ChescoWx

We finished June with temperatures for the month only slightly above normal. Our extremely hot stretch of weather begins today and will continue through the weekend. The hottest days look to be both Thursday and Friday where we will be in the upper 90's on the ridges and near or above 100 degrees in the valley locales. Shower chances increase by July 4th night and continue into Sunday and Monday. This will start to trim the extremely high temperatures and by next Tuesday we will be back to near normal with highs in the mid 80's.

Today should be our last sub 90 degree high until Monday. Mid to upper 80's today rising into the low to mid 90's tomorrow and then upper 90's in higher spots to near 100 in our valley locations both Thursday and Friday. Shower chances increase later July 4th with the days trending slightly cooler with highs by Monday in the upper 80's.

Today should be our last sub 90 degree high until Monday. Mid to upper 80's today rising into the low to mid 90's tomorrow and then upper 90's in higher spots to near 100 in our valley locations both Thursday and Friday. Shower chances increase later July 4th with the days trending slightly cooler with highs by Monday in the upper 80's.

Of course station location placement and relative elevation

With a chance that some locations could see a 100-degree day later this week I went back and analyzed 30 temperature stations across the area to see just how rare such a day has become. A 100-degree day is a rare occurrence across most spots across the County. With the potential being even more rare across the relatively higher ridge stations above 595 ft. In fact the last time any ridge location station saw a 100-degree reading was 15 years ago back on July 22, 2011. Of the 18 current stations across the area that report temperatures 9 of these have never recorded such a day. Our lowest elevation stations at Phoenixville and nearby Spring City both recorded a 100+ day last June. To illustrate how different the temperature elevation impact can be on June 26, 2025 while Spring City (256 ft ASL) was hitting the century mark....not too far away at Glenmoore DEOS (620 FT ASL) but 400 feet higher the high was 10 degrees cooler at "only" 90.6

With a chance that some locations could see a 100-degree day later this week I went back and analyzed 30 temperature stations across the area to see just how rare such a day has become. A 100-degree day is a rare occurrence across most spots across the County. With the potential being even more rare across the relatively higher ridge stations above 595 ft. In fact the last time any ridge location station saw a 100-degree reading was 15 years ago back on July 22, 2011. Of the 18 current stations across the area that report temperatures 9 of these have never recorded such a day. Our lowest elevation stations at Phoenixville and nearby Spring City both recorded a 100+ day last June. To illustrate how different the temperature elevation impact can be on June 26, 2025 while Spring City (256 ft ASL) was hitting the century mark....not too far away at Glenmoore DEOS (620 FT ASL) but 400 feet higher the high was 10 degrees cooler at "only" 90.6

With a chance that some locations could see a 100-degree day later this week I went back and analyzed 30 temperature stations across the area to see just how rare such a day has become. A 100-degree day is a rare occurrence across most spots across the County. With the potential being even more rare across the relatively higher ridge stations above 595 ft. In fact the last time any ridge location station saw a 100-degree reading was 15 years ago back on July 22, 2011. Of the 18 current stations across the area that report temperatures 9 of these have never recorded such a day. Our lowest elevation stations at Phoenixville and nearby Spring City both recorded a 100+ day last June. To illustrate how different the temperature elevation impact can be on June 26, 2025 while Spring City (256 ft ASL) was hitting the century mark....not too far away at Glenmoore DEOS (620 FT ASL) but 400 feet higher the high was 10 degrees cooler at "only" 90.6

Our extreme heat watch goes into effect starting on Wednesday. The next couple of days will be close to average for the end of June. Most spots should reach the low 90's starting on Wednesday with the peak hot days being both Thursday and Friday with highs in the upper 90's in most spots to near 100 in lower elevation valley locations. Storm chances increase a little on Independence Day and will help trim temperatures a little by the end of next weekend.

Our extreme heat watch goes into effect starting on Wednesday. The next couple of days will be close to average for the end of June. Most spots should reach the low 90's starting on Wednesday with the peak hot days being both Thursday and Friday with highs in the upper 90's in most spots to near 100 in lower elevation valley locations. Storm chances increase a little on Independence Day and will help trim temperatures a little by the end of next weekend.

You will no doubt see and hear a lot of alarmist news stories later this week saying the current heatwave is "unprecedented" across the Eastern US. However, as confirmed in a new peer reviewed study in the Journal of Theoretical and Applied Climatology, Christy (2026) “The results indicate that extremes in heat-related metrics for daily TMax in the summer have not increased and in fact often show modest declines since 1899, due mostly to the early heat events during 1925-1954” Those period of years are also the hottest period here in Chester County PA. So over the last century, there has been no evidence of an increase in heatwaves in the United Stares no matter what you will see on your TV later this week. It is simply called summer!! Stay cool!!

A really interesting statistic for the entire USA which exactly mirrors the data I share here from the philly burbs of Chester County. This below analysis measures not the typical metric of 90+ days but unusual hot periods of at least 4 days on average across the entire country where the average temperature reaches a level based on historical records that would be expected to only occur once every 10 years. Look how much hotter the entire nation was back in 1930's and 1940's compared to today! No matter how much we hear about how hot it is today we have still not reached that peak heating from the 1930 through 1942 period which matches the hottest period here in Chester County PA.

A really interesting statistic for the entire USA which exactly mirrors the data I share here from the philly burbs of Chester County. This below analysis measures not the typical metric of 90+ days but unusual hot periods of at least 4 days on average across the entire country where the average temperature reaches a level based on historical records that would be expected to only occur once every 10 years. Look how much hotter the entire nation was back in 1930's and 1940's compared to today! No matter how much we hear about how hot it is today we have still not reached that peak heating from the 1930 through 1942 period which matches the hottest period here in Chester County PA.

A really interesting statistic for the entire USA which exactly mirrors the data I share here from Chester County. This below analysis measures not the typical metric of 90+ days but unusual hot periods of at least 4 days on average across the entire country where the average temperature reaches a level based on historical records that would be expected to only occur once every 10 years. Look how much hotter the entire nation was back in 1930's and 1940's compared to today! No matter how much we hear about how hot it is today we have still not reached that peak heating from the 1930 through 1942 period which matches the hottest period here in Chester County PA.

Plenty of lows in the 50's across the area this morning with the lowest being the 50.0 at the Warwick DEOS. Today will be our 9th day in the last 10 with slightly below normal temperatures. Great weather through Thursday before rain chances increase again by Thursday night into Saturday morning. We should slowly warm up next week to above normal temperatures as we close out the month of June.

Plenty of lows in the 50's across the area this morning with the lowest being the 50.0 at the Warwick DEOS. Today will be our 9th day in the last 10 with slightly below normal temperatures. Great weather through Thursday before rain chances increase again by Thursday night into Saturday morning. We should slowly warm up next week to above normal temperatures as we close out the month of June.

1.34" in East Nantmeal since yesterday

Some area rain amounts so far from this afternoon. KOQN 1.30"/ East Nantmeal 0.95" / Devault 0.75" / Warwick 0.46" / Chester Springs 0.11" / KMQS 0.03" / Glenmoore 0.08" / Nottingham 0.20" Kennett Square 0.30" / West Chester DEOS 0.71"

A Flood watch is in effect starting at 2pm today. Rain will arrive from west to east later this afternoon. We could see some thunderstorms. There is still some uncertainty to where the heaviest rain will fall. For now it appears from 0.5" across NW Chesco to over an inch possible toward SE Chester County. Highs today and tomorrow will be several degrees below normal with the clouds and rain. We dry out later Tuesday through much of Thursday before more rain arrives Thursday night into Friday.

A Flood watch is in effect starting at 2pm today. Rain will arrive from west to east later this afternoon. We could see some thunderstorms. There is still some uncertainty to where the heaviest rain will fall. For now it appears from 0.5" across NW Chesco to over an inch possible toward SE Chester County. Highs today and tomorrow will be several degrees below normal with the clouds and rain. We dry out later Tuesday through much of Thursday before more rain arrives Thursday night into Friday.

Happy Father's Day to all the dad's out there! Plus happy first day of summer which began this morning at 4:24am. Another great weather day is on tap across the area. Temperatures are not far from typical levels for very early summer. Rain chances to ramp up by later tomorrow before we clear out for mid-week. Shower chances return again by Thursday afternoon.

Happy Father's Day to all the dad's out there! Plus happy first day of summer which began this morning at 4:24am. Another great weather day is on tap across the area. Temperatures are not far from typical levels for very early summer. Rain chances to ramp up by later tomorrow before we clear out for mid-week. Shower chances return again by Thursday afternoon.

Plenty of 50's and even 40's this morning with our typical cold valley location Warwick Twp reaching 49.8 degrees. To contrast that just a couple miles south of there but a few hundred feet higher in East Nantmeal Twp. we only reached 59.9 (over 10 degrees warmer). Great weather continues today and tomorrow with highs close to normal around 80 degrees. It still looks like Monday will bring some beneficial rains to the area with at least an inch of rain for many spots still likely. We turn drier and cooler for the rest of the work week with highs a couple of degrees below normal.

Plenty of 50's and even 40's this morning with our typical cold valley location Warwick Twp reaching 49.8 degrees. To contrast that just a couple miles south of there but a few hundred feet higher in East Nantmeal Twp. we only reached 59.9 (over 10 degrees warmer). Great weather continues today and tomorrow with highs close to normal around 80 degrees. It still looks like Monday will bring some beneficial rains to the area with at least an inch of rain for many spots still likely. We turn drier and cooler for the rest of the work week with highs a couple of degrees below normal.

Below normal temperatures for most of the next week with beneficial rains arriving for much of the area by late Sunday into Monday. Sun should return this afternoon with lower humidity. The weekend looks great with highs in the upper 70's to near 80 degrees and lows in the 50's. The rain Monday could be significant with most models painting as much as 1" to 1.5" of needed rain.

Below normal temperatures for most of the next week with beneficial rains arriving for much of the area by late Sunday into Monday. Sun should return this afternoon with lower humidity. The weekend looks great with highs in the upper 70's to near 80 degrees and lows in the 50's. The rain Monday could be significant with most models painting as much as 1" to 1.5" of needed rain.