Average Temperatures for Philadelphia. Philadelphia's coldest month is January when the average temperature overnight is 25.5Â°F. In July, the warmest month, the average day time temperature rises to 85.5Â°F.The driest month in Philadelphia is February with 2.74 inches of precipitation, and with 4.39 inches July is the wettest month.n July, the warmest month, the average day time temperature rises to 85.5Â°F. The driest month in Philadelphia is February with 2.74 inches of precipitation, and with 4.39 inches July is the wettest month.
1 A data set has three quartiles: the lower quartile, the median of the data set, and the upper quartile. 2  Median: The median divides a data set into two equal parts. 3  Lower quartile: Median of the lower half of the data. 4  Upper quartile: Median of the upper half of the data.
1 The Lower Quartile Q1 is that number such that 25% of observations are less than it and 75% are larger, or to be more precise, at least 25% of the sorted values are less than or equal to Q 1 and at least 75% of the values are greater than or equal to Q 1.ote that the numbers 1, 2 are less than or equal to the lower quartile, while 2, 3, 4, 5, 6, 7 are larger than or equal to Q 1. Therefore, 2 out of 7 or 28% of values are less than or equal to Q 1 and 6 out of 7 = 85% are larger than Q 1.