ChescoWx

Imagine if we could actually see the actual real raw US average temperature trend? 

On 6/28/2025 at 5:48 AM, chubbs said:

The Chester County deep-dive has shown that a county station average is a terrible way to evaluate NOAA. The available stations aren't designed to produce county averages by simple averaging and the stations change with time. The average shelf life of a coop station isn't very long. Even stations with long-term records have station moves and equipment changes.

The NOAA method is well proven for getting the right answer from a constantly changing station network. If the stations didn't change then simpler methods would also work; but, as we have seen in Chester County the simpler methods breakdown when there are large changes in the station network with time.

 

fixed it for you - The NOAA method is well proven for getting the DESIRED answer

Look at how close these 2 stations are in NE Chesco....certainly not representative of the county climate

The Phoenixville and Spring City sites that are now the only remaining NWS COOP stations of course run warmer than all other stations in 24 of the last 25 years. On average a 0.8 degree variation. With those sites running as much as 3 degrees too warm in one year and at least a degree warmer in 15 of those years!! Makes very little sense as these 2 stations are much lower in elevation and near each other in the Northeastern section of Chester County....yet these are the 2 stations that NCEI will use to calculate their county averages.....call me stunned!! LOL! 

10 minutes ago, TheClimateChanger said:

 It appears those values are calculated only by adding in stations that aren't included in the NOAA analysis - mesonets, secondary airports (AWOS sites?), perhaps personal weather stations. I'm not sure what's going on.

 

Below are the stations used and dates operational

A view of our summers by decade here in the Philly burbs of Chester County....without the typical chilling alterations of the past and warming the current....as always not much warming at all.

A beautiful stretch of weather is underway for the 4^th of July holiday weekend! Today will be our warmest day until Sunday. We should see highs today in the mid 80’s. We cool a little tomorrow to slightly below average temperatures for the 4^th of July with our highs in the lower 80’s. Our next chance of rain looks to arrive by Tuesday evening.

Here in June in Chester County PA finished with an average temperature across the county of 71.9 degrees. This was the 26th warmest June since records began in 1893. Of note 19 of the 25 warmest June months occurred prior to 1980. Below is the climate summary by Station for June 2025.

Here in June in Chester County PA finished with an average temperature across the county of 71.9 degrees. This was the 26th warmest June since records began in 1893. Of note 19 of the 25 warmest June months occurred prior to 1980. Below is the climate summary by Station for June 2025.

2.11" of rain so far today in East Nantmeal and 2.94" since yesterday.

We generally saw between 1" to as much as nearly 3" of rain across Chester County last evening and overnight. Some spots like West Bradford received 2.92" of rain with Glenmoore at 2.06" and East Nantmeal with 1.73" of rain. We could see quite a bit more rain later today as a cold front approaches from the west tonight. The NWS has issued a Flash Flood Watch from 2pm through 2am Wednesday. The NWS has a forecast of another 1" to 2" of rain but some of the shorter-range models show even more across some spots. Today will be our warmest day of the week with highs in the upper 80's. We fall back pretty close to normal or a bit below tomorrow with near normal temperatures through Saturday before we warm back to a few degrees above normal by next Sunday. No 90-degree temperatures are expected at least in the higher spots of the county throughout the week.

Another warm and humid day with temperatures well up into the 80's. Rain chances are increasing tonight and through tomorrow. Some spots could pick up another 1" to 2" adding on to our rain surplus so far here in 2025. We turn a bit more comfortable with lower humidity and temperatures not far from normal for early July as we head toward the holiday weekend.

Another warm and humid day with temperatures well up into the 80's. Rain chances are increasing tonight and through tomorrow. Some spots could pick up another 1" to 2" adding on to our rain surplus so far here in 2025. We turn a bit more comfortable with lower humidity and temperatures not far from normal for early July as we head toward the holiday weekend.

Yearly rainfall surplus here in Chester County through yesterday is +0.33" - Actual 24.24" vs. Average 23.91"

We picked up just 0.05" of rain last night with the thundershower that rolled through. Today looks sunny and dry with temperatures a few degrees above normal in the mid to upper 80's. We remain humid. Shower chances increase by tomorrow afternoon and evening. We then look dry and mostly sunny for the remainder of the week with highs not too far from average for the start of July with temperatures in the mid 80's. No significant heat with highs in the 90's for at least the next week to 10 days.

We picked up just 0.05" of rain last night with the thundershower that rolled through. Today looks sunny and dry with temperatures a few degrees above normal in the mid to upper 80's. We remain humid. Shower chances increase by tomorrow afternoon and evening. We then look dry and mostly sunny for the remainder of the week with highs not too far from average for the start of July with temperatures in the mid 80's. No significant heat with highs in the 90's for at least the next week to 10 days.

After the fog burns off this morning we should see some sun returning this afternoon before more showers arrive after 8pm this evening. We should be much warmer and humid compared to yesterday's near record low maximum temperatures. We should see readings a few degrees above normal in the mid to upper 80's. Sunnier tomorrow with less humidity and temperatures near today's levels. Next rain chances arrive by Monday night and into Tuesday morning. Sunny weather returns by Wednesday with temperatures next week close to normal levels for early July. No sign of any 90-degree readings across Chester County for at least the next week to 10 days.

Yesterday high temps across Chester County ranged from 64.0 at East Nantmeal and 64.6 at Glenmoore to the highest being 69.3 at West Chester. The readings at Glenmoore and East Nantmeal were tied for the 5th coldest high temperature in Chester County weather history since records began in 1893. The top 5 are West Chester 61 (1938) / Coatesville 1SW 63 (1942) / West Chester 63 (1968) / Coatesville 1SW 63 (1968) and Phoenixville 64 (1898). For many spots including Chester Springs / Devault / Glenmoore / Longwood Gardens / KMQS Coatesville, East Nantmeal and KOQN West Chester it was the all-time record for the date.

Only 64.0 for the high temp so far today this is the 5th lowest daily maximum for the date here in Chester County since 1893. Another 0.57" of rain so far here in East Nantmeal our 2 day total has been 1.64"

Only 64.0 for the high temp so far today this is the 5th lowest daily maximum for the date here in Chester County since 1893. Another 0.57" of rain so far here in East Nantmeal our 2 day total has been 1.64"

21 minutes ago, TimB said:

I’ll post your daily summaries for the 3 days you weren’t here:

Monday: high 92.1, low 75.7 (+10)

Tuesday: high 93.1, low 76.6 (+11)

Wednesday: high 91.6, low 73.4 (+9)

Thanks Tim!! Was a little lax of late as I just got back yesterday PM from an England/Ireland Trip...a little cooler over there!! The actual departure from normal for me were actually a bit higher at + 13.0 / +13.4 and +9.9 respectively!

Rainfall amounts were pretty variable last night across Chester County. We saw as much as 2.35" at Nottingham and 2.17" at Atglen to as little as 0.17" at Devault. It’s much cooler today with temperatures in the low 70's. Across the higher spots of the County we may not see another 90-degree reading until the middle of July. Rain chances to ramp up a bit again tonight and again on Saturday night. We warm up to the upper 80's on Sunday before we see temperatures near normal in the mid 80's for much of the next week.