Humidity at night

[brasill2424]

I bought my first tent a 5x 5 spider farmer I have a total of 9 plants 3 autos 5 photos I'm struggling with the humidity at night temp is around 67 to 75 degrees but humidity at night is 85 plus some nights but the humidity in the day is around 65 to 70 with the light on I'm not pumping air out cause I want them to have fresh air so I'm pumping air in idc about the smell I have one flap open on the bottom and 1 duct open for vents what should I do I do plants look healthy no signs of stress at all I know the humidity at night is hurting me right?? What should I do

 

[BB22]

Pics would help

 

[amneziaHaze]

Nothing much you can do.faster fan if outside the tent is low humidity.dehumidifier or air conditioner.or lower leaf mass soo less stuff evaporates.
And maybe make your tents night time to be middle of the day.

 

[LoveGrowingIt]

I know the humidity at night is hurting me right??

Humidity increases as the air temperature decreases, so it's normal for humidity to increase at night.

The humidity is high, but it's good that the plants aren't complaining. How often are you watering? How much water do you give them?

I'm not pumping air out cause I want them to have fresh air so I'm pumping air in

I'm not sure it matters about fresh air. I have my fans pull air from the top to pull out hot air from the light.

 

[Grownsince95]

You said your night temps are between 67° and 75°.

85% humidity at 67° goes down to 68% at 75°

Same exact amount of moisture in the air but because the air is warmer it's not as saturated.

I would try to keep it closer to 75° at night. Run the days at 82° and the humidity will go down to 53%

It's all relative

 

[LoveGrowingIt]

It's all relative

That could be why they call it relative humidity.

I just remembered that the atmosphere holds 7% more moisture for every degree Celsius temperature increase, according to the laws of thermodynamics. I recall this from reading about climate change science. So, because the atmospheric temperature has increased about 1.5º C, so far, the atmospheric moisture has increased about 10%. Of course, that 1.5º C is a planetary average, so local conditions will vary. I interpret it as likely causing rainy climates to be even more rainy and cloudy--like where I live. Unfortunately, atmospheric water vapor is also a greenhouse gas and thus the increase further warms the planet.

Steamy Relationships: How Atmospheric Water Vapor Amplifies Earth's Greenhouse Effect - NASA Science

Water vapor is Earth’s most abundant greenhouse gas. It’s responsible for about half of Earth’s greenhouse effect — the process that occurs when gases in

science.nasa.gov

 

[Grownsince95]

That could be why they call it relative humidity.

I was hoping someone would catch what I was trying do do there!!

 

[UK25]

Hi
Same here.

I cant drop humidity at night below 70%
Day time it's arround 64% however at night it rise to 73%.
Tent size 70x140x200 spoder farmer .
Exhaust fan 4" blowing air outside of the house.
4 plants in week 4 flowering. Blue cheese feminised.
1 circulation fan 6" spider farmer .
AlBoth of them connected to GGS controller from spider farmer.
I do water each plant 1 -1.5 l of water every 3 days when lights go on .
I put small dehumidifire in , but it doesn't collects much water .
Please look on parameter and myvtent set up please .
Any advice would be helpful.

 

[Grownsince95]

Raise your temp both day and night. Go 29° lights on and 25° at night. I battle the same problem and if you can't win against the humidity it's easy to add heat and the plants are just fine.

The goldilocks zone is great when you can get it but my plants like their porridge hot!