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September 2021


wdrag
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When I checked the Newark readings at 4, it showed 70 degrees and the wind NW at 76mph. Now the temperature at Newark is 67 degrees. So I am wondering if the 70 degree reading was incorrect. It certainly seemed like an outlier temperature reading as I checked numerous local stations in the area at 4PM and the highest I could find was Caldwell NJ at 67.

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At 2:51 pm, the temperature reached a daily high of 70° at Newark. That extended Newark's record streak with high temperatures of 70° or above to 123 consecutive days.

New York City is finishing September with a mean temperature of 70.3° (1.1° above normal). As of 7 pm, that figure is 70.4°, but it is likely to fall to 70.3° as the mercury dips below 58° late this evening. 2021 is the 6th out of the last 7 years during which September has had a mean temperature of 70° or above in New York City. Prior to 2000, New York City saw such warmth on average once every five years.

What will likely turn out to be a warm October will start off on a cool note. Temperatures will rebound into the upper 60s and lower 70s during the afternoon. Warmer temperatures will return this weekend. Next week, the chance of precipitation will increase.

There is strong consensus on the long-range guidance that October will be an unseasonably warm month. The first half could feature much above normal readings in the Northern Plains into Central Canada. Bismarck could have one of its 5 warmest opening weeks in October on record. Overall, the Middle Atlantic and southern New England areas appear to be in line with a warmer to much warmer than normal October (a general 2°-4° above normal).

Fall 2021 will likely be wetter to much wetter than normal in the northern Middle Atlantic region. Since 1869, there have been 9 August cases where New York City picked up 20.00" or more rainfall during the summer. Two thirds of those cases (and 4/5 of those with summer mean temperatures of 73.0° or above) had 17.00" or more fall precipitation in New York City. 2011 is probably the closest match in terms of precipitation and a nearly identical summer mean temperature. Mean fall precipitation for those 9 cases was 14.86". The median was 17.35". The 1991-2020 normal value is 12.27".

Following very wet July-September periods, winter (December-February) precipitation has typically been near or below normal. The most recent exception was winter 2018-19.

The ENSO Region 1+2 anomaly was +0.2°C and the Region 3.4 anomaly was -0.3°C for the week centered around September 22. For the past six weeks, the ENSO Region 1+2 anomaly has averaged +0.05°C and the ENSO Region 3.4 anomaly has averaged -0.43°C. Neutral ENSO conditions will likely prevail through September. Afterward, La Niña conditions could begin to develop during October.

The SOI was +18.25 today.

The preliminary Arctic Oscillation (AO) figure was -1.441 today.

On September 28 the MJO was in Phase 4 at an amplitude of 1.420 (RMM). The September 27-adjusted amplitude was 1.349 (RMM).

 

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Another top warmest September across the area.


 

Time Series Summary for NEWARK LIBERTY INTL AP, NJ - Month of Sep
Click column heading to sort ascending, click again to sort descending.
Rank
Year
Mean Avg Temperature 
Missing Count
1 1961 74.5 0
2 2005 73.5 0
3 2015 73.4 0
4 2021 72.5 0
5 2016 71.8 0
- 1971 71.8 0
6 2010 71.6 0
7 1959 71.5 0
8 2018 71.4 0
9 2011 71.2 0
10 1973 71.0 0
- 1931 71.0 0


 

Time Series Summary for LAGUARDIA AIRPORT, NY - Month of Sep
Click column heading to sort ascending, click again to sort descending.
Rank
Year
Mean Avg Temperature 
Missing Count
1 2005 74.9 0
2 2015 74.1 0
3 2016 73.8 0
4 1961 73.6 0
5 2007 73.0 0
6 2018 72.8 0
7 2021 72.7 0
8 2010 72.5 0
- 1959 72.5 0
9 2019 72.1 0
10 1998 71.6 0


 

Time Series Summary for JFK INTERNATIONAL AIRPORT, NY - Month of Sep
Click column heading to sort ascending, click again to sort descending.
Rank
Year
Mean Avg Temperature 
Missing Count
1 2015 73.0 0
- 1961 73.0 0
2 2005 72.1 0
3 1971 71.8 0
4 1959 71.3 0
5 2016 71.1 0
6 1983 71.0 0
7 2021 70.7 0
- 2018 70.7 0
8 2017 70.6 0
9 2010 70.5 0


 

Time Series Summary for ISLIP-LI MACARTHUR AP, NY - Month of Sep
Click column heading to sort ascending, click again to sort descending.
Rank
Year
Mean Avg Temperature 
Missing Count
1 2015 70.9 0
2 2005 70.2 0
3 2018 69.8 0
4 2021 69.6 0
- 1980 69.6 0
5 2017 69.0 0
- 2011 69.0 0
6 2016 68.9 0
7 1998 68.6 0
8 2010 68.3 0
9 1983 68.1 0
- 1971 68.1 0
10 2008 67.7 0


 

Time Series Summary for IGOR I SIKORSKY MEMORIAL AIRPORT, CT - Month of Sep
Click column heading to sort ascending, click again to sort descending.
Rank
Year
Mean Avg Temperature 
Missing Count
1 2015 71.1 0
2 2016 70.6 0
3 1961 70.5 0
4 2011 70.1 0
5 2021 69.8 0
- 2005 69.8 0
6 2018 69.5 0
7 1959 69.4 0
8 2010 69.3 0
9 2017 69.1 0
10 1971 69.0 0
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