We are located in the current deep freeze area. For the past 2 mornings I am seeing things not working. Not exactly an HE problem but it affects it.
It appears the worst culprit are a couple of outside cameras going offline. And a couple matter switches which are on outside walls in the same area. It seems that these items not connecting affect the entire wifi network for some reason. Not sure why.
Just kinda wondered if anyone else is seeing cold weather issues.
one wyze camera that was in a window mount offline assume due to cold weather as -26.5f .
not affecting rest of network
Only issue here is with some of my battery powered Ring cameras. The batteries don’t deal well with the cold…
Everything else is working great. But that said, we see these temperatures every year for several days and sometimes weeks up here in the maritimes in Jan/Feb…
Things are still flaky here. Problem seems to rotate around to different devices. Just got through shoveling about 6” snow off driveway in 10 degree. Gonna have to wait until later to mess with it.
AFAIK Matter over Thread mains powered devices can serve as "repeaters" for other Matter over Thread devices. I don't believe Matter over Wi-Fi mains powered devices do the same.
So if your Matter devices are thread, them literally freezing up seems like it could affect other Matter over Thread devices. Not sure how them going offline could affect your Wi-Fi network in general.
Hope everyone is staying warm and safe. For me cameras are good.
I plan to re-add them in my next phase of my re-design when the next hub(s) are released. Right now I have two hubs (Prod-01 and Prod-02). In the next design (depending on hardware model(s) I will have Prod-01, Prod-02 as I do today for application services, Prod-03 for cameras, and Lab-01.
Back to cold weather status. The only issue I have seen is with my one type of motion sensor setup on the perimeter that uses a combination of the Aeotec Water Sensor 7 Pro & the Seco-Larm Enforcer Reflective Motion Sensor. The Water Sensor at some locations are getting wet and causing false trips. I have a RM rule that checks for to many invocations within a certain period of time across to sensors (or at one in some cases) and place the residence in "weather delay" for one hour. Bad placement of the sensors on my part. Will need to revisit this design.
Other than that; as usual, Hubitat is ROCK SOLID thanks to so many of you and your ideas.
Stay warm and safe :-).
My zse44 on the back porch doesn't seem to go below 0F, lol.
Sorry for late response. Spent quite a bit of time yesterday trying to tie down what was offline, etc. It kinda acted like my router was rebooting every night. But I could find no evidence of that.
I have a Deco mesh system with 3 units. Main is in what we call office/study where the modem, HE hub, etc are. Then a satellite unit in the living room and another in the basement kinda underneath the living room.
A couple of the Matter devices, not thread, That were acting up are in the living room. I started tracing the connection and found that they were actually connected to the unit in the basement. I thought that a little strange as the living room unit was a lot closer. Continuing on from there it appeared that most of the devices I ended up having issues with were connected to the basement unit. So for an experiment I powered the basement unit off. Took about an hour but everything came back up and worked fine all day. This morning everything still looks good and it is below zero here. So either the one satellite unit has a problem or it was conflicting with the living room unit.
There are only a couple things that would really benefit from the basement unit but they seem to be fine without it. So will see what happens over the next few days.
Thanks for all the suggestions and help.
Staying warm down here in the southern parts... 
But seriously... if the cold is anything like the heat we can experience, I hope you guys can stay strong.... Neither extreme is nice.
1.2 indoor temp?!! Dude.. your cottage is frozen!! lol
Wow! That humidity is kinda strange tho…
No, I don't think so. Cold air holds less water.
That's relative humidity. At this low temperature, 85% RH translate to a very small amount of water vapeur in the air.
This is what Toyota has to say on that, relative to my new Prius, lol:
(And I've read that it actually is a thing-won't start)
My sensors show absolute humidity. That’s what confused me.
yep winterized and water turned off. I think humidity was high as it was snowing
What brand/model of humidity sensors are you using? All of mine are relative humidity, and thus I am curious what sensors you're using. 
that's the ecowitt wh31 or wh32 temp humidity sensors
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