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E PA/NJ/DE Autumn 2025 Obs/Discussion


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Happy Halloween! There is a wind advisory in effect till midnight tonight and it will be a bit chillier than normal with temperatures falling into the mid to upper 40's and breezy. So, make sure to dress those trick or treaters accordingly if heading out for some treats. Temperatures for the next week will average close to or a little below normal for the first week of November. That said, while most of our valley spots have had several freezes, here on the higher ridge locales we have still not seen a frost or freeze, and this looks to continue for at least the next week. Our next rain chances look to be possible by Wednesday night.

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A beautiful autumnal weekend on the way! Leaves may be a bit past peak but enjoy. It’s still breezy today but not as windy as yesterday. Temperatures are not too far from normal to start November. We stay near normal early this week before trending back to below normal temperatures by the end of the week. We could see freezing temperatures again by tomorrow morning in those spots who have already seen multiple below freezing readings. Higher ridge locations have still not seen either a frost or freeze this autumn season. Only some slight rain chances on Monday evening but otherwise a dry week ahead.

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On 10/31/2025 at 4:23 PM, Albedoman said:

noon runs look like an overrunning situation  possibly forming after a cold frontal passage near 11/13 with cold enuf temps to have  frozen precip. Something to watch. The cold frontal passage  on the 10th will bring hard freezes with temps in low 20's and high in the upper 30's. 

now it is showing up on tonights run. First flakes of the year?

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3 hours ago, LVblizzard said:

Looks like most models have something off the coast early next week. The GFS is the only one that gets it cold enough for accumulating snow. At the very least it’s nice to have something to track again.

I just like to see some flurries floating through the air to get the party started...

61F already starting to get dark, 452 p.m.

 

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My first shot at this potential event-- the coastal timing will bounce back and forth on the 10th to 11th. I only expect a white rain event at the best. Just not cold enough to see accumulating snow this time of the year in the valleys.  The cold air  has  not been really locked in yet. Strictly an elevation event if it does occur--about 1500ft  for accumulating snow.   South Mtn range is my best guess at this time to see the best chance of accumulating snow in our area.  The big takeaway IMHO- it will finally feel like winter again, with highs in the mid to upper 30's and the heat will finally have come on. The GEM  sees something on the noon run but the snow hits at the very tail end of the storm. The GFS will be bouncing all over the place the next 5-7 days  typical with the govt shutdown for additional air soundings in the Pac west

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regardless of snow, looks like a decent cold shot across all guidance around the 10-12th. 

 

A bit OT but i started reading this last night to get into the winter spirit: https://www.goodreads.com/book/show/61272028-northeaster

 

highly recommend it for any other weather history buffs out there. It's an enjoyable read so far about a storm I really knew nothing about.

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Sun is returning this afternoon with highs near normal in the upper 50's. Similar weather tomorrow before our warmest day of the week on Wednesday with temperatures into the low to mid 60's for some great Indian Summer type weather. We turn much cooler again on Thursday with highs struggling into the low 50's for most spots. Our next rain chance looks to arrive by Friday night.

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Here in Chester County PA October finished as our 5th below normal temperature month over the 1st 10 months of 2025, It was the 59th coldest October over the last 133 years of county climate records. Precipitation wise it was the 53rd driest October but much wetter than last October which was our driest October on record with many spots not recording any measurable rainfall at all. This October continues our trend of slightly cooling Octobers with climate records back to 1893. Below is the October average temperature trend lines and the overall Climate Summary Detail for October 2025.image.thumb.jpeg.2310f5253cd84a0346f88f8a60b713ea.jpegimage.thumb.png.e18f488853dd47fb4dbf8be78d557a28.png

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Yesterday I bottomed out at 37, the coldest since April 12 IMBY, with a high of 61.  This morning's low was a bit warmer at 42 and I made it up to 58 for a high after the cloud deck broke up.  Didn't get any of the precip that had been moving north this morning, but exited to the northeast before it got all the way here.

Currently 52 with dp 48.

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