ChescoWx

October Climate Summary - Chester County Area. See details and overall rankings since 1890 below. We were slightly warmer than normal +0.8 and about average regarding precipitation. Through the 1st 10 months of the year we are running at 0.5 degrees below normal temperatures.

October Climate Summary - Chester County Area. See details and overall rankings since 1890 below. We were slightly warmer than normal +0.8 and about average regarding precipitation. Through the 1st 10 months of the year we are running at 0.5 degrees below normal temperatures.

oday back in 1950 Phoenixville 1E hit 86 degrees and the county as a whole averaged 84.7 for a high...this followed the warmest Halloween ever recorded across the entire USA. That date here in Chester County was the warmest November 1st since records began in 1890. Today we should see highs from near 60 degrees in ridge locations to the low 60's in valley spots with lows tonight in the mid 30's to low 40's. Our warmest day this week will be Wednesday with highs not far from 70 degrees! We turn progressively chillier starting Thursday and by next Sunday morning we should see lows in the mid 30's to low 40's, not far from freezing in the colder valleys! It has been a while since our last rain but our next soaking rain looks to arrive Thursday into Friday with around 1.8" possible according to our ChescoWx model.

Today back in 1950 Phoenixville 1E hit 86 degrees and the county as a whole averaged 84.7 for a high...this followed the warmest Halloween ever recorded across the entire USA. That date here in Chester County was the warmest November 1st since records began in 1890. Today we should see highs from near 60 degrees in ridge locations to the low 60's in valley spots with lows tonight in the mid 30's to low 40's. Our warmest day this week will be Wednesday with highs not far from 70 degrees! We turn progressively chillier starting Thursday and by next Sunday morning we should see lows in the mid 30's to low 40's, not far from freezing in the colder valleys! It has been a while since our last rain but our next soaking rain looks to arrive Thursday into Friday with around 1.8" possible according to our ChescoWx model.

Both Delaware https://chescowx.com/raw-vs-ncei-delaware/ and New York State https://chescowx.com/raw-vs-ncei-new-york/ are now up and availabe with raw vs anomaly vs NCEI figures charts and trends.

I was asked to compare PHL Airport vs East Nantmeal Twp. In the western philly burbs of Chester County PA for climate since 2004. (see full panel below) Summer afternoons: PHL’s highs run 5.4–6.3°F warmer from June through September. Against the whole county the gap was mainly at night; against East Nantmeal it’s mainly in the daytime. That fits what the siting check found: my fan-aspirated Davis VP2 records cooler highs. Elevation adds to it. Overnight lows: PHL is warmer every month, from 2.8°F in April to 5.1°F in August. Rain and snow: Precipitation: East Nantmeal gets 50.35" a year to PHL’s 45.56". It’s wetter in most months, especially July (5.62" vs 4.66"). Snow: East Nantmeal averages 35.8" a season against 22.7" at PHL, about 58% more. EN had more snow than PHL in all 22 seasons. February shows the biggest difference: 13.4" vs 8.4". Is the temperature gap widening? Yes. It has grown about 0.46°F per decade, mostly in daytime highs (+0.64). PHL warmed about 1.0°F per decade over these 22 years, against 0.55 at East Nantmeal. I will post up Chester County as a whole later. Let me know if any questions. Thanks!

I was asked to compare PHL Airport vs East Nantmeal Twp. In the western philly burbs of Chester County PA for climate since 2004. (see full panel below) Summer afternoons: PHL’s highs run 5.4–6.3°F warmer from June through September. Against the whole county the gap was mainly at night; against East Nantmeal it’s mainly in the daytime. That fits what the siting check found: my fan-aspirated Davis records cool highs. Elevation adds to it. Overnight lows: PHL is warmer every month, from 2.8°F in April to 5.1°F in August. Rain and snow: Precipitation: East Nantmeal gets 50.35" a year to PHL’s 45.56". It’s wetter in most months, especially July (5.62" vs 4.66"). Snow: East Nantmeal averages 35.8" a season against 22.7" at PHL, about 58% more. EN had more snow than PHL in all 22 seasons. February shows the biggest difference: 13.4" vs 8.4". Is the temperature gap widening? Yes. It has grown about 0.46°F per decade, mostly in daytime highs (+0.64). PHL warmed about 1.0°F per decade over these 22 years, against 0.55 at East Nantmeal. I will post up Chester County as a whole later. Let me know if any questions. Thanks!

I was asked to compare PHL Airport vs East Nantmeal Twp. In the western philly burbs of Chester County PA for climate since 2004. (see full panel below) Summer afternoons: PHL’s highs run 5.4–6.3°F warmer from June through September. Against the whole county the gap was mainly at night; against East Nantmeal it’s mainly in the daytime. That fits what the siting check found: my fan-aspirated Davis VP2 records cooler highs. Elevation adds to it. Overnight lows: PHL is warmer every month, from 2.8°F in April to 5.1°F in August. Rain and snow: Precipitation: East Nantmeal gets 50.35" a year to PHL’s 45.56". It’s wetter in most months, especially July (5.62" vs 4.66"). Snow: East Nantmeal averages 35.8" a season against 22.7" at PHL, about 58% more. EN had more snow than PHL in all 22 seasons. February shows the biggest difference: 13.4" vs 8.4". Is the temperature gap widening? Yes. It has grown about 0.46°F per decade, mostly in daytime highs (+0.64). PHL warmed about 1.0°F per decade over these 22 years, against 0.55 at East Nantmeal. I will post up Chester County as a whole later. Let me know if any questions. Thanks!

So far this year through yesterday.

So far this year through yesterday.

Happy Halloween to all of you!! Today we should see highs from upper 50's in ridge locations to the low 60's in valley spots. The NWS has issued a frost advisory for tonight for Eastern Chester County with temperatures just above freezing in valley locations while the ridge tops mainly across Western Chesco stay in the low 40’s. Temperatures will be near normal through Monday but by Tuesday we warm to the upper 60's which is 4 to 8 degrees above normal. It has been a while since our last rain but our next soaking rain looks to arrive Friday with around 1.6" possible according to the ChescoWx model. Of note 160 years ago today back in 1866 the Chester County Area was on the last day of a 3 day storm that left as much as 2.10" of rain at Pocopson. This was the remnants of an unnamed tropical storm which tracked within about 130 miles of the county.

Happy Halloween to all of you!! Today we should see highs from upper 50's in ridge locations to the low 60's in valley spots. The NWS has issued a frost advisory for tonight for Eastern Chester County with temperatures just above freezing in valley locations while the ridge tops mainly across Western Chesco stay in the low 40’s. Temperatures will be near normal through Monday but by Tuesday we warm to the upper 60's which is 4 to 8 degrees above normal. It has been a while since our last rain but our next soaking rain looks to arrive Friday with around 1.6" possible according to the ChescoWx model. Of note 160 years ago today back in 1866 the Chester County Area was on the last day of a 3 day storm that left as much as 2.10" of rain at Pocopson. This was the remnants of an unnamed tropical storm which tracked within about 130 miles of the county.

Of note on this date back in 1946 Phoenixville 1E hit 85 degrees and the county as a whole averaged 83.3 for a high...making it our warmest October 30th since records began in 1890. Nothing like that today but it will be very mild for the end of October with highs from upper 60's in ridge locations to the low 70's in valley spots. This is about 7 degrees above normal with lows tonight in the upper 30's to near 40. By Sunday morning we should see lows in the mid 30's to low 40's, not far from freezing in the colder valleys! Temperatures will be near normal this weekend but by Monday we warm to the upper 60's which is 3 to 8 degrees above normal. It has been a while since our last rain but our next soaking rain looks to arrive Thursday with around 1.2" possible according to the ChescoWx model.

Of note on this date back in 1946 Phoenixville 1E hit 85 degrees and the county as a whole averaged 83.3 for a high...making it our warmest October 30th since records began in 1890. Nothing like that today but it will be very mild for the end of October with highs from upper 60's in ridge locations to the low 70's in valley spots. This is about 7 degrees above normal with lows tonight in the upper 30's to near 40. By Sunday morning we should see lows in the mid 30's to low 40's, not far from freezing in the colder valleys! Temperatures will be near normal this weekend but by Monday we warm to the upper 60's which is 3 to 8 degrees above normal. It has been a while since our last rain but our next soaking rain looks to arrive Thursday with around 1.2" possible according to the ChescoWx model.

"needs" to be "corrected" with estimated homogenization adjustments