No doubt something is jamming the signal.
A cheap walwart switching power supply? Try unplugging all such devices in your house. If it works, plug them back in one at a time to isolate the offender. It could also be something at a neighbour’s house.
+1
Unplug everything that has a plug attached to it. Consider even the freezer and the fridge.
And by everything I mean: do a room-to-room sweep. If you must; flip the main-switch.
Have you installed new gadgets in the meantime? Maybe a powerplug for your internet? Charger?
A ventilator over your head? Airco, boiler, central heating pump. Things you normally “don’t notice”.
BTW household appliances (hoover) are notorious for causing ripples in the net when starting up.
Some things even apply to your neighbours, if they are connected to the same fase on the grid as you.
IF you’re on a 3-fase connection to the grid, try to feed your wifi stuff from an other fase.
maybe the base station has changed its channel
did it power cycle or change batteries?
i have also had them change for no reason
It’s the CIA. No doubt. 
Have you had a cold snap or any sudden change of weather come thru recently, such as the night before they quit working? Are all of the outdoor sensors battery powered?
Alexa, please jam the neighbors annoying weather stations. They’re interfering with my new wireless toilet flusher
Do you know time wise and date when it happened this time?
Satan,
Putin,
Or Dick Cheney
I blame Pfizer.
Don’t be redundant.
Why Santa :smiling_imp:
Sometimes I seem to be a bit dyslexic. Like when I read yes, and she meant no.
It could be aliens. Maybe Jeff Goldblum can help.
For real, I’d suspect interference, or a dead receiver. “Reboot” them all by puling the power sources and see if it helps.
when our wireless stations sporadically stopped showing sensor signals,
we relocated the sensors/station. that worked until it did not.
(we have only two: LaCrosse and Oregon Scientific)
we reset everything and they worked until they quit.
bottom line: insects were getting inside the sensors.
apparently, some insects LIKE electricity.
“There are a variety of insects that have an affinity for electrical hardware…”
https://www.google.com/search?q=wellstone+radio+jamming&tbs=li:1
https://www.google.com/search?q=air+force+radio+signal+garage+door+openers
Ya never know, the electronic smog is getting thick out there.
Thanks for all of the suggestions.
During the day today they all started picking up their signals again. Not all at once but over 12 hours or so.
I live in a rural area and no neighbors are too close. The hardware and batteries all look visually OK - no cracks, corrosion, bugs or water. Nothing new in the house. I have shut off individual breakers in the house but never all at once which is what I will try if this happens again.
This event started on Oct. 5 in the early AM EDT probably around 3:00 AM give or take an hour.
The event last year was on Sunday June 2 but I don't know the time. Here is a link that a friend sent me at the time that seemed like it could have been connected to.
https://www.zerohedge.com/news/2019-06-02/did-government-just-test-internet-kill-switch
I know nothing about the site but it was interesting to see what supposedly happened at the same time.
I don't know the MHz but will check into it.
One or two or even three having problems at once might happen but five unrelated ones at the same time points to something other than the weather stations themselves. It just tough finding it.
Again, thanks for the ideas.
They are 433 MHz. I do have another one that is 900MHz that is working and has always worked great.
I had one stop and start working again back this spring around June.
Ooh, like the dreaded Rasberry ants…
Cheyenne Mountain, eh?
I don’t think it’s coincidence that opening the iris on the chappa’ai was done with a GDO (garage-door opener)…
Spiders are the constant enemies of accurate rainfall reports of my wireless stations.
Wife constantly belittles me with her mason jar totals.