Lymph in the lymph vessels eventually reaches a lymph node -- there are about 100 nodes scattered throughout the body. Lymph nodes filter the lymph and also contain large numbers of white blood cells (a big part of the immune system), which remove foreign cells and debris from the lymph.When you get certain infections, the lymph nodes swell with billions of white blood cells working to clear the foreign cells causing the infection.ymph nodes filter the lymph and also contain large numbers of white blood cells (a big part of the immune system), which remove foreign cells and debris from the lymph. When you get certain infections, the lymph nodes swell with billions of white blood cells working to clear the foreign cells causing the infection.
Yellowstone: Annual Weather Averages. July is the hottest month in Yellowstone with an average temperature of 24Â°C (75Â°F) and the coldest is January at -2Â°C (28Â°F) .ellowstone: Annual Weather Averages. July is the hottest month in Yellowstone with an average temperature of 24Â°C (75Â°F) and the coldest is January at -2Â°C (28Â°F) .
Pack clothing for both warm and cool weather, as temperature changes can be extreme even in August. The National Park Service recommends you dress in layers to provide flexibility. It can snow in the park in the summer in even the lower elevations. The normal Yellowstone high in August is upper 70s or high 80s with lows in the 40s or 50s. Pack a warm jacket, gloves and your rain gear during the summer. Bearman's Travel Guide reports that thunderstorms are common throughout [the] park in the afternoons in August.. Bring your insect repellent.