ChescoWx
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Some spots picked up a little rain last night and overnight. Here in East Nantmeal we picked 0.17" since last evening. Some additional showers are possible this afternoon but our best chances of rain are tomorrow night with the cold frontal passage. Temperatures today will remain below normal in the low to mid-70's. We warm to near normal both Saturday and Sunday before a sharp turn to below normal temps by Labor Day. Many of the lower spots will see low temperatures again in the 40's by Tuesday AM. High Temps for the first week of September will remain in the low to mid 70's. Chester County Records for today: High Temperature 102 degrees at Phoenixville (1953) of note both Coatesville and West Chester also both exceeded 100 degrees to close out the last 2 days of August 1953/ Low Temperature was a chilly 34 degrees at Phoenixville (1986) / Rain 5.04" at Kennett Square (1911)
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Below is a bit of a busy slide but for the first time it shows all 30 NWS stations (color coded if you wish to follow your favorite station) with each stations average annual temperature history plotted individually since 1893 thru 2023. The red trend line shows the overall average of all stations. As we have shown before here in Chester County we have seen nearly flat average temperature trends over the last 130+ years. -
Also I ran an analysis on Sellersville with NWS COOP data since 1949. Through yesterday they have an Average Temp of 72.9 this month. Their long term average of all years since 1949 is 73.5 degrees (0.6 degrees lower than avg.) - but of interest their average August Temp just in the most recent 30 year period is actually lower at 72.7 (only 0.2 degrees above avg.) August's seem to have cooled quite a bit in recent years at Sellersville as you can see in the trend lines since 1949!
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Across all 13 NWS COOP/Airport and MADIS stations across Chester County..and also here in EN - all stations through yesterday are running between no less than 0.5 degrees below normal to as much as 2.7 degrees below normal. Below are the averages this month and the negative departure from normal for August. Atglen 71.6 (1.3) / Chester Springs 71.2 (2.2) / Devault 72.1 (1.7) / Glenmoore 71.6 (1.2) / Kennett Square 71.5 (1.5) / Longwood Gardens 72.2 (1.3) / West Bradford Twp. 71.1 (1.8) / Nottingham 71.0 (2.0) / Warwick Twp 70.3 (2.7) / West Chester 72.0 (2.1) / West Grove 72.4 (1.4) East Nantmeal 71.1 (1.5) / KMQS (Coatesville) 72.4 (0.5) / KOQN (West Chester) 74.1 (2.1) Phoenixville 73.1 (1.8) and Spring City NWS Coop site at 73.4 (1.2)
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Correction RedSky - Phoenixville NWS COOP station is currently at 73.1 degrees thru yesterday their 30 year normal August is 74.9 degrees - which is actually 1.8 degrees BELOW normal for August. Even looking at their 130+ year averages they are running 0.4 degrees below normal. Also -Perkasie is at 72.0 their August Average is 72.8 - so they are also 0.8 degrees below normal this August. To further drive home the clearly below normal month at most locations. Across all 13 NWS COOP/Airport and MADIS stations across Chester County..and also here in EN - all stations through yesterday are running between no less than 0.5 degrees below normal to as much as 2.7 degrees below normal. Below are the averages this month and the negative departure from normal for August. Atglen 71.6 (1.3) / Chester Springs 71.2 (2.2) / Devault 72.1 (1.7) / Glenmoore 71.6 (1.2) / Kennett Square 71.5 (1.5) / Longwood Gardens 72.2 (1.3) / West Bradford Twp. 71.1 (1.8) / Nottingham 71.0 (2.0) / Warwick Twp 70.3 (2.7) / West Chester 72.0 (2.1) / West Grove 72.4 (1.4) East Nantmeal 71.1 (1.5) / KMQS (Coatesville) 72.4 (0.5) / KOQN (West Chester) 74.1 (2.1) and Spring City NWS Coop site at 73.4 (1.2)
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I am superstitious so you know it!! Just can't believe they are running Walker out there again today! Let's hope this is the end!!
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Today will be our last hot day for a while as many spots could touch the 90 degree mark which for some may be the last one of the season. The cold front will cross the region this evening but stall south of the area and creep back north as a warm front over the weekend. Best chance of rain and some could be heavy in any t-storms looks to be late tonight. Temps tomorrow will be sharply cooler with highs in the 70's...a few degrees warmer but not far from normal temps for the weekend before a turn to cooler again by Labor Day and the new work week. Chester County Records for today: High 100 degrees at Phoenixville (1948) / Record Low 38 degrees at Coatesville (1982) / Rain 8.00" at Phoenixville (2011)
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Today will be our last hot day for a while as many spots could touch the 90 degree mark which for some may be the last one of the season. The cold front will cross the region this evening but stall south of the area and creep back north as a warm front over the weekend. Best chance of rain and some could be heavy in any t-storms looks to be late tonight. Temps tomorrow will be sharply cooler with highs in the 70's...a few degrees warmer but not far from normal temps for the weekend before a turn to cooler again by Labor Day and the new work week. Chester County Records for today: High 100 degrees at Phoenixville (1948) / Record Low 38 degrees at Coatesville (1982) / Rain 8.00" at Phoenixville (2011)
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UHI FTW....look outside of the heat island for reality
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A brief warm up underway across the area today. Mid 80's today with many spots reaching the 90's tomorrow. But a quick cool down as Thursday and Friday have temps back below normal in the 70's for high temps. Small chances of showers with the front Wednesday night thru Thursday. Chester County Daily Records for Today: High 100 degrees at Phoenixville (1948) / Low 42 degrees also at Phoenixville (1944) / Rain 6.94" at Glenmoore (2011) from the remnants of Hurricane Irene that impacted the area.
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A brief warm up underway across the area today. Mid 80's today with many spots reaching the 90's tomorrow. But a quick cool down as Thursday and Friday have temps back below normal in the 70's for high temps. Small chances of showers with the front Wednesday night thru Thursday. Chester County Daily Records for Today: High 100 degrees at Phoenixville (1948) / Low 42 degrees also at Phoenixville (1944) / Rain 6.94" at Glenmoore (2011) from the remnants of Hurricane Irene that impacted the area.
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Wunderground does not QC those readings. Lots of folks on that site have poor siting issues or heat shield problems. The Highs on Sunday across Chester County were mostly in low 80's in higher county spots - Some NWS MADIS station reports from Sunday included West Grove 80.2/ Atglen 80.9/ Glenmoore 82.3 / Kennett Square 82.2 and KMQS Airport 82.2
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Yesterday made it 17 of the last 19 days with below normal temperatures for August. We turn that around starting today through Wednesday before we fall back below normal to close out the month next weekend. Slight rain chances Wednesday night through Thursday. Chester County Records for today: High 100 degrees at Phoenixville (1948) / Low 40 degrees also at Phoenixville (1944) / Rain 2.91" at Coatesville 1SW (1908)
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Yesterday made it 17 of the last 19 days with below normal temperatures for August. We turn that around starting today through Wednesday before we fall back below normal to close out the month next weekend. Slight rain chances Wednesday night through Thursday. Chester County Records for today: High 100 degrees at Phoenixville (1948) / Low 40 degrees also at Phoenixville (1944) / Rain 2.91" at Coatesville 1SW (1908)
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It appears that August will finish as the first below normal temperature month of the year (current estimate is 0.6 degrees below normal) and our first since last November when we were 1.2 degrees colder than normal. However, we do have an above normal temperature final week of August on the way with the warmest day being Wednesday when some spots may reach the 90's. If this happens this could well be the final 90 plus day of the year for some locations. Only a slight chance of a shower Monday evening otherwise continued dry. Chester County Records for today: High 101 degrees at Phoenixville (1943) / Low 40 degrees at Coatesvile 1SW (1927) / Rain 3.29" at West Chester (1905)
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It appears that August will finish as the first below normal temperature month of the year (current estimate is 0.6 degrees below normal) and our first since last November when we were 1.2 degrees colder than normal. However, we do have an above normal temperature final week of August on the way with the warmest day being Wednesday when some spots may reach the 90's. If this happens this could well be the final 90 plus day of the year for some locations. Only a slight chance of a shower Monday evening otherwise continued dry. Chester County Records for today: High 101 degrees at Phoenixville (1943) / Low 40 degrees at Coatesvile 1SW (1927) / Rain 3.29" at West Chester (1905)
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Updated Chester County Average Temperatures by Decade 1890's thru 2020's (only 4 years) IF we don't start to see some cooling over the remainder of the decade we have a chance that the 2020's could be the warmest complete decade since reliable climate data began to be recorded in the 1890's. So far in the 2020's we are running 0.6 degrees warmer than our warmest full decade - the 1930's.
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Updated Chester County Average Temperatures by Decade 1890's thru 2020's (only 4 years) IF we don't start to see some cooling over the remainder of the decade we have a chance that the 2020's could be the warmest complete decade since reliable climate data began to be recorded in the 1890's. So far in the 2020's we are running 0.6 degrees warmer than our warmest full decade - the 1930's.
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I have updated the climate data base for Chester County to add additional stations. See the total list below. These include some that record all weather types (temperature, rain and snow), some just rain and snow and a few just rainfall amounts. This brings the total current and historical network up to 34 NWS COOP/MADIS/AWOS stations to 34. You will note I have included the mapping coordinates. The approximate midpoint latitude in the County is at 39.8 degrees - we have 18 stations north of there and 16 stations in Southern Chester County
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56.4 for the overnight low. Our stretch of great weather looks to continue with a slow warming trend. In fact for some of the lower elevation spots by Wednesday we could touch 90 degrees. But any heat looks short lived as we fall back to more normal temperature levels to close out the new work week. Our only slight chance of rain looks to be Monday evening. Chester County Records for today: High 101 degrees at Phoenixville (1943) / Low 41 degrees also at Phoenixville (1973) / Rain 3.78" at West Grove (1933) from the remnants of The Chesapeake–Potomac hurricane.
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56.4 for the overnight low. Our stretch of great weather looks to continue with a slow warming trend. In fact for some of the lower elevation spots by Wednesday we could touch 90 degrees. But any heat looks short lived as we fall back to more normal temperature levels to close out the new work week. Our only slight chance of rain looks to be Monday evening. Chester County Records for today: High 101 degrees at Phoenixville (1943) / Low 41 degrees also at Phoenixville (1973) / Rain 3.78" at West Grove (1933) from the remnants of The Chesapeake–Potomac hurricane.
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14 of our last 16 days have featured below normal temperatures. Temps today will still be a little below normal (low 80's) levels. Tomorrow we warm to near normal and then above normal readings starting on Sunday. Our next chance of rain looks to be later Monday. Chester County Records for today: High 100 degrees at Phoenixville (1936) / Low 41 degrees at Coatesville 1SW (1952) / Rain 4.74" at Phoenixville (1933)
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14 of our last 16 days have featured below normal temperatures. Temps today will still be a little below normal (low 80's) levels. Tomorrow we warm to near normal and then above normal readings starting on Sunday. Our next chance of rain looks to be later Monday. Chester County Records for today: High 100 degrees at Phoenixville (1936) / Low 41 degrees at Coatesville 1SW (1952) / Rain 4.74" at Phoenixville (1933)
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Mr Mann and colleagues may want to focus on a new line of work.....they will need a near historic rest of the season to even approach this forecast. is this the worst forecast ever? Makes us feel real comfy on all of these climate forecasts we hear from alarmists like Mr. Mann!
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This morning was the coldest August morning here in East Nantmeal in over 10 years with our morning low of 51.7. This was the coldest reading since the 51.5 on August 15, 2014. Quite a few of the lower elevation spots reached the 40's with the lowest being the 45.8 at Warwick Township. We should see the higher spots again remaining in the unseasonably chilly 60's for highs today before we start a warming trend tomorrow through the weekend. Chester County Records for today: High 102 degrees at Sadsburyville (1916) / Low 41 degrees at Phoenixville (1949) / Rain 2.73" at West Grove (1933)
