What the numbers mean for an outdoor sauna project
Birmingham has a mild climate load. Its Climate Stress Score of 21.1 is below the indexed-metro median of 37.9. The January normal low is 34.9°F, and 0 months have a normal low below freezing.
The primary planning issue in this profile is rain and exterior moisture management. The standardized 9 kW session estimate is $2.41, below the indexed-metro median of $2.46; this uses the Alabama statewide residential electricity average, not a city utility quote. The selected snowfall record reports 1.4 inches annually.
For construction or maintenance work that is easier in moderate conditions, the monthly normals point to February, March, April, May. This is a climate-screening observation, not a construction schedule or permit recommendation.
Comparison context