90 Degree Days

[LibertyBell]

3 hours ago, donsutherland1 said:

wow huge change in 95+ days at both LGA and EWR and a significant change in 80+ lows at LGA!!!

 

[tamarack]

On 7/18/2025 at 2:29 PM, donsutherland1 said:

I think there's nothing they can do at Central Park if the Conservatory refuses to trim the trees. Thus, since monthly and annual data can be adjusted as appropriate to compensate for the site changes that have affected high temperatures during the foliage season, the station goes on as is. I suspect that the value of a long-term climate record supersedes the loss of quality of day-to-day readings.

A long distance from New York City, both miles and character, the Farmington Maine (pop. ~5,000) co-op recorded from January 1, 1893 thru mid-October 2022.  It's sites (several) thru the summer of 1966 were in town.  In September of that year, the new observer moved the location 1.5 miles to the north, a site along the 2-lane Route 4/27 with single-family homes generally 100+ feet apart and only small vegetation.  Over the years trees grew larger, and by its closure (observer had passed) there was a 50-foot-tall red oak less than 30 feet from the Cotton Region shelter and other trees within 100 feet.  Below are the most recent heat records, showing the lowering of most recent hottest:

101   8/2/1975    "Hot Saturday"  Even reached 100 at Bar Harbor.  (Also all-time records at PWM [103] and BGR [102])
99    6/20/1985
95    9/9/2002
94    6/20/2020
93    6/28/2021
92    5/14/2022

I'm not sure why the dates (except 1975) are all shoulder season.  Forest transpiration would've been relatively low in mid-May and in September, but should've been in high gear by late June.

[donsutherland1]

1 hour ago, tamarack said:

A long distance from New York City, both miles and character, the Farmington Maine (pop. ~5,000) co-op recorded from January 1, 1893 thru mid-October 2022.  It's sites (several) thru the summer of 1966 were in town.  In September of that year, the new observer moved the location 1.5 miles to the north, a site along the 2-lane Route 4/27 with single-family homes generally 100+ feet apart and only small vegetation.  Over the years trees grew larger, and by its closure (observer had passed) there was a 50-foot-tall red oak less than 30 feet from the Cotton Region shelter and other trees within 100 feet.  Below are the most recent heat records, showing the lowering of most recent hottest:

101   8/2/1975    "Hot Saturday"  Even reached 100 at Bar Harbor.  (Also all-time records at PWM [103] and BGR [102])
99    6/20/1985
95    9/9/2002
94    6/20/2020
93    6/28/2021
92    5/14/2022

I'm not sure why the dates (except 1975) are all shoulder season.  Forest transpiration would've been relatively low in mid-May and in September, but should've been in high gear by late June.

Trees have a cooling effect. In a way, Central Park is providing a demonstration of how trees can blunt at least some of the warming that is ongoing. Here's how things have fared in terms of average summer high temperatures 1961-1990 and 1991-2020 in the New York City area. Central Park is the lone sight showing a slight cooling of mean summer high temperatures.

[LibertyBell]

1 hour ago, donsutherland1 said:

Trees have a cooling effect. In a way, Central Park is providing a demonstration of how trees can blunt at least some of the warming that is ongoing. Here's how things have fared in terms of average summer high temperatures 1961-1990 and 1991-2020 in the New York City area. Central Park is the lone sight showing a slight cooling of mean summer high temperatures.

Greening the city is a really good idea with multiple health benefits (not just cooler temperatures but reducing air pollution by serving as air filters too.)

 

[donsutherland1]

13 minutes ago, LibertyBell said:

Greening the city is a really good idea with multiple health benefits (not just cooler temperatures but reducing air pollution by serving as air filters too.)

 

I agree. Paris provides a good example of the benefits of greening. 

[SACRUS]

On 4/26/2011 at 9:17 AM, SACRUS said:

2025:

PHL: 29  (Apr:  ; May:  ; Jun: 9 ; Jul: 20  ; Aug:   ; Sep: )
EWR: 29 (Apr:  ; May:  ; Jun: 10  ; Jul: 19 ; Aug:  ; Sep: )
TTN:  14  (Apr:  ; May:  ; Jun: 6 ; Jul:  8 ; Aug:  ; Sep: )
LGA:  20 (Apr:  ; May:   ; Jun: 8; Jul :  12; Aug:  ; Sep: )
ACY:  19 (Apr:  ; May:  ; Jun: 9 ; Jul: 9  ; Aug:  ; Sep:  )
TEB:  26 (Apr:  ; May:  ; Jun : 10   ; Jul: 16 ; Aug:  ; Sep: )
NYC:  11 (Apr:  ; May:  ; Jun:  4; Jul:  7; Aug:  ; Sep: )
JFK: 14 (Apr:  ; May:  ; Jun: 7; Jul: 7; Aug:  ; Sep:  )
ISP:  12 (Apr:  ; May:  ; Jun: 5 ; Jul: 7 ; Aug: ; Sep: )

New Brunswick: 20 (Apr:  ; May:  ; Jun: 9 ; Jul:  11 ; Aug:  ; Sep: )
BLM:  14 (Apr:  ; May:  ; Jun: 6 ; Jul:  9; Aug:  ; Sep: )

89 Degree Days:

New Brnswck: 6
TTN: 5
TEB: 4
BLM: 2
EWR: 1
NYC: 2
ACY 2
ISP: 1
JFK: 1
LGA: 1
PHL: 1
 

 

 

 

Highs:
 

TEB: 100
EWR: 100
LGA: 99
PHL: 97
ACY: 97
New Brnswck: 96
ISP: 96
NYC: 95
TTN: 95
JFK: 95 * no intra hour readings
BLM: 92 * missing most data (7/29-7/30)