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.
Mount Rushmore is 5,680 feet above sea level, which means snow in winter and cool nights in summer. The winter months can bring temperatures of 40ÂºF and 10-20 degrees cooler in the evening. The weather starts to warm up during the spring. Expect spring temperatures in the between 50-60ÂºF. The average temperature during the summer months is 70-80ÂºF. May and June are typically the two wettest months of the year. In late May and early June fog can obscure the view of Mount Rushmore for part of the day.