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.
Pennsylvania Weather > Duncannon Weather Duncannon, PA Weather Duncannon, PA climate is warm during summer when temperatures tend to be in the 70's and very cold during winter when temperatures tend to be in the 20's. The warmest month of the year is July with an average maximum temperature of 84.60 degrees Fahrenheit, while the coldest month of the year is January with an average minimum temperature of 19.40 degrees Fahrenheit.