Each bean contains 0.8 - 2.5 % caffeine. For your information in an average cup of coffee you have 75mg caffeine. One cup of coffee contains around 25 coffee beans, and you are not getting the full coffee bean in coffee, so the caffeine can add up if you eat a lot.
The reason why temperature effects muscles is because of the numerous atoms in the body that react to temperature. When the air, or body temperature is colder the atoms tend to stay closer together, causing less movement...when it is hot, the atoms (molecules) move around more, causing more range of motion. It also allows blood to flow more easily when it is warm than cold.
Cold temperatures demand that your heart rate increases. Temperatures below 40 degrees hasten the loss of body heat. Shivering is a well-known response, but a less obvious reaction is heart rate increase. In cold weather, a faster heartbeat benefits muscular and respiratory function but in an unfit individual can also increase the risk of heart failure, according to Peak Performance.