Hiya, thanks for your question! There's no temperature rating for this boot, however, I can tell you that this boot isn't insulated, so it's not meant to be worn outside for long periods of time. I wouldn't recommend it for temperatures below 20 degrees Fahrenheit, or -6 centigrade. In fact, it is best to not wear it outside for more than 30 minutes at 20 degrees Fahrenheit. Warm socks could make it more insulated in the cold, but I would try a different boot.
The Merrell Women's Eventyr Cuff Waterproof Boot is another version with 200 grams of insulation. It will be warmer than the Peak boot, but not recommended for very cold weather.
You can find it here: http://www.moosejaw.com/moosejaw/shop/product_Merrell-Women-s-Eventyr-Cuff-Waterproof-Boot_10287372_10208_10000001_-1_
You could also try the Merrell Women's Polarand Rove Peak Waterproof Boot.
Looky here: http://www.moosejaw.com/moosejaw/shop/product_Merrell-Women-s-Polarand-Rove-Peak-Waterproof-Boot_10256086_10208_10000001_-1_
If you want something suited to extremely cold temperatures, you might have to try a hunting boot, like the Under Armour Women's UA Haw 2.0 800G Boot. It has 800 grams of insulation.
Here ya go: http://www.moosejaw.com/moosejaw/shop/product_Under-Armour-Women-s-UA-Haw-2-0-800G-Boot_10323676_10208_10000001_-1_
Hope this helps!
Date published: 2016-09-15