Temperature vs. Humidity Guide*

Outside

Temperature

Recommended Indoor
Humidity Limit

20 to 40 F

40 percent

10 to 20 F

35 percent

0 to 10 F

30 percent

-10 to 0 F

25 percent

-20 to -10 F

20 percent

Below -20 F

15 percent

* Based on a double-glazed window and an indoor temperature of 70 degrees.