…..22

LGA…..32

2020

EWR….31

NYC….20

LGA…..34

2021

EWR….41

NYC…..17

LGA…..25

Central Park would regularly tie or lead for the most 90° days from the 1930s to 1980. But the tree growth over the equipment has prevented it from happening since 1980. If the station  was properly maintained, NYC could have lead the area or tied for the most 90° days several years since then.

Years when Central Park lead or tied for most 90° days 

1936

NYC….26

EWR….22

1937

NYC…22

EWR…22

1939

NYC…24

EWR…24

1941

NYC…29

EWR…27

1953

NYC….32

EWR….32

1962

NYC….18

EWR….14

1966

NYC…35

EWR….33

1967

NYC…..9

EWR….7

1969

NYC….16

EWR…15

1970

NYC…29

EWR….29

1976

NYC…15

EWR..15

1980

NYC…32

EWR…27

 

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