E PA/NJ/DE Spring 2026 Obs/Discussion

[ChescoWx]

Lows this morning were not too far from record cold levels for the final day of May. The lowest was the 38-degree reading at Warwick Township. During our last 37 days we have seen 26 of those days with below normal temperatures here in East Nantmeal. This pattern looks to it will continue through mid-week before we finally see temperatures warming to above normal by the end of the work week. Unfortunately there is no rain in site.

[RedSky]

42F low this am

 

[PhiEaglesfan712]

May average temperature finishes at 65.6 at PHL, which is 1.3 degrees above the 1991-2020 average (1.7 degrees above the 1981-2010 average).

Meterological spring average temperature finishes at 57.8 at PHL, which is tied for the 3rd warmest spring on record (with 1921, and behind only 2010 and 2012).

[RedSky]

NYC finished exactly normal for May

48F low

 

[ChescoWx]

On 6/1/2026 at 8:17 AM, PhiEaglesfan712 said:

May average temperature finishes at 65.6 at PHL, which is 1.3 degrees above the 1991-2020 average (1.7 degrees above the 1981-2010 average).

Meterological spring average temperature finishes at 57.8 at PHL, which is tied for the 3rd warmest spring on record (with 1921, and behind only 2010 and 2012).

I am compiling the final averages but it looks like Chester County will finish around a 1 degree below the 1991-2020 average for the Month of May

[ChescoWx]

Today will be the 11th of the last 13 days with below normal temperatures. Sunny and dry through Saturday. We should finally see some warmer than average temperatures by the end of the week and into the weekend. Rain chances look to increase by Sunday.

[ChescoWx]

Below is the May 2026 Chester County Climate Summary. We finished May with an average temperature of 60.8 degrees across all stations. This was 0.7 degrees below the 1991-2020 average May temperature of 61.5 degrees. This was the 56th coldest May in 134 years of records back to 1893.

[ChescoWx]

Since 1893 we have seen a cooling trend during the month of May 

[ChescoWx]

Of note here in the philly burbs of Chester County PA Spring of 2026 was the 14th warmest Spring since 1893 - conversely Winter 2025-26 was our 14th coldest! Our weather does have a way of balancing out! Below is our Spring Temperature trends since 1893....only some slight warming is shown.