Calculating QT interval duration Count the number of squares from the beginning of the QRS complex to the end of the T wave. Multiply this number by 0.04 second. The normal range is 0.36 to 0.44 second, or 9 to 11 small squares wide.alculating QT interval duration Count the number of squares from the beginning of the QRS complex to the end of the T wave. Multiply this number by 0.04 second. The normal range is 0.36 to 0.44 second, or 9 to 11 small squares wide.
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CLIMATE OVERVIEW. Walnut Creek, California, gets 23 inches of rain per year. The US average is 39. Snowfall is 0 inches. The average US city gets 26 inches of snow per year. The number of days with any measurable precipitation is 41. On average, there are 262 sunny days per year in Walnut Creek, California. The July high is around 86 degrees. The January low is 40. Sperling's comfort index for Walnut Creek is a 84 out of 100, where a higher score indicates a more comfortable year-around climate. The US average for the comfort index is 54.