1 calorie of heat is the amount needed to raise 1 gram of water 1 degree Centigrade. 1 calorie (cal) = 4.184 J. (The Calories in food ratings are actually kilocalories.) A BTU (British Thermal Unit) is the amount of heat necessary to raise one pound of water by 1 degree Farenheit (F). 1 British Thermal Unit (BTU) = 1055 J (The Mechanical Equivalent of Heat Relation) 1 BTU = 252 cal = 1.055 kJ.
San Antonio River Walk. A couple strolls along the River Walk. The San Antonio River Walk (also known as Paseo del RÃ­o or simply as the River Walk) is a network of walkways along the banks of the San Antonio River, one story beneath the streets of San Antonio, Texas, USA.
San Antonio: Annual Weather Averages. July is the hottest month in San Antonio with an average temperature of 25 Â°C (77 Â°F) and the coldest is January at 11 Â°C (52 Â°F) with the most daily sunshine hours at 10 in July. The wettest month is October with an average of 66mm of rain. The best month to swim in the sea is in August when the average sea temperature is 26 Â°C (79 Â°F).