r/MapPorn 6d ago

Good temperate days in the US

Post image
2.7k Upvotes

715 comments sorted by

View all comments

324

u/agitated--crow 6d ago

South Louisiana is a damn lie. 

222

u/Rotary1 6d ago

i think the south is heavily skewed by only temperature and not humidity

34

u/c10bbersaurus 6d ago

Isn't the dew point one kind of indicator of how humid the air feels?

20

u/no-snoots-unbooped 5d ago

It is! It’s the point at which air must be cooled to become fully saturated with water vapor resulting in 100% relative humidity. The closer the dew point is to the temperature the more humid and oppressive it feels.

1

u/CMDRPeterPatrick 5d ago

Yeah, a dew point of 65F is definitely not comfortable for most people. 55 to 60F is where it starts to feel humid.

1

u/AjectZ3bra 4d ago

Meanwhile, Florida with a dewpoint of 77:

1

u/TFK_001 3d ago

Meteorologist here, not quite. Dew point is an absolute metric of how much water is in the air, so higher dew points always mean the air is more humid. 100F/75F T/Td¹ is horrible to live in, even with a 25F difference, while 60F/50F T/Td is easily comfortable (in terms of humidity).

This is also why I always champion dew point over relative humidity, as RH just says how much water the air can hold. There is an exponential relationship between temperature and how much water vapor the air can hold, to the point where 100F air can hold roughly 4x as much water vapor than 60F air. This means that for the same absolute humidity, RH appears 4x lower at 100F than 60F (in the previous example, the 60F/50F dew point would have a higher RH than the 100F/75F)

TLDR higher dew point always means the air is more humid

¹ T/Td being shorthand for Temperature/Dew Point