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My climate is similar to London during summer, and clouds like those in Philadelphia are common.
Hilly terrain/ heavy vegetation causes rapid heating, and convective formation starts quite early in the day. The convective process generally stalls between cumulonimbus and anvil formation, but they will still usually result in localised showers
It's more common from about October until early summer (causing December to be the cloudiest month), then lessen through Jan and Feb, before increasing again from about early march as cyclone and subtropical lows increase.
Those Friday clouds would be rare here too. Temp was 24c that day. SWly usually brings low/mid 20s and cumulus.
Your photos didn't look like cumulonimbus, they looked like cumulus congestus (cumulus are by far the most common cloud type in summer).
It seems like you are looking for an argument where there isn't one. Don't you remember the towering cumulonimbus with flat tops that we had last spring, when temps were only 15-20c. I think nei commented that they looked like summer clouds.
This mini weather station is so cool I love it. Cost me $100 and well worth it. It is a very mobile station as you can walk around with it. I have it on a string so it is no where near my body heat.
You get a read out as shown below. Very steamy as I walked to work and the readings come right up on your phone screen. Uses blue tooth to sync with your phone. Also records and stores day and days worth of data you can download.
This screen is another option and reflects conditions in my hot office this morning.
It can do Celcius easily as you can change the settings to C or F.
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