ChescoWx

0.30" of rain here in East Nantmeal since yesterday with 0.17" since midnight. Today will be unseasonable chilly and wet day with temps in some higher spots remaining in the 40's. A brief break tomorrow with some sun before rain returns late at night into Sunday. One more nice day on Monday before showers return for much of the remainder of the week. Chester County daily records for today: High 94 degrees at Coatesville 1SW (1896) / Record low 27 degrees at Coatesville 1SW and Devault 1W (1966) / Rain 1.76" at Coatesville 2W (1990)

0.30" of rain here in East Nantmeal since yesterday with 0.17" since midnight. Today will be unseasonable chilly and wet day with temps in some higher spots remaining in the 40's. A brief break tomorrow with some sun before rain returns late at night into Sunday. One more nice day on Monday before showers return for much of the remainder of the week. Chester County daily records for today: High 94 degrees at Coatesville 1SW (1896) / Record low 27 degrees at Coatesville 1SW and Devault 1W (1966) / Rain 1.76" at Coatesville 2W (1990)

I guess if you think an average of 16.6 days in the 1950's dropping to 13.7 in the 2000's is an uptrend not much we can talk about. The 2010's only have complete Glenmoore data....

UHI post obs adjustments by year

So while we often talk about the chilling adjustments done to older data for their biases. Where is the cooling UHI adjustments for PHL???? I am told NCEI accounts for known UHI bias. Do we think there is no UHI impact at PHL?? Tell me what I am missing as I know you will! LOL!!! Below is an analysis of the PHL Airport average annual temperature from 1941 through 2023. I have overlaid the adjusted NCEI temperatures vs the actual reported averages. Why in the last 30 years have the PHL Airport Temps been adjusted upward in 19 of the last 30 years despite UHI?? And the overall cumulative adjustments over those years has been an overall net upward adjustment of 3.45 degrees in PHL actual reported temps. Thoughts????

The city was also way less built up and the UHI factor was not nearly so impactful as today. Regarding near the old normal of 14 days before UHI PHL has been close or below that figure in 2014 (19) / 2009 (15) / 2004 (9) / 2000 (10) / 1996 (7) and 1992 (14)

Climate changer couple things. See above the Coatesville 2W trend is not positive over the period. Just to clarify I have used the same equipment for 21 years in East Nantmeal so no changes or variations there!! Does that help?

Because we actually do have the data let's review Charlie's statement that "the older stations with longer records: GlenmooreCoop, Honey Brook and Coatesville,all have a similar and increasing level of 90F days over multiple decades" Well the actual data Charlie references is below (the yellow highlights are incomplete decades) However, in reality all of the mentioned stations they are the opposite of trending toward an increasing level of 90 degree days. In fact they have trended downward in 90+ days in the complete decades since the 1980's!! Again so different from the UHI problems at PHL. But overall absolutely no clear trend -simply cyclical changes by decade as we have always seen.

This is not difficult Charlie the bias in the overall Chesco data is as of the last couple years now actually biased to the warmer lower elevation locales not the higher! In 2023 there are 11 lower elevation spots vs 6 higher. This is why we now have split the data to account for such biases.

An increasingly chilly day with the wind becoming onshore from the chilly atlantic waters today. Shower chances increase this afternoon. Tomorrow will be a very raw day for May with temps in the higher spots of Chester and Berks counties struggling to escape the 40's to around 50 degrees. Saturday looks like the driest day of the weekend. But the weekend as a whole will not be a washout. Chester County wide records for today: High 96 degrees at Phoenixville (1936) / Low 25 degrees at Coatesville 1SW (1947) / Rain 2.46" at Glenmoore (1992)

An increasingly chilly day with the wind becoming onshore from the chilly atlantic waters today. Shower chances increase this afternoon. Tomorrow will be a very raw day for May with temps in the higher spots of Chester and Berks counties struggling to escape the 40's to around 50 degrees. Saturday looks like the driest day of the weekend. But the weekend as a whole will not be a washout. Chester County wide records for today: High 96 degrees at Phoenixville (1936) / Low 25 degrees at Coatesville 1SW (1947) / Rain 2.46" at Glenmoore (1992)

Do better Charlie! No data has been "subbed out" all data is included and split between individual observation sites. I have even broken it down by elevation to address any relative elevation biases. And of course my spotter data is a minute part and not event the coldest historical locale in Chester County PA data set of 27 stations.

Ruh roh! More problems for the climate doomers!! A new Monmouth University poll reveals that the percentage of Americans ages 18-34 who view [man induced] climate change as a very serious problem has fallen by 17 % points in just the last 3-years, from 67% in 2021 to 50% this year. Concern among folks aged 34-54 declined from 48% to 44%, and ages 55+ down to 44% from 54% over the same period. Support for government action to reduce greenhouse gas (GHG) emissions in the 18-34 age demographic fell from 82% in 2018 and 80% in 2021 to 62% in the latest poll, a whopping 18-20 percentage point drop. For the ages 35-54 group, it stands at 55% down from 62% in 2021 and 66% in 2018. Good to see the non-homogenized raw actual data starting to change minds!! Climate change is real and constant no one can deny this....but folks are indeed catching on that there is not a climate crisis and of course nothing at all to be alarmed at!

My data is of course a small minority piece of the data and I am not even the coolest station in the reporting set. My station is appropriately sited according to site and exposure standards with the station location that is in fact "typical of the surrounding area". The standards go on to say that "when possible" (it is not in my township) four times the height of any obstruction (tree, fence, building, etc.). The sensor should be at least 100 feet from any paved or concrete surface. it is. My data has also been validated by the Gladstone quality check for weather data.

Nope! nothing dropped out all sites are included for instance if everyone else was "sweltering" how did we only see 2010 (12) / 2011 (15) / 2012 (11) such days at KMQS and only 8 such days at Atglen in 2012 - that sure ain't sweltering in my book!!

So I have updated the average number of 90 degree days to include the Philadelphia International Airport and overlaid that analysis over the Chester County data shared yesterday. You can clearly see the impact of the urban heat island (UHI) on the official Philadelphia climate site (the red line is the rapid heat growth). While 90 degrees are declining in Chester County they are rapidly increasing in frequency at the airport. So far in the 2020's PHL is averaging more than 3 weeks of additional 90+ days than here in Chester County. In 1940 when weather observations started at the airport it's footprint was only around 300 acres. Since 1940 the PHL Airport has expanded to over 2,600 acres. That is a staggering 2,078% growth. The significant impact to the official Philadelphia climate data due to this rapid expansion is clearly illustrated below. Especially starting in 1970 when we began to see huge increases in the addition of asphalt, concrete and taxi ways. In 1970 alone the airport added 64% more gates and buildings. Just 2 years later in 1972 runways were expanded to handle 747's. Then 4 new terminals were added in 1977 and parking spaces were increased from 5k to 20k. Rapid increase in asphalt continued in 2002 with an additional 8 miles of pavement added to the site. In 2005 runways were increased and as of today there is now 33,000 feet of asphalt runway at the airport. Next time you see the reporting of 90 degree days on TV.....keep in mind where those figures are coming from - it is not where people live.

So I have updated the average number of 90 degree days to include the Philadelphia International Airport and overlaid that analysis over the Chester County data shared yesterday. You can clearly see the impact of the urban heat island (UHI) on the official Philadelphia climate site (the red line is the rapid heat growth). While 90 degrees are declining in Chester County they are rapidly increasing in frequency at the airport. So far in the 2020's PHL is averaging more than 3 weeks of additional 90+ days than here in Chester County. In 1940 when weather observations started at the airport it's footprint was only around 300 acres. Since 1940 the PHL Airport has expanded to over 2,600 acres. That is a staggering 2,078% growth. The significant impact to the official Philadelphia climate data due to this rapid expansion is clearly illustrated below. Especially starting in 1970 when we began to see huge increases in the addition of asphalt, concrete and taxi ways. In 1970 alone the airport added 64% more gates and buildings. Just 2 years later in 1972 runways were expanded to handle 747's. Then 4 new terminals were added in 1977 and parking spaces were increased from 5k to 20k. Rapid increase in asphalt continued in 2002 with an additional 8 miles of pavement added to the site. In 2005 runways were increased and as of today there is now 33,000 feet of asphalt runway at the airport. Next time you see the reporting of 90 degree days on TV.....keep in mind where those figures are coming from - it is not where people live.

So I have updated the average number of 90 degree days to include the Philadelphia International Airport and overlaid that analysis over the Chester County data shared yesterday. You can clearly see the impact of the urban heat island (UHI) on the official Philadelphia climate site (the red line is the rapid heat growth). While 90 degrees are declining in Chester County they are rapidly increasing in frequency at the airport. So far in the 2020's PHL is averaging more than 3 weeks of additional 90+ days than here in Chester County. In 1940 when weather observations started at the airport it's footprint was only around 300 acres. Since 1940 the PHL Airport has expanded to over 2,600 acres. That is a staggering 2,078% growth. The significant impact to the official Philadelphia climate data due to this rapid expansion is clearly illustrated below. Especially starting in 1970 when we began to see huge increases in the addition of asphalt, concrete and taxi ways. In 1970 alone the airport added 64% more gates and buildings. Just 2 years later in 1972 runways were expanded to handle 747's. Then 4 new terminals were added in 1977 and parking spaces were increased from 5k to 20k. Rapid increase in asphalt continued in 2002 with an additional 8 miles of pavement added to the site. In 2005 runways were increased and as of today there is now 33,000 feet of asphalt runway at the airport. Next time you see the reporting of 90 degree days on TV.....keep in mind where those figures are coming from - it is not where people live.

0.22" of rain this AM from the thunderstorm...briefly lost power. Should see sun returning today and our warmest day for at least the next couple weeks as temps make a run at the 80's today. By contrast on Friday we will struggle to escape the 50's for high temps. Chester County records for today: High 98 degrees at Phoenixville (1930) / Low 29 degrees at both West Chester and Morgantown (1974) / Rain 2.90" Coatesville 2W (1992)

0.22" of rain this AM from the thunderstorm...briefly lost power. Should see sun returning today and our warmest day for at least the next couple weeks as temps make a run at the 80's today. By contrast on Friday we will struggle to escape the 50's for high temps. Chester County records for today: High 98 degrees at Phoenixville (1930) / Low 29 degrees at both West Chester and Morgantown (1974) / Rain 2.90" Coatesville 2W (1992)

Can we say UHI......totally useless numbers these days from PHL

Always a "trick" when the data fails to support alarmist views.....

No bias in basket of stations they are all available NOAA / AWOS and MADIS sites at our disposal

The below will not be received well by climate alarmist on this site. But with the summer season quickly approaching and the fact I now have access to much more station data then in the past. I went back to the complete Chester County PA data set of 26 stations with some having data back to the 1890's. I wanted to see if the number of hot days as defined by 90 degrees is increasing or decreasing here in Chester County?? I separated the stations by their elevation above sea level as we know with increasing elevation there are far less days that surpass 90 degrees. Of the 26 stations in the data the majority (17) stations are sited below 500 ft above sea level (ASL) While only 9 stations are sited at above 500 ft ASL. Going forward with the data here in the 2020's we will still have the majority of stations (11) that are located at lower elevations while 7 of the current stations are in the relatively higher spots. The data which is analyzed by average number of 90 degree days by decade is quite clear that the number of 90 plus days is decreasing at all elevations. In fact the 2020's to date are trending as the 2nd least 90+ days at the lower spots and at the lowest level in the higher spots. Can you imagine back when we really had hot summers like in the 1930's through 1950's how tough it must have been without air conditioning??

With the summer season quickly approaching and the fact I now have access to much more station data then in the past. I went back to the complete Chester County PA data set of 26 stations with some having data back to the 1890's. I wanted to see if the number of hot days as defined by 90 degrees is increasing or decreasing here in Chester County?? I separated the stations by their elevation above sea level as we know with increasing elevation there are far less days that surpass 90 degrees. Of the 26 stations in the data the majority (17) stations are sited below 500 ft above sea level (ASL) While only 9 stations are sited at above 500 ft ASL. Going forward with the data here in the 2020's we will still have the majority of stations (11) that are located at lower elevations while 7 of the current stations are in the relatively higher spots. The data which is analyzed by average number of 90 degree days by decade is quite clear that the number of 90 plus days is decreasing at all elevations. In fact the 2020's to date are trending as the 2nd least 90+ days at the lower spots and at the lowest level in the higher spots. Can you imagine back when we really had hot summers like in the 1930's through 1950's how tough it must have been without air conditioning??