Got to -21F with no problems this last cold spell. When I first ordered the Bloom Sky, they told me that the latest version has an improved battery over what was used earlier. I do recommend the version the solar panel though to keep the battery charged.
There are other problems, such as non-standard reporting of barometer readings (which will likely get sorted out eventually) and a UV index which is not defined to us so far. But it does make UV numbers ...
Several Bloom Sky cameras got through the cold with seemingly no problems. Log into the Bloom Sky website and look at examples across the globe.
It really is a fun instrument to work with.
Here is my station on WU, you can look back through the colder days and see that it worked fine:
http://www.wunderground.com/personal-weather-station/dashboard?ID=KNYWHITE25On the Bloom Sky site: (click on the map to look at other stations, some in Canada):
https://map.bloomsky.com/weather-stations/eaB1rJytnpS4rp6rThere are some reports of problems getting new Bloom Sky units registered on Weather Underground (not a requirement by any means, the BloomSky website and mobile app might be fine alone). I have had good luck with both Bloom Sky technical support and WU support when I ran into registration problems.
I'm having doubts about setting up the Bloomsky station I received for my birthday last month. I read that the station might not do well in the cold and we have been having some major cold here in southern Ontario this winter. What is your opinion?