National Capital Parks-East - Environmental Factors

National Capital Parks-East (NACE) occurs within the regional climate zone referred to as a Mild Temperate Rainy Climate based on the Koppen classification. There is no distinct dry season, summers are hot and winters are mild. Regional features that influence the climate here include the Chesapeake Bay and Atlantic Ocean to the east and the Appalachian Mountains to the west. The average daily temperature is approximately 55 degrees Fahrenheit (12.8 degrees Celsius). The average daily maximum temperature is approximately 67 degrees Fahrenheit (19.6 degrees Celsius) and the average daily minimum temperature is about 43 degrees Fahrenheit (5.9 degrees Celsius). However, temperatures have reached as high as 107 degrees Fahrenheit (41.6 degrees Celsius) and as low as -26 degrees Fahrenheit (-32.2 degrees Celsius). The warmest month is July and the coldest months are January and February. The wettest month is August and the driest is February. The average total annual rainfall is approximately 45 inches (114.4 cm). There is approximately a 30 percent probability of daily measurable precipitation.