Did everyone else know this but me? Weather temperatures

[Lottle]

I just found out that the temperatures given in the weather forecast are the temperatures in the shade!

No wonder I was constantly overdressed and boggled that "oh this is warm for 19 degrees".

What else don't I know?!

What I'd like to know, is why (on the bbc weather app) does the picture sometimes show rain at quite a low % chance, but not when it's a higher %.

Is it because, while at 17:00, there's a higher chance of rain, it won't rain for as long/be as heavy?
So the picture is saying "there's only a 10% chance of rain at 16:00, but if it happens, you'll know about it, whereas the rain at 17:00 is more likely but will be less actual rain"?
At 18:00 on that day, the picture is full sun, but a 35% chance of rain. I need answers!

I'm a bit obsessive about the weather, but I don't have any excuse! My American friend says it's the UK's nation obsession.

national obsession

Google Stevenson screen OP. We learned this in school aged about 12.

Stevenson screen, anemometer, rain gauge.

Cut and paste but explains better than I can.

The probability of precipitation is predetermined and arrived at by the forecaster by multiplying two factors: Forecaster certainty that precipitation will form or move into the area X Areal coverage of precipitation that is expected

Using this, here are two examples giving the same statistical result:

(1) If the forecaster was 80% certain that rain would develop but only expected to cover 50% of the forecast area, then the forecast would read "a 40% chance of rain" for any given location.

(2) If the forecaster expected a widespread area of precipitation with 100% coverage to approach, but he/she was only 40% certain that it would reach the forecast area, this would, as well, result in a "40% chance of rain" at any given location in the forecast area.

Does that make sense?

I always wondered what that white box was!

Thomas Stevenson, the father of author Robert Louis Stevenson. Not the railway engine bloke (George Stephenson with a ph).

They do look a bit like beehives @VelvetUndergrounds

We were taught weather as in how rain is created, types of clouds etc we didn't do anything about forecasting weather. I had geography upto age 14, I took history for GCSE instead, we couldn't do both.

@RightWhereYouLeftMe yes! And it will say 18 degrees yet every hour individually is 17 or less!

I heard this recently but for me it's the same thing!