As stated in the Noise Guidebook, âSTC is used as a. measure of a material's ability to reduce sound,â and. effectively mitigate any adverse noise levels that. could impede a person's use of a residential or. commercial structure. The higher the STC value, the. greater the sound attenuation and presumably the.
1 Record Coldest year in Pennsylvania - 1917 / Avg temperature 46.08 degrees. 2  Pennsylvania average Summer temperature (June, July, August) 68.6 F degrees, 34th warmest U.S. summer state. Pennsylvania average Summer temperature (June, July, August) 68.6 F degrees, 34th warmest U.S. summer state. 2  Pennsylvania average Winter temperature (December, January, February) 28.4 F degrees, 20th coldest U.S. winter state.
Weather at Mount Rushmore can be highly variable in any season. Summer high temperatures range from 70 100 degrees Fahrenheit. Fall high temperatures range from 45 to 80 degrees Fahrenheit. Winter high temperatures range from 20 to 40 degrees Fahrenheit. Spring high temperatures range from 30 to 70 degrees Fahrenheit.