ChescoWx

Happy 4th of July to all of you! Below is the history of July 4th weather since 1893 here in Chester County PA. Overall we have seen a flat trend in average temperature / a slight cooling trend for high temperatures and a slight warming trend for overnight low temperatures for the holiday. The hottest July 4th was back in 1966 the chilliest was in 1978.

Happy 4th of July to all of you! Below is the history of July 4th weather since 1893 here in Chester County PA. Overall we have seen a flat trend in average temperature / a slight cooling trend for high temperatures and a slight warming trend for overnight low temperatures for the holiday. The hottest July 4th was back in 1966 the chilliest was in 1978.

Thank you so much!!! I appreciate all the folks that post in this forum and others!!

Happy Independence Day to all!!! Well while today will still be sweltering it will be a few degrees cooler than yesterday. Real relief arrives tomorrow as temperatures fall back to near normal levels for early July with highs in the mid-80's. We will see temperatures fall to below average by Monday and continue through the middle of the week. Shower chances start to increase this evening, but I think the best chances for rain will be after fireworks. Rain chances really increase Sunday night into Monday morning. Some spots could see between 1 to 2 inches of much needed rain.

Too many folks don't know what a great tool that is to get past the junk we don't care about - glad you can mute me Voyager!! That said I am only 7 miles from Lancaster County so like you I cross over....

Happy Independence Day to all!!! Well while today will still be sweltering it will be a few degrees cooler than yesterday. Real relief arrives tomorrow as temperatures fall back to near normal levels for early July with highs in the mid-80's. We will see temperatures fall to below average by Monday and continue through the middle of the week. Shower chances start to increase this evening, but I think the best chances for rain will be after fireworks. Rain chances really increase Sunday night into Monday morning. Some spots could see between 1 to 2 inches of much needed rain.

From Ryan Maue x feed on the NYT article: "It's official: without climate change, the ongoing Eastern United States heat wave is "virtually impossible" Climate scientists performed an autopsy of this week's weather and determined that it could not have happened in the past 500-years w/o the burning of fossil fuels" Q. Can the they do an autopsy the hottest decade on record the 1930's and explain that one for us too? RM. Their study started in 1950, so anything that happened before would not be relevant." LOL!!

1st 100 degree reading here on the island in SIC since I have had a station 2012

Highs so far at the professional stations around Chesco - Atglen DEOS 95.6 / Glenmoore DEOS 96.7 / Warwick DEOS 97.8 / West Chester DEOS 97.5/ Nottingham DEOS 97.5 / Devault DEOS 97.5 / Chester Springs DEOS 98.4 / West Bradford DEOS 96.6 / Avondale 2N 96.3 / West Grove DEOS 95.5 / KMQS Airport 95.5 / KOQN Airport 98.6

Highs so far at the professional stations around Chesco - Atglen DEOS 95.6 / Glenmoore DEOS 96.7 / Warwick DEOS 97.8 / West Chester DEOS 97.5/ Nottingham DEOS 97.5 / Devault DEOS 97.5 / Chester Springs DEOS 98.4 / West Bradford DEOS 96.6 / Avondale 2N 96.3 / West Grove DEOS 95.5 / KMQS Airport 95.5 / KOQN Airport 98.6

East Nantmeal current temp is 92.7 the high has been 93.0. This is the 3rd consecutive day I have reached 90 degrees. This marks only the 8th "heatwave" I have recorded in my 23 summers here in EN since 2004. Of note my poorly sited rooftop Tempest has gone 95.4 / 98.2 / 94.8 the last 3 days vs my VP Pro 2 with 93.0/94.8/91.0

East Nantmeal current temp is 92.7 the high has been 93.0. This is the 3rd consecutive day I have reached 90 degrees. This marks only the 8th "heatwave" I have recorded in my 23 summers here in EN since 2004. Of note my poorly sited rooftop Tempest has gone 95.4 / 98.2 / 94.8 the last 3 days vs my VP Pro 2 with 93.0/94.8/91.0

Below is the June and 1st Half of 2026 Chester County Area Climate Summary. Overall the county finished with a slightly above average temperature of 70.8 degrees or 0.6 degrees above the 1991-2020 climate baseline for June of 70.2 degrees. When using the entire climate dataset since 1893 we finished only +0.4 degrees above our overall 134 year average June temperature which is 70.4. This was 1.2 degrees cooler than June 2025 and our coolest June since the 67.4 degree average in June 2023. This was our 61st warmest June over the last 134 years of county climate data. Through the 1st 6 months of the year our average temperature was 48.0 degrees. This is 0.4 degrees below the 1991-2020 baseline and 0.1 degree over the 1893 - 2025 baseline. This represents our coldest start to a year since 2015. Overall this is the 66th warmest 1st half of a year over the last 134 years. Average precipitation across all stations was 3.11" this is 1.20" the 1991-2020 baseline and 1.02" below the overall average since 1893. For the 1st half of the year county precipitation has averaged 15.34" this is 6.95" below the 1991-2020 baseline of 22.29" and 6.82" below the 1893-2026 all years average of 22.16". This is our 7th driest average precipitation total with the lowest being the 13.82" average for the first half of 1963.

Below is the June and 1st Half of 2026 Chester County Area Climate Summary. Overall the county finished with a slightly above average temperature of 70.8 degrees or 0.6 degrees above the 1991-2020 climate baseline for June of 70.2 degrees. When using the entire climate dataset since 1893 we finished only +0.4 degrees above our overall 134 year average June temperature which is 70.4. This was 1.2 degrees cooler than June 2025 and our coolest June since the 67.4 degree average in June 2023. This was our 61st warmest June over the last 134 years of county climate data. Through the 1st 6 months of the year our average temperature was 48.0 degrees. This is 0.4 degrees below the 1991-2020 baseline and 0.1 degree over the 1893 - 2025 baseline. This represents our coldest start to a year since 2015. Overall this is the 66th warmest 1st half of a year over the last 134 years. Average precipitation across all stations was 3.11" this is 1.20" the 1991-2020 baseline and 1.02" below the overall average since 1893. For the 1st half of the year county precipitation has averaged 15.34" this is 6.95" below the 1991-2020 baseline of 22.29" and 6.82" below the 1893-2026 all years average of 22.16". This is our 7th driest average precipitation total with the lowest being the 13.82" average for the first half of 1963.

Below is the June and 1st Half of 2026 Chester County Area Climate Summary. Overall the county finished with a slightly above average temperature of 70.8 degrees or 0.6 degrees above the 1991-2020 climate baseline for June of 70.2 degrees. When using the entire climate dataset since 1893 we finished only +0.4 degrees above our overall 134 year average June temperature which is 70.4. This was 1.2 degrees cooler than June 2025 and our coolest June since the 67.4 degree average in June 2023. This was our 61st warmest June over the last 134 years of county climate data. Through the 1st 6 months of the year our average temperature was 48.0 degrees. This is 0.4 degrees below the 1991-2020 baseline and 0.1 degree over the 1893 - 2025 baseline. This represents our coldest start to a year since 2015. Overall this is the 66th warmest 1st half of a year over the last 134 years. Average precipitation across all stations was 3.11" this is 1.20" the 1991-2020 baseline and 1.02" below the overall average since 1893. For the 1st half of the year county precipitation has averaged 15.34" this is 6.95" below the 1991-2020 baseline of 22.29" and 6.82" below the 1893-2026 all years average of 22.16". This is our 7th driest average precipitation total with the lowest being the 13.82" average for the first half of 1963.

This is excellent thank you!! I have looked at this in the past but you have really detailed and packaged this nicely!!! most appreciated!! I will dive into this!!

The low here in East Nantmeal was only 77.2 degrees. This is the 3rd highest minimum temperature since 2004. Another hot day today with temperatures close to what they were yesterday - mid 90's to near 100 degrees. Small chances of some showers tonight and we begin to slowly trim the heat with highs tomorrow closer to the mid-90's. Shower at T-storm chances ramp up later tomorrow and at night. We then fall back closer to normal temperatures on Sunday before we trend to below normal temperatures by both Monday and Tuesday.

The low here in East Nantmeal was only 77.2 degrees. This is the 3rd highest minimum temperature since 2004. Another hot day today with temperatures close to what they were yesterday - mid 90's to near 100 degrees. Small chances of some showers tonight and we begin to slowly trim the heat with highs tomorrow closer to the mid-90's. Shower at T-storm chances ramp up later tomorrow and at night. We then fall back closer to normal temperatures on Sunday before we trend to below normal temperatures by both Monday and Tuesday.

77.2 for the low in EN our 3rd highest min since 2004! We are off to the races today!

LOL!!! Ruh Roh.... sorry Redsky he may have had a couple when he posted this..... but in addition to my station in SE PA in Chester County - the professional stations at Nottingham DEOS, Atglen DEOS, KMQS Coatesville Airport, Glenmoore DEOS, Nottingham DEOS, West Grove DEOS all failed to hit 98 degrees today. Me thinks all these professional station thermometers are not wrong!! Thoughts RedSky??

True and my lows are routinely higher than most....ridge vs valley microclimates in this area.

This is only about my station readings @Stebosaid my readings are 3 to 5 degrees too low...that is just fake news on his part as I have clearly shown. Not sure what convo you are talking about - assuming it is the chilling of the 1930's thru 1950's historical data correct? thanks!

Thanks Mount Joy! I have used the exact same equipment and location for 23 years.

Folks that live here understand the difference....and the data backs it up. thanks!

Of course see below. You do realize that the facts and actual stats clearly show with a significant p-value that the fact remain that my EN station and the Chester County PA USCRN are statistically exactly the same with over 7,000 days of daily historical data since 2007. Facts have nothing to do with a degreed meteorologist view or "thoughts" on the actual data. You may not like it but it is factual and they don't care about your feelings.